Beam-ion instability and its mitigation with feedback system
Beam-ion instability and its mitigation with feedback system
复制标题
束离子不稳定性及其反馈系统的缓解
DOI：
10.1103/physrevaccelbeams.23.074401
复制
发表时间：
2019-11
影响因子：
1.7
通讯作者：
Xu Haisheng
中科院分区：
文献类型：
--
作者：
Li Chao;Tian Saike;Wang Na;Xu Haisheng
在电子加速器中，束流与离子的相互作用是束流性能的一个潜在限制，特别是在未来的超低发射度光源中，束流发射度是一个非常重要的问题。传统上认为，由于束离子相互作用而引起的束流不稳定性主要由两种效应引起：离子俘获效应和快离子效应，这两种效应强调的是不同时间尺度下的束离子动力学。然而，在加速器中，束流遭受离子捕获效应和快离子效应的混合，导致更复杂的过程，并且需要自洽处理。为了研究束流特性，即束离子效应影响下束流发射度增长的特性，建立了一个基于“准强-强”模型的数值模拟程序，包括电离、束离子相互作用、同步辐射阻尼、量子激发、逐束团反馈等模块。而是更一般和一致地处理束-离子相互作用。以北京正在建设的衍射极限环高能光子源的晶格为例，说明了束离子效应。结果表明，在该低发射度环中，束-离子不稳定性在高束流操作模式下不是主要机制，但在低束流操作模式下严重。当束-离子不稳定性受到强烈驱动且同步辐射阻尼无法抑制时，采用基于有限脉冲响应滤波技术的逐束团反馈系统可以有效地抑制束-离子不稳定性。
The beam-ion interaction is a potential limitation of beam performance in electron accelerators, especially where the beam emittance is of a great concern in future ultra-low emittance light source. "Conventionally", the beam instability due to beam-ion interaction is attributed to two types of effects: ion trapping effect and fast ion effect, which emphasize the beam-ion dynamics in different time scales. Whereas, in accelerators, the beam suffers from a mixture of ion trapping effect and fast ion effect, leading to a more complicated process and requiring a self-consistent treatment. To evaluate the beam characteristics, as emittance growth under the influence from beam-ion effect, a new numerical simulation code based on the "quasi-strong-strong" model has been developed, including modules of ionization, beam-ion interaction, synchrotron radiation damping, quantum excitation, bunch-by-bunch feedback, etc. In the study, we do not regularly distinguish the ion trapping effect and the fast ion effect, but treat beam-ion interaction more generally and consistently. The lattice of High Energy Photon Source, a diffraction limit ring under construction in Beijing, is used as an example to show the beam-ion effect. It is found that in this low emittance ring, the beam-ion instability is not a dominant mechanism in operation mode with a high beam current, but seriously occurs in a lower beam current region. When the beam-ion instability were significantly driven and can not be damped by the synchrotron radiation damping, the simulations show the bunch-by-bunch feedback system based on the Finite Impulse Response filter technique can be adopted to mitigate it effectively.
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DOI：
10.1103/physrevstab.8.074402
发表时间：
2005-07
影响因子：
--
作者：
张沅;陈利民;Y. Zhang;K. Ohmi;Lm Chen
通讯作者：
张沅;陈利民;Y. Zhang;K. Ohmi;Lm Chen
DOI：
10.1103/physrevstab.14.084401
发表时间：
2011-08
影响因子：
--
作者：
L. Wang;Yunhai Cai;T. Raubenheimer;H. Fukuma
通讯作者：
L. Wang;Yunhai Cai;T. Raubenheimer;H. Fukuma
DOI：
--
发表时间：
1997-10
期刊：
--
影响因子：
--
作者：
F. Zimmermann;A. Chao;S. Heifets;M. Minty;J. Seeman;G. Stupakov;J. Byrd;J. Thomson;T. Raubenheimer-T.
通讯作者：
F. Zimmermann;A. Chao;S. Heifets;M. Minty;J. Seeman;G. Stupakov;J. Byrd;J. Thomson;T. Raubenheimer-T.
影响因子：
1.5
作者：
Eun-San Kim;K. Ohmi
通讯作者：
Eun-San Kim;K. Ohmi
影响因子：
2.5
作者：
Jiao Y;Xu G;Cui XH;Duan Z;Guo YY;He P;Ji DH;Li JY;Li XY;Meng C;Peng YM;Tian SK;Wang JQ;Wang N;Wei YY;Xu HS;Yan F;Yu CH;Zhao YL;Qin Q
通讯作者：
Qin Q