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Fundamental Study of Bidirectional Pulse Generator System for Linear Induction Accelerators

直线感应加速器双向脉冲发生器系统的基础研究

基本信息

批准号：
09450109
负责人：
HOTTA Eiki
金额：
$ 9.09万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450109/
关键词：
LIA Bidirectional Pulser Laser Trigger Vacuum Switch Gas Gap Switch Parallel Switch

项目摘要

The objective of this study is to get fundamental characteristics of a bidirectional pulse generator system for external pulse injection and to realize the system for linear induction accelerators. The bidirectional pulse generator system consists of a pulse generator, a cavity and a load. To realize the system, effects of each component of the pulse generator on the output waveform (accelerating voltage waveform) should be investigated. Using an equivalent circuit, the output voltage waveform was simulated. The results were compared with the experimental results obtained using a dummy load, which consists of a resistor and a diode connected in series. As a result, it was found that the inductance of output switch affected the output waveform very much and to get an ideal waveform, the inductance should be reduced. To reduce the inductance, parallel operation of switches is effective.A laser-triggered switch is known to be adequate for parallel operation, because it has low delay and low jitter. Therefore, characteristics of a laser-triggered switch filled with air, SF_6 or evacuated are experimentally investigated. A Q-switched Nd:YAG laser was used, the wavelength of which is 1064nm, the maximum output energy is 650mJ, and the pulse width is 5-7ns. The third harmonics was also used. Comparing the results obtained with focused and non-focused laser beams, it was shown that the gap separation length was not so long in our case to reveal the difference of the characteristics.Using a double cavity and an LC inversion generator, an accelerating voltage of 40kV was obtained across the dummy load. A device, which can be used for synchronous operation between the laser and the pulse generator, was made and it is planned to change the current switch and to investigate the characteristics of the bidirectional pulse generator system with a laser-triggered switch.

本研究的目的是获得用于外部脉冲注入的双向脉冲发生系统的基本特性，并实现用于直线感应加速器的系统。该双向脉冲发生器系统由脉冲发生器、腔体和负载组成。为了实现该系统，需要研究脉冲发生器的各个部件对输出波形(加速电压波形)的影响。利用等效电路，对输出电压波形进行了仿真。并与由电阻和二极管串联而成的虚拟负载的实验结果进行了比较。结果表明，输出开关的电感对输出波形的影响很大，要得到理想的输出波形，必须减小电感。为了减少电感，开关的并联运行是有效的。激光触发开关因其具有低延迟和低抖动而被认为适合于并联运行。为此，对充入空气、SF_6和真空的激光触发开关的特性进行了实验研究。采用1064 nm波长，最大输出能量为650mJ，脉宽为5-7 ns的调Q Nd：YAG激光器。三次谐波也被使用了。通过对聚焦和非聚焦两种情况下的实验结果进行比较，发现在我们的情况下，间隙间隔长度并不是很长，以揭示两者特性的差异。利用双腔和LC反转发生器，在虚拟负载上获得了40kV的加速电压。研制了一种可用于激光器和脉冲发生器同步工作的装置，并计划改变电流开关，研究具有激光触发开关的双向脉冲发生器系统的特性。