共查询到17条相似文献,搜索用时 125 毫秒
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设计了一种辉光放电触发赝火花开关,进行了He气介质下的放电实验研究。测得了耐受电压和气压关系,结果表明:随着气压的升高,开关耐受电压减小;开关电极孔径为3mm、电极间距为4mm时的耐受电压约是电极孔径和电极间距均为3mm时的85%。在电极孔径和电极间距均为3mm时,研究了辉光放电电流、气压、触发电压等参数对开关时延、抖动的影响。结果显示:当辉光放电电流大于0.45mA、气压为7~30Pa、触发电压达到一定值,开关就能比较稳定地触发,时延短、抖动小。在辉光放电触发下,实现了开关耐受30.5kV、时延223.2ns的输出,并实现了开关抖动小于1ns的稳定输出。 相似文献
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设计了一种辉光放电触发赝火花开关,对其时延和抖动特性进行系统研究。研究了开关时延、抖动与辉光放电电流、气压、触发电压及阳极电压的关系。当辉光放电电流小于0.30 mA时,开关无法触发导通;当电流为0.35~0.60 mA时,随辉光放电电流的增大,开关时延、抖动减小;当辉光放电电流为0.60 mA时,开关时延、抖动基本不变,出现饱和。当氦气气压低于6 Pa,开关难以触通,与理论计算值6.95 Pa吻合;当氦气气压为6~12 Pa时,开关的时延、抖动随气压的升高而减小;气压为12~30 Pa时,开关工作在比较稳定的状态。当触发电压小于3 kV,开关难以触通;随着触发电压的增大,开关时延、抖动减小;当触发电压大于5.3 kV,开关时延、抖动基本保持不变。开关在稳定工作条件下,阳极电压在8~25 kV范围内变化时;开关时延基本不变。 相似文献
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报道了4 MV激光触发多级多通道开关的结构设计和初步的实验结果及分析。该开关采用轴向聚焦触发方式,设计为匀场结构,采用场调整环与匀压环调整开关间隙电场分布,电极-绝缘子序列采用堆栈结构替代榫接结构,独立定位、紧固。实验结果表明:4 MV激光触发多级多通道开关的自击穿电压偏差小于5%,自击穿电压与工作气压呈良好的线性关系;触发延迟时间约25 ns,极差小于±2.5 ns,抖动1.5 ns;等工作电压-气压比条件下,随着气压和工作电压的上升触发延迟时间及其抖动趋向下降。 相似文献
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报道了4 MV激光触发多级多通道开关的结构设计和初步的实验结果及分析。该开关采用轴向聚焦触发方式,设计为匀场结构,采用场调整环与匀压环调整开关间隙电场分布,电极-绝缘子序列采用堆栈结构替代榫接结构,独立定位、紧固。实验结果表明:4 MV激光触发多级多通道开关的自击穿电压偏差小于5%,自击穿电压与工作气压呈良好的线性关系;触发延迟时间约25 ns,极差小于±2.5 ns,抖动1.5 ns;等工作电压-气压比条件下,随着气压和工作电压的上升触发延迟时间及其抖动趋向下降。 相似文献
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开关静态工作特性通常会随放电次数的增加而发生某些变化。针对“强光一号”加速器工作初期、工作中后期和不稳定工作期的120只气体开关,在随机抽样的基础上进行静态实验,给出了三个不同阶段直流自击穿电压与气压的关系。根据0.08 MPa下工作中、后期开关连续80次的直流自放电电压,同时利用Gauss和Weibull概率统计模型,分别计算了不同电压下单只开关和系统的自放电概率。结果均表明,对于工作中、后期的开关,当气压为0.19 MPa时,在42 kV运行电压下,加速器上120只气体开关不发生自放电的概率大于90%,与实际运行情况相符,此时开关的动态放电时延为170 ns,抖动小于20 ns。 相似文献
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采用粒子模拟和蒙特卡罗相结合的方法,应用静电求解模型,对赝火花开关初始放电过程进行了模拟。赝火花开关初始放电过程主要由汤森放电过程、等离子体形成、空心阴极效应和场致发射引发主放电组成;等离子体形成和空心阴极效应对赝火花开关的发展导通具有至关重要的作用。改变赝火花开关工作参数,如气压、电极孔径、阳极电压和阴极腔中初始粒子密度,研究其对赝火花开关电子峰值电流形成时间的影响。结果表明:随着气压、电极孔径、阳极电压和初始粒子密度的增大,赝火花开关电子峰值电流形成时间减小。 相似文献
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Larigaldie S. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1995,23(3):362-368
A transparent and compact pseudospark prototype was built to analyze the physical processes of pseudospark breakdown. It allows accurate measurements of the current and gap voltage during the collapse of the switch impedance. This led to a surprising result-the pseudospark impedance follows the same time-evolution law as the high pressure spark-gaps. However, electronic collision processes are of a different nature. A crude theoretical model based on plasma relations is proposed to solve this contradiction. This model shows how the current is controlled by the azimuthal magnetic field it induces. However, discrepancies still remain. A more sophisticated distribution of the field and current lines is assumed and investigated in a companion paper 相似文献
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Mehr T. Christiansen J. Frank K. Gortler A. Stetter M. Tkotz R. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1994,22(1):78-82
A fundamental problem of pseudospark switches is erosion in the borehole area. One way to reduce erosion is to distribute the current to several discharge channels. Essential for multichannel operation is a reliable ignition of all these channels. The aim of this work was to find out the requirements for a trigger for multichannel pseudospark switches and to develop a suitable trigger device. The investigations were made with a three channel pseudospark switch. The developed trigger is a pulsed hollow cathode discharge with a 3 mA dc-preionization. A trigger voltage of 4 kV results in a current of about 6 A in the hollow cathode of the trigger-section. This hollow cathode discharge causes a trigger current into the hollow cathodes of the pseudospark chambers. The trigger current which is necessary to ignite an equally distributed discharge has to be at least 3 mA into each main switch hollow cathode. A jitter of 2 ns was achieved for the coaxial multichannel pseudospark switch 相似文献
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Wong K.-L. Chen T.-R. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1991,19(3):525-528
The time-dependent resistive voltage and resistance of a pseudospark discharge in air are obtained by solving the equivalent circuit equation using the measured values of the discharge current and breakdown voltage. Pulsed, underdamped discharge currents ranging from about 30 to 100 A are investigated experimentally. The gas pressures range from 0.005-0.1 torr. The discharges can be characterized by three phases: initial, quasi-stationary, and relaxation. The quasi-stationary phase occurs near the time of the current maximum. The variations of the resistive pseudospark voltage are similar to those observed in a spark discharge, which can explain the sparklike behavior of a pseudospark discharge. Details of the current-voltage characteristics and resistance are presented 相似文献
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给出了赝火花开关所需辉光放电腔的具体要求,对赝火开关辉光放电腔进行了优化设计,并对优化后的放电腔进行了粒子模拟和实验研究。粒子模拟结果表明:此放电腔为辉光放电腔,辉光放电建立时间约18.5 ns;辉光放电时,此放电腔阴极位降占整个电位降的主要部分,且阴极位降区净离子密度为一常数。实验结果显示:此放电腔为辉光放电腔,其工作在Paschen曲线最低点左侧,放电电压随气压的升高而降低;当辉光放电电流为0.14~3.60 mA时,放电模式为正常辉光放电。 相似文献