Speaker
Description
Firmware for the Low-level Radiofrequency (LLRF) systems used in the Jefferson Lab C100 and C75 cryomodules was upgraded to allow for a variable duty factor pulsed mode operation with triggered waveforms available through EPICS. A new type of gaseous helium flow meter that has been under development for the past 2 years was also opportunistically installed in cryogenic return U-tubes of 14 of the cryomodules that were cycled to room temperature during the Spring 2023 accelerator down. These flow meters were developed under an SBIR project* with Hyperboloid LLC. Stub tuners were also adjusted to improve the loaded-Q of the cavities for better klystron operation range. The combination of these activities allowed for re-commissioning of recently plasma processed cavities with pulsed and continuous wave (CW) Self-Excited Loop with Amplitude and Phase locked (SELAP) gradients measured via the LLRF system. Newly developed software also allowed us to measure Qos with the installed flow meters.
Funding Agency
Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
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