Pressure drop of cable-in-conduit conductors with different void fraction (9999)
Bagnasco, M., Bottura, L., Bruzzone, P.), Lewandowska, M., Marinucci, C., Staehli, F.
First field test of FiDeL: The magnetic field description for the LHC (2009)
Bottura, L, Buzio, M, Catalan-Lasheras, N, Deniau, L, Di Castro, M, Fartoukh, S, ...
The start-up of the LHC has provided the first field test for the concept, functionality and accuracy of FiDeL, the Field Description for the LHC. FiDeL provides a parametric model of the transfer...
$J_{c}(B,T,\epsilov)$ Parameterization for the ITER Nb$_3$Sn Production (2009)
A number of models for the critical surface of Nb3Sn, and in general A15 superconductors, have been developed in the past years. This paper compares the most common parameterizations using consistent...
Test Results from the PF Conductor Insert Coil and Implications for the ITER PF System (2009)
Bessette, D, Bottura, L, Devred, A, Mitchell, N, Okuno, K, Nunoya, Y, ...
In this paper we report the main test results obtained on the Poloidal Field Conductor Insert coil (PFI) for the International Thermonuclear Experimental Reactor (ITER), built jointly by the EU and...
Comparing Thermal Stability of NbTi and Nb$_3$Sn Wires (2009)
Breschi, M, Trevisani, L, Bottura, L, Devred, A, Trillaud, F
The investigation of quenching in low temperature superconducting wires is of great relevance for a proper design of superconductive cables and magnets. This paper reports the experimental results of...
Preface to the special issue on low-T§c superconducting materials. (2009)
Cryogenics, 48(2008) S.281-82
Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets (2008)
Xydi, P, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, Miles, J, ...
One of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the...
Sammut, N J, Bottura, L, Deferne, G, Venturini-Delsolaro, W, Wolf, R
The allowed multipoles in the Large Hadron Collider (LHC) superconducting dipole magnets decay whilst on a constant current plateau. It is known that the decay amplitude is largely affected by the...
Sammut, N J, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, Miles, J, ...
In order to reduce the burden on the beam-based feedback, the Large Hadron Collider control system is equipped with the Field Description for the LHC (FiDeL) which provides a forecast of the magnetic...
Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets (2008)
Xydi, P, Sammut, N, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, ...
One of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the...
Sammut, N, Xydi, P, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, ...
In order to reduce the burden on the beam-based feedback, the Large Hadron Collider control system is equipped with the Field Description for the LHC (FiDeL) which provides a forecast of the magnetic...
Sammut, N, Bottura, L, Deferne, G, Venturini-Delsolaro, W, Wolf, R
The allowed multipoles in the Large Hadron Collider (LHC) superconducting dipole magnets decay whilst on a constant current plateau. It is known that the decay amplitude is largely affected by the...
Conceptual Design of Superferric Magnets for PS2 (2008)
Bottura, L, Karppinen, M, Kirby, G, MacCaferri, R, Maglioni, C, Parma, V, ...
We analyze feasibility and cost of a superferric magnet design for the PS2, the 50 GeV ring that should replace the PS in the CERN injector chain. Specifically, we provide the conceptual design of...
Fast Ramping Superconducting Magnet Design Issues for Future Injector Upgrades at CERN (2008)
Kirby, G A, Verweij, A, Bottura, L, Auchmann, B, Catalan-Lasheras, N
An upgrade of the LHC injection chain, and especially the sequence of PS and SPS, up to an extraction energy of 1Â TeV, is one of the steps considered to improve the performance of the whole...
Estimation of Mechanical Vibrations of the LHC Fast Magnetic Measurement System (2008)
Brooks, NR, Bottura, L, García-Pérez, J, Dunkel, O, Walckiers, L
Current installation of the Large Hadron Collider (LHC) particle accelerator at CERN has required the use of a harmonic coil magnetic measurement system to quantify the magnetic field harmonic...
Coupling Current and AC Loss in LHC Superconducting Quadrupoles (2008)
Di Castro, M, Bottura, L, Richter, D, Sanfilippo, S, Wolf, R
One of the issues for the operation of the LHC accelerator at CERN are the field errors generated by coupling currents in the superconducting cables of the main dipoles and quadrupoles, especially...
Stability Analysis of the LHC Cables for Transient Heat Depositions (2008)
Granieri, P P, Calvi, M, Xydi, P, Baudouy, B, Bocian, D, Bottura, L, ...
The commissioning and the exploitation of the LHC require a good knowledge of the stability margins of the superconducting magnets with respect to beam induced heat depositions. Previous studies...
Magnetic Performance of the Main Superconducting Magnets for the LHC (2008)
Sanfilippo, S, Sammut, N, Bottura, L, Di Castro, M, Basu, A, Koutchouk, JP, ...
The field strength and homogeneity of all the LHC superconducting magnets were measured as a part of the production control and qualification process that has taken place during the past four years....
Xydi, P, Sammut, N, Alemany-Fernandez, R, Bottura, L, Deferne, G, Lamont, M, ...
A dedicated measurement campaign was set up to test the FiDeL concept and its LSA implementation. The test was performed by demonstrating the tracking of B1 and B2 for two LHC main dipoles and one...
A Fast Digital Integrator for Magnetic Field Measurements at CERN (2008)
Arpaia, P, Bottura, L, Cimmino, P, Giloteaux, D, Masi, A, García-Pérez, J, ...
A self-calibrating digital instrument for flux measurements on magnets for accelerators used in basic research on subnuclear particles is proposed. The instrument acquires voltage arising from...
Arpaia, P, Bottura, L, Inglese, V, Spiezia, G
A new software platform named FFMM (Flexible Framework for Magnetic Measurements) is under development at CERN (European Organization for Nuclear Research) in cooperation with the University of...
Sammut, NJ, Benedico-Mora, E, Bottura, L, Galbraith, P, Giloteaux, D, Greco, G, ...
The decay and snapback of the magnetic field multipoles in superconducting particle accelerators like the Large Hadron Collider (LHC) could result in a significant particle beam loss unless...
