Injector and Waveguide Design Parameters for a High Energy Electron-Positron Linear Accelerator
Injector and Waveguide Design Parameters for a High Energy Electron-Positron Linear Accelerator
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DOI：
10.1109/tns.1965.4323683
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发表时间：
1965-06
影响因子：
1.8
通讯作者：
J. Haimson
中科院分区：
文献类型：
--
作者：
J. Haimson
本文讨论了一台用于储存环注入器的六速调管、十二段、450 MeV电子-350 MeV正电子直线加速器的电子束光学设计。束中心线包括三个区域，即注入系统、高电流波导部分和高能量增益部分。注入系统被布置成使得来自脉冲二极管源的束在2856 Mc处被斩波和预聚束，以提供用于注入到第一加速器部分中的良好限定的紧密聚焦的短电子聚束。位于斩波器和预聚束器腔之间的纳秒偏转系统提供可变短脉冲能力以及9.5兆赫兹的光束调制，以在每个枪脉冲期间产生一系列短脉冲。前四个波导部分被设计用于107.5 Mev的未加载射束能量和在60 Mev下的500 mA峰值电流，在每个输入耦合器处具有10 MW峰值r-f功率。正电子转换器位于这些部分的端部，并且紧接在机器的高能量增益部分之前，该机器包括八个波导，每个波导的长度为504 cm，并且被设计用于具有10 MW峰值r-f输入功率的45.4 Mev的无载束能量。详细的微波设计参数和一些电子束特性的实际束性能的初步测量一起提出。
This paper discusses the electron beam optics design of a six klystron, twelve section, 450 Mev electron 350 Mev positron linear accelerator which has been designed as an injector for a storage ring. The beam centerline comprises three zones; namely, the injection system, the high current waveguide sections and the high energy gain sections. The injection system is arranged such that the beam from a pulsed diode source is chopped and prebunched at 2856 Mc to provide well defined tightly focussed short bunches of electrons for injection into the first accelerator section. A nanosecond inflection system, located between the chopper and prebuncher cavities, provides variable short pulse capability as well as 9.5 Mc modulation of the beam to produce a train of short pulses during each gun pulse. The first four waveguide sections are designed for an unloaded beam energy of 107.5 Mev, and 500 ma peak current at 60 Mev with 10 MW peak r-f power at each input coupler. A positron converter is located at the end of these sections and immediately prior to the high energy gain portion of the machine which comprises eight waveguides each of which is 504 cm in length and designed for an unloaded beam energy of 45.4 Mev with 10 MW peak r-f input power. Details of the microwave design parameters and some electron beam characteristics are presented together with preliminary measurements of actual beam performance.