新的高能注量电子束二极管系统
A new diode system for high fluence electron beam
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摘要: 为“闪光二号”加速器研制了新的二极管系统, 其电子束能注量比原二极管系统大3倍多。该系统由带滑闪开关的二极管、漂移管、脉冲磁场和真空靶室等部分组成, 通过减小阴极直径、增大轴向磁场强度和磁透镜比，调节滑闪开关距离和预脉冲开关气压等技术措施, 使二极管具有高能注量电子束输出的稳定工作状态, 在Marx发生器充电电压70kV条件下，在距阴极22cm的靶上获得了总能量21.5kJ、束斑直径52mm和能注量1.01kJ/cm2的电子束输出。Abstract: For flash-II accelerator a new diode system was developed including a low impedance diode with a flash switch, drift tube, pulsed magnetic system and vacuum target chamber. Its electron beam fluence is three times more than that of the old diode system. By means of decreasing the diameter of cathode, increasing axial magnetic intensity and magnetic lens ratio, and adjusting the distance of flash switch and the pressure of pre-pulse switch a stable working regime of the diode with high fluence electron beam was achieved. While charging 70 kV into Marx generator electron beam of 21.5kJ total energy, spot diameter 52mm and energy fluence 1.01kJ/cm2 on target at a distance 22cm from cathode was acquired.
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Key words:
- flashⅡaccelerator /
- high fluence electron beam /
- pulsed electron beam diode /
- pre-pulse
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