Document Type

Poster

Publication Date

2011

Publication Title

15th International Conference on RF Superconductivity (SRF 2011)

Pages

thpo016

Conference Name

15th International Conference on RF Superconductivity (SRF 2011), 25-29 July 2011, Chicago, Illinois

Abstract

Magnetic vortices pinned near the inner surface of SRF Nb cavities are a possible source of RF hotspots, frequently observed by temperature mapping of the cavities outer surface at RF surface magnetic fields of about 100 mT. Theoretically, we expect that the thermal gradient provided by a 10 W green laser shining on the inner cavity surface at the RF hotspot locations can move pinned vortices to different pinning locations. The experimental apparatus to send the beam onto the inner surface of a photoinjector-type large-grain Nb cavity is described. Preliminary results on the changes in thermal maps observed after applying the laser heating are also reported.

Rights

This work is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) License. 

Comments

Alternate title: "Preliminary results on the laser heating investigation of hotspots in a large-grain Nb cavity"

Report number: JLAB-ACC--11-1449; Country: United States

Original Publication Citation

Ciovati, G., Gurevich, A., Baldwin, C., Jordan, K., Kneisel, P., Zhang, S., Nemes, G., Morrone, M., Anlage, S., Turlington, L., Wilson, K., & Cheng, G. (2011). Breaking and moving hotspots in a large grain Nb cavity with a laser beam. 15th International Conference on RF Superconductivity (SRF 2011), Chicago, Illinois. https://misportal.jlab.org/sti/publications/10460

ORCID

0000-0001-9316-7704 (Ciovati), 0000-0003-0759-8941 (Gurevich)

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