Validation of the distribution of stripping loss neutrals in the accelerator of the negative ion source

K. Ikeda, M. Kisaki, H. Nakano, K. Tsumori, K. Nagaoka, Y. Fujiwara, S. Masaki, E. Rattanawongnara, M. Osakabe
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Abstract

The difference of the stripping loss between hydrogen and deuterium is examined using two approaches. The first is the measurement of the optical beam emission. The wavelength of beam emission spectrum reflects the energy distribution of beam particles by the Doppler effect. The low-energy stripping peak is observed in the energy band corresponding to the extraction voltage, and also a moderate shoulder is distributed in the lower energy region. Secondly, the spatial and the energy distribution in the accelerator is estimated by the attenuation calculation using the vacuum pressure distribution in the accelerator. Stripping neutrals are concentrated in the low energy region, and a peak is formed at 9 keV in the energy distribution due to stripping neutrals inside the extraction grid aperture. The total stripping loss inside the accelerator is 16% for hydrogen and 24% for deuterium. The calculated Doppler-shifted spectra for hydrogen and deuterium clearly show the peak with the moderate shoulder on the redshift side, which is consistent with the measured results.
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负离子源加速器中剥离损失中性分布的验证
用两种方法研究了氢和氘汽提损失的差异。首先是光束发射量的测量。光束发射光谱的波长通过多普勒效应反映了光束粒子的能量分布。在提取电压对应的能量带中观察到低能剥离峰,在较低的能量区也分布着一个适中的肩带。其次,利用加速器内的真空压力分布进行衰减计算,估计出加速器内的空间和能量分布;剥离中性粒子集中在低能区,在9 keV处形成能量分布峰。加速器内氢气和氘的总汽提损失分别为16%和24%。计算得到的氢和氘的多普勒移谱清晰地显示出在红移侧有中等肩的峰,与实测结果一致。
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