Data Analysis of Transient Energy Releases in the LHC Superconducting Dipole Magnets (2008)
Calvi, M, Angrisani, L, Bottura, L, Di Castro, M, Masi, A, Siemko, A
Premature training quenches are caused by transient energy released within the LHC dipole magnet coils while it is energized. Voltage signals recorded across the magnet coils and on the so-called...
Bottura, L, Buzio, M, Pauletta, S, Smirnov, N
We review 19 measurement systems for the magnetic axis of accelerator magnets, used to align machine components. First, we provide some background information and we describe briefly the instruments...
A Software Framework for Flexible Magnetic Measurements at CERN (2008)
Arpaia, P, Bottura, L, Buzio, M, Della Ratta, D, Deniau, L, Inglese, V, ...
A statistical behavioral modeling approach for assessing dynamic metrological performance during the concept design of accurate digitizers is proposed. A surface-response approach based on...
Magnet Acceptance and Allocation at the LHC Magnet Evaluation Board (2008)
Bestmann, P, Bottura, L, Catalan-Lasheras, N, Fartoukh, S, Gilardoni, S, Giovannozzi, M, ...
The normal and superconducting magnets for the LHC ring have been carefully examined to insure that each of about 1900 assemblies is suitable for the operation in the accelerator. Hardware experts...
Quench analysis of the European high field superconducting dipole magnet EDIPO (2008)
Marinucci, C., Calvi, M., Bottura, L., Bruzzone, P., Herzog, R.
Pressure drop of cable-in-conduit conductors with different void fraction (2008)
Bagnasco, M., Bottura, L., Bruzzone, P., Lewandowska, M., Marinucci, C., Staehli, F.
Stability analysis of the LCH cables for transient heat depositions (2008)
Granieri, P.P., Calvi, M., Xydi, P., Bocian, D., Bottura, L., Breschi, M., ...
Conceptual design of superferric magnets for PS2 (2007)
Bottura, L, MacCaferri, R, Maglioni, C, Parma, V, De Rijk, G, Rossi, L, ...
We analyze feasibility and cost of a superferric magnet design for the PS2. Specifically, we provide the conceptual design of dipole and quadrupoles, including considerations on cryogenics and...
Calvi, M, Bottura, L, Rodríguez-Mateos, F
The commissioning of the Large Hadron Collider at CERN includes the powering of about 1600 superconducting electrical circuits to currents ranging from 55Â A to 11.8 kA. A large number of splices...
Performance Analysis of a Fast Digital Integrator for Magnetic Field Measurements at CERN (2007)
Arpaia, P, Bottura, L, Masi, A, Spiezia, G
A Fast Digital Integrator (FDI) has been designed at CERN for increasing performance of state-of-art instruments analyzing superconducting magnets in particle accelerators. In particular, in flux...
Pressure drop of cable-in-conduit conductors with different void fraction (2007)
Bagnasco, M., Bottura, L., Bruzzone, P., Lewandowska, M., Marinucci, C., Staehli, F.
Quench analysis of the EDIPO high field superconducting dipole magnet (2007)
Marinucci, C., Calvi, M., Bottura, L., Bruzzone, P., Herzog, R.
Stability analysis of the LCH cables for transient heat depositions (2007)
Granieri, P.P., Calvi, M., Xydi, P., Bocian, D., Bottura, L., Breschi, M., ...
Computations of AC loss in the ITER magnets, during fast field transients (2007)
Bottura, L., Bruzzone, P., Lister, J. B., Marinucci, C., Portone, A.
The calculation of AC loss due to the control currents in ITER is a cumbersome task. The reason is that control transients require small field changes (0.1 T or less) at moderate frequency (up to 10...
The field description for the large hardon collider (2006)
Sammut, N J, Micallef, J, Bottura, L
This thesis deals with the formulation of a static and dynamic field model as well as a set of scaling laws that together form the core of the feed-forward control system. This work also includes...
Sammut, N, Bottura, L, Micallef, J, Sanfilippo, S
The decay of the allowed multipoles in the Large Hadron Collider (LHC) dipoles is expected to perturb the beam stability during the particle injection. The decay amplitude is largely affected by the...
Measurement and Modeling of Magnetic Hysteresis in the LHC Superconducting Correctors (2006)
Venturini-Delsolaro, W, Bottura, L, Chaudhari, Y, Karppinen, M, Sammut, N
The Large Hadron Collider, now under construction at CERN, relies heavily on superconducting magnets for its optics layout: besides the main magnets, almost all the correcting magnets are...
The Field Description Model for the LHC Quadrupole Superconducting Magnets (2006)
Sammut, N, Bottura, L, Micallef, J, Sanfilippo, S
The LHC control system requires an accurate forecast of the magnetic field and the multipole field errors to reduce the burden on the beam-based feed-back. The Field Description for the LHC (FIDEL)...
Checking the Polarity of Superconducting Multipole LHC Magnets (2006)
Buzio, M, Bottura, L, Brun, G, Fievez, G, Galbraith, P, García-Pérez, J, ...
This paper describes the design and operation of the âﾜPolarity Checkerâ, a scanning probe designed to check multipole field order, type and polarity of superconducting LHC magnets. First...
Warm and Cold Magnetic and Mechanical Alignment Tests of LHC Short Straight Sections (2006)
Buzio, M, Beauquis, J, Bottura, L, Coccoli, M, Deferne, G, Krotov, N, ...
This paper contains a summary of the results of the magnetic and mechanical alignment tests performed at CERN on the first 111 arc Short Straight Sections. These include the mechanical axis of the...
Impact of the First Powering Cycles on the LHC Superconducting Dipole Coil Geometry (2006)
Calvi, M, Todesco, E, Bottura, L, Sanfilippo, S, Siemko, A
The impact of the first powering cycles on the LHC superconducting dipoles coil geometry has been investigated. Dedicated magnetic measurements have been performed to estimate the changes in the...
