离子对rod-pinch二极管工作特性的影响

 利用PIC粒子模拟方法，结合对同轴结构二极管工作模式的半解析描述，研究了离子存在与否对rod-pinch二极管（RPD）工作特性的影响。模拟给出了二极管的伏安特性、不同时刻电子和离子的相空间分布以及空间电流分布等。结果表明随着电流逐渐增大，其工作模式从空间电荷限制流依次向弱箍缩流和磁绝缘流转变。只有存在离子的情况下，电子才能沿着阳极杆表面运动并在其末端发生箍缩，表明RPD中离子电流的存在对于RPD工作是必需的。

Effects of ions on rod-pinch diode performance

With the aid of a semi-analytic treatment,the performance of rod-pinch diode with or without ions was characterized via particle-in-cell simulations.With the increase of diode current,the sequential transitions of the space-charge-limited flow,weakly pinched flow and magnetically insulated flow were clearly shown from electrons position and space current flow patterns.It is concluded that critical magnetically insulated current can be reached at lower voltage when ion emission is allowed,and only with ions,electrons can propagate along the anode surface and pinch can form at the tip of the rod;ions are necessary for rod pinch diode which can provide a smallarea,high-yield X-ray source for pulsed radiography.