阴阳极等离子体运动对强箍缩离子束二极管束流特性的影响

 主要研究了阴阳极等离子体运动对“闪光二号”加速器强箍缩离子束二极管束流特性的影响。给出了考虑阴阳极产生的等离子体运动对二极管间隙影响的Child-langmuir流、弱聚焦流、强聚焦流和饱和顺位流4个阶段的离子流和二极管总束流修正公式，利用这些修正公式计算的二极管总束流和离子束流强度与实测结果符合很好，在此基础上分析了提高离子束流强度和效率的方法，通过调整加速器参数，实验得到了峰值能量约500 keV，峰值电流约160 kA的高功率离子束。

Effect of cathode and anode plasma motion on current characteristics of pinch diode

The preliminary research results for the effect of cathode and anode plasma motion on current characteristics of the pinch ion diode on FLASH Ⅱ accelerator are reported.The structure and principle of pinch reflex ion beam diode are introduced.The time dependent evolution of electron and ion flow in large aspect-ratio relativistic diodes is studied by analytic models.The equation of Child-langmuir,weak focused-flow,strong focused-flow and parapotential flow are corrected to reduce the diode A-C gap caused by the motion of cathode and anode plasma.The diode current and ion current are calculated with these corrected equations,and the results are consistent with the experimental data.The methods of increasing ion current and efficiency are also presented.The high power ion beam peak current about 160 kA with a peak energy about 500 keV was produced using water-dielectric transmission-line generators with super-pinch reflex ion diodes on FLASH Ⅱ accelerator at Northwest Institute of Nuclear Technology(NINT).