REBCO WG meeting

Thursday 15 Jul 2021, 11:00 → 12:20 US/Pacific

• What performances and parameters should the conductor have? How can we make magnets using these conductors? 
• What is the maximum dipole field a REBCO magnet can generate?  
• What is the magnet performance? How does it quench? What is the field quality? 
• Does the magnet performance degrade, e.g., during operation, after thermal cycles? If so, how can we prevent it?  
• How can we characterize the performance for long conductors? 

11:00 → 11:45 Status update

• Subscale common coil
• COMB
• CCT

Speakers: Anis Ben Yahia (Brookhaven National Laboratory), Maxim Martchevskii, Ramesh Gupta (BNL), Reed Teyber (LBNL), Vadim Kashikhin (Fermilab), Vito Lombardo (Fermilab), Xiaorong Wang (LBNL)

• Today we had a record short meeting for about 16 minutes! Nevertheless, some useful notes:
• Subscale common coil:
  • Parts are being modified to address the tolerance issue. 
  • Maxim/Reed will run some tests soon on their sensor and find out whether additional grooves are needed in the hardware for the the subscale common coil.
  • The existing BNL header is capable to accommodate the instrumentation/wiring needs for the subscale common coil test.
• COMB:
  • FNAL sent the short wire sample to ACT this week. The wire is mounted on a holder featuring the compound bend in the COMB design. ACT will bend the sample and FNAL will test the bent sample to confirm if the bending performance is improved with the new procedure introduced at ACT. Let's follow up two weeks from now. 
  • If the bending performance is verified, COMB magnet can proceed with the original design. 
  • There is discussion on the conductor needs for future magnet development. 
• C3:
  • The focus is the subscale version. We defined a nominal radial gap of 20 mils between the layers. LBL is contacting outside vendor to determine the optimal mandrel dimensions before ordering the mandrel materials.  
  • LBL received the second batch of samples from ACT for the impregnation test. The idea is to try room-temperature cured epoxy and check for degradation. The issue is to get some work done with the tight funding...