Focusing Strength Measurements of the Main Quadrupoles for the LHC (2006)
Smirnov, N, Bottura, L, Calvi, M, Deferne, G, Di Marco, J, Sammut, N, ...
More than 1100 quadrupole magnets of different types are needed for the Large Hadron Collider (LHC) which is in the construction stage at CERN. The most challenging parameter to measure on these...
Electrical and Magnetic Performance of the LHC Short Straight Sections (2006)
Sanfilippo, S, Beauquis, J, Bottura, L, Buzio, M, Coccoli, M, García-Pérez, J, ...
The Short Straight Section (SSS) for the Large Hadron Collider arcs, containing in a common cryostat the lattice quadrupoles and correction magnets, have now entered series production. The foremost...
Calvi, M, Agrisani, L, Bottura, L, Masi, A, Siemko, A
Premature training quenches are caused by transient energy released within the magnet coil while it is energized. Signals recorded across the so-called quench antenna carry information about these...
Hagen, P, Bottura, L, Calvi, M, Sanfilippo, S, Schirm, K, Todesco, E, ...
The main issues concerning the field quality in the main quadrupoles of the Large Hadron Collider are presented. We show the trend plots for the focusing strength and multipoles at room temperature...
Analytical Model of Thermo-electrical Behaviour in Superconducting Resistive Core Cables (2006)
Calvi, M, Bottura, L, Breschi, M, Coccoli, M, Granieri, P, Iriart, G, ...
High field superconducting Nb3Sn accelerators magnets above 14 T, for future High Energy Physics applications, call for improvements in the design of the protection system against resistive...
Computations of AC losses in the ITER magnetics during fast field transients (2006)
Bottura, L., Bruzzone, P., Lister, J.B., Marinucci, C., Portone, A.
Design and optimization of the 12.5 T EFDA dipole magnet (2006)
Portone, A., Salpietro, E., Bottura, L., Bruzzone, P., Della Corte, A., Fietz, W., ...
The aim of this paper is to provide an overview of a recent study carried out-within the framework of the European Fusion Program-to design a 12.5 T superconducting dipole. By focusing on the CICC...
Analysis of transverse heat transfer coefficient in CICC's with central cooling channel (2006)
Bottura, L., Bruzzone, P., Marinucci, C., Stepanov, B.
This paper describes a new method to determine the equivalent transverse heat transfer coefficient between the helium flow in the cable bundle and the flow in the central space of a CICC's with...
Conceptual design of the 12.5 T superconducting EFDA dipole. (2006)
Portone, A., Salpietro, E., Bottura, L., Bruzzone, P., Fietz, W.H., Heller, R., ...
IEEE Transactions on Applied Superconductivity, 16(2006) S.1312-15
Criteria for the numerical convergence of quench simulations in CICC'S. (2006)
Cryogenics, 46(2006) S.556-62
Design and optimization of the 12.5 T EFDA dipole magnet. (2006)
Portone, A., Salpietro, E., Bottura, L., Bruzzone, P., Della Corte, A., Fietz, W., ...
CHATS - Workshop on Computation of Thermo-hydraulic Transients in Superconductors, Technical University of Twente, Enschede, NL, June 26-29, 2005
Design and optimization of the 12.5 T EFDA dipole magnet. (2006)
Portone, A., Salpietro, E., Bottura, L., Bruzzone, P., Della Corte, A., Fietz, W., ...
Cryogenics, 46(2006) S.494-506
A Mathematical Formulation to Predict the Harmonics of the Superconducting LHC Magnets (2005)
Sammut, N, Bottura, L, Micallef, J
CERN is currently assembling the LHC (Large Hadron Collider) that will accelerate and bring in collision 7 Tev protons for high energy physics. Such a superconducting magnet-based accelerator can be...
Bellesia, B, Bottura, L, Granata, V, Le Naour, S, Oberli, L, Sanfilippo, S, ...
The production of more than 60% of superconducting cables for the main dipoles of the Large Hadron Collider has been completed. The results of the measurements of cable magnetization and the...
Sanfilippo, S, Bottura, L, Calvi, M, Chohan, V, Durante, M, Hagen, P, ...
The series testing at 1.9 K of the 360 Short Straight Sections (SSS) for the Large Hadron Collider have started at CERN in September 2003. The SSS contain the lattice quadrupoles and correction...
A Cable-in-Conduit Superconductor for Pulsed Accelerator Magnets (2005)
Bottura, L, Bruzzone, P, Fischer, E, Kauschke, M, Moritz, G, Vysotsky, V S, ...
Superconducting magnets for future accelerators such as the SIS-100 ring of the International Accelerator Facility at GSI-Darmstadt, or a superconducting injector at the LHC, require that the...
A Scaling Law for the Snapback in Superconducting Accelerator Magnets (2005)
Bottura, L, Ambrosio, G, Bauer, P, Haverkamp, M, Pieloni, T, Sanfilippo, S, ...
The decay of the sextupole component in the bending dipoles during injection and the subsequent snapback at the start of beam acceleration are issues of common concern for all superconducting...
Analytical & Numerical Modelings of Elliptical Superconducting Filament Magnetization (2005)
Bottura, L, Satiramatekul, T, Bouillault, F, Devred, Arnaud
This paper deals with the two-dimensional computation of magnetization in an elliptic superconducting filament by using numerical and analytical methods. The numerical results are obtained from the...
Bellesia, B., Bottura, L., Granata, V., Le Naour, S., Oberli, L., Sanfilippo, S., ...
The production of more than 60% of superconducting cables for the main dipoles of the Large Hadron Collider has been completed. The results of the measurements of cable magnetization and the...
Bellesia, B., Bottura, L., Granata, V., Le Naour, S., Oberli, L., Sanfilippo, S., ...
The production of more than 60% of superconducting cables for the main dipoles of the Large Hadron Collider has been completed. The results of the measurements of cable magnetization and the...
Design and optimization of the 12.5 T EFDA dipole magnet (2005)
Portone, A., Salpietro, E., Bottura, L., Bruzzone, P., Et Al.
