Production of polarized 3He2+ ion by ECR ionizer
Production of polarized 3He2+ ion by ECR ionizer
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DOI：
10.1016/j.nima.2004.01.063
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发表时间：
2004-05
影响因子：
1.4
通讯作者：
Momoko Tanaka;N. Shimakura;Y. Plis
中科院分区：
文献类型：
--
作者：
Momoko Tanaka;N. Shimakura;Y. Plis
用Monte Carlo模拟方法研究了极化~ 3 He气体的电子回旋共振（ECR）电离器作为小型极化~ 3 He离子源的可能性。在计算中，我们假设去极化机制是由ECR等离子体中3 He原子和离子在外加磁场和微波作用下的多次电离、非弹性散射和去电离过程引起的。为了验证蒙特卡罗模拟的有效性，我们计算了极化氢气在ECR电离器中电离后的质子极化，发现计算结果与实验结果一致。在现有的3 He气体极化度的典型值（P气体的极化度为0.5）下，基于ECR电离器的极化3 He离子源可望产生最大极化度小于0.2的极化3 He 2+离子束。
The possibility of using an Electron Cyclotron Resonance (ECR) ionizer for polarized 3 He gas as a compact polarized 3 He ion source is investigated by the Monte Carlo simulation over an ECR frequency range from 2 to 16 GHz. In this calculation, we assume that the depolarization mechanism is caused by multiple ionization, inelastic scattering, and de-ionization processes of the 3 He atoms and ions confined in the ECR plasma under the presence of the external magnetic field and the microwave for ECR. To check the validity of the present Monte Carlo simulation, we calculate the proton polarization following the ionization of polarized hydrogen gas by the ECR ionizer and find consistency between the calculated results and experimental ones. With a typical value of the 3 He gas polarization currently available, ie P gas∼ 0.5, a polarized 3 He 2+ beam with the maximum polarization less than 0.2 can be expected from the polarized 3 He ion source based on the ECR ionizer.