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首页> 外文期刊>Proceedings of the IEEE >Production and investigation of TW proton beams from an annular diode using strong radial magnetic insulation fields and a preformed anode plasma source
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Production and investigation of TW proton beams from an annular diode using strong radial magnetic insulation fields and a preformed anode plasma source

机译：使用强径向磁绝缘场和预制阳极等离子体源，从环形二极管产生和研究TW质子束

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A magnetically insulated proton diode in extraction geometry which has achieved an ion beam power of 0.8 TW and an ion production efficiency of greater than 90% is described. Using a Pd-Ti metal hydride film on the anode surface and diverting part of the generator current through it with the help of plasma opening switches, a proton-rich plasma is preformed on the anode before any voltage occurs across the diode gap. Thus it is possible to apply very strong magnetic insulation, V/sub c//V/sub op/<3. Ion current and diode voltage simultaneously reach a plateau for 40 ns, resulting in a nearly constant diode impedance for 60 ns. Thus, chromatic aberrations of the diode focusing system are minimized. The microscopic divergence of proton beamlets due to diode effects is determined to be 0.7 degrees . Geometric aberrations of spherical and aspherical anode shape have been determined. The experimental results are compared to simulations with a 2.5 dimensional stationary PIC (particle-incell) code.
机译：描述了具有提取几何形状的磁绝缘质子二极管，其实现了0.8 TW的离子束功率和大于90％的离子产生效率。在阳极表面上使用Pd-Ti金属氢化物膜，并借助等离子打开开关转移一部分发生器电流，从而在阳极间隙上产生任何电压之前，会在阳极上形成富含质子的等离子体。因此可以施加非常强的磁绝缘，V / sub c // V / sub op / <3。离子电流和二极管电压同时达到平稳状态40 ns，从而使二极管阻抗保持60 ns几乎恒定。因此，二极管聚焦系统的色差被最小化。由二极管效应引起的质子子束的微观发散确定为0.7度。已经确定了球形和非球形阳极形状的几何像差。将实验结果与使用2.5维固定PIC（粒子单元）代码的仿真进行比较。

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