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It is significant to study negative hydrogen ion source for the construction of Chinese national spallation neutron source (CSNS) and the implementation of the international thermonuclear experimental reactor (ITER) project. Numerical simulation is an indispensable research measure due to the physical characteristics of ion source. In view of the facts above, in this paper we first elaborate the self-developed three-dimensional particle-in-cell/Monte Carlo collisions (PIC/MCC) algorithm and then describe the mechanism of negative hydrogen ion (H-) volume production. Based on these, the multi-cusp proton source of the Chinese atomic energy research center is systematically simulated. In the cases of the same polarities and the opposite polarities of extraction magnetic fields, multi-cusp proton source discharge characteristics are discussed and analyzed respectively. The result shows that in the case of the opposite polarities of the two extraction magnets, magnetic drift directions near the two extraction magnets are the same and have great values, namely intense magnetic drift, which causes the total number of electrons to be big, and induces the high-energy electrons to become active in a specific area. And so, the volume production rate of H- ions is higher, that is to say, H- ions present Y drift. On the contrary, in the case of the same polarities of the two extraction magnets, the binding effect of electron is worse and the volume production rate of H- ions is lower, but spatial distribution of volume production H- is uniform.
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Keywords:
- multi-cusp source /
- magnetic drifting /
- volume production
[1] Jia X L, Zhang T J, L Y L, Ai C J, Chu C J, Guan F P, Xing J S 2007 High Energy Phys. Nucl. Phys. 31 292 (in Chinese) [贾先禄, 张天爵, 吕银龙, 艾长军, 储诚节, 管锋平, 邢建升 2007 高能物理与核物理 31 292]
[2] Wu X B, Huang T, Ouyang H F 2010 Chin. Phys. C 34 1900
[3] Yang C 2012 Ph. D. Dissertation (Chengdu: University of Electronic Science and Technology of China) (in Chinese) [杨超 2012 博士学位论文 (成都: 电子科技大学)]
[4] Terasaki R, Fujino I, Hatayama A 2010 Rev. Sci. Instrum. 81 02A703
[5] Shibata T, Terasaki R, Kashiwagi M, Inoue T, Dairaku M, Taniguchi M, Tobari H, Watanabe K, Sakamoto K, Hatayama A 2013 Third International Symposium on Negative Ions, Beams and Sources (Finland: Jyväskylä) p177
[6] Wang T, Yang Z, Dong P, Long J D, He X Z, Wang X, Zhang K Z, Zhang L W 2012 Rev. Sci. Instrum. 83 063302
[7] Yang C, Liu D