[Acc_sem_comm] [EXTERNAL] Accelerator Seminar: Frank Marhauser 7/16/2020 11 am

[Tristan Jones via BlueJeans Network]

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Meeting ID: 296 666 042

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Meeting ID: 296 666 042
Description:
A Method for In-Situ and In-Operando Cavity Loaded Q-Extraction in SRF Accelerators

Abstract:

A new method has been developed that allows extracting the loaded quality factor of SRF cavities at any time during beam operation from acquired control system process parameters without the need of additional measurement equipment. Concurrently it assesses the attenuation in a cavities’ power transmission line for any RF generator to RF cavity mismatch condition, hence
any beam loading condition, and thus can correct calibration inaccuracies of measured forward and reflected power levels. 
The described method has been applied first for all SRF cavities in operation at CEBAF using archived process variables. 
The beneficial use of the method as a diagnostic tool is demonstrated for a finite number of cavities with surprising revelations. Recommendations are provided that could help improving CEBAF operation and its power efficiency.

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