Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC

Gerard Willering, C Giloux, M Bajko, M Bednarek, L Bottura, Zinour Charifoulline, Knud Dahlerup-Petersen, G Dib, G D'Angelo, A Gharib, L Grand-Clement, S I Bermudez, H Prin, Victor Roger, Scott Rowan, F Savary, Jean-Phillipe Tock, Arjan Verweij

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

During quench tests in 2011 variations in resistance of an order of magnitude were found in the diode by-pass circuit of the main LHC magnets. An investigation campaign was started to understand the source, the occurrence and the impact of the high resistances. Many tests were performed offline in the SM18 test facility with a focus on the contact resistance of the diode to heat sink contact and the diode wafer temperature. In 2014 the performance of the diodes and diode leads of the main dipole bypass systems in the LHC was assessed during a high current qualification test. In the test a current cycle similar to a magnet circuit discharge from 11 kA with a time constant of 100 s was performed. Resistances of up to 600 µΩ have been found in the diode leads at intermediate current, but in general the high resistances decrease at higher current levels and no sign of overheating of diodes has been seen and the bypass circuit passed the test. In this report the performance of the diodes and in particular the contact resistances in the diode leads are analysed with available data acquired over more than 10 years from acceptance test until the main dipole training campaign in the LHC in 2015.
LanguageEnglish
Article number012076
Number of pages10
JournalIOP Conference Series: Materials Science and Engineering
Volume101
DOIs
Publication statusPublished - 2015
Externally publishedYes
EventIOP Conference Series: Materials Science and Engineering: Cryogenics Engineering - , United Kingdom
Duration: 10 Jun 201510 Jun 2015

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Magnets
Diodes
Contact resistance
Networks (circuits)
Acceptance tests
Heat sinks
Test facilities

Cite this

Willering, G., Giloux, C., Bajko, M., Bednarek, M., Bottura, L., Charifoulline, Z., ... Verweij, A. (2015). Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC. IOP Conference Series: Materials Science and Engineering, 101, [012076]. https://doi.org/10.1088/1757-899X/101/1/012076
Willering, Gerard ; Giloux, C ; Bajko, M ; Bednarek, M ; Bottura, L ; Charifoulline, Zinour ; Dahlerup-Petersen, Knud ; Dib, G ; D'Angelo, G ; Gharib, A ; Grand-Clement, L ; Bermudez, S I ; Prin, H ; Roger, Victor ; Rowan, Scott ; Savary, F ; Tock, Jean-Phillipe ; Verweij, Arjan. / Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC. In: IOP Conference Series: Materials Science and Engineering. 2015 ; Vol. 101.
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title = "Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC",
abstract = "During quench tests in 2011 variations in resistance of an order of magnitude were found in the diode by-pass circuit of the main LHC magnets. An investigation campaign was started to understand the source, the occurrence and the impact of the high resistances. Many tests were performed offline in the SM18 test facility with a focus on the contact resistance of the diode to heat sink contact and the diode wafer temperature. In 2014 the performance of the diodes and diode leads of the main dipole bypass systems in the LHC was assessed during a high current qualification test. In the test a current cycle similar to a magnet circuit discharge from 11 kA with a time constant of 100 s was performed. Resistances of up to 600 µΩ have been found in the diode leads at intermediate current, but in general the high resistances decrease at higher current levels and no sign of overheating of diodes has been seen and the bypass circuit passed the test. In this report the performance of the diodes and in particular the contact resistances in the diode leads are analysed with available data acquired over more than 10 years from acceptance test until the main dipole training campaign in the LHC in 2015.",
author = "Gerard Willering and C Giloux and M Bajko and M Bednarek and L Bottura and Zinour Charifoulline and Knud Dahlerup-Petersen and G Dib and G D'Angelo and A Gharib and L Grand-Clement and Bermudez, {S I} and H Prin and Victor Roger and Scott Rowan and F Savary and Jean-Phillipe Tock and Arjan Verweij",
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Willering, G, Giloux, C, Bajko, M, Bednarek, M, Bottura, L, Charifoulline, Z, Dahlerup-Petersen, K, Dib, G, D'Angelo, G, Gharib, A, Grand-Clement, L, Bermudez, SI, Prin, H, Roger, V, Rowan, S, Savary, F, Tock, J-P & Verweij, A 2015, 'Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC', IOP Conference Series: Materials Science and Engineering, vol. 101, 012076. https://doi.org/10.1088/1757-899X/101/1/012076

Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC. / Willering, Gerard; Giloux, C; Bajko, M; Bednarek, M; Bottura, L; Charifoulline, Zinour; Dahlerup-Petersen, Knud; Dib, G; D'Angelo, G; Gharib, A; Grand-Clement, L; Bermudez, S I; Prin, H; Roger, Victor; Rowan, Scott; Savary, F; Tock, Jean-Phillipe; Verweij, Arjan.

In: IOP Conference Series: Materials Science and Engineering, Vol. 101, 012076, 2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Performance of the Cold Powered Diodes and Diode Leads in the Main Magnets of the LHC

AU - Willering, Gerard

AU - Giloux, C

AU - Bajko, M

AU - Bednarek, M

AU - Bottura, L

AU - Charifoulline, Zinour

AU - Dahlerup-Petersen, Knud

AU - Dib, G

AU - D'Angelo, G

AU - Gharib, A

AU - Grand-Clement, L

AU - Bermudez, S I

AU - Prin, H

AU - Roger, Victor

AU - Rowan, Scott

AU - Savary, F

AU - Tock, Jean-Phillipe

AU - Verweij, Arjan

PY - 2015

Y1 - 2015

N2 - During quench tests in 2011 variations in resistance of an order of magnitude were found in the diode by-pass circuit of the main LHC magnets. An investigation campaign was started to understand the source, the occurrence and the impact of the high resistances. Many tests were performed offline in the SM18 test facility with a focus on the contact resistance of the diode to heat sink contact and the diode wafer temperature. In 2014 the performance of the diodes and diode leads of the main dipole bypass systems in the LHC was assessed during a high current qualification test. In the test a current cycle similar to a magnet circuit discharge from 11 kA with a time constant of 100 s was performed. Resistances of up to 600 µΩ have been found in the diode leads at intermediate current, but in general the high resistances decrease at higher current levels and no sign of overheating of diodes has been seen and the bypass circuit passed the test. In this report the performance of the diodes and in particular the contact resistances in the diode leads are analysed with available data acquired over more than 10 years from acceptance test until the main dipole training campaign in the LHC in 2015.

AB - During quench tests in 2011 variations in resistance of an order of magnitude were found in the diode by-pass circuit of the main LHC magnets. An investigation campaign was started to understand the source, the occurrence and the impact of the high resistances. Many tests were performed offline in the SM18 test facility with a focus on the contact resistance of the diode to heat sink contact and the diode wafer temperature. In 2014 the performance of the diodes and diode leads of the main dipole bypass systems in the LHC was assessed during a high current qualification test. In the test a current cycle similar to a magnet circuit discharge from 11 kA with a time constant of 100 s was performed. Resistances of up to 600 µΩ have been found in the diode leads at intermediate current, but in general the high resistances decrease at higher current levels and no sign of overheating of diodes has been seen and the bypass circuit passed the test. In this report the performance of the diodes and in particular the contact resistances in the diode leads are analysed with available data acquired over more than 10 years from acceptance test until the main dipole training campaign in the LHC in 2015.

UR - http://iopscience.iop.org/journal/1757-899X

U2 - 10.1088/1757-899X/101/1/012076

DO - 10.1088/1757-899X/101/1/012076

M3 - Article

VL - 101

JO - IOP Conference Series: Materials Science and Engineering

T2 - IOP Conference Series: Materials Science and Engineering

JF - IOP Conference Series: Materials Science and Engineering

SN - 1757-8981

M1 - 012076

ER -