Upgrade of the protection system for superconducting circuits in the LHC (2009)
Denz, R, Dahlerup-Petersen, K, Formenti, F, Meß, K H, Siemko, A, Steckert, J, ...
Prior to the re-start of the Large Hadron Collider LHC in 2009 the protection system for superconducting magnets and bus-bars QPS will be substantially upgraded. The foreseen modifications will...
Methods to detect faulty splices in the superconducting magnet system of the LHC (2009)
Bailey, R, Bellesia, B, Catalan Lasheras, N, Dahlerup-Petersen, K, Denz, R, Robles, C, ...
The incident of 19 September 2008 at the LHC was caused by a faulty inter-magnet splice of about 200 nΩ resistance. Cryogenic and electrical techniques have been developed to detect other abnormal...
Report of the Task Force on the Incident of 19th September 2008 at the LHC (2009)
Bajko, M, Bertinelli, F, Catalan-Lasheras, N, Claudet, S, Cruikshank, P, Dahlerup-Petersen, K, ...
This report summarizes the findings and recommendations of the AT department Task Force established to investigate the 19th September 2008 incident which occurred in sector 3-4 of the LHC. It...
Short Circuit Tests: First Step of LHC Hardware Commissioning Completion (2008)
Barbero-Soto, E, Bellesia, B, Bordry, Frederick, Casas Lino, M P, Coelingh, G J, Cumer, G, ...
For the two counter rotating beams in the Large Hadron Collider (LHC) about 8000 magnets (main dipole and quadrupole magnets, corrector magnets, separation dipoles, matching section quadrupoles etc.)...
Cooling process of the LHC energy extraction resistors (2008)
Peón-Hernández, G, Dahlerup-Petersen, K, Coelingh, G J
The energy stored in all the LHC dipoles, about 11 GJ, can potentially cause severe damage to the magnets, bus bars and current leads. In order to protect the superconducting elements after a...
Performance of the Main Dipole Magnet Circuits of the LHC during Commissioning (2008)
Verweij, A, Baggiolini, V, Ballarino, A, Bellesia, B, Bordry, Frederick, Cantone, A, ...
During hardware commissioning of the Large Hadron Collider (LHC), 8 main dipole circuits are tested at 1.9 K and up to their nominal current. Each dipole circuit contains 154 magnets of 15 m length,...
Electronic Systems for the Protection of Superconducting Devices in the LHC (2008)
Denz, R, Dahlerup-Petersen, K, Mess, K H
The Large Hadron Collider LHC [1] incorporates an unprecedented amount of superconducting components: magnets, bus-bars, and current leads. Most of them require active protection in case of a...
Results from Commissioning of the Energy Extraction Facilities of the LHC Machine (2008)
Coelingh, G J, Dahlerup-Petersen, K, Mess, K H
The risk of damage to the superconducting magnets, bus bars and current leads of the LHC machine in case of a resistive transition (quench) is being minimized by adequate protection. The protection...
Venturini-Delsolaro, W, Baggiolini, V, Ballarino, A, Bellesia, B, Bordry, Frederick, Cantone, A, ...
The LHC is a complex machine requiring more than 7400 superconducting corrector magnets distributed along a circumference of 26.7 km. These magnets are powered in 1446 different electrical circuits...
The Quench Protection System for the LHC Test String 2 (2004)
Rodríguez-Mateos, F, Dahlerup-Petersen, K, Denz, R, Milani, D, Tegenfeldt, F
The Large Hadron Collider (LHC) String programme has focussed over the years the efforts of many teams that have tested and validated their systems under operating conditions close to the final ones...
The Quench Protection System for the LHC Test String 2 (2004)
Rodríguez-Mateos, F, Dahlerup-Petersen, K, Denz, R, Milani, D, Tegenfeldt, F
The Large Hadron Collider (LHC) String programme has focussed over the years the efforts of many teams that have tested and validated their systems under operating conditions close to the final ones...
Dahlerup-Petersen, K, Bourgeois, F
Key information for determination of fundamental design features of magnet powering and protection circuits can be retrieved from the results of transmission line calculations of the superconducting...
Dahlerup-Petersen, K, Bourgeois, F
Key information for determination of fundamental design features of magnet powering and protection circuits can be retrieved from the results of transmission line calculations of the superconducting...
Bourgeois, F, Dahlerup-Petersen, K
Electrical modeling and simulation of the LHC magnet strings are being used to determine the key parameters that are needed for the design of the powering and energy extraction equipment. Poles and...
