21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

M2Po2E-01 [49]: Assessment of current-sharing of fully-excited Nb3Sn Rutherford cable with modified ICR at 4.2 K using a superconducting transformer

23 Jul 2019, 13:30
Level 6, Cryo Expo Exhibit Hall

Level 6, Cryo Expo Exhibit Hall


Chris Kovacs (The Ohio State University)


Current-sharing was measured for fully-excited Nb3Sn Rutherford cable at 4.2 K and various I/Ic, using a superconducting transformer. Interstrand contact resistance was modified by different preparation conditions: as-is and low temperature vacuum diffusion bonding. Measurements were performed in pool boiling liquid helium in background fields of up to 15 T with magnetic fields applied parallel to the flat face of the cable. Normal-zones were initiated with surface mounted graphite epoxy heaters. Normal-zone formation was monitored using voltage taps and Type-E thermocouples. The results were correlated with interstrand contact resistance values, themselves a function of the cable preparation protocol. These experimental results are discussed in terms of a stability diagram, and interpreted in terms of a model discussing the importance of minimum quench power and different quench behaviors.

Primary author

Chris Kovacs (The Ohio State University)


Mike Sumption (The Ohio State University) Emanuela Barzi (Fermilab) Dr Alexander Zlobin (Fermilab) Milan Majoros (The Ohio State University)

Presentation Materials