Numerical and Experimental Study of Atomic Transport and Balmer Line Intensity in Linac4 Negative Ion Source

被引：8
|
作者：
Shibata, T. [1 ]
Mattei, S. [2 ]
Nishida, K. [1 ]
Lettry, J. [2 ]
Hatayama, A. [1 ]
机构：
[1] Keio Univ, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
[2] CERN, CH-1211 Geneva 23, Switzerland
来源：
FOURTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2014) | 2015年 / 1655卷
关键词：
negative hydrogen in source; RF-driven; Balmer line; numerical analysis; HYDROGEN; PLASMA;
D O I：
10.1063/1.4916417
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Time structure of Balmer H-alpha line intensity in Linac4 RF plasma has been analyzed by the combined simulation model of atomic transport and Collisional-Radiative models. As a preliminary result, time variation of the line intensity in the ignition phase of RF plasma is calculated and compared with the experimental results by photometry. For the comparison, spatial distribution of the local H-alpha photon emission rate at each time is calculated from the numerical model. The contribution of the local photon emission rates to the observed line intensity via optical viewing port is also investigated by application of the mock-up of the optical viewing port and the known light source. It has been clarified from the analyses that the higher and the lower peaks of the H-alpha line intensity observed during I RF cycle is mainly due to the different spatial distributions in the electron energy distribution function and the resultant local photon emission rate. These results support previous suggestion that the existence of the capacitive electric field in axial direction leads to the higher/lower peaks of the line intensity.
引用
收藏
页数：8
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