Investigation into light emission from droplet spots produced by low-current vacuum are discharge

XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV. Pub Date : 2004-09-27 DOI:10.1109/DEIV.2004.1418640

A. Batrakov, B. Juettner, E. Pryadko

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Abstract

Some of droplets emitted by vacuum arc cathode spot and surrounded by dense plasma were suggested recently to be referred to as droplet spots. Droplet spot plasma temperature and concentration are close to those of the cathode spot plasma. The goal of this work is study of spectral characteristics of droplet spot light emission. High-speed imaging based on an IMACON 468 camera in combination with narrow-banded interference filter was used for getting spectrum. Droplet spot spectrum was compared with cathode spot one taken in the same experiments. Comparison revealed resemblance in the spectrums. Second part of the work describes light emission dynamics of droplet spots after arc discharge extinction. It has been found that brightness in visible an IR light of some droplets grows in time during tens to hundreds microseconds after discharge extinction, then it decreases gradually. The most intriguing fact is that a cycle of growing brightness is followed sometimes by a repeated cycle (and even a few cycles).

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小电流真空放电产生的液滴点发光特性的研究

近年来，人们提出将真空弧阴极点发射出来的被致密等离子体包围的液滴称为液滴点。液滴斑点等离子体的温度和浓度与阴极斑点等离子体的温度和浓度接近。本文的目的是研究液滴聚光发射的光谱特性。采用IMACON 468相机高速成像，结合窄带干涉滤光片进行频谱提取。将液滴光斑光谱与阴极光斑光谱进行了比较。比较显示出光谱的相似之处。第二部分描述了电弧放电消光后液滴光斑的发光动力学。研究发现，某些液滴的可见光和红外光亮度在放电消光后的几十~几百微秒内随时间的推移而增大，然后逐渐减小。最有趣的事实是，亮度增加的周期之后有时会有一个重复的周期(甚至几个周期)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.

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