NDLI: Heat Extraction From the LHC Main Dipole, Main Quadrupole, and MQXA Superconducting Cables

Content Provider	IEEE Xplore Digital Library
Author	Granieri, P.P. Santandrea, D. Koettig, T. van Weelderen, R.
Copyright Year	2002
Abstract	The forthcoming operation of the CERN Large Hadron Collider (LHC) at 13-14 TeV requires a deep understanding of the heat transfer mechanisms in the most critical superconducting magnets. This is aimed at determining their steady-state quench limits and constitutes an input to compute the magnets stability in transient conditions as well, to prevent beam induced quenches. Heat extraction capability of the LHC Nb-Ti magnets relies on the significant contribution provided by superfluid helium (He II). Due to lack of knowledge of the He II distribution in the cable and in the compressed insulation, experimental investigations are necessary. In this work we present an experimental study aimed at reproducing the thermal behavior of superconducting coils using short length samples. With respect to previous studies, a new instrumentation technique was developed and an in-situ calibration of the thermocouples was performed. The study was conducted on different types of instrumented cables-stack reproducing the main bending dipole (MB), the main quadrupole (MQ), and the MQXA, which is one of the two low-β interaction region quadrupoles. The heat extraction was determined as a function of the cable temperature, of the bath temperature and of the beam loss scenario.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	766180
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Helium Cable insulation Large Hadron Collider Superconducting magnets Temperature measurement Temperature sensors superfluid helium Electrical insulation heat transfer LHC Nb-Ti superconducting magnets
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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