The LHC Main Quadrupoles During Series Fabrication

Tortschanoff, T.; Burgmer, R.; Durante, M.; Hagen, P.; Klein, Ulf; Krischel, D.; Payn, A.; Rossi, L.; Schellong, B.; Schmidt, P.; Simon, F.; Schirm, K.; Todesco, E.

doi:10.1109/tasc.2006.871223

Cited by 6 publications

(5 citation statements)

References 5 publications

(5 reference statements)

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“…These flow restrictions not only have to withstand pressure rises of up to 20 bar at cold but also to electrically insulate the main and secondary busbars from the surrounding steel tubes. The development of these restrictions was the subject of an intensive development at CEA-Saclay and then of an industrialization phase at CERN [5]. The fabrication and mounting of these restrictions onto about 300 pairs of bus-bars was then performed in a dedicated workplace at CERN and could be achieved just in time for the cold mass assembly.…”

Section: Special Issuesmentioning

confidence: 99%

Completion of the series fabrication of the main superconducting quadrupole magnets of LHC

Tortschanoff

Modena

Papaphilippou

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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By end of November 2006, the last main superconducting quadrupole cold mass needed for the installation was delivered by ACCEL Instruments to CERN. In total, 360 cold masses for the arc regions of the machine and 32 special units dedicated to the dispersion suppressor regions are installed in the LHC ring. The latter ones contain the same main magnet but different types of correctors and are of increased length with respect to the regular arc ones. The end of the fabrication of these magnets coincided with the end of the main dipole deliveries allowing a parallel assembly into their cryostats and installation into the LHC tunnel. The positioning into the tunnel was optimized using the warm field measurements performed in the factory. On the other hand, the correct slot assignment of the quadrupoles was complicated due to the multitude of variants and to the fact that a number of units needed to be replaced by spares which were customized for other slots. The paper gives some final data about the successful fabrication at ACCEL Instruments and explains the issue of their best positions in the machine. AbstractBy end of November 2006, the last main superconducting quadrupole cold mass needed for the installation was delivered by ACCEL Instruments to CERN. In total, 360 cold masses for the arc regions of the machine and 32 special units dedicated to the dispersion suppressor regions are installed in the LHC ring. The latter ones contain the same main magnet but different types of correctors and are of increased length with respect to the regular arc ones. The end of the fabrication of these magnets coincided with the end of the main dipole deliveries allowing a parallel assembly into their cryostats and installation into the LHC tunnel. The positioning into the tunnel was optimized using the warm field measurements performed in the factory. On the other hand, the correct slot assignment of the quadrupoles was complicated due to the multitude of variants and to the fact that a number of units needed to be replaced by spares which were customized for other slots. The paper gives some final data about the successful fabrication at ACCEL Instruments and explains the issue of their best positions in the machine.

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Section: Special Issuesmentioning

confidence: 99%

Completion of the series fabrication of the main superconducting quadrupole magnets of LHC

Tortschanoff

Modena

Papaphilippou

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…The design of the arc short straight sections is described in detail in [2][3][4][5]. For the scope of the present paper only the main design features in view of the discussion of the test results will be recalled.…”

Section: Magnet Design Featuresmentioning

confidence: 99%

“…The cold mass consists of a 5.35 m long austenitic stainless steel inertia tube into which are aligned the twin-aperture quadrupole and two pairs of different auxiliary magnets at each end of the quadrupole. Combined dipole-sextupole corrector units are located at one end (MSCB) whilst either two small octupole (MO) or two tuning quadrupoles (MQT) are mounted in the other end [5]. T III.…”

Section: Magnet Design Featuresmentioning

confidence: 99%

Electrical and Magnetic Performance of the LHC Short Straight Sections

Sanfilippo

Beauquis²,

Bottura³

et al. 2006

IEEE Trans. Appl. Supercond.

