CERN Accelerating science

Article
Report number	CERN-ACC-2015-0055
Title	Quench Analysis of High Current Density Nb$_{3}$Sn Conductors in Racetrack Coil Configuration
Author(s)	Bajas, H (CERN) ; Bajko, M (CERN) ; Bordini, B (CERN) ; Bottura, L (CERN) ; Izquierdo Bermudez, S (CERN) ; Feuvrier, J (CERN) ; Chiuchiolo, A (CERN) ; Perez, J C (CERN) ; Willering, G (CERN)
Publication	2015
Imprint	10 Jun 2015
Number of pages	6
In:	IEEE Trans. Appl. Supercond. 25 (2015) 4004005
In:	Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.4004005
DOI	10.1109/TASC.2015.2390297
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Project	CERN HL-LHC
Free keywords	Superconducting coils ; Niobium-tin ; Analytical model
Abstract	The luminosity upgrade of the Large Hadron Collider (HL-LHC) requires the development of new type of superconducting cables based on advanced Nb$_{3}$Sn strands. In the framework of the FP7 European project EUCARD the cables foreseen for the HL-LHC project have been tested recently in a simplified racetrack coil configuration, the so-called Short Model Coil (SMC). In 2013 to 2014, two SMCs wound with 40-strand (RRP 108/127) cables, with different heat treatment processes, reached during training at 1.9 K a current and peak magnetic field of 15.9 kA, 13.9T,and 14.3 kA, 12.7 Trespectively. Using the measured signals from the voltage taps, the behavior of the quenches is analyzed in terms of transverse and longitudinal propagation velocity and hot spot temperature. These measurements are compared with both analytical and numerical calculations from adiabatic models.The coherence of the results from the presented independent methods helps in estimating the relevance of the material properties and the adiabatic assumption for impregnated Nb$_{3}$Sn conductor modelling.

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