Speaker
Shrikant Pattalwar
(STFC Daresbury Laboratory, UK)
Description
A liquid helium cryostat has been developed for the measurement of surface resistance of thin-film coated SRF cavities at high frequencies (7.8 GHz). The technique is based on the measurement of RF power absorbed in the coated film using calorimetry.
The thin film substrate forms the lower end of a pillbox-like cavity, which is separated from the upper-half of the cavity by a vacuum gap. This gives good thermal isolation between the sample and the rest of the cavity body and facilitates quick and easy replacement of the samples mounted on a cradle which is assembled and prepared in a clean room environment. This paper describes the cryostat design in detail with some initial results.
Author
Shrikant Pattalwar
(STFC Daresbury Laboratory, UK)
Co-authors
Mr
Edward Jordan
(STFC Daresbury Laboratory)
Oleg Malyshev
(STFC Daresbury Laboratory)
Dr
Philippe Goudeket
(STFC Darsbury Laboratory)
Dr
Reza Valizadeh
(STFC Daresbury Laboratory)
Mr
Thomas Jones
(STFC Daresbury Laboratory)
