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{yang:cyclotrons2022-mopo016,
author = {F.D. Yang and X.L. Fu and T.Y. Jiang and X. Mu and Y. Wang and Z.G. Yin and T.J. Zhang},
% author = {F.D. Yang and X.L. Fu and T.Y. Jiang and X. Mu and Y. Wang and Z.G. Yin and others},
% author = {F.D. Yang and others},
title = {{Control of Cyclotron Vertical Deflector for Proton Therapy}},
% booktitle = {Proc. CYCLOTRONS'22},
booktitle = {Proc. 23rd Int. Conf. Cyclotrons Appl. (CYCLOTRONS'22)},
pages = {95--98},
paper = {MOPO016},
language = {english},
keywords = {controls, cyclotron, proton, FPGA, high-voltage},
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-MOPO016},
url = {https://jacow.org/cyclotrons2022/papers/mopo016.pdf},
abstract = {{China Institute of Atomic Energy (CIAE) has designed a superconducting cyclotron CYCIAE-230 to enhance the domestic development of proton therapy. A research program on the beamline and experimental stations for the proton therapy and the space science was launched by China National Nuclear Corporation (CNNC). The modern therapy methodology often requires rapid beam modulation on both the beam energy and the intensity. In this scenario, a vertical deflector is designed and installed in the cyclotron’s central region. Applying a high-voltage electric field between the two plates can quickly adjust the intensity of the low-energy beam. Nevertheless, the voltage applied is nonlinear to the beam intensity. According to this requirement, a homemade controller for the vertical deflector is designed. Since the beam loss caused by the energy degrader is also nonlinear, this controller can compensate for the beam loss caused by energy modulation. To realize real-time control, the controller combines Field Programmable Gate Array (FPGA) and Digital Signal Process (DSP) as its control scheme design. Carried out by the DSP by interpolating the lookup table data, a feed-forward regulation is also designed to take care of the nonlinear compensation for the beam loss on the energy degrader. In the meantime, an ionized chamber provides feedback readings of the intensity just before the nozzle. A PID algorithm is also included by using FPGA, to archive the feedback control of the vertical deflector.}},
}