Speaker
Description
We have developed a new RF measurement and on-line data processing techniques aimed at to do an in-situ unloaded Qo measurement on each Superconducting Radio Frequency (SRF) cavity at CEBAF without a beam loading. Based on previous developed RF measurement formulas and the I/Q data processing by linear regression process and analytical correction on the mismatch of drive circuit, calibration on the cross-talk of directional coupler, we have improved the coupled circuit’s loaded Q, cavity detune and coupling betas' measurement accuracy. By an independent beam-based shunt impedance measurement by the CEBAF recirculation arc spectrometry, we should be able to reduce the Q0 measurement error to be less than 10%. We are going to report our in-situ measurement and data analysis progress starting with this technique at the Vertical Test Area (VTA) and later at CEBAF, so the result comparison with standard RF calibration/decay method, superconducting wire calorimetric method as well as the RF heat replacement method will be presented.
Funding Agency
Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No.
DE-AC05-06OR23177
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