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Title: A cable-scale experiment to explore new materials for optimizing superconductor accelerator magnets

Journal Article · · Cryogenics

We discuss a previously commissioned system for exploring critical current pressure sensitivity in superconducting cables, the Transverse Pressure Insert, was modified to examine signals resulting from strand motion and insulation/impregnation cracking in a fully-excited Nb3Sn single strand embedded in an insulation wrapped and impregnated Cu dummy Rutherford cable stack. Measurements were performed in LHe with cyclic transverse pressures up to 68.5 MPa and transverse applied fields up to 13 T. Pressure was applied and removed to simulate stresses seen during magnet operation. Voltage and acoustic signal traces from a CTD-101 K impregnated cable stack were compared to those of a sample impregnated with NHMFL Mix–61. The experiments in this document were in the pursuit of developing a smaller scale, lower cost, and shorter turn around time experiment for exploring materials and processes to decrease training in next-generation Nb3Sn accelerator magnets.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1599624
Report Number(s):
FERMILAB-PUB-20-058-TD; oai:inspirehep.net:1777564; TRN: US2103490
Journal Information:
Cryogenics, Vol. 106, Issue C; ISSN 0011-2275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (5)

Design, Construction, and Test of HTS/LTS Hybrid Dipole journal April 2018
Acoustic thermometry for detecting quenches in superconducting coils and conductor stacks journal January 2017
Axial-Field Magnetic Quench Antenna for the Superconducting Accelerator Magnets journal June 2015
Superconductor requirements and characterization for high field accelerator magnets conference May 2015
Identification of quench origins in a superconductor with acoustic emission and voltage measurements journal July 1981

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