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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 features of the lattice quadrupole magnets are a two-in-one structure containing two 56 mm aperture, two-layers coils wound from 15.1 mm wide NbTi cables, enclosed by the stainless steel collars and ferromagnetic yoke, and inserted into the inertia tube. Systematic cryogenic tests are performed at CERN in order to qualify these magnets with respect to their cryogenic and electrical integrity, the quench performance and the field quality in all operating conditions. This paper reports the main results obtained during tests and measurements in superfluid helium. The electrical characteristics, the insulation measurements and the quench performance are compared to the specifications and expected performances for these magnets. The field in the main quadrupole is measured using three independent systems: 10-m long twin rotating coils, an automatic scanner, and single stretched wire. A particular emphasis is given to the integrated transfer function which has a spread of around 12 units rms in the production and is a critical issue. The do-decapole harmonic component, which required trimming through a change in coil shims, is also discussed. Finally, the magnetic axis measurements at room temperature and at 1.9 K, providing the nominal vertical shift for installation are reported. Abstract -The Short Straight Section (SSS) for the LargeHadron Collider arcs, containing in a common cryostat the lattice quadrupoles and correction magnets, have now entered series production. The foremost features of the lattice quadrupole magnets are a two-in-one structure containing two 56 mm aperture, two-layers coils wound from 15.1 mm wide NbTi cables, enclosed by the stainless steel collars and ferromagnetic yoke, and inserted into the inertia tube. Systematic cryogenic tests are performed at CERN in order to qualify these magnets with respect to their cryogenic and electrical integrity, the quench performance and the field quality in all operating conditions. This paper reports the main results obtained during tests and measurements in superfluid helium. The electrical characteristics, the insulation measurements and the quench performance are compared to the specifications and expected performances for these magnets. The field in the main quadrupole is measured using three independent systems: 10-m long twin rotating coils, an automatic scanner, and single stretched wire. A particular emphasis is given to the integrated transfer function which has a spread of around 12 units rms in the production and is a critical issue. The do-decapole harmonic component, which required trimming through a change in coil shims, is also discussed. Finally, the magnetic axis measurements at room temperature and at 1.9 K, providing the nominal vertical shift for installation are reported.

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“…For the development of the required technologies and for testing the operational devices at cryogenic temperatures, CERN operates a number of facilities, ranging from individual component tests to the final validation of the full scale magnets and cavities before installation. SM18 is the largest of these facilities, dedicated mainly to testing large magnets and superconducting RF cavities as well as other specific devices [1]; this is for example where the dipole and quadrupole cryo-magnets of the LHC were tested in 2002-2007 [2][3][4][5]. In addition to cryogenic testing SM18 is also a major area for conditioning and integrating the RF cavities before installation in the accelerator facilities…”

Section: Introductionmentioning

confidence: 99%

Upgrade of the cryogenic infrastructure of SM18, CERN main test facility for superconducting magnets and RF cavities

Perin

Dhalla

Gayet

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. SM18 is CERN main facility for testing superconducting accelerator magnets and superconducting RF cavities. Its cryogenic infrastructure will have to be significantly upgraded in the coming years, starting in 2019, to meet the testing requirements for the LHC High Luminosity project and for the R&D program for superconducting magnets and RF equipment until 2023 and beyond. This article presents the assessment of the cryogenic needs based on the foreseen test program and on past testing experience. The current configuration of the cryogenic infrastructure is presented and several possible upgrade scenarios are discussed. The chosen upgrade configuration is then described and the characteristics of the main newly required cryogenic equipment, in particular a new 35 g/s helium liquefier, are presented. The upgrade implementation strategy and plan to meet the required schedule are then described.

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The LHC Main Quadrupoles During Series Fabrication

Cited by 6 publications

References 5 publications

Completion of the series fabrication of the main superconducting quadrupole magnets of LHC

Completion of the series fabrication of the main superconducting quadrupole magnets of LHC

Electrical and Magnetic Performance of the LHC Short Straight Sections

Upgrade of the cryogenic infrastructure of SM18, CERN main test facility for superconducting magnets and RF cavities

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