IPAC'25 - the 16th International Particle Accelerator Conference

RF heating and dark current at cryogenic temperature

TUPS104

3 Jun 2025, 16:00

2h

Exhibiton Hall A _Salmon (TWTC)

Poster Presentation MC3.A15 New Acceleration Concepts and Techniques Tuesday Poster Session

Speaker

Gerard Lawler (University of California, Los Angeles)

Description

Stable peak surface electric fields in excess of 200 MV/m are achievable at cryogenic temperatures in test cavities due to emprical reductions in RF breakdown rates. In order to fully capitalize on these effects, the complex physics at RF cavity interfaces in extreme conditions must be further understood from a basic physics perspective. Even before the onset of RF breakdown several precursor phenomena such as electron emission and RF pulse heating become relevant. To this end we present models for temperature dependent dark current and RF pulse heating focusing on temperatures between 40 and 80 K at peak fields between 100 and 200 MV/m. The models are semi-empirical and where relevant reference will be made to data collected at the CrYogenic Brightness Optimized Radio frequency Gun (CYBORG) at UCLA.