Beam optics study of a negative ion source for neutral beam injection application at ASIPP
| Autor: | Gu Yuming, Caichao Jiang, M.F. Wu, Jianglong Wei, Jun Li, Yahong Xie, Jing-Yong Li, Chundong Hu, Yuqian Chen, Lizhen Liang |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Beam diameter Materials science Ion beam business.industry Mechanical Engineering Ion gun 01 natural sciences Beam parameter product 010305 fluids & plasmas Optics Ion beam deposition Nuclear Energy and Engineering Physics::Plasma Physics 0103 physical sciences Physics::Accelerator Physics General Materials Science Laser beam quality Atomic physics business Beam (structure) Civil and Structural Engineering Beam divergence |
| Zdroj: | Fusion Engineering and Design. 117:93-99 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2017.02.089 |
| Popis: | In order to study the generation and extraction of negative ions for neutral beam injection application, a negative ion source is being designed and constructed at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). Through a four electrode grids system inside the accelerator, a negative ion beam will be extracted and accelerated up to −60 kV on a reduced scale extraction area of 12 × 50 cm 2 (the area of PG apertures is 185 cm 2 ). The beam optics is a key issue for the accelerator design, and greatly determine the source experimental performance in term of beam current, heat load on the grid, beam divergence, and so on. In this paper, the trajectories of electrons and negative ions were simulated in the electrode grids of the negative ion source. The filter capability of electron deflection magnet on the co-extracted electrons is evaluated and confirmed. The negative ion beam optics was designed according to the calculated results of beam divergence and beam radius along the beamlet in different acceleration voltages. The deflection effect of the electron deflection magnet on the negative ion beam was investigated in the single beamlet case and multi-beamlets case. |
| Databáze: | OpenAIRE |
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