1.9 K test facility for the reception of the superconducting cables for the LHC

Verweij, Arjan; Genest, Jérôme; Knezovic, A.; Leroy, D.; Marzolf, J.-P.; Oberli, L.

doi:10.1109/77.783259

Cited by 57 publications

(39 citation statements)

References 4 publications

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“…An array of Hall probes is located next to each cable sample to verify the uniformity of the transport current among the strands during test. More details about the test facility and the background magnet can be found in [4] and [7] respectively.…”

Section: B Cern Test Facility (Fresca)mentioning

confidence: 99%

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Critical Current Measurements of the Main LHC Superconducting Cables

Verweij

Ghosh

2007

IEEE Trans. Appl. Supercond.

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Abstract-For the main dipole and quadrupole magnets of the LHC, CERN has ordered from industry about 7000 km of superconducting Nb-Ti Rutherford type cables, delivered between 1999 and 2005. The strands of these cables are produced by six different companies, and cabled on five different machines. In the framework of the US contribution to the LHC, BNL has been testing and analyzing the electrical properties of samples of these cables. The main purpose of these tests was to qualify the critical current of the entire cable production in the frame of the quality assurance program implemented by CERN to assure the overall strand and cable performances.In total more than 2100 cable samples have been evaluated at 4.3 K in terms of critical current C , n-value and the residual resistance ratio, RRR. This paper will present an overview of the results, and show the correlations of the critical current and n-value between virgin strands, extracted strands, and cables.Also described are correlations of C measured at BNL and those made at the FRESCA facility in CERN. Furthermore a few trends and anomalies of the cable production that were detected from testing cables are highlighted.

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Section: B Cern Test Facility (Fresca)mentioning

confidence: 99%

“…This large test program required an upgrade of the BNL test facility from one to three cryostats. In parallel, at CERN a new test facility (called FRESCA) was built during the years 1995-1998 [4]. The main purpose of FRESCA was to verify the 1.9-4.2 K correlation during LHC production, and to investigate in detail any suspicious cable.…”

Section: Introductionmentioning

confidence: 99%

Critical Current Measurements of the Main LHC Superconducting Cables

Verweij

Ghosh

2007

IEEE Trans. Appl. Supercond.

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“…The test facility called fresca is built for the reception tests of superconducting cables for lhc magnets [62]. The main features of the test station are:…”

Section: Fresca Cable Test Facilitymentioning

confidence: 99%

Stability of superconducting Rutherford cables for accelerator magnets

Willering

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f c e e r g s o r a c l r a t o m a n e t Gerard Willering S t a b i l i t y o f S u p e r c o n d u c t i n g r C b l e R u t h e f o r d a s PrefaceThe work described in this thesis results from an extensive collaboration between the special chair for Industrial Application of Superconductors in the Low Temperature Division at the University of Twente and the Magnets, Superconductors and Cryostats group at CERN. The research has been carried out at CERN as well as at the University of Twente and it is funded by both institutes. Part of the cable samples were prepared by GSI in the frame of research collaboration on cable stability.I am very grateful to the members of these groups for giving me the opportunity to perform the research, for their interest and useful discussions.i ContentsPreface i Chapter 1 IntroductionAfter the discovery of superconductivity in the beginning of the 20 th century the understanding of the phenomenon has grown. Practical conductors are produced for various magnet applications. Although the number of superconducting materials is high, only a few can be used in high-field and high-current density applications. This thesis deals with cable stability, with the focus on application in accelerator magnets.In this chapter a brief overview of the existing and near future accelerators and their superconducting magnets is presented. The most recent superconducting accelerator, the lhc and the near future superconducting accelerator sis 300 are described.The phenomenon of superconductivity is shortly discussed and practical superconductors are introduced with an emphasis on strands and cables. Different types of cables are presented and the relevance of this thesis for in particular the Rutherford type of cable is discussed.The terms quench and recovery are introduced. The importance of research on stability is illustrated by the large number of training quenches in the lhc main dipole magnets. Superconducting accelerator magnetsIn High Energy Physics the interaction of elementary particles is being studied. Many particle accelerators have been constructed to accelerate particles and collide them at high energy. Synchrotron accelerators provide a circular track with RFcavities to accelerate bunches of particles each cycle.Synchrotron accelerators require dipole magnets to bend the particle beam and keep it in its circular track. Quadrupole magnets are used to focus and defocus the beam and higher-order magnets correct field distortions and chromaticity. The collision energy depends on the magnetic field in the aperture of the dipole B a (T) and the bending radius of the dipole magnets r d (km) following E ≈ 0.3B a r d (TeV). The limitation in the track circumference is strongly dictated by the amount of material and the costs involved. In normal conducting magnets iron is applied to enhance the electromagnetic field produced with copper windings. The magnetic field in iron saturates at about 2 T, therefore the needed amount of copper windings and the costs involved increase strongly for hig...

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“…In the literature there are not much data regarding the behavior of Rutherford cables under high transverse pressure [1]- [5] and some of the published results are contradictory. The FRESCA cable test facility at CERN [6] is capable to apply a uniform magnetic field over a cable length of 60 cm, hence it has the potentiality to become the reference test station in the world for such type of measurements. It has been evaluated that at present the FRESCA sample holder can apply a maximum transverse pressure equal to 60 MPa on 10 mm wide cables.…”

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Conceptual Design of a New Sample Holder for the FRESCA Cable Test Station

Bordini

Regis

Crettiez

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-At present Nb 3 Sn Rutherford Cables seem to be the most suitable conductors for next generation superconducting accelerator magnets. These magnets will have a peak field in the coils larger than 10 T and the large Lorentz forces will impose coil pre-stresses significantly larger than 100 MPa. Since Nb 3 Sn is strongly sensitive to strain it is mandatory to characterize the cable under a transverse pressure comparable to the one experienced in future magnets. As a part of its High Field Magnet program, CERN is developing a sample holder for the FRESCA Facility that allows testing 10 mm wide superconducting Rutherford cables under a transverse pressure up to 200 MPa. The sample holder will be able to house cables up to 20 mm wide. In this paper the conceptual design is presented together with the experimental results of the mechanical test performed on a 40 cm long model. The results show that the structure can apply a transverse pressure larger than 200 MPa on 10 mm wide cables with sufficiently high pressure homogeneity.

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1.9 K test facility for the reception of the superconducting cables for the LHC

Cited by 57 publications

References 4 publications

Critical Current Measurements of the Main LHC Superconducting Cables

Critical Current Measurements of the Main LHC Superconducting Cables

Stability of superconducting Rutherford cables for accelerator magnets

Conceptual Design of a New Sample Holder for the FRESCA Cable Test Station

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