NDLI: Consolidation of the 13 kA Interconnects in the LHC for Operation at 7 TeV

Content Provider	IEEE Xplore Digital Library
Author	Verweij, A.P. Bertinelli, F. Lasheras, N. Charifoulline, Z. Denz, R. Fessia, P. Garion, C. ten Kate, H.H.J. Koratzinos, M. Mathot, S. Perin, A. Scheuerlein, C. Sgobba, S. Steckert, J. Tock, J.-P. Willering, G.P.
Copyright Year	2002
Abstract	The accident in the LHC in September 2008 occurred in an interconnection between two magnets of the 13 kA dipole circuit. Successive measurements of the resistance of other interconnects revealed other defective joints, even though the SC cables were properly connected. These defective joints are characterized by a poor bonding between the SC cable and the copper stabilizer in combination with an electrical discontinuity in the copper stabilizer. A quench at the 7-13 kA level in such a joint can lead to a fast and unprotected thermal run-away and hence opening of the circuit. It has therefore been decided to operate the LHC at a reduced and safe current of 6 kA corresponding to 3.5 TeV beam energy until all defective joints are repaired. A task force is reviewing the status of all electrical joints in the magnet circuits and preparing for the necessary repairs. The principle solution is to resolder the worst defective joints and, in addition, to apply an electrical shunt made of copper across all joints with sufficient cross-section to guarantee safe 12-13 kA operation at 7-7.5 TeV. In this paper the various actions that have lead to this solution are presented.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2376
Ending Page	2379
Page Count	4
File Size	329162
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Joints Resistance Large Hadron Collider Electrical resistance measurement Superconducting magnets Current measurement Soldering soldering Busbars interconnections resistance
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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