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Title: Progress in the Long $${\rm Nb}_{3}{\rm Sn}$$ Quadrupole R&D by LARP

After the successful test of the first long Nb3Sn quadrupole (LQS01) the US LHC Accelerator Research Program (LARP, a collaboration of BNL, FNAL, LBNL and SLAC) is assessing training memory, reproducibility, and other accelerator quality features of long Nb3Sn quadrupole magnets. LQS01b (a reassembly of LQS01 with more uniform and higher pre-stress) was subjected to a full thermal cycle and reached the previous plateau of 222 T/m at 4.5 K in two quenches. A new set of four coils, made of the same type of conductor used in LQS01 (RRP 54/61 by Oxford Superconducting Technology), was assembled in the LQS01 structure and tested at 4.5 K and lower temperatures. The new magnet (LQS02) reached the target gradient (200 T/m) only at 2.6 K and lower temperatures, at intermediate ramp rates. The preliminary test analysis, here reported, showed a higher instability in the limiting coil than in the other coils of LQS01 and LQS02.
Authors:
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  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
OSTI Identifier:
1033677
Report Number(s):
FERMILAB-PUB-11-432-TD
Journal ID: ISSN 1051-8223; TRN: US1200593
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 22; Journal Issue: 3; Conference: Presented at 22nd International Conference on Magnet Technology (MT-22), Marseille, France, 12-16 Sep 2011; Journal ID: ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
LARP Collaboration
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATORS; INSTABILITY; NIOBIUM BASE ALLOYS; QUADRUPOLES; RESEARCH PROGRAMS; SUPERCONDUCTING COILS; SUPERCONDUCTING MAGNETS; SUPERCONDUCTORS; TEMPERATURE RANGE 0000-0013 K; TESTING; TIN ALLOYS NbS3Sn, ACCELERATORS, LHC Accelerator Research Program (LARP)