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arXiv physics/0007052physics.acc-ph
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CLIC试验装置(CTF3)驱动梁的大电流聚束系统的设计研究

Design Studies for a High Current Bunching System for CLIC Test Facility (CTF3) Drive Beam

Y. Thiery, J. Gao, J. Le Duff

摘要:

提出了一种用于CTF 3初始级的聚束系统,该系统由一个(两个)3 GHz预聚束器和一个具有可变相速度的3 GHz行波聚束器组成。电子束由140 KV直流电子枪发射。由于TW聚束器出口处的宏脉冲束流(3.5A)相当高,因此在TW聚束器内部必须考虑束流负载效应。利用PARMELA程序,数值计算表明,该聚束系统能够提供满足CTF 3设计要求的聚束。工作在2 π/3模的0.8m长TW聚束器有两个相速度,分别为0.75和1。考虑梁的加载效应,提出了两相速度区空腔的尺寸。对瞬态束流加载效应和多聚束团横向不稳定性进行了数值研究,得出在偶极模加载品质因数小于80时,应在TW聚束器中安装高阶模耦合器的结论。

英文摘要:

A bunching system is proposed for the initial stage of CTF3 which consists of one (two) 3 GHz prebunchers and one 3 GHz travelling wave (TW) buncher with variable phase velocities. The electron beam is emitted from a 140 KV DC gun. Since the macropulse beam current (3.5 A) at the exit of the TW buncher is rather high, inside the TW buncher one has to take the beam loading effect into consideration. By using PARMELA, it is shown numerically that the bunching system can provide the bunches whose properties satisfy the design requirement of CTF3. The 0.8 m long TW buncher working at 2pi/3 mode has two phase velocities, 0.75 and 1. The dimensions of the caities in the two phase velocity regions are proposed considering the beam loading effect. The transient beam loading effect and the multibunch transverse instabilities are studied numerically, and it is concluded that higher order mode couplers should be installed in the TW buncher with the loaded quality factor of the dipole mode lower than 80.

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