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Longitudinal instability caused by long drifts in the C-ADS injector- I
Li ZH(李智慧); Tang JY(唐靖宇); Yan F(闫芳); Li, ZH; Tang, JY; Yang, F; Geng, HP; Meng, C; Sun, B; Cheng, P; Guo, Z; Sun, JL; Geng HP(耿会平); Meng C(孟才); Sun B(孙彪); Cheng P(程鹏); Guo Z(郭臻); Sun JL(孙纪磊)
2013
发表期刊CHINESE PHYSICS C
卷号37期号:3页码:37005
摘要The period length is usually much larger than the cavity effective length in a low energy superconducting linac. The long drifts between cavities will not only decrease the acceptance of the linac, but also lead to possible instability. The linac will be more sensitive to mismatch and other perturbations. From the longitudinal motion equation, the function which describes the parametric resonance is deduced and the relation between the instability region and the cavity filling factor is discussed. It indicates that if the zero current phase advance per period is kept below 90 degrees, instability driven by parametric resonance will never occur. The space charge effect will enhance the instability, so that a stricter limitation on the phase advance per cell is required. From the numerical simulation results for two different schemes of Injector-I of the C-ADS driver linac, one can find that even with just three cells in the unstable region, significant emittance growth can be observed. Further investigations show that it is apt to produce halo particles under resonance, and the machine becomes more sensitive to errors and mismatches. Therefore, it is important to keep all cells in the stable region throughout the linac of very high beam power to minimize beam losses.
关键词parametric resonance instability phase advance low energy superconducting linac
学科领域Physics
DOI10.1088/1674-1137/37/3/037005
收录类别SCI
WOS记录号WOS:000320597000017
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224754
专题加速器中心
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GB/T 7714
Li ZH,Tang JY,Yan F,et al. Longitudinal instability caused by long drifts in the C-ADS injector- I[J]. CHINESE PHYSICS C,2013,37(3):37005.
APA 李智慧.,唐靖宇.,闫芳.,Li, ZH.,Tang, JY.,...&孙纪磊.(2013).Longitudinal instability caused by long drifts in the C-ADS injector- I.CHINESE PHYSICS C,37(3),37005.
MLA 李智慧,et al."Longitudinal instability caused by long drifts in the C-ADS injector- I".CHINESE PHYSICS C 37.3(2013):37005.
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