The aim of this paper is to provide an overview of a recent study carried out—within the framework of the European Fusion Program—to design a 12.5 T superconducting dipole. By focusing on the...
Bellesia, B., Bottura, L., Granata, V., Le Naour, S., Oberli, L., Sanfilippo, S., ...
The production of more than 60% of superconducting cables for the main dipoles of the Large Hadron Collider has been completed. The results of the measurements of cable magnetization and the...
CHATS - Workshop on Computation of Thermo-hydraulic Transients in Superconductors, Technical University of Twente, Enschede, NL, June 26-29, 2005
Conceptual design of the 12.5 T superconducting EFDA dipole. (2005)
Portone, A., Bottura, L., Bruzzone, P., Fietz, W.H., Heller, R., Lucas, J., ...
19th Internat.Conf.on Magnet Technology (MT-19), Genova, I, September 18-23, 2005
A Scaling Law for Predicting Snap-Back in Superconducting Accelerator Magnets (2004)
Bottura, L, Pieloni, T, Sanfilippo, S, Ambrosio, G, Bauer, P, Haverkamp, M
The decay and snap-back of sextupole in the bending dipoles are issues of common concern, albeit at different levels of criticality, for all superconducting colliders built (Tevatron, HERA, RHIC) or...
A Strategy for Sampling the Field Quality of the LHC Dipoles (2004)
Bottura, L, Granata, V, Fartoukh, Stéphane David, Todesco, Ezio
We have measured the magnetic field of a large fraction of the LHC main dipoles, to date more than 400 in warm conditions and over 100 in cold conditions. Using the available data we analysed the...
Magnetic Field Tracking Experiments for LHC (2004)
Granata, V, Billan, J, Bordry, Frederick, Bottura, L, Coutinho-Ferreira, P M, Effinger, E, ...
At the Large Hadron Collider (LHC) at CERN one of the difficult requirements during the energy ramp is that the ratio between the field produced by the quadrupoles and the field in the dipoles...
Bottura, L, Buzio, M, Coccoli, M, Deferne, G, García-Pérez, J, Smirnov, N
Considerable effort is spent at CERN on magnetic alignment measurements of main lattice LHC dipoles, including field direction, curved axis shape and position of in-built correctors, essential to...
Steering field quality in the main dipole magnets of the Large Hadron Collider (2004)
Todesco, Ezio, Bellesia, B, Bottura, L, Devred, Arnaud, Remondino, Vittorio, Pauletta, S, ...
More than 10% of the collared coils of the main LHC dipoles have been produced. In this paper we compare the measured field quality to beam dynamics targets using correlations to measurements at...
Quench Performance and Field Quality of the LHC Preseries Superconducting Dipoles (2004)
Siemko, A, Berrig, O E, Bottura, L, Buzio, M, Chohan, V, Le Floc'h, E, ...
The preseries production of the LHC main superconducting dipoles is presently being tested at CERN. The foremost features of these magnets are: twin structure, six block two layer coils wound from...
Field Decay and Snapback Measurements Using a Fast Hall Probe Sensor (2004)
Pieloni, T, Sanfilippo, S, Bottura, L, Haverkamp, M, Tikhov, A, Effinger, E, ...
During beam injection the components of the magnetic field inside the magnets decay in time. At the re-start of the ramping, this decay is cancelled resulting in a fast change of the harmonics called...
High field accelerator magnet R&D in Europe (2004)
Devred, Arnaud, Baynham, D Elwyn, Bottura, L, Chorowski, M, Fabbricatore, P, Leroy, D, ...
The LHC magnet R&D program has shown that the limit of NbTi technology at 1.9 K was in the 10-to-10.5-T range. Hence, to go beyond the 10-T threshold, it is necessary to change the superconducting...
Quench Induced Pressure Rise in the Cooling Pipes of the Atlas Barrel Toroid Model (2004)
Haug, F, Bottura, L, Broggi, F, Junker, S
The ATLAS superconducting magnet system consists of a Barrel Toroid, two End-Cap Toroids and a Solenoid. Eight individual racetrack coils will be assembled to form the Barrel Toroid with overall...
Analysis of Current Redistribution in a CICC under Transient Heat Pulses (2004)
Bottura, L, Bruzzone, P L, Marinucci, C
We have performed experiments and simulations of the current distribution process in a CICC with the aim to understand better the coupled thermal, hydraulic and electric process that leads to a...
High field accelerator magnet R&D in Europe (2004)
Devred, A., Baynham, D., Bottura, L., Chorowski, M., Fabbricatore, P., Leroy, D., ...
The LHC magnet R&D Program has shown that the limit of NbTi technology at 1.8 K was in the range 10 to 10.5 T. Hence, to go beyond the 10-T threshold, it is necessary to change of superconducting...
Analysis and interpretation of T-cs tests of the ITER Toroidal Field Conductor Insert (2004)
Marinucci, C., Bottura, L., Bruzzone, P., Mitchell, N., Stepanov, B., Wesche, R.
The toroidal Field Conductor Insert (TFCI) coil was tested at 46 kA in the 13 T background magnetic field generated by the Central Solenoid Model Coil. The single layer TFCI coil uses a Nb3Sn...
Decay and Snapback in Superconducting Accelerator Magnets (2003)
This thesis deals with the explanation and compensation of the effects 'decay' and 'snapback' in superconducting accelerator magnets, in particular in those used in the new Large Hardron Collider at...
Controlling Field Quality in Magnet Production (2003)
Scandale, Walter, Bottura, L, Devred, Arnaud, Remondino, Vittorio, Sanfilippo, S, Todesco, Ezio, ...
The field quality measurements at room temperature of around 100 collared coils of the main LHC dipoles are analysed. Using correlations to field measurements at 1.9 K, comparison with beam dynamics...
Measuring system qualification for LHC arc quadrupole magnets (2003)
Currently the LHC Project at CERN has reached the construction phase. The superconducting magnets of this new accelerator work at superfluid helium temperature. The "arc quadrupoles" (360 pieces),...
