Suppression of stray electrons in the negative ion accelerator of CRAFT NNBI test facility

Yang Yuwen; Wei Jianglong; Xie Junwei; Gu Yuming; Xie Yahong; Hu Chundong

doi:10.1016/j.net.2022.12.002

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자료유형: 학술저널

저자정보: Yang Yuwen (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Wei Jianglong (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Xie Junwei (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Gu Yuming (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Xie Yahong (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences) Hu Chundong (Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제3호

발행연도: 2023.3

수록면: 939 - 946 (8page)

DOI: 10.1016/j.net.2022.12.002

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Comprehensive Research Facility for Fusion Technology (CRAFT) is an integration of different demonstrating or testing facilities, which aim to develop the critical technology or composition system towards the fusion reactor. Due to the importance and challenge of the negative ion based neutral beam injection (NNBI), a NNBI test facility is included in the framework of CRAFT. The initial object of CRAFT NNBI test facility is to obtain a H0 beam power of 2 MW at the energy of 200e400 keV for the pulse duration of 100 s. Inside the negative ion accelerator of NNBI system, the interactions of the negative ions with the background gas and electrodes can generate abundant stray electrons. The stray electrons can be further accelerated and dumped on the electrodes or eject from the accelerator. The stray electrons, including the ejecting electrons, cause the unwanted particle and heat flux onto the electrodes and the inner components of beamline (especially the temperature sensitive cryopump). The suppression of the stray electrons from the CRAFT accelerator is carried out via a series of design and simulation works. The paper focuses the influence of different magnetic field configurations on the stray electrons and the character of the ejecting electrons.

#Neutral beam injection #Electrostatic accelerator #Negative ion source #CRAFT

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Yang Yuwen

소속기관 Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences