Speaker
Description
We report on the easily accomplished, in situ measurement of individual SRF Cavity dissipation in CEBAF cryomodules at the Thomas Jefferson National Accelerator Facility (JLab). Calculated Q0s from the data allows assessing the health of cryomodules over time. A 2022 SBIR Grant from the Office of Nuclear Physics, DOE Office of Science, to Hyperboloid LLC enabled development. JLab provided the test bed environment and development of electronics through a cooperative agreement. Use of the flowmeter for determining the Q0s of LCLS-II-HE cryomodules built at JLab as well as results from other installations are also reported. The meter measures the helium vapor evaporating from the 2 K helium bath at 1/30 atm, resolving 0.05 g/s = 1 W. As a power meter, it has a broad range, measuring from 10 W to 200 W. The meter’s sensitivity uses voltage signal change when the superconductor (SC) sensor (Tc = 9.2 K) changes to normal conducing. Cooling from helium vapor is bucked against resistive heat from an adjacent resistive wire until the sensor’s temperature is non-SC. An electronics chassis interfaced to an AtoD/DtoA LabJack T7 couples to Linux-based EPICS, providing control and data processing of the signals. The Hyperboloid flowmeter is now a commercial instrument, available to the SRF community.
Funding Agency
US DOE Office of Science, Office of Nuclear Physics, SBIR Grant #DE-SC0022380
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