arXiv physics/06122382006-12-26physics.plasm-ph

强流金属等离子体毛细管放电中的瞬态空心阴极效应和Z箍缩

Transient Hollow Cathode Effects and Z pinch Formation in a High Current Capillary Discharge with a Metal Plasma

Edmund S. Wyndham, Mario Favre, Raúl Aliaga Rossel, Hernán Chuaqui, Ian Mitchell, Jorge S. Díaz, Alvaro Pernas

备注：: 3 pages, 3 figures. Presented at 15th International Conference on High-Power Particle Beams (BEAMS-2004), St. Petersburg, Russia, 18-23 Jul 2004

摘要：

本文介绍了一系列实验结果，其目的是探索在适合于X射线激光的参数下，在毛细管放电中形成纯金属等离子体的不同方案。实验中进行陶瓷壁毛细管放电电流高达120 kA，与可用的ID为3和8毫米之间，长度从60至100毫米。在毛细管中的初始等离子体条件利用瞬态空心阴极效应在预电离放电。聚焦到阴极背面的激光启动毛细管体积中的光束活动和等离子体注入。为了促进金属烧蚀进入陶瓷壁材料以外的元件的箍缩通道，已经尝试了许多分级环方案。等离子体轴向观察使用时间和能量分辨软X射线针孔图像以及从时间分辨软X射线光谱。通过改变主放电电流的上升速率和预电离条件，可以看出Z箍缩柱的直径和稳定性受到影响。从烧蚀的壁材料的等离子体形成的梯度环结构的物种的比率被发现取决于毛细管的尺寸以及其他操作条件。

英文摘要：

The results from a series of experiments are presented whose purpose is to explore different schemes which may lead to the formation of pure metal plasmas in a capillary discharge with parameters appropriate for X ray lasing. The experiments were performed in ceramic wall capillary discharges at currents of up to 120 kA, with an available ID of between 3 and 8 mm and with lengths from 60 to 100 mm. Initial plasma conditions in the capillary exploit transient hollow cathode effects in a preionizing discharge. A laser focussed onto the back surface of the cathode initiates both beam activity in the capillary volume and plasma injection. To promote metal ablation into the pinch channel of elements other than the ceramic wall material, a number of graded ring schemes have been tried. The plasma is observed axially using both time and energy resolved soft X-ray pin hole images as well as from time resolved soft X-ray spectra. By varying the rate of rise of the current of the main discharge, and the preionizing conditions the diameter and the stability of the Z-pinch column are seen to be affected. The ratio of the species from the ablated wall material to the plasma formed from the graded ring structure is found to depend both on the capillary dimensions as well as the other operating conditions.

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