Ion optics for multiple charge exchange collisions determined by mean of Monte Carlo simulation

T. Takeuchi; T. Yamagata; K. Yonehara

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Ion optics for multiple charge exchange collisions determined by mean of Monte Carlo simulation

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A novel type of polarized ↑(3)He ion source based on “electron pumping” was recently proposed. This ion source requires multiple electron capture and stripping collisions of 3He↑(+) ions with polarized alkali atoms under a strong magnetic field (2-3 T). Since these processes may induce a serious increase in the emittance and reduction of polarized beam intensity, we investigated them in detail by using the Monte Carlo simulation. It was found that there is (1) increase in the emittance results not from angular broadening but from a beam size enlargement, (2) the phenomena under magnetic field B are simplified by a collisionless phenomenon under a weaker magnetic field (effective magnetic field) B ↓(eff) defined by B ↓(eff)# ( λ ↓(+ 0)/(λ ↓(+ 0)+λ(0 +) ）) B, where λ( + 0) and λ( 0 +) are mean free paths for ↑(3)He↑(+) ions and ↑(3)He↑(0) atoms traveling in the alkali vapor. # 1998 American Institute of Physics. S0034-6748(98)02602-1

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《Review of Scientific Instruments》 |1998年第2期|412-417|共6页
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T. Takeuchi; T. Yamagata; K. Yonehara;
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Department of Physics, Konan University, /Higashinada, Kobe 658, Japan;

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Ion optics for multiple charge exchange collisions determined by mean of Monte Carlo simulation

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