Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF
IntroductionTo ensure the safety and efficacy of precise proton therapy, real-time and non-intrusive monitoring of the clinical beam position is essential. However, in cyclotron-based proton therapy facilities, clinical proton beams with low repetition frequency and exceptionally low intensity due t...
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Frontiers Media S.A.
2025-06-01
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| Series: | Frontiers in Oncology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fonc.2025.1508361/full |
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| author | Jiqing Li Yuexin Lu Jiapeng Li Jian Wang Zhengzheng Liu Oleg Meshkov Jinfeng Yang Kuanjun Fan |
| author_facet | Jiqing Li Yuexin Lu Jiapeng Li Jian Wang Zhengzheng Liu Oleg Meshkov Jinfeng Yang Kuanjun Fan |
| author_sort | Jiqing Li |
| collection | DOAJ |
| description | IntroductionTo ensure the safety and efficacy of precise proton therapy, real-time and non-intrusive monitoring of the clinical beam position is essential. However, in cyclotron-based proton therapy facilities, clinical proton beams with low repetition frequency and exceptionally low intensity due to the Energy Selection Systems (ESS), pose considerable challenges for accurate online beam diagnostics. Conventional non-interceptive beam diagnostic devices lack the sensitivity required to detect such weak beams with sufficient precision.MethodsThis paper presents an innovative solution to this challenge: an off-centerrectangular cavity Beam Position Monitor (BPM) with dielectric loading. This novel design achieves remarkable position sensitivity while maintaining compact transverse dimensions of 500×250×100 mm.ResultsA prototype of this cavity has been fabricated and tested offline. Experimental results demonstrate that, within the clinical treatment energy range, the BPM achieves minimum beam position measurement sensitivities of 0.49 nV/mm at 70 MeV and 17.12 nV/mm at 230 MeV. In addition to enabling online beam position monitoring without disturbing the beam path, which ensures real-time beam orbit feedback correction with submillimeter stability (± 0.5 mm).DiscussionIn addition to monitoring beam positions for precise control of the beam orbit, the BPMs could serve additional functions to enhance proton therapy—such as enabling beam energy verification through the phase of the BPM signal. |
| format | Article |
| id | doaj-art-4a71b1550e4a4e5491cc6ffda66351c3 |
| institution | Kabale University |
| issn | 2234-943X |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Oncology |
| spelling | doaj-art-4a71b1550e4a4e5491cc6ffda66351c32025-08-20T03:32:15ZengFrontiers Media S.A.Frontiers in Oncology2234-943X2025-06-011510.3389/fonc.2025.15083611508361Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTFJiqing Li0Yuexin Lu1Jiapeng Li2Jian Wang3Zhengzheng Liu4Oleg Meshkov5Jinfeng Yang6Kuanjun Fan7State Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaBudker Institute of Nuclear Physics SB RAS, Novosibirsk, RussiaInstitute of Scientific and Industrial Research, Osaka University, Osaka, JapanState Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, ChinaIntroductionTo ensure the safety and efficacy of precise proton therapy, real-time and non-intrusive monitoring of the clinical beam position is essential. However, in cyclotron-based proton therapy facilities, clinical proton beams with low repetition frequency and exceptionally low intensity due to the Energy Selection Systems (ESS), pose considerable challenges for accurate online beam diagnostics. Conventional non-interceptive beam diagnostic devices lack the sensitivity required to detect such weak beams with sufficient precision.MethodsThis paper presents an innovative solution to this challenge: an off-centerrectangular cavity Beam Position Monitor (BPM) with dielectric loading. This novel design achieves remarkable position sensitivity while maintaining compact transverse dimensions of 500×250×100 mm.ResultsA prototype of this cavity has been fabricated and tested offline. Experimental results demonstrate that, within the clinical treatment energy range, the BPM achieves minimum beam position measurement sensitivities of 0.49 nV/mm at 70 MeV and 17.12 nV/mm at 230 MeV. In addition to enabling online beam position monitoring without disturbing the beam path, which ensures real-time beam orbit feedback correction with submillimeter stability (± 0.5 mm).DiscussionIn addition to monitoring beam positions for precise control of the beam orbit, the BPMs could serve additional functions to enhance proton therapy—such as enabling beam energy verification through the phase of the BPM signal.https://www.frontiersin.org/articles/10.3389/fonc.2025.1508361/fullproton therapybeam position monitorcavityshunt impedanceoff-centerdielectric loading |
| spellingShingle | Jiqing Li Yuexin Lu Jiapeng Li Jian Wang Zhengzheng Liu Oleg Meshkov Jinfeng Yang Kuanjun Fan Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF Frontiers in Oncology proton therapy beam position monitor cavity shunt impedance off-center dielectric loading |
| title | Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF |
| title_full | Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF |
| title_fullStr | Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF |
| title_full_unstemmed | Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF |
| title_short | Development of a compact cavity BPM for real-time monitoring of clinical proton beams at HUST-PTF |
| title_sort | development of a compact cavity bpm for real time monitoring of clinical proton beams at hust ptf |
| topic | proton therapy beam position monitor cavity shunt impedance off-center dielectric loading |
| url | https://www.frontiersin.org/articles/10.3389/fonc.2025.1508361/full |
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