A Storage Ring based Option for the LHeC (2008)
Willeke, F, Bordry, Frederick, Braun, H H, Brüning, Oliver Simon, Burkhardt, H, Chattopadhyay, S, ...
The LHeC aims at the generation of hadron-lepton collisions with center of mass energies in the TeV scale and luminosities of the order of $10^{32}-10^{33} cm^{-2} sec^{-1}$ by taking advantage of...
Linac-LHC EP Collider Options (2008)
Zimmermann, F, Aksahal, H, Bordry, Frederick, Braun, H H, Brüning, Oliver Simon, Çiftçi, A K, ...
We describe various parameter scenarios for a ring-linac ep collider based on LHC and an independent electron linac. Luminosities between $10^{31}$ and $10^{33} cm^{-2}s^{-1}$ can be achieved with a...
Borgnolutti, F, Brüning, Oliver Simon, Dorda, U, Fartoukh, S, Giovannozzi, M, Herr, Werner, ...
In the framework of the studies for the upgrade of the insertions of the CERN Large Hadron Collider, four optical layouts were proposed with the aim of reducing the beta-function at the collision...
Brüning, Oliver Simon, De Maria, R, Ostojic, R
The paper presents three different layout and optics solutions for the upgrade of LHC insertions using Nb-Ti superconducting quadrupoles. Each solution is the outcome of different driving design...
LHC IR Upgrade: A Dipole First Option with Local Chromaticity Correction (2006)
De Maria, Riccardo, Brüning, Oliver Simon, Raimondi, Pantaleo
In the framework of the LHC Luminosity Upgrade, we develop a new layout of the interaction region (IR) with b* equal to 25cm in which the combination-separation dipoles come first with respect to the...
Brüning, Oliver Simon, De Maria, Riccardo
The paper presents a triplet layout option with long (about 100m total triplet length), low gradient (45T/m to 70T/m) quadrupole magnets. Assuming a maximum magnet diameter of 200mm, the peak coil...
Procedures and accuracy estimates for beta-beat correction in the LHC (2006)
Tomás, R, Brüning, Oliver Simon, Calaga, R, Fartoukh, Stéphane David, Franchi, A, Giovannozzi, Massimo, ...
The LHC aperture imposes a tight tolerance of 20% on the maximum acceptable beta-beat in the machine. An accurate knowledge of the transfer functions for the individually powered insertion...
A Staged Approach to LHC Commissioning (2006)
Lamont, M, Bailey, R, Brüning, Oliver Simon, Collier, P, Lauckner, R, Schmidt, R
Effective commissioning of the LHC with beam will demand very good preparation; all concerned subsystems will need to be well-prepared and thoroughly tested before first beam. To clarify the demands...
LHC Progress and Commissioning Plans (2006)
The LHC at CERN is in its final installation phase and hardware commissioning has started in 2006. The commissioning of the machine with beam is planned for summer 2007. The paper summarizes the...
Optics Flexibility and Matching at LHC Injection (2005)
Burkhardt, Helmut, Brüning, Oliver Simon, Goddard, Brennan, Kain, Verena, Mertens, Volker, Risselada, Thys, ...
An excellent match between the SPS, the several kilometres long transfer lines and the LHC will be required to minimise emittance blow-up at injection. Several optics changes in the SPS and the LHC...
Brüning, Oliver Simon, Devred, Arnaud, Ostojic, R, Rossi, L, Ruggiero, F, Scandale, Walter, ...
We investigate the maximum LHC performance for a standard IR design based on classical NbTi insertion magnets. We include in our analysis a ternary Nb-based ductile allow such as NbTi(Ta), a less...
Brüning, Oliver Simon, Fartoukh, Stéphane David, Lombardi, A M, Risselada, Thys, Schmidt, F, Verdier, A
The systematic dodecapole component in the Main Quadrupoles of the LHC lattice has a strong influence on the machine dynamic aperture at injection. In this paper we quantify this effect with the help...
An Improved Cllimation System for the LHC (2004)
Assmann, R W, Aberle, O, Bertarelli, A, Braun, H, Brugger, M, Brüning, Oliver Simon, ...
The handling of the high-intensity LHC beams in a super-conducting environment requires a high-robustness collimation system with unprecedented cleaning efficiency. For gap closures down to 2.2 mm no...
The New Layout of the LHC Cleaning Insertions (2004)
Assmann, R W, Aberle, O, Brüning, Oliver Simon, Chemli, S, Gasser, D, Jeanneret, J B, ...
The improved LHC collimation system required significant changes in the layout and design of the warm insertions. Requirements for collimation, optics, impedance, vacuum, and additional...
