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Dense Plasma Formation by Carbon Thin Film Liner Compression

通过碳薄膜内衬压缩形成致密等离子体

基本信息

批准号：
62580002
负责人：
ISHII Shozo
金额：
$ 1.34万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62580002/
关键词：
Dense Plasma Z-Pinch Carbon Thin Film Liner Compression 軟X線

项目摘要

We proposed carbon thin film liner compression scheme in Z-pinches which is effective for the application of high intensity pulsed X-ray sources and X-ray lasers. The experiments proved the principle to be valid. The method of using a conductive thin film deposited on the surface of discharge tube wall as a compression liner can overcome the technical difficulties in handling mechanically weak oylindrical metal liners. If the process of making the thin film is properly chosen, a series of experiments can be done in the discharge vessel which is continuously pumped. Since the liner is made from anything which becomes thin film, a great variety of radiation spectra can be obtained in the wavelength range of soft X-ray. A numerical simulation on pinch dynamics shows that conventional capacitor banks can easily drives the carbon thin film liner. The optimum way of producing the thin film was examined by applying several methods, namely, RF, AC or DC glow, and pulsed discharge, arc plasma, and vacuum vapor deposition. Uniform and conductive thin films were produced by vacuum vapor deposition. However; the film deposition time was so long that the carbon film liner compression was unsuccessful. We changed carbon to aluminum as the liner material. Aluminum thin film liner is formed on the tube wall of a 7cm diameter discharge tube by vacuum vapor deposition. A capacitor (20kV,900J) discharge drives the liner compression. The liner is compressed to the axis when the current reaches its maximum of 70kA and the soft X-ray emission is observed.

提出了Z箍缩中碳薄膜衬垫压缩方案，该方案对高强度脉冲X射线源和X射线激光器的应用是有效的。实验证明了该原理的有效性。用沉积在放电管壁表面的导电薄膜作为压缩衬垫的方法，可以克服机械强度较弱的压缩金属衬垫的处理技术难题。如果薄膜的制备工艺选择得当，可以在连续抽气的放电管中进行一系列的实验。由于衬层是由任何可以变成薄膜的材料制成的，因此可以在软X射线的波长范围内获得各种各样的辐射光谱。对箍缩动力学的数值模拟表明，传统的电容器组可以很容易地驱动碳薄膜衬垫。通过应用几种方法，即RF，AC或DC辉光，和脉冲放电，电弧等离子体，和真空气相沉积，检查生产薄膜的最佳方式。采用真空气相沉积法制备了均匀的导电薄膜。然而，膜沉积时间太长，以至于碳膜衬垫压缩不成功。我们将碳改为铝作为内衬材料。采用真空气相沉积法在直径为7cm的放电管管壁上沉积了铝薄膜内衬。电容器（20 kV，900 J）放电驱动衬垫压缩。当电流达到最大值70kA时，衬层被压缩到轴向，并观察到软X射线发射。