An Estimate of Multipolar Errors in the LHC Dipoles (2003)
Todesco, Ezio, Bottura, L, Remondino, Vittorio, Sanfilippo, S, Scandale, Walter
Magnetic measurements of 60 collared coils and of 14 cryomagnets are available for the LHC dipoles. These data are used to work out an estimate of the systematic and random components of the field...
Performance of the First LHC Pre-series Superconducting Dipoles (2003)
Bottura, L, Leroy, D, Modena, M, Pojer, M, Pugnat, P, Rossi, L, ...
Within the LHC magnet program, a preseries production of final design, full-scale superconducting dipoles has presently started in industry and magnets are being tested at CERN. The main features of...
Persistent and Coupling Current Effects in the LHC Superconducting Dipoles (2003)
Amet, S, Bottura, L, Granata, V, Le Naour, S, Mishra, R K, Oberli, L R, ...
One of the main issues for the operation of the LHC accelerator at CERN is the field errors generated by persistent and coupling currents in the main dipoles at injection conditions, i.e., 0.54Â T...
Analytical Calculation of Current Distribution in Multistrand Superconducting Cables (2003)
Bottura, L, Breschi, M, Fabbri, M G
In recent years the problem of current distribution in multistrand superconducting cables has received increasing attention for large scale superconductivity applications due to its effect on the...
Analysis of Electrical Coupling Parameters in Superconducting Cables (2003)
Bottura, L, Breschi, M, Rosso, C
The analysis of current distribution and redistribution in superconducting cables requires the knowledge of the electric coupling among strands, and in particular the interstrand resistance and...
Flower, a Model for the Analysis of Hydraulic Networks and Processes (2003)
We have developed in the past years a model that describes hydraulic networks that are typical of the cryogenic interconnection of superconducting magnets. The original model, called Flower, was used...
An Analytical Benchmark for the Calculation of Current Distribution in Superconducting Cables (2003)
Bottura, L, Breschi, M, Fabbri, M G
The validation of numerical codes for the calculation of current distribution and AC loss in superconducting cables versus experimental results is essential, but could be affected by approximations...
Analysis and interpretation of Tcs tests of the ITER toroidal field conductor insert (2003)
Marinucci, C., Bottura, L., Bruzzone, P., Mitchell, N., Stepanov, B., Wesche, R.
Analysis of the measurement of the current sharing temperature in the ITER TF model coil (2003)
Marinucci, C., Bottura, L., Bruzzone, P.
The ITER toroidal field model coil (TFMC) has been tested in the TOSKA facility of FzK. The racetrack coil, which uses a circular Nb3Sn cable-in-conduit conductor, is equipped with external resistive...
The measurement of the magnetic field is often the final verification of the complex design and fabrication process of a magnetic system. In several cases, when seeking high accuracy, the measurement...
Analytical Solution for the Current Distribution in Multistrand Superconducting Cables (2002)
Bottura, L, Breschi, M, Fabbri, M G
Current distribution in multistrand superconducting cables can be a major concern for stability in superconducting magnets and for field quality in particle accelerator magnets. In this paper we...
Status Report on Field Quality in the Main LHC Dipoles (2002)
Bottura, L, Pauletta, S, Remondino, Vittorio, Sanfilippo, S, Scandale, Walter, Todesco, Ezio
We give the present status of the field quality in the main LHC dipoles. Special emphasis is given to the collared coil data: a few tens of coils have been built, allowing a first analysis of the...
Bottura, L, Redaelli, S, Remondino, Vittorio, Sanfilippo, S, Savary, F, Scandale, Walter, ...
In this paper we discuss even multipolar components of the Large Hadron Collider dipole in relation to the manufacturing features and target values required by beam dynamics. Due to the two-in-one...
Field quality of the LHC dipole magnets in operating conditions (2002)
Bottura, L, Buzio, M, Fartoukh, Stéphane David, Russenschuck, Stephan, Sanfilippo, S, Scandale, Walter, ...
We report here the main results of the field measurements performed so far on the pre-series LHC superconducting dipoles at superfluid helium temperature. After discussing the results at injection...
First Results and Status of the LHC Test String 2 (2002)
Saban, R I, Ballarino, A, Blanco-Viñuela, E, Bordry, Frederick, Bottura, L, Bozzini, D, ...
After the commissioning of String 2 Phase1 and the powering of the main circuits in autumn 2001, a short yet vigorous experimental program was carried-out to validate the final design choices for the...
Field Quality of the Short Superconducting Dipole Models for the LHC (2002)
Ang, Z, Bottura, L, Sanfilippo, S, Siemko, A, Tommasini, D, Venturini-Delsolaro, W, ...
A full characterization of the magnetic field in warm and cold conditions was performed as a part of the standard test on the LHC 1-m long superconducting dipole models. Furthermore, dedicated...
Application of the Code THEA to the CONDOPT Experiment in SULTAN (2002)
Bottura, L, Bruzzone, P L, Marinucci, C
The CONDOPT (CONDuctor OPTimization) experiment has been recently completed in SULTAN. The current sharing behaviour of Nb3Sn samples was assessed as a function of the number of cyclic loads...
Transient Stability Analysis of the SeCRETS Experiment in SULTAN (2002)
Bottura, L, Bruzzone, P L, Marinucci, C
We present here the results of the analysis of the stability experiment SeCRETS, performed on two Nb3Sn cable-in-conduit conductors with the same amount of total copper stabilizer, but different...
Degaussing and Decay Reduction in the Short Superconducting Dipole Models for the LHC (2002)
Bottura, L, Venturini-Delsolaro, W, Haverkamp, M, Kuijper, A
The time decay of field harmonics during current plateaus is a known drawback of superconducting accelerator magnets. The present understanding of this phenomenon refers to a combination of flux...
A System for Series Magnetic Measurements of the LHC Main Quadrupoles (2002)
Smirnov, N, Bottura, L, Chiusano, F, Dunkel, O, Legrand, P, Schloss, S, ...
