| Paper | Title | Other Keywords | Page |
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| MOIBA01 | Research on Beam Dynamics of a 2 GeV 6 MW Isochronous FFA | resonance, focusing, cyclotron, space-charge | 4 |
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Funding: This work was supported in part by the National Natural Science Foun-dation of China under Grant 12135020. CIAE has proposed an innovative design for a 2 GeV/6 MW isochronous FFA in 2019. This study aims to present the results of beam dynamics research, demonstrating the feasibility to accelerate the intense proton beam with the energy beyond 1 GeV limitation of isochronous cyclotrons. By introducing 1st - 3rd radial gradient of peak magnetic field to simulate the quadrupole to octupole component of the isochronous machine, three different lattice designs are obtained. Adjusting the radial gradient of the peak field allows an option to avoid or cross integer resonances. Various inherent and coupled resonances are investigated subsequently, with a focus on the destructive effects of the Vr=3 on the transverse phase space. Based on PIC method, we simulate the vortex motion caused by space charge in a large-scale alternating gradient field. Results indicated that the radial size of beam is ~ 10 mm, which is expected to be improved after considering the effects of neighboring bunches. Additionally, high-Q RF cavities and precession extraction further enlarge the turn separation to 30 mm, ensuring efficient beam extraction in the extraction region. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOIBA01 | ||
| About • | Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 02 October 2023 | ||
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| MOCYA01 | Study of the Key Physics Problems in 10mA-class High Current Cyclotron | cyclotron, resonance, neutron, cavity | 9 |
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Funding: National Natural Science Foundation of China (Grant No. 12105370) and the Scientific Research Program for Young Talent Elite Project of China National Nuclear Corporation (Grant No. FY212406000404). Proton beam with an average current of 10mA has many important applications in particle physics towards the intensity frontier, as well as in the advanced energy and material science. At present, superconducting linac is the mainstream of high current accelerator. As cyclotron has advantages of continuous beam structure, high beam/grid efficiency(60%~65% can be expected in superconducting ring cyclotron) and lower cost, cyclotron is also a potential candidate for future accelerator scheme with beam current of 10mA-class. Firstly, we will discuss the application prospect and motivation of 10mA-class high power cyclotron(10mA-HPC). Secondly, the key physics problems of 10mA-HPC are summarized, which includes strong space charge problems in low energy region, integer resonance crossing problems in high energy region and beam losses problems in extraction region. Thirdly, possible solutions for key physics problems and preliminary design of 10mA-HPC are proposed. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOCYA01 | ||
| About • | Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 30 May 2024 | ||
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| TUPB018 | The Design of Nonlinear Regenerative Extraction in 250MeV Protron Superconducting Synchrocyclotron | synchro-cyclotron, cyclotron, proton, simulation | 123 |
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| The objective of this article is to apply the regenerative extraction system to a 250MeV proton superconducting synchrocyclotron. The parameters of the regenerative extraction system are determined by iteratively calculating the appropriate magnetic field and particle trajectory in the region where the magnetic field and particle trajectories interact. This is then combined with the magnetic channel system to achieve the extraction of the beam from the accelerator. In the article, the particle orbit dynamics analysis and the design of relevant parameters for the regenerative extraction system were successfully implemented using Matlab programming. The simulation results showed that the stability in the vertical direction has the greatest impact on the extraction efficiency and determination of the regenerative magnetic field parameters. In order to maximize the particle extraction efficiency, the radial displacement of particles in the last few turns should pass through two identical nodes. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB018 | ||
| About • | Received ※ 09 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 04 July 2024 | ||
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| TUPB021 | The Design of a Proton-Heavy Ion Hybrid Synchrotron Upgraded from XiPAF Proton Ring | injection, proton, synchrotron, heavy-ion | 129 |
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| Xi’an 200MeV Proton Application Facility (XiPAF) has been basically completed at the end of 2020, providing proton beams of 10 to 200 MeV for space radiation effect studies on electronics. To expand its capabilities, XiPAF is undergoing an upgrade to deliver multiple ion species, from proton to Bismuth ion. The upgrade focuses on three aspects. First, the original negative hydrogen linear injector will be remodeled to a proton linear injector. Second, a heavy ion linear injector will be added. Third, the existing proton ring will be retrofitted into a hybrid proton-heavy ion synchrotron. Correspondingly, the beam transport lines will also be modified. This paper details the considerations and physical designs for upgrading the synchrotron. Within the scope, we discuss the challenges and solutions in transforming a specialized proton synchrotron into a multi-ion accelerator under the constraints of existing plant layout and reuse of existing equipment. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB021 | ||
| About • | Received ※ 29 June 2023 — Revised ※ 09 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 20 September 2024 | ||
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| TUPB026 | Design of a Synchrotron for Proton FLASH Radiotherapy Based on Fast Variable-Energy Bunch Splitting | proton, synchrotron, kicker, radiation | 141 |
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| Ultra-high dose rate (FLASH) radiotherapy not only guarantees effective tumor treatment but also greatly enhances the protection of normal tissue. Moreover, it is a convenient procedure for tumor patients that has enhanced the benefits provided by medical institutions. Proton FLASH radiotherapy, which combines the Bragg peak effect of proton spatial dose distribution with the unique temporal effect advantage of FLASH, is an attractive tumor treatment approach. To achieve proton FLASH discrete pencil beam scanning in a 1-L volume, taking into account the 5-mm point interval, 9261 points would need to be irradiated within 500 ms, which is beyond the capability of existing medical devices. To meet these requirements, based on a fast cycle synchrotron with a period of 25 Hz, we simultaneously combined variable-energy, fast splitting, and extraction beam bunches, and proposed a scanning method suitable for continuous variable-energy extraction bunches. The proposed technique meet the requirements of proton FLASH discrete pencil beam scanning within a volume of 1 L. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB026 | ||
| About • | Received ※ 29 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 28 May 2024 | ||
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