JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{chang:srf2021-thptev002, author = {W. Chang and W. Hartung and S.H. Kim and J.T. Popielarski and T. Xu and C. Zhang and S. Zhao}, % author = {W. Chang and W. Hartung and S.H. Kim and J.T. Popielarski and T. Xu and C. Zhang and others}, % author = {W. Chang and others}, title = {{Enhanced Pneumatic Tuner Control for FRIB Half-Wave Resonators}}, booktitle = {Proc. SRF'21}, % booktitle = {Proc. 20th International Conference on RF Superconductivity (SRF'21)}, pages = {829--831}, eid = {THPTEV002}, language = {english}, keywords = {controls, cavity, solenoid, cryomodule, feedback}, venue = {East Lansing, MI, USA}, series = {International Conference on RF Superconductivity}, number = {20}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2022}, issn = {2673-5504}, isbn = {978-3-95450-233-2}, doi = {10.18429/JACoW-SRF2021-THPTEV002}, url = {https://jacow.org/srf2021/papers/thptev002.pdf}, abstract = {{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.}}, }