Author: Parajuli, I.P.
Paper Title Page
MOPMB036 Magnetic Field Mapping of a Large-Grain 1.3 GHz Single-Cell Cavity 172
 
  • I.P. Parajuli, J.R. Delayen, A.V. Gurevich
    ODU, Norfolk, Virginia, USA
  • G. Ciovati
    JLab, Newport News, Virginia, USA
  
  Funding: This work was supported by the National Science Foundation under Grant No. PHY 100614-010. G.C. is supported by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
A new mag­netic field map­ping sys­tem for 1.3 GHz sin­gle-cell cav­i­ties was de­vel­oped in order to re­veal the im­pact of am­bi­ent mag­netic field and tem­per­a­ture gra­di­ents dur­ing cool-down on the flux trap­ping phe­nom­e­non. Mea­sure­ments were done at 2 K for dif­fer­ent cool-down con­di­tions of a large-grain cav­ity be­fore and after 120 °C bake. The frac­tion of ap­plied mag­netic field trapped in the cav­ity walls was ~ 50% after slow cool-down and ~20% after fast cool-down. The re­sults showed a weak cor­re­la­tion be­tween be­tween trapped flux lo­ca­tions and hot-spots caus­ing the high-field Q-slope. The re­sults also showed an in­crease of the trapped flux at the quench lo­ca­tion, after quench­ing, and a local re­dis­tri­b­u­tion of trapped flux with in­creas­ing RF field. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB036  
About • Received ※ 15 June 2023 — Revised ※ 23 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 05 July 2023
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