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| MOIBA01 | Research on Beam Dynamics of a 2 GeV 6 MW Isochronous FFA | extraction, 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 | ||
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| MOCYA01 | Study of the Key Physics Problems in 10mA-class High Current Cyclotron | cyclotron, extraction, 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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| MOPB017 | Analysis of the Fluctuation of Resonance Driving Terms for Nonlinear Lattice Optimization | sextupole, storage-ring, lattice, controls | 41 |
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| Minimizing resonance driving terms (RDTs) of nonlinear magnets is a traditional approach to enlarge the dynamic aperture (DA) of a storage ring. The local cancellation of nonlinear dynamics, which is adopted by some diffraction-limited storage rings, is more effective than the global cancellation. The former has smaller fluctuation of RDTs along the ring. In this paper, the correlation between two kinds of RDT fluctuations is found. The qualitative analysis shows that minimizing the RDT fluctuations is beneficial for controlling the crossing terms and thus enlarging the DA. This qualitative analysis is supported by the statistical analysis of nonlinear solutions of a double-bend achromat lattice. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB017 | ||
| About • | Received ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 April 2024 | ||
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| TUPB006 | Study on XiPAF Synchrotron Nonlinear Dynamics | synchrotron, space-charge, injection, simulation | 92 |
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Funding: Work supported by National Natural Science Foundation of China (No.12075131) Xi’an Proton Application Facility (XiPAF) has been operational since 2020, which can accumulate 2e11 protons after injection and 1e11 protons after acceleration. In this paper, we have investigated the XiPAF synchrotron nonlinearity by simulation and experiments, the beam loss occurs with resonance vx+2vy=5 in the absence of space charge, and resonance 2vx-2vy=0 in the presence of space charge. The stripping foil also plays an important role due to its multiple scattering effect and ionization energy loss effect. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB006 | ||
| About • | Received ※ 29 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 04 December 2023 | ||
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| TUPB019 | Beam Dynamics in Superconducting Proton Linac | focusing, quadrupole, simulation, acceleration | 126 |
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Funding: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11375122 and 11875197). Beam loss control is a crucial research direction in high-current superconducting linear accelerators (SCL). The research findings include firstly, for continuous beams, when tune depression eta > 0.7, zero current periodic phase advance (σ0t) can partially exceed 90° during transport in solenoid and quadrupole doublet periodic focusing channels. Different results occur when eta < 0.7. Secondly, in the solenoid system, σ0t can partially exceed 90° without significant impact on beam quality. In the quadrupole doublet focusing system, the partial breakdown of 90° affects beam quality. Thirdly, Similar conclusions hold for acceleration effects. Fourthly, numerical analysis shows that double-period structures have more stringent design criteria than fully period structures. The double-period structure can cause envelope instability even if σ0t < 90°. Fifthly, the primary factor causing halo is the 2:1 resonance. Additionally, when eta is small, higher-order resonances can also cause halo. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB019 | ||
| About • | Received ※ 09 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 08 April 2024 | ||
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