ECRIS中电荷增殖过程的模拟
Simulations of charge-breeding processes in ECRIS
摘要:
利用NAM-ECRIS程序获得的靶氦等离子体参数,对电子回旋共振离子源中的电荷增殖过程进行了数值模拟。对于某些碱金属离子束,获得了增殖效率随1+离子注入能量的变化关系。提取的离子的时间依赖性进行计算;电流达到饱和的典型时间在几十毫秒的范围内。电荷交换过程中的离子繁殖的作用进行了讨论。源壁上的离子的再循环被证明是重要的。
英文摘要:
Charge-breeding processes in Electron Cyclotron Resonance Ion Sources are numerically simulated by using the target helium plasma parameters obtained with NAM-ECRIS code. Breeding efficiency is obtained as a function of 1+ ion injection energy for some alkali ion beams. Time dependencies of extracted ions are calculated; typical times for reaching saturation in currents are in the range of few tens of milliseconds. Role of charge-exchange processes in breeding of ions is discussed. Recycling of ions on the source walls is shown to be important.
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