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Contribution Oral

Fundamental processes and modelling

Modelling of beam transport and interactions with beamline components in the CFETR neutral beam test facility

Speakers

  • Dr. Jianglong WEI

Primary authors

Co-authors

  • Dr. Yuanlai XIE (Institute of Plasma Physics, Chinese Academy of Sciences)
  • Dr. Lizhen LIANG (Institute of Plasma Physics, Chinese Academy of Sciences)
  • Dr. Ling TAO (Institute of Plasma Physics, Chinese Academy of Sciences)
  • Dr. Yahong XIE (Institute of Plasma Physics, Chinese Academy of Sciences)
  • Prof. Chundong HU (Institute of Plasma Physics, Chinese Academy of Sciences)

Content

The neutral beam injection (NBI) will be a fundamental method for plasma heating and current drive in the China Fusion Engineering Test Reactor (CFETR). As the most critical step towards the CFETR-NBI system, a research project of the CFETR neutral beam test facility (CFETR-NBTF) has be started in China. The objectives of the first phase of CFETR-NBTF are to produce a negative hydrogen ion beam of >20A up to 200kV for 3600s and to attain a neutralization efficiency of >50%, thus a neutral beam power of >2MW is foreseen onto the calorimeter. A full-comprehensive model has been developed in the COMSOL environment to optimize the physical design of the CFETR-NBTF beamline system, in terms of the gas distribution, the beam neutralization, the beam separation, and the power deposition onto the beamline components. This model can calculate the particle motion in electromagnetic fields, including not only the primary beam, but also the co-extracted electrons and the secondary particles. The preliminary results reported here are focused on the neutralization of negative ion beam in different gas inflow and the power deposition of different particles on the residual ion dump due to electrical separation.