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THPTEV002 |
Enhanced Pneumatic Tuner Control for FRIB Half-Wave Resonators |
controls, cavity, solenoid, cryomodule |
829 |
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- W. Chang, W. Hartung, S.H. Kim, J.T. Popielarski, T. Xu, C. Zhang, S. Zhao
FRIB, East Lansing, Michigan, USA
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The superconducting driver linac for the Facility for Rare Isotope Beams (FRIB) includes a total of 46 cryomodules; 31 cryomodules contain half-wave resonators (HWRs) with pneumatic tuners. Pneumatic tuner control is via solenoid valves connecting the tuner to a helium gas supply manifold and a gas return line. For precise compensation of cavity detuning over a small range, the control voltage for the solenoid valves must be calibrated. Some valves have hysteresis in the gas flow rate as a function of control voltage, such that their response may be nonlinear and not repeatable–this makes the control algorithm challenging. To improve the system performance, a new pneumatic tuner control system was developed which regulates the position of one stepper motor instead of the two solenoid valves.
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Poster THPTEV002 [1.325 MB]
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DOI • |
reference for this paper
※ doi:10.18429/JACoW-SRF2021-THPTEV002
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About • |
Received ※ 24 June 2021 — Revised ※ 15 December 2021 — Accepted ※ 17 February 2022 — Issue date ※ 16 May 2022 |
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