为最小化电击穿和累积BBU而设计的JLC/NLC的高相位超前失谐直线加速器中的偶极尾场抑制
Dipole Wakefield Suppression In High Phase Advance Detuned Linear Accelerators For The JLC/NLC Designed To Minimise Electrical Breakdown And Cumulative BBU
摘要：
最近在SLAC [1，2]和CERN [3]进行的实验显示，1.8米系列结构DDS/RDDS（阻尼失谐结构/圆形阻尼失谐结构）的单元出现了“点蚀”形式的显著变形。这种点蚀发生在加速结构的高群速度（Vg /C = 0.012）端，在结构的低群速度端几乎没有发现击穿的证据。此外，虽然初步的实验证据表明，较短和较低的群速度结构减少了击穿事件与加速场强增加。这里提出了两种设计，首先是由83个单元组成的90 cm结构，初始vg/c = 0.0506（称为H90 VG 5），其次是由55个单元组成的长度更短的60 cm结构，初始vg /c = 0.03（称为H60 VG 3）。研究了利用这些结构加速10 km以上带电束流的可行性。特别关注的问题是通过单元频率的失谐和通过局部阻尼单个单元来抑制偶极尾流场，以避免BBU（波束分裂）。结果提出的光束诱导的偶极尾场和光束动力学上遇到的跟踪进展的光束通过几千个加速结构。[1]C. Adolphsen，ROAA003，this conf. [2] R.H. Miller等人，FPAH 062，本确认[3] L. Groening等人，MPPH 039，本次会议
英文摘要：
Recent experiments at SLAC [1,2] and CERN [3] have revealed evidence of significant deformation in the form of "pitting" of the cells of the 1.8m series of structures DDS/RDDS (Damped Detuned Structure/Rounded Damped Detuned Structure). This pitting occurs in the high group velocity (vg /c = 0.012) end of the accelerating structure and little evidence of breakdown has been found in the lower group velocity end of the structure. Additional, albeit preliminary experimental evidence, suggests that shorter and lower group velocity structures have reduced breakdown events with increasing accelerating field strengths. Two designs are presented here, firstly a 90cm structure consisting of 83 cells with an initial vg/c = 0.0506 (known as H90VG5) and secondly, an even shorter structure of length 60cm consisting of 55 cells with an initial vg /c = 0.03 (known as H60VG3). The feasibility of using these structures to accelerate a charged beam over 10km is investigated. The particular issue focussed upon is suppression of the dipole wakefields via detuning of the cell frequencies and by locally damping individual cells in order to avoid BBU (Beam Break Up). Results are presented on beam-induced dipole wakefields and on the beam dynamics encountered on tracking the progress of the beam through several thousand accelerating structures. [1] C. Adolphsen, ROAA003, this conf. [2] R.H. Miller et al, FPAH062, this conf. [3] L. Groening et al, MPPH039, this conf
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