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RRP Nb3 Sn Strand Studies for LARP

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7 Author(s)
Barzi, E. ; Fermi Nat. Accelerator Lab., Batavia ; Bossert, R. ; Caspi, S. ; Dietderich, D.R.
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The NbSn strand chosen for the next step in the magnet R&D of the U.S. LHC Accelerator Research Program is the 54/61 sub-element Restacked Rod Process by Oxford Instruments, Superconducting Technology. To ensure that the 0.7 mm RRP strands to be used in the upcoming LARP magnets are suitable, extensive studies were performed. Measurements included the critical current, Ic, using the voltage-current (V-I)method, the stability current, IS, as the minimal quench current obtained with the voltage-field (V-H) method, and RRR. Magnetization was measured at low and high fields to determine the effective filament size and to detect flux jumps. Effects of heat treatment temperature and durations on Ic and IS were also studied. Using strand billet qualification and tests of strands extracted from cables, the short sample limits of magnet performance were obtained. The details and the results of this investigation are herein described.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:17 ,  Issue: 2 )

Date of Publication:

June 2007

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