Open Access1.9 K HEAT INLEAK AND RESISTIVE HEATING MEASUREMENTS ON LHC CRYOMAGNETS
Author(s) -
G. Ferlin,
S. Claudet,
L. Tavian,
U. Wagner,
J. G. Weisend
Publication year - 2010
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.3422295
Subject(s) - superconducting magnet , nuclear engineering , large hadron collider , magnet , superfluid helium 4 , resistive touchscreen , materials science , helium , temperature measurement , nuclear physics , electrical engineering , physics , environmental science , thermodynamics , engineering , atomic physics
The superconducting magnets of the Large Hadron Collider (LHC) distributed over eight sectors of 3.3-km long are cooled at 1.9 K in pressurized superfluid helium. During the commissioning campaign of the sectors in 2008, cold standby periods at nominal operating temperature have allowed to measure the overall static heat inleaks reaching the magnet cold masses at 1.9 K by enthalpy balance in steady-state operation. In addition, during electrical powering of the different magnet circuits, helium II calorimetry based on precision thermometry has been implemented to assess with an accuracy of 100 mW/m the additional heat loads due to resistive heating and to detect possible abnormal heat dissipation during powering. This paper describes the method applied to perform these measurements, compares the results with the expected specified values and discusses the impact of the measured values on cryo-plant tuning and operational margins
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