INVESTIGATION OF HOT-SPOTS DUE TO TRAPPED FLUX IN NIOBIUM SUPERCONDUCTING RADIOFREQUENCY CAVITIES*

Conference · Wed May 01 04:00:00 EDT 2024

DOI:https://doi.org/10.18429/JACoW-IPAC2024-WEPS34· OSTI ID:2367552

Dhakal, P. ^[1]; Khanal, B. ^[2]

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

One of the significant sources of residual losses in superconducting radio-frequency cavities is magnetic flux trapped during the cool-down due to the incomplete Messier effect. If the trapped vortices are non-uniformly distributed on the cavity surface, the temperature mapping revealed the ?hotspots? at the location of high density of pinned vortices. Here, we performed a rf test on 1.3 GHz single cell cavity with the combination of the temperature mapping system. The temperature mapping reveled the development of the hot spots with the increase in rf field inside the cavity. When magnetic field is trapped locally on the surface of cavity, the hot-spots strength increase rapidly, showing the direct correlation of vortex induced hot spot and corresponding rf loss.

• 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: 2367552
• Report Number(s): JLAB-ACC-24-4060; DOE/OR/23177-7495
• Country of Publication: United States
• Language: English