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{he:cyclotrons2022-mopo019,
author = {A.L. He and H.R. Cai and Q.K. Guo and P. Huang and Q.Q. Song and Y. Wang and Z.G. Yin and T.J. Zhang and B.H. Zhao},
% author = {A.L. He and H.R. Cai and Q.K. Guo and P. Huang and Q.Q. Song and Y. Wang and others},
% author = {A.L. He and others},
title = {{Optimization of Rapid Magnetic Field Control of the CYCIAE-230 Cyclotron Beamline Magnets}},
% booktitle = {Proc. CYCLOTRONS'22},
booktitle = {Proc. 23rd Int. Conf. Cyclotrons Appl. (CYCLOTRONS'22)},
pages = {106--109},
paper = {MOPO019},
language = {english},
keywords = {controls, proton, experiment, cyclotron, power-supply},
venue = {Beijing, China},
series = {International Conference on Cyclotrons and their Applications},
number = {23},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2023},
issn = {2673-5482},
isbn = {978-3-95450-212-7},
doi = {10.18429/JACoW-CYCLOTRONS2022-MOPO019},
url = {https://jacow.org/cyclotrons2022/papers/mopo019.pdf},
abstract = {{The magnetic field precise and rapid control of the beamline magnets is essential to the Energy Selection System (ESS) for the proton therapy facility. During the scanning of proton beam for therapy, the field of each beamline magnet should be precisely controlled within the set time, layer upon layer. The position of beam spot to the nozzle should undoubtedly be stable and unchanged during the process. In practice, however, due to the wide energy range of proton therapy (70 MeV-230 MeV), the dynamic response of the beamline magnets usually shows nonlinear performances at a different energy, e.g., the magnetic field may cause a significant overshoot for some specific beam energy if one ignores the nonlinear effect. More challenge is that the magnetic field drops too slowly between the energy steps, which compromises the overall performance of rapid intensity modulated scanning therapy. A dynamic PID parameter optimization method is reported in this paper to address this issue. According to the transfer function of each magnet, the entire energy range is divided into several steps. Then, the experiments are carried out to find the most suitable PID parameters for each energy step. Finally, the "beam energy - excitation current-PID parameters" lookup table (LUT) is generated and stored in the beamline control system BCS for automation. During the treatment, using the LUT allows the energy setting for beamline magnets to be adjusted automatically with the most appropriate PID parameter, guaranteeing the overall performance of rapid scanning therapy. The experimental results show the overall response time of all the beamline magnets reduced from several hundred milliseconds to less than 65 ms, which meets the design requirement of less than 80ms.}},
}