Cryogenic Testing of High Current By-Pass Diode Stacks for the Protection of the Superconducting Magnets in the LHC

Gharib, A.; Hagedorn, D.; Corte, A. della; Zignani, Chiarasole Fiamozzi; Turtù, S.; Brown, D.P.; Rout, Chandra Sekhar

doi:10.1063/1.1774639

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…On the other hand, the magnet voltage in the quenching magnet increased rapidly, and once the magnet voltage reached the forward voltage of the cold diode of 5.6 V, the magnet current started to bypass to the cold diode. Because the forward voltage of the cold diode decreased due to the temperature rise of the diode [10], the voltage, that is, the energy consumed in the magnet decreased immediately after the current bypassing started. These results were almost the same as the results in the prototype test [11].…”

Section: ) Resistances Of Cable Jointsmentioning

confidence: 98%

Commissioning Results of Superconducting Magnet System for the Neutrino Beam Line

Sasaki

Okamura

Kimura

et al. 2010

IEEE Trans. Appl. Supercond.

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The first commissioning of a magnet system for the neutrino beam line in the J-PARC has been performed from January to March, 2009. The magnet system could be cooled down successfully in 9 days. RRRs of all the magnets and joint resistances in the magnet string were measured to be reasonable values. The magnet string composed of 28 superconducting combined function magnets could be excited up to 5000 A after several shutdown tests without a spontaneous quench. A quench protection scheme with a magnet safety system developed by CEA/SACLAY were verified to work properly. As for beam commissioning, the proton beams could pass through the arc section including the superconducting magnet string on the first attempt, and the magnet protection system were verified to work quite well even in a beam induced quench test.Index Terms-Beam induced quench, commissioning, J-PARC, neutrino, quench protection, superconducting combined function magnet.

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Section: ) Resistances Of Cable Jointsmentioning

confidence: 98%

Commissioning Results of Superconducting Magnet System for the Neutrino Beam Line

Sasaki

Okamura

Kimura

et al. 2010

IEEE Trans. Appl. Supercond.

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“…In addition, ENEA tested a pre-series of 14 assemblies of four HTS current leads rated at 600A. In the context of electrical characterization of series of cryogenic devices, ENEA had already collaborated with CERN for the testing campaign, successfully completed at the end of 2004, of the 1400 by-pass diode stacks used for the LHC main dipole and quadrupole magnets quench protection [4]. This paper outlines the dedicated experimental facility built at ENEA for the HTS current leads test, describes the procedures adopted in order to satisfy CERN technical requirements [3], and reports on the performance results of the more than 100 current leads tested up to now.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic Test of High Temperature Superconducting Current Leads at ENEA

Turtù¹,

Corte²,

Zenobio³

et al. 2006

AIP Conference Proceedings

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The LHC (Large Hadron Collider), the accelerator being constructed on the CERN site, involves the operation of more than 8000 superconducting magnets of various current ratings. Essential elements for the powering of these magnets are the HTS current leads. These devices provide the electrical link between the warm cables from/to the power converter and the low temperature superconducting bus bars bringing the current from/to the cryo-magnets. Thus they operate in a temperature range between room temperature and liquid helium temperature. The operation of the LHC will require more than 1000 HTS current leads operating at currents ranging from 600 A to 13000 A. Cryogenic tests of the series of 13000 A and 6000 A HTS current leads are made at ENEA in the framework of a CERN-ENEA collaboration. This report gives an overview of the experimental set-up built in ENEA. The set-up was designed following the typical criterion of a scientific experiment but it was dimensioned to satisfy the schedule of an industrial scale activity, having in mind the large number of components to be tested in a period of less than two years. The related data acquisition system is also described, together with the results of the tests on the current leads. ABSTRACTThe LHC (Large Hadron Collider), the accelerator being constructed on the CERN site, involves the operation of more than 8000 superconducting magnets of various current ratings. Essential elements for the powering of these magnets are the HTS current leads. These devices provide the electrical link between the warm cables from/to the power converter and the low temperature superconducting bus bars bringing the current from/to the cryo-magnets. Thus they operate in a temperature range between room temperature and liquid helium temperature. The operation of the LHC will require more than 1000 HTS current leads operating at currents ranging from 600A to 13000A. Cryogenic tests of the series of 13000A and 6000A HTS current leads are made at ENEA in the framework of a CERN-ENEA collaboration.This report gives an overview of the experimental set-up built in ENEA. The set-up was designed following the typical criterion of a scientific experiment but it was dimensioned to satisfy the schedule of an industrial scale activity, having in mind the large number of components to be tested in a period of less than two years. The related data acquisition system is also described, together with the results of the tests on the current leads.

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“…Recently, new estimations for the expected annual dose and high energy particle fluence due to point losses and beam-gas interactions have been carried out at CERN for the superconducting magnets in the dispersion suppresser regions and for the standard arc magnets [1][2]. Hot-spot regions with doses per year > 100 Gy were identified and details of the dose to the by-pass diodes presented taking into account the lower dose during runningin.…”

Section: Newly Estimated Irradiation Doses In the Lhcmentioning

confidence: 99%

“…Recent estimations indicate that maximum irradiation level occurs in the dispersion suppresser region of the LHC [1][2]. For the diodes installed on quadrupoles, the maximum dose of about 2700 Gy during 20 years is expected whereas the maximum neutron fluence of about 2.0 10 13 n cm -2 will occur on the dipole diodes in this region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radiation Resistance and Life Time Estimates at Cryogenic Temperatures of Series Produced By-Pass Diodes for the LHC Magnet Protection

Denz¹,

Gharib²,

Hagedorn³

2004

AIP Conference Proceedings

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Cryogenic Testing of High Current By-Pass Diode Stacks for the Protection of the Superconducting Magnets in the LHC

Cited by 10 publications

References 1 publication

Commissioning Results of Superconducting Magnet System for the Neutrino Beam Line

Commissioning Results of Superconducting Magnet System for the Neutrino Beam Line

Cryogenic Test of High Temperature Superconducting Current Leads at ENEA

Radiation Resistance and Life Time Estimates at Cryogenic Temperatures of Series Produced By-Pass Diodes for the LHC Magnet Protection

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