PRELIMINARY RESULTS OF MAGNETIC AND TEMPERATURE MAP SYSTEM FOR 3 GHz SUPERCONDUCTING RADIO FREQUENCY CAVITIES

Conference · Sat Jun 25 04:00:00 EDT 2022

DOI:https://doi.org/10.18429/JACoW-IPAC2022-TUPOTK044· OSTI ID:1882209

Parajuli, I. P. ^[1]; Ciovati, G. ^[2]; Delayen, J. R. ^[2]; Gurevich, A. V. ^[1]; Khanal, B. D. ^[1]

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1. Old Dominion Univ., Norfolk, VA (United States)
2. Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Su­per­con­duct­ing radio fre­quency (SRF) cav­i­ties are fun­da­men­tal build­ing blocks of mod­ern par­ti­cle ac­cel­er­a­tors. A sur­face re­sis­tance in the tens of nanoOhm range is achieved when cool­ing these cav­i­ties to liq­uid he­lium tem­per­a­ture, ~2 - 4 K. One of the lead­ing sources of resid­ual losses in SRF cav­i­ties is trapped mag­netic flux. Flux trap­ping mech­a­nism de­pends on dif­fer­ent sur­face prepa­ra­tions and cool-down con­di­tions. We have de­signed, de­vel­oped and com­mis­sioned a com­bined mag­netic and tem­per­a­ture map­ping sys­tem using anisotropic mag­neto-re­sis­tance sen­sors and car­bon re­sis­tors, re­spec­tively, to study the flux trap mech­a­nism in 3 GHz sin­gle-cell nio­bium cav­i­ties. In this con­tri­bu­tion, we will de­scribe the ex­per­i­men­tal ap­pa­ra­tus and pre­sent pre­lim­i­nary test re­sults.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1882209
• Report Number(s): JLAB-ACC-22-3627; DOE/OR/23177-5508
• Country of Publication: United States
• Language: English