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{maradia:ipac2022-thpoms024,
author = {V. Maradia and A.L. Lomax and D. Meer and S. Psoroulas and D.C. Weber},
title = {{A Novel Intensity Compensation Method to Achieve Energy Independent Beam Intensity at the Patient Location for Cyclotron Based Proton Therapy Facilities}},
booktitle = {Proc. IPAC'22},
% booktitle = {Proc. 13th International Particle Accelerator Conference (IPAC'22)},
pages = {3004--3006},
eid = {THPOMS024},
language = {english},
keywords = {cyclotron, proton, optics, emittance, beam-losses},
venue = {Bangkok, Thailand},
series = {International Particle Accelerator Conference},
number = {13},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {07},
year = {2022},
issn = {2673-5490},
isbn = {978-3-95450-227-1},
doi = {10.18429/JACoW-IPAC2022-THPOMS024},
url = {https://jacow.org/ipac2022/papers/thpoms024.pdf},
abstract = {{In cyclotron-based proton therapy facilities, an energy selection system is typically used to lower beam energy from the fixed value provided by the accelerator (250/230MeV) to the one needed for the treatment (230-70MeV). Such a system has drawback of introducing an energy-dependent beam current at the patient location, resulting in energy-dependent beam intensity ratios of about 10³ between high and low energies. This complicates treatment delivery and challenges patient safety systems. As such, we propose the use of a dual-energy degrader method that can reduce beam intensity for high-energy beams. The first degrader is made of high Z material and the second is made of low Z material and are placed next to each other. For high energies (230-180MeV), we use only first degrader to increase beam emittance after degrader and thus lose intensity in emittance selection collimators. For intermediate energy beams (180-100MeV) we use the combination of both degraders, whereas for low energy beams (100-70MeV), only the second degrader limits the increase in emittance. With this approach, energy-independent beam intensities can be achieved, whilst localizing beam losses around the degrader.}},
}