Cryogenic tests of the first two LHC quadrupole prototypes

Genevey, Pierre; Deregel, J.; Pérot, J.; Rifflet, J. M.; Védrine, P.; Cortella, J.; Coroller, A. Le; Rodriguez-Mateos, F.; Siegel, N.; Tortschanoff, T.; Verweij, Arjan

doi:10.1109/77.402524

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Two full size quadrupoles of 56 mm aperture and 3 metre length have been designed, constructed and tested under a CERN-CEN/Saclay collaboration [20]. Both magnets have reached their design field gradient with very few quenches (Fig.…”

Section: B Quadrupoles and Other Magnetsmentioning

confidence: 99%

Status of LHC programme and magnet development

Perin

1995

IEEE Trans. Appl. Supercond.

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The Large Hadron Collider (LHC) is a superconducting acceleratodcollider for protons, heavy ions and electron-proton collisions in the multi-TeV energy range, which will be installed at CERN in the 27 km tunnel of LEP. This new facility will mainly consist of a double ring of high field superconducting magnets operating in superfluid helium at the temperature of 1.9 K. To reach the wanted beam energy (7 TeV for protons) the main dipole magnets will operate at about 8.4 T and the quadrupoles at 220 T/m field gradient. These main magnets have a two-in-one configuration with the magnetic channels for the two beams placed in a common yoke and cryostat.The LHC will have more than 10'000 superconducting magnetic units. The arcs of the machine will require about 1250,14 m long dipoles and 400,3 m long quadrupoles.After a general outline of the project with more detailed information on the design of the magnets, the paper describes the state of magnet R&D and presents results of short models, among which one reached the record dipole field of 10.5 T, as well as of industry made full scale prototypes which have been successfully tested and measured.

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Section: B Quadrupoles and Other Magnetsmentioning

confidence: 99%

Status of LHC programme and magnet development

Perin

1995

IEEE Trans. Appl. Supercond.

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“…As this indicates the existence of a 'I`he design gradient was reached for the two magnets after very the regular straight part, almost all in the outer layer of the Saclay (F) in the frame of a CERN-CEA Collaboration [18]. experience in short and long magnets, all quenches started in 3 m length have been designed, constructed and tested at CEN, behaviour.…”

Section: Ion Collhder (Ri-iic)mentioning

confidence: 89%

Superconducting magnets

Perin

Proceedings Particle Accelerator Conference

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operation of a "string" test facility simulating the basic machine half-cell. EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH than specified. Some lm long model quadrupoles were occurred instead because of a too fast down-ramp rate during OCR Output retraining after thermal cycling. Their field quality was better cells) by heat transported through helium. Propagation they exhibited training from 6.6+7.2 kA to 8 kA and some adjacent quarter cells (the string was subdivided into quarter length prototype quadrupoles were built at LBL. TypicallyThere was no evidence of quench propagation between component at injection needed to be better controlled. Full mentioned:within requirements, only the drift of the skew quadrupole Among the results of general interest the following should be excellent with little training. Their field quality was generally using superconducting magnets and in particular the LHC.performance at the operation temperature of 4.35 K was gathered with this test will help any future accelerator project prototype dipoles were built at BNL and FNAL. Their quench and three spool pieces [6]. The very valuable experience design, materials and fabrication techniques [5]. Most of the cell of the machine, comprising ten dipoles, two quadrupoles progress and has led to many advancements in understanding, decision to terminate the project, was the power test of a full during a decade the main stimulation of accelerator magnetThe last important activity on the SSC magnets, after the due to the unfortunate termination of the project, has been starting at about 7.5 kA.The SSC magnet development programme, presently ended conductor short sample limit, 8.4 kA, after a few quenches manufactured by a US/German consortium. They reached the Design parameters of superconducting main magnets in accelerator/colliders Table I reduction of costs and space occupancy. cost and space occupancy. Superconducting magnets have be the two-in-one configuration leading to a considerable cavities, identified as the means to reach higha energy saving of the traditional NbTi supuconductor, and by the adopdon of prime promoter of applied superconducdvity, magnets and r.f. superfluid helium technique, thus enhancing the performance High Energy Physics has been for almost three decades the gradient. A bold step is being made with the LHC using the I. INTRODUCTION reinements in manufactiuing have permitted to raise Eeld and better insuladon systems and face containment structures and facility simulating the basic machine ha1f·ce11.Improvement in performance of superconductors [3,4], aperture dipoles and the successful operation of a "s¤ing" test main magnets for accelerators is recalled in Table I

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“…The two 3-m-long, 56-mm-twin-aperture cold masses were completed mid-1993 [3,4] and were cold tested in a helium superfluid bath at the Saclay horizontal test facility [5]. They both reached the pink-book nominal current of 15060 A (corresponding to a 10 T dipole field and a 252 T/m quadrupole gradient) after a limited number of training quenches [6,7]. The first cold mass was then shipped to CERN to be cryostated for a string test along with two dipole magnets [8], while the second cold mass was kept at Saclay to undergo magnetic measurements.…”

Section: Introductionmentioning

confidence: 99%

Dynamic field quality of LHC/Saclay arc quadrupole magnet prototype

Devred

Belorgey²,

Deregel³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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As part of the magnet R&D program for the Large Hadron Collider (LHC), CEA Saclay has designed and built two 3-m-long, 56-mm-twin-aperture arc quadrupole magnet prototypes. Extensive harmonic field measurements were performed during the cold test of the second prototype, using a newly developed magnetic measurement system. After a brief description of the new system, a review of the field quality data as a function of axial position and current is presented.

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Cryogenic tests of the first two LHC quadrupole prototypes

Cited by 7 publications

References 5 publications

Status of LHC programme and magnet development

Status of LHC programme and magnet development

Superconducting magnets

Dynamic field quality of LHC/Saclay arc quadrupole magnet prototype

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