Brüning, Oliver Simon, Fartoukh, Stéphane David, Giovannozzi, Massimo, Risselada, Thys, Schmidt, F
A wide range of magnets, both warm and superconducting, will be used in the LHC. In addition to main dipoles, quadrupoles are used to focus the beam in regular arcs. Special dipoles separate or merge...
The Expected Performance of the LHC Injection Protection System (2004)
Kain, V, Brüning, Oliver Simon, Ducimetière, L, Goddard, B, Lamont, M, Mertens, V
The passive protection devices TDI, TCDD and TCLI are required to prevent damage to the LHC in case of serious injection failures, in particular of the MKI injection kicker. A detailed particle...
The AB-LHC Technical Review - November 2003 (2004)
Albert, M, Arduini, Gianluigi, Bailey, R, Brüning, Oliver Simon, Collier, Paul, Hanke, K, ...
The AB-LTC review was held over 3 days and five open sessions in November 2003. It was designed to cover all technical sub-projects of the LHC under the authority of the AB department. There had been...
Kashikhin, V V, Brüning, Oliver Simon, Mokhov, N V, Rakhno, I L, Ruggiero, F, Strait, J B, ...
Interaction region inner triplets are among the systems which may limit the LHC performance. An option for a new higher luminosity IR is a double-bore inner triplet with separation dipoles placed in...
Technological challenges for the LHC (2003)
Brüning, Oliver Simon, Rossi, Lucio, Lebrun, Philippe, Bordry, Frederick, Mess, Karl Hubert, Schmidt, Rüdiger
For the LHC to provide particle physics with proton-proton collisions at the centre of mass energy of 14 TeV with a luminosity of 1034 cm-2s-1, the machine will operate with high-field dipole magnets...
LHC Luminosity and energy upgrade: A Feasibility Study (2003)
Brüning, Oliver Simon, Cappi, R, Garoby, R, Gröbner, Oswald, Herr, Werner, Linnecar, Trevor Paul R, ...
We discuss a possible staged upgrade of the LHC and of its injectors, with a view to increasing the luminosity from the nominal 10**34 cm**-2s**-1 to 10**35 cm**-2s**-1 in each of the two...
Chromaticity Measurements via RF Phase Modulation and Continuous Tune Tracking (2002)
Brüning, Oliver Simon, Höfle, Wolfgang, Jones, R, Linnecar, Trevor Paul R, Schmickler, Hermann
Chromaticity diagnostics with high time resolution is of paramount importance for the control of the dynamic events in various accelerators, in particular for the LHC collider. This paper describes...
Field Quality vs Beam Based Corrections in Large Hadron Colliders (2002)
After summarising the main types of field errors in superconducting magnets the paper discusses limits for correcting the magnet field quality via dedicated correction circuits in a collider storage...
The LHC machine-experiment interface (2002)
Tapprogge, Stefan, Tsesmelis, Emmanuel, Brüning, Oliver Simon
This series of three lectures will provide an overview of issues arising at the interface between the LHC machine and the experiments, which are required for guiding the interaction between the...
Field Quality Specification for the LHC Main Dipole Magnets (2001)
Brüning, Oliver Simon, Fartoukh, Stéphane David
Based on criteria of different nature such as the control of the mechanical aperture or the preservation of the dynamic aperture, hard limits are given for the normal and skew harmonics an and bn , 1...
After summarising the required correction circuits in the LHC we will give a short summary of potential tools for measuring non-linear resonances and error distributions in a storage ring. The aim is...
The talk summarizes the principles of particle acceleration and addresses problems related to storage rings like LEP and LHC. Special emphasis will be given to orbit stability, long term stability of...
Linear Coupling Compensation for the LHC Version 6.1 (2000)
Random and systematic skew-quadrupole errors in the main dipole and quadrupoles magnets and orbit errors in the arc sextupole magnets give rise to a linear coupling of the LHC machine. Operating the...
Electron Cloud Effects in the CERN SPS and LHC (2000)
Arduini, Gianluigi, Baglin, V, Brüning, Oliver Simon, Cappi, R, Caspers, Friedhelm, Collier, Paul, ...
Electron cloud effects have been recently observed in the CERN SPS in the presence of LHC type proton beams with 25 ns bunch spacing. Above a threshold intensity of about 4 X 10^12 protons in 81...
A Beam Separation and Collision Scheme for IP2 and IP8 at the LHC for Optics Version 6.1 (2000)
Brüning, Oliver Simon, Herr, Werner, Ostojic, R
In this report we describe the proposed beam separation and collision schemes for interaction points 2 (ALICE experiment) and 8 (LHCb) in the LHC for optics version 6. The original proposal for...
