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RESEARCH ON EXCITATION DISCHARGES FOR SHORT WAVE LENGTH LASER BY LONGITUDINAL ELECTRIC FIELD

短波激光纵向电场激发放电研究

基本信息

批准号：
03452287
负责人：
MIYAMOTO Tetsu
金额：
$ 3.65万
依托单位：
COLLEGE OF SCIENCE AND TECHNOLOGY,NIHON UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452287/
关键词：
Gas laser N_2 laser ASE laser Gas-puff Z pinch Z pinch Surface flashover switch 縦電場励起窒素レ-ザ-ガスレ-ザ-縦電場放電励起

项目摘要

The purpose of this research is to investigate the possibility of lasing discharge by means of a longitudinal electric field(LE mode)in place of the transverse electric field(TE mode). The investigation was carried out for two subjects -to prove the ASE (amplified spontaneous emission)laser by the divided electrode longitudinal discharge and to study gas-puff Z pinches for producing a high temperature, uniform plasma needed for the soft X ray laser.It was proved that the N_2 laser was emitted by the longitudinal discharge using the divided electrodes. The discharges were unstable, however, and the reproducibility was poor. These difficulties were partly improved by modifying the electrode structure, increasing the applied voltage and applying the pre-ionizing discharge. It was not possible to attain so reliable and high power laser as expected. The reason resulted from having not been able to control each discharge between adjacent electrodes. A powerful pre-ionization and finding a structure to make it possible will be necessary. They are the problems to be solved hereafter. As a by-product the improved surface flashover switches that were triggered by the corona discharge and field distortion were developed. The resistivity was lower in this switch than in the previous ones, and the damage was less. It was more reliable furthermore.On the other hand the hot plasma with the electron temeperature of more than 10^7 K was produced by the gas -puff Z pinch. The inhomogeneities resulted from external conditions were substantially decreased by improving the electrode structure and controlling the injection angle of gas. The hot spots resulted from the MHD instabilities were still observed. The number of them, however, increased by the appropriate gas injection, and they were produced along the axis.

本研究的目的是探讨以纵向电场（LE模式）取代横向电场（TE模式）来产生雷射放电的可能性。本文从两个方面进行了研究，一是用分割电极纵向放电产生ASE（放大自发辐射）激光，二是用喷气式Z箍缩产生高温均匀等离子体以满足软X射线激光的需要，证明了N_2激光是用分割电极纵向放电产生的。然而，放电是不稳定的，并且再现性差。通过改变电极结构、提高外加电压和采用预电离放电等措施，这些困难得到了部分改善。不可能获得预期的如此可靠和高功率的激光器。其原因是不能控制相邻电极之间的每次放电。一个强大的预电离和找到一个结构，使之成为可能将是必要的。这些都是今后要解决的问题。作为副产品，改进的表面闪络开关，由电晕放电和磁场畸变触发的发展。这种开关的电阻率比以前的开关低，损伤小，工作可靠性高，另一方面通过喷气Z箍缩产生了电子温度超过10^7K的高温等离子体。通过改进电极结构和控制气体注入角度，可以有效地减小外界条件引起的不均匀性。由MHD不稳定性引起的热点仍然存在。然而，通过适当的气体注入，它们的数量增加了，并且它们沿着轴线产生。