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Transverse emittance growth caused by space-charge-induced resonance
Physical Review Accelerators and Beams ( IF 1.5 ) Pub Date : 
Takaaki Yasui, Susumu Igarashi, Yoichi Sato, Tadashi Koseki, Kazuhito Ohmi

Transverse emittance growth due to space-charge-induced resonance was studied for high-power beam operation in the J-PARC main ring synchrotron. The turn-by-turn beam sizes were measured near the structure resonance at νx=21 and near the non-structure resonance at νx=22. A clear difference in the emittances was observed. The emittance was observed to grow by 5 times at the operating tune νx=21.10, and by 1.8 times at νx=22.05 in the first 100 turns. The results show the advantage of tuning in the region of νx=22 for high intensity beam operation. The turn-by-turn emittance varied depending on the horizontal tune in the region of νx=21. This indicates that the mechanism of emittance growth is related to the tune spread distribution. The results were satisfactorily reproduced by the simulations of the beam dynamics, including the space-charge effect incorporated via the particle-in-cell algorithm. To reveal the mechanism of the emittance growth, the space-charge effects on the resonances were evaluated by simulations as well as analytical calculations.

中文翻译:

由空间电荷引起的共振引起的横向发射率增长

在J-PARC主环同步加速器中,针对大功率光束工作,研究了由于空间电荷引起的共振而产生的横向发射增长。转向光束的尺寸在结构共振附近进行测量νX=21 并在附近发生非结构共振 νX=22。观察到发射率明显不同。观察到在操作时发射率增长了5倍νX=21.10,并且是1.8倍 νX=22.05在前100个回合中。结果显示了在νX=22用于高强度光束操作。逐行发射的发射率取决于水平区域内的水平调谐νX=21。这表明发射率增长的机理与曲调分布有关。通过光束动力学的模拟令人满意地再现了结果,包括通过粒子内算法引入的空间电荷效应。为了揭示发射率增长的机理,通过模拟和分析计算评估了空间电荷对共振的影响。
更新日期:2020-06-02
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