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| THP64 |
Waveguide Stub Tuner Analysis for CEBAF Application
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757 |
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- H. Wang
Jefferson Lab, Newport News, Virginia
- M. Tiefenback
TJNAF, Newport News, Virginia
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Three-stub WR650 waveguide tuners have been used on the CEBAF superconducting cavities for two changes on the external Qs: increasing the Q from 6·106 to 8·106 on 5-cell cavities to reduce the klystron power at operation gradients and decreasing the Q from 2·107 to 8·106 on 7-cell cavities to ease the control system handling the Lorenz Force detuning. To understand the reactive tuning effects in the machine operations with beam current and mechanical tuning, a network analysis model was developed. The S parameters of the stub tuner were simulated by MAFIA and measured on the bench. We used this stub tuner model to study tuning range, sensitivity, frequency pulling as well as cold waveguide and window heating problems. Detailed experimental results will be compared against this model. Pros and cons of this stub tuner application will be summarized.
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