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IPAC'26 - the 17th International Particle Accelerator Conference

17–22 May 2026
C.I.D
Europe/Zurich timezone

IPAC'26

Hollow Bunch Method for Improved Spot Dose Accuracy in 3D PBS Proton FLASH

THP5663
21 May 2026, 16:00
2h
C.I.D

C.I.D

Deauville, France
Poster Presentation MC5.D09: Emittance manipulation, Bunch Compression and Cooling Poster session

Speakers

Yang Xiong (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China) Peizhi Fang (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China)

Description

A longitudinal localized kick-driven fast extraction technique has been employed to enable three-dimensional (3D) proton pencil beam scanning (PBS) at ultra-high dose rate (FLASH) for large-volume targets. However, it was observed that the longitudinal line density of the proton bunch significantly influences spot dose accuracy. In this study, a hollow bunch method—implemented by using two harmonic waves to manipulate the longitudinal phase space—is applied to reduce the line density in the extraction region. The RF parameters are carefully chosen so that the evolution of the phase space satisfies the requirements. Simulations conducted with the SynTrack code demonstrate that this method can effectively reduce the line density in the extraction region, thereby offering the potential to improve spot dose accuracy.

Funding Agency

This work was supported by the National Natural Science Foundation of China (No. 12075131).

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Author

Yang Xiong (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China)

Co-authors

hongjuan yao (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China) Peizhi Fang (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China) shuxin zheng (Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, China, Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing, China, Department of Engineering Physics, Tsinghua University, Beijing, China)

Presentation materials

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