More than 400 twin aperture lattice quadrupoles are needed for the Large Hadron Collider (LHC) which is under construction at CERN. The main quadrupole is assembled with correction magnets in a...
Loss and Dynamic Magnetic Field Measurements in LHC Dipoles (2002)
Akhmedov, A A, Amet, S, Balaazi, I, Bottura, L, Gateau, M, Pugnat, P, ...
Knowledge of AC loss and dynamic magnetic field distortion in the main LHC dipoles is both important for the assessment of the accelerator performance and providing insight into the properties of...
The Multipoles Factory: An Element of the LHC Control (2002)
Amet, S, Bottura, L, Deniau, L, Walckiers, L
The measurements performed at CERN on prototypes and first pre-series main dipole magnets confirm the need of an active control of the Large Hadron Collider to compensate the dynamic field changes...
Magnetic Measurement of Alignment of Main LHC Dipoles and Associated Correctors (2002)
Bottura, L, Buzio, M, Deferne, G, Schnizer, P, Sievers, P, Smirnov, N
We discuss the method developed for the verification of alignment of magnetic elements contained in the LHC cryodipole cold mass during series tests at CERN. First, we outline motivations and...
Performance of the LHC Final Prototype and First Pre-series Superconducting Dipole Magnets (2002)
Bottura, L, D'Angelo, G, Gateau, M, Legrand, P, Modena, M, Naoui, K, ...
Within the LHC cryo-dipole program, six full-scale superconducting prototypes of final design were built in collaboration between Industry and CERN, followed by launching the manufacture of...
A Tool for Simulating Rotating Coil Magnetometers (2002)
Bottura, L, Buzio, M, Schnizer, P, Smirnov, N
When investigating the quality of a magnetic measurement system, one observes difficulties to identify the "trouble maker" of such a system as different effects can yield similar influences on the...
Aleksa, Martin, Amet, S, Ang, Z, Bottura, L, Buzio, M, Ferracin, P, ...
We report the main results of the magnetic field measurements performed on the full-size LHC superconducting dipoles tested at CERN since summer 1998. Main field strength and field errors are...
Field Decay and Snapback Measurements using a Fast Hall Plate Detector (2002)
Benedico, E, Bottura, L, Haverkamp, M, Ten Haken, B, Sanfilippo, S
In superconducting particle accelerators significant changes occur in tune and chromaticity during the injection of particles and their subsequent acceleration. This behavior is caused by the decay...
Bottura, L, Haverkamp, M, Ten Haken, B
In many applications of superconductivity the magnetization of a saturated cylindrical superconducting filament is perturbed by an external field change. Especially in superconducting accelerator...
Transient stability analysis of the SeCRETS experiment in SULTAN (2002)
Marinucci, C., Bottura, L., Bruzzone, P.
We present here the results of the analysis of the stability experiment SeCRETS, performed on two Nb3Sn cable-in-conduit conductors with the same amount of total copper stabilizer, but different...
Application of the code THEA to the CONDOPT experiment in SULTAN (2002)
Bottura, L., Marinucci, C., Bruzzone, P.
The CONDOPT (CONDuctor OPTimization) experiment has been recently completed in SULTAN. The current sharing behavior of Nb-3 Sn samples was assessed as a function of the number of cyclic loads...
The Test Facility for the Short Prototypes of the LHC Superconducting Magnets (2001)
Arn, A, Bottura, L, Giloux, C, Mompo, R, Siemko, A, Venturini-Delsolaro, W, ...
The LHC development program relies on cryogenic tests of prototype and model magnets. This vigorous program is pursued in a dedicated test facility based on several vertical cryostats working at...
Modena, M, Bajko, M, Bottura, L, Buzio, M, Fessia, P, Pagano, O, ...
The LHC, a 7 TeV proton collider presently under construction at CERN, requires 1232 superconducting dipole magnets, featuring a nominal field of 8.33 T inside a cold bore tube of 50 mm inner...
Measurements of Magnetic Field Pattern in a Short LHC Dipole Model (2001)
Bottura, L, Breschi, M, Schneider, M
The magnetic field in superconducting accelerator magnets has a fine structure with longitudinal periodicity. This periodic pattern, with period identical to the cable twist pitch, is originated by...
Performance of the LHC Final Design, Full-Scale Superconducting Dipole Prototypes (2001)
Bottura, L, Pugnat, P, Siemko, A, Vlogaert, J, Wyss, C
Within the LHC magnet program, a series of six, final design, full-scale superconducting dipole prototypes are presently being built in industry and tested at CERN. The main features of these magnets...
Interaction between Current Imbalance and Magnetization in LHC Cables (2001)
Bottura, L, Haverkamp, M, Kuijper, A, Den Ouden, A, Ten Haken, B
The quality of the magnetic field in superconducting accelerator magnets is associated with the properties of the superconducting cable. Current imbalances due to coupling currents DI, as large as...
A General Model for Thermal, Hydraulic and Electric Analysis of Superconducting Cables (2001)
Bottura, L, Breschi, M, Rosso, C
In this paper we describe a generic, multi-component and multi-channel model for the analysis of superconducting cables. The aim of the model is to treat in a general and consistent manner...
Interaction between current imbalance and magnetization in LHC cables (2001)
Haverkamp, M., Kuijper, A., Ouden Den, A., Haken Ten, B., Bottura, L.
The quality of the magnetic field in superconducting accelerator magnets is associated with the properties of the superconducting cable. Current imbalances due to coupling currents ¿I, as large as...
Performance of the 1-m Model of the 6 kA Superconducting Quadrupole for the LHC Insertions (2000)
Lucas, J, Bottura, L, Dariol, H, Ostojic, R, Sanfilippo, S, Siemko, A, ...
The LHC dispersion suppressors and matching sections will be equipped with individually powered superconducting quadrupoles with an aperture of 56 mm. In order to minimise the cost of the powering...