Bourgeois, F, Dahlerup-Petersen, K
Electrical modeling and simulation of the LHC magnet strings are being used to determine the key parameters that are needed for the design of the powering and energy extraction equipment. Poles and...
First Results and Status of the LHC Test String 2 (2002)
Saban, R I, Van Weelderen, R, Thiesen, H, Tegenfeldt, F, Serio, L, Schmidt, R, ...
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...
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...
First Powering of the LHC Test String 2 (2002)
Saban, R I, Bordry, F, Bozzini, D, Dahlerup-Petersen, K, Denz, R, Puccio, B, ...
String 2 is a full-size model of a regular cell in an LHC arc. In the first phase, three dipole magnets and two quadrupole magnets have been assembled in String 2 and commissioning started in April...
First Powering of the LHC Test String 2 (2002)
Saban, R I, Bordry, Frederick, Bozzini, D, Dahlerup-Petersen, K, Denz, R, Puccio, B, ...
String 2 is a full-size model of a regular cell in an LHC arc. In the first phase, three dipole magnets and two quadrupole magnets have been assembled in String 2 and commissioning started in April...
Energy Extraction in the CERN Large Hadron Collider (2001)
Dahlerup-Petersen, K, Erokhin, A, Kazmine, B, Medvedko, A S, Sytchev, V, Vasilev, L B
In case of a resistive transition (quench), fast and reliable extraction of the magnetic energy, stored in the superconducting coils of the electromagnets of a particle collider, represents an...
Energy Extraction in the CERN Large Hadron Collider: a Project Overview (2001)
Dahlerup-Petersen, K, Erokhin, A, Kazmine, B, Medvedko, A S, Sytchev, V V, Vasilev, L B
In case of a resistive transition (quench), fast and reliable extraction of the magnetic energy, stored in the superconducting coils of the electromagnets of a particle collider, represents an...
The Commissioning of the LHC Test String 2 (2001)
Bordry, F, Bozzini, D, Casas-Cubillos, J, Cruikshank, P, Dahlerup-Petersen, K, Denz, R, ...
String 2 [1,2] is a full-size model of an LHC cell of the regular part of the arc. It is composed of six dipole magnets with their correctors, two short straight sections with their orbit and lattice...
Energy Extraction for the LHC Superconducting Circuits (2001)
Dahlerup-Petersen, K, Rodríguez-Mateos, F, Schmidt, R, Sonnemann, F
The superconducting magnets of the LHC will be powered in about 1700 electrical circuits. The energy stored in circuits, up to 1.3 GJ, can potentially cause severe damage of magnets, bus bars and...
The Commissioning of the LHC Test String 2 (2001)
Bordry, Frederick, Bozzini, D, Casas-Cubillos, J, Cruikshank, P, Dahlerup-Petersen, K, Denz, R, ...
String 2 [1,2] is a full-size model of an LHC cell of the regular part of the arc. It is composed of six dipole magnets with their correctors, two short straight sections with their orbit and lattice...
Energy Extraction for the LHC Superconducting Circuits (2001)
Dahlerup-Petersen, K, Rodríguez-Mateos, F, Schmidt, R, Sonnemann, F
The superconducting magnets of the LHC will be powered in about 1700 electrical circuits. The energy stored in circuits, up to 1.3 GJ, can potentially cause severe damage of magnets, bus bars and...
Anushat, V, Dahlerup-Petersen, K, Erokhin, A, Kussul, A, Medvedko, A S
This article presents the results of modeling and computer simulation of non-linear devices such as the Electromagnetic Driver of a D.C. Circuit Breaker. The mechanical and electromagnetic parts of...
Energy Extraction Resistors for the Main Dipole and Quadrupole Circuits of the LHC (2000)
Dahlerup-Petersen, K, Kazmine, B, Popov, V, Sytchev, V, Vasilev, L B, Zubko, V G
When the LHC will be operating at its maximum beam energy, its superconducting dipole chains store a total magnetic energy of more than 11 GJ. At the same time, the QF and QD quadrupole circuits...
Energy Extraction Resistors for the Main Dipole and Quadrupole Circuits of the LHC (2000)
Dahlerup-Petersen, K, Kazmine, B, Popov, V, Sytchev, V V, Vasilev, L B, Zubko, V G
When the LHC will be operating at its maximum beam energy, its superconducting dipole chains store a total magnetic energy of more than 11 GJ. At the same time, the QF and QD quadrupole circuits...