A Beam Separation and Collision Scheme for IP1 and IP5 at the LHC for Optics Version 6.1 (1999)
Brüning, Oliver Simon, Herr, Werner, Ostojic, R
In this report we describe the proposed beam separation and collision schemes for interaction points 1 and 5 in the LHC for optics version 6. The original proposal for optics version 5 was redesigned...
Electron Cloud and Beam Scrubbing in the LHC (1999)
Brüning, Oliver Simon, Caspers, Friedhelm, Collins, I R, Gröbner, Oswald, Henrist, Bernard, Hilleret, Noël, ...
An adequate dose of photoelectrons, accelerated by low-intensity proton bunches and hitting the LHC beam screen wall, will substantially reduce secondary emission and avoid the fast build-up of an...
Impact of and Protection against Failures of the LHC Injection Kickers (1999)
Brüning, Oliver Simon, Hilaire, A, Jeanneret, J B, Péraire, S, Mertens, V, Sala-Ferrari, P, ...
Multipacting Tests with Magnetic Field for the LHC Beam Screen (1998)
Brüning, Oliver Simon, Caspers, Friedhelm, Laurent, Jean Michel, Morvillo, M, Ruggiero, F
In connection with electron-cloud induced heating of the LHC beam screen, multipacting tests with a resonant coaxial cavity have been successfully performed in presence of a solenoid and a dipole...
Beam-Induced Electron Cloud in the LHC and Possible Remedies (1998)
Baglin, V, Brüning, Oliver Simon, Calder, R, Caspers, Friedhelm, Collins, I R, Gröbner, Oswald, ...
Synchrotron radiation from proton bunches in the LHC creates photoelectrons at the beam screen wall. These photoelectrons are accelerated towards the positively charged proton bunch and drift across...
Optics Solutions for the Combined Experimental and Injection Regions in the LHC (1998)
The geometrical acceptance in the interaction regions of the LHC must be large enough to accommodate both beams in the common part of the ring with a beam separation of 10 $\sigma$ at injection. In...
Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen (1998)
The following work summarises simulation results obtained at CERN for the beam-induced electron cloud and looks at possible cures for the heat load in the LHC beam screen. The synchrotron radiation...
The paper presents new simulation results for the beam-induced electron cloud in the LHC beam screen. All simulations are carried out using an improved two-dimensional module for the space charge and...
Parasitic Energy Loss in the LEP Superconducting Cavities (1997)
Arduini, Gianluigi, Brüning, Oliver Simon, Cavallari, Giorgio, Gayet, P, Geschonke, Günther, Häbel, E, ...
The energy loss of bunches in the LEP superconducting (SC) cavities has been determined by measuring the closed orbit as a function of current with the beam position monitors located at finite...
Summary of the single-beam collective effects in the LHC (1997)
Berg, J S, Brüning, Oliver Simon, Caspers, Friedhelm, Dyachkov, M, Morvillo, M, Ruggiero, F
Single beam collective effects can limit the performance of the LHC and, together with parasitic losses, impose constraints on the design of the components of the LHC vacuum system. Because of the...
An Impedance Data Base Program for LEP2 and the LHC (1997)
The development of an impedance data base program was motivated by the changing impedance budgets in the LEP and LHC machines and the resulting need to recalculate the instability thresholds for...
Beam Echoes in the CERN SPS (1997)
Brüning, Oliver Simon, Linnecar, Trevor Paul R, Ruggiero, F, Scandale, Walter, Shaposhnikova, Elena, Stellfeld, D
Longitudinal echo signals have been produced in the CERN SPS by exciting a proton beam at 120~GeV/c with two short RF pulses separated by a suitable time-delay. The aim of the experiments was to...
Feasibility study for compensating the anharmonicities in LEP with additional octupoles (1997)
Brüning, Oliver Simon, Koutchouk, Jean-Pierre
Operating LEP with the 108/90 optics at the end of the 1996 run indicated a limitation of the dynamic aperture due to a combined effect of non-linear resonances and anharmonicities. This note...
ZBASE User's Guide Version 1.1: an Impedance Data Base Program (1996)
The development of an impedance data base program was motivated by the changing impedance budgets in the LEP and LHC machines and the resulting need to recalculate the instability thresholds for...
Longitudinal beam echo in the CERN SPS (1996)
Brüning, Oliver Simon, Linnecar, Trevor Paul R, Ruggiero, F, Scandale, Walter, Shaposhnikova, Elena, Stellfeld, D
The presented work summarizes the results of two experiments in the CERN SPS. Longitudinal echo signals can be produced in the CERN-SPS by exciting a coasting proton beam at 120 GeV/c with two short...