Performance of Series-Design Prototype Main Quadrupoles for the LHC (2000)
Billan, J, Bottura, L, Peyrot, M, Remondino, Vittorio, Rifflet, J M, Siemko, A, ...
After the successful construction of two first-generation prototypes of the main quadrupoles for the LHC, three series-design prototypes have been further manufactured at CEA-Saclay. Together with...
Manufacture and Performance of the LHC Main Dipole Final Prototypes (2000)
Modena, M, Artoos, K, Bajko, M, Bottura, L, Buzio, M, Fessia, P, ...
This paper reports about the program of six LHC main dipole final prototypes. This program, launched in summer 1998, relies on industrially manufactured collared coils and cold masses assembled at...
Bottura, L, Buzio, M, Schnizer, P, Smirnov, N, Walckiers, L
Beam optics of the LHC accelerator require stringent control of the field quality of the main dipole and quadrupole magnets. The field quality measurements need challenging accuracy given the small...
Structural behaviour and magnetic field errors in a short model dipole magnet for the LHC (2000)
Bottura, L, Ferracin, P, Russenschuck, Stephan, Tommasini, D
Two-channel analysis of QUELL experimental results (2000)
Bottura, L., Marinucci, C., Rosso, C.
We have improved the model presently used in the thermo-hydraulic code Gandalf, adapting it to cable-in-conduit conductors with central cooling channel such as those developed for the model coils of...
Further Development of the Sextupole Dipole Corrector (MSCB) Magnet for the LHC (1999)
Ang, Z, Arshad, S A, Bajko, M, Bottura, L, Coxill, D, Giloux, C, ...
Combined sextupole-dipole corrector magnets (MSCB) will be mounted in each half cell of the new Large Hadron Collider (LHC) being built at CERN. The dipole part, used for particle orbit corrections,...
Coil Size and Geometric Field Quality in Short Model Dipoles for LHC (1999)
Ang, Z, Bottura, L, Russenschuck, Stephan, Siemko, A, Tommasini, D, Walckiers, L
We have measured the magnetic field at room temperature and at 1.8 K on more than twenty, 1-m long, single aperture LHC superconducting dipole models. The magnets feature either a 5-block coil...
Twin Rotating Coils for Cold Magnetic Measurements of 15 m Long LHC Dipoles (1999)
Billan, J, Bottura, L, Buzio, M, D'Angelo, G, Deferne, G, Dunkel, O, ...
We describe here a new harmonic coil system for the field measurement of the superconducting, twin aperture LHC dipoles and the associated corrector magnets. Besides field measurements the system can...
Status of the Short Dipole Model Program for the LHC (1999)
Artoos, K, Bottura, L, Fessia, P, Perini, D, Sanfilippo, S, Siegel, N, ...
The model program for the LHC main dipoles is dedicated to the study and validation of design variants and assembly parameters to achieve reproducible performance and optimise components and assembly...
A Fast Sextupole Probe for Snapback Measurement in the LHC Dipoles (1999)
Bottura, L, Larsson, L, Schloss, S, Schneider, M, Smirnov, N, Haverkamp, M
In superconducting particle accelerators a fast change of the magnetic field occurs during the first few seconds after the start of an energy ramp. Standard magnetic measurements using a coil...
A Mole for Warm Magnetic and Optical Measurements of LHC Dipoles (1999)
Bottura, L, Buzio, M, Deferne, G, Glöckner, C, Jansen, H, Köster, A, ...
A new rotating coil probe (a mole) has been developed for the simultaneous measurement of the magnetic field and magnetic axis of warm superconducting LHC dipoles and associated corrector windings....
A Practical Fit for the Critical Surface of NbTi (1999)
Known expressions for the critical temperature, critical field and Pinning force in NbTi are combined into a self-consistent fit formula that provides the critical current density as a function of...
Artoos, K, Bottura, L, Fessia, P, Bajko, M, Modena, M, Pagano, O, ...
This paper reports about the program of six LHC superconducting main dipole final prototypes and the steps towards series manufacture. The above program, launched in summer 1998, relies on collared...
Studies of Decay and Snapback Effects on LHC Dipole Magnets (1999)
Haverkamp, M, Bottura, L, Schneider, M
LHC model magnets have dynamic field imperfections of various nature. Two effects of particular importance are field component decay during injection and ''snapback'' during the first few seconds of...
The hydraulic solver Flower and its validation against the QUELL experiment in SULTAN (1999)
Knowledge of the hydraulic boundary conditions is a prerequisite for accurate estimates of the quench characteristics of superconducting magnets. A set of routines (Flower) has been designed and...
Boschmann, H, Bottura, L, Dubbeldam, R L, Kirby, G A, Lucas, J, Ostojic, R, ...
Two identical single aperture 1-metre superconducting dipoles have been built in collaboration with HMA Power Systems and tested at CERN. The 87.8 mm aperture magnets feature a single layer coil...
Bottura, L, Giloux, C, Kirby, G A, Lamm, M J, Milward, S R, Ostojic, R, ...
Following the successful testing of the first 1-metre model of the 70 mm aperture quadrupole for the LHC low-beta insertions, two further 1-metre magnets have been built. All magnets feature a...
Billan, J, Bóna, M, Bottura, L, Leroy, D, Pagano, O, Perin, R, ...
With the first test of the first full scale prototype in June-July 1998, the R&D on the long superconducting dipoles based on the LHC design of 1993-95 has come to an end. This second generation of...
Measurement of AC Loss and Magnetic Field during Ramps in the LHC Model Dipoles (1998)
Ang, Z, Bejar, I, Bottura, L, Richter, D, Sheehan, M, Walckiers, L, ...
We describe the systems for AC loss and magnetic field measurements developed for the LHC superconducting magnets. AC loss measurements are performed using an electric method, while field...
Magnetic Performance of First low-$\beta$ dipole corrector prototype, MCBX (1998)
Ang, Z, Bottura, L, Ijspeert, Albert, Hauge, N, Karppinen, M, Nielsen, B R, ...