The Protection System for the Superconducting Elements of the Large Hadron Collider at CERN (1999)
Dahlerup-Petersen, K, Denz, R, Gómez-Costa, J L, Hagedorn, Dietrich, Proudlock, Paul, Rodríguez-Mateos, F, ...
The protection system for the superconducting elements of the Large Hadron Collider (LHC) [1] at the European Laboratory for Particle Physics (CERN), and its associated equipment are presented:...
The Protection System for the Superconducting Elements of the Large Hadron Collider at CERN (1999)
Dahlerup-Petersen, K, Denz, R, Gómez-Costa, J L, Hagedorn, Dietrich, Proudlock, Paul, Rodríguez-Mateos, F, ...
The protection system for the superconducting elements of the Large Hadron Collider (LHC) [1] at the European Laboratory for Particle Physics (CERN), and its associated equipment are presented:...
The LHC Magnet String Programme (1999)
Bordry, F, Casas-Cubillos, J, Cruikshank, P, Dahlerup-Petersen, K, Rodríguez-Mateos, F, Proudlock, Paul, ...
The LHC Magnet String Programme: Status and Future Plans (1999)
Bordry, Frederick, Casas-Cubillos, J, Cruikshank, P, Dahlerup-Petersen, K, Rodríguez-Mateos, F, Proudlock, Paul, ...
A 20 kA Test Bench for High-Precision Current Measurements (1999)
Dahlerup-Petersen, K, Halvarsson, Bjorn, Valbuena, R
The d.c. currents in the LHC dipole and quadrupole chains will require settings and adjustments with a precision of a few ppm. For an ultimate current level of 13 kA this represents an unprecedented...
A 20 kA Test Bench for High-Precision Current Measurements (1999)
Dahlerup-Petersen, K, Halvarsson, Bjorn, Valbuena, R
The d.c. currents in the LHC dipole and quadrupole chains will require settings and adjustments with a precision of a few ppm. For an ultimate current level of 13 kA this represents an unprecedented...
The LHC Prototype Full-Cell: Design Study (1998)
Bordry, Frederick, Brunet, J C, Casas-Cubillos, J, Cruikshank, P, Dahlerup-Petersen, K, Delruelle, N, ...
As a continuation of the experimental program carried-out with String 1, project management decided toward the end of 1995 to construct an LHC prototype Full-Cell, also known as String 2. The present...
Experiments and cycling at the LHC prototype helf-cell (1997)
Casas-Cubillos, J, Collier, Paul, Cruikshank, P, Dahlerup-Petersen, K, Desforges, D, Hilbert, B, ...
The first version of the LHC prototype half-cell has been in operation since February 1995. It consists of one quadrupole and three 10-m twin aperture dipole magnets which operate at 1.8 K. This...
Experiments and cycling at the LHC prototype helf-cell (1997)
Casas-Cubillos, J, Collier, Paul, Cruikshank, P, Dahlerup-Petersen, K, Desforges, D, Hilbert, B, ...
The first version of the LHC prototype half-cell has been in operation since February 1995. It consists of one quadrupole and three 10-m twin aperture dipole magnets which operate at 1.8 K. This...
Evaluation of Impact from Ripple and Transient Phenomena in the LHC Dipole Strings (1996)
Dahlerup-Petersen, K, Schmidt, F
Based on measurements of the A.C. electrical characteristics of prototype magnets, synthesized computer models of the principal, individual, superconducting magnetic elements of the Large Hadron...
Evaluation of Impact from Ripple and Transient Phenomena in the LHC Dipole Strings (1996)
Dahlerup-Petersen, K, Schmidt, F
Based on measurements of the A.C. electrical characteristics of prototype magnets, synthesized computer models of the principal, individual, superconducting magnetic elements of the Large Hadron...
The LHC test string: first operational experience (1996)
Bézaguet, Alain-Arthur, Brahy, D, Casas-Cubillos, J, Coull, L, Cruikshank, P, Dahlerup-Petersen, K, ...
CERN operates the first version of the LHC Test String which consists of one quadrupole and three 10-m twin aperture dipole magnets. An experimental programme aiming at the validation of the LHC...
Electrical performance of a string of magnets representing a half-cell of the LHC machine (1995)
Rodríguez-Mateos, F, Coull, L, Dahlerup-Petersen, K, Hagedorn, Dietrich, Krainz, G, Rijllart, A, ...