The LHC low-beta triplets require a short and strong dipole corrector. The MCBX is a superconducting single aperture magnet, which features a horizontal dipole nested inside a vertical dipole. The...
Billan, J, Bóna, M, Bottura, L, Pagano, O, Perin, R, Perinet-Marquet, J L, ...
This paper reports about the 10-m-long models and one 15-m-long prototype. Their main design features are a 5-block coil cross section, an intra-beam distance of 194 mm at room temperature and a...
Measurements of the LHC Corrector Magnets at Room and Cryogenic Temperatures (1998)
Ang, Z, Arn, A, Bottura, L, Giloux, C, Sievers, P, Smirnov, N, ...
The superconducting twin aperture main dipole magnets of the LHC accelerator are equipped with pairs of sextupole and decapole correctors at their ends. Similarly, octupole correctors are aligned at...
Bottura, L, Pagano, O, Perin, R, Perini, D, Savary, F, Siemko, A, ...
A number of twin aperture, 10 m long, model dipole magnets for the LHC Project have been built and tested. With regard to the models of the first generation, the inner coil diameter and the...
LHC main dipoles proposed baseline current ramping (1998)
Several studies performed from 1994 to 1996 including some in the framework of the Dynamic Effects Working Group, have shown that the magnitude of the magnetic field imperfections generated in the...
Magnetic Field Quality of Short Superconducting Dipole Model Magnets for LHC (1998)
Ang, Z, Bottura, L, Tommasini, D, Walckiers, L
A series of 1-m long, 56 mm aperture dipole models has been built and tested at CERN within the scope of the R&D program for LHC. Here we report a summary of results of warm and cold steady state...
Cable Magnetization Effects in the LHC Main Dipole Magnets (1998)
Bottura, L, Schneider, M, Walckiers, L, Wolf, R
Several short (1 m) and long (10 m) dipole models have been tested within the scope of the on-going R&D programme for LHC at CERN. We report here the results of measurements of field quality in these...
The QUELL experiment as a validation tool for the numerical code Gandalf (1998)
Marinucci, C., Bottura, L., Vecsey, G., Zanino, R.
One goal of the QUELL experiment is the validation of numerical codes for the simulation of thermo-hydraulic transients in Cable-in-Conduit Conductors with Central Channel (C-5). The validation of...
Dynamic Effects and their Control at the LHC (1997)
Bailey, R, Bordry, Frederick, Bottura, L, Burla, P, Collier, Paul, Henrichsen, K N, ...
Tune, chromaticity and orbit of the LHC beams have to be precisely controlled by synchronising the magnetic field of quadrupole, sextupole and corrector magnets.This is a challenging task for an...
Performance of the quench detection system for ITER (1997)
Marinucci, C., Bottura, L., Pourrahimi, S., Zhelamskij, M.
The purpose of this study is to assess the expected response of conventional and non-conventional quench detection sensors proposed for the ITER coils. The assessment is based on simulation of...
Experimental Evidence of Boundary Induced Coupling Currents in LHC Prototypes (1996)
Bottura, L, Walckiers, L, Ang, Z
The field quality of 10 m long LHC dipole models has been measured with short rotating coils to explore its dependence on time and position. Multipoles exhibit a longitudinal periodic variation, with...
Field Errors Decay and "Snap-Back" in LHC Model Dipoles (1996)
Bottura, L, Walckiers, L, Wolf, R
The magnetic field in accelerator magnets decays when the current is kept constant during the particles injection phase, and returns quickly (snaps back) to the original values as soon as ramping is...
The 1 m long single aperture dipole coil test program for LHC (1996)
Andreyev, N I, Artoos, K, Bottura, L, Kirby, G A, Leroy, D, Oberli, L R, ...
Parametric study on coupling loss in subsize ITER Nb3Sn cabled specimen (1996)
Nijhuis, A., Bruzzone, P., Bottura, L.
The cable in conduit conductors for the various ITER coils are required to function under pulse conditions and fields up to 13 T. A parametric study, restricted to a limited variation of the...
Nijhuis, A., Bruzzone, P., Bottura, L.
The cable in conduit conductor for the ITER coils is required to function under pulse conditions and fields up to 13 T. A parametric study, restricted to a limited variation of the reference cable...
The ITER quench experiment on long length at the SULTAN facility (1995)
Anghel, A., Marinucci, C., Vecsey, G., Takahashi, Y., Schultz, J., Bottura, L.
A first characterization of the quench detection system for ITER (1995)
Marinucci, C., Bottura, L., Pourrahimi, S.
The purpose of this paper is to assess the expected response of conventional and non-conventional quench detection sensors proposed for the ITER coils, and to be tested in the QUELL experiment in...
Blau, B., Rohleder, I., Vecsey, G., Bottura, L., Bruzzone, P., Katheder, H.
The coupling current-losses of a full size, fusion dedicated Nb3Sn cable-in-conduit superconductor are measured as a function of the transverse load in the SULTAN III test facility. Applying a broad...
Blau, B., Rohleder, I., Vecsey, G., Bottura, L., Bruzzone, P., Katheder, H.
The coupling current-losses of a full size, fusion dedicated Nb3Sn cable-in-conduit superconductor are measured as a function of the transverse load in the SULTAN III test facility. Applying a broad...
An analysis of disruption events in ASDEX-upgrade through 3-D eddy current simulation. (1993)
Chiocchio, S., Bottura, L., Boccaccini, L.V., Gruber, O.
Ferro, C. [Hrsg.]
Eddy current codes validation against electromagnetic transients in ASDEX-upgrade. (1993)
Bottura, L., Albanese, R., Boccaccini, L.V., Fresa, R., Gernhardt, J., Gruber, O., ...
Ferro, C. [Hrsg.]
Electromagnetic effects on first wall and structural components. (1992)
Miya, K., Crutzen, Y.R., Takagi, T., Boccaccini, L.V., Bottura, L.
Proc.of the 2nd Internat.Symp.on Fusion Nuclear Technology, Karlsruhe, June 2-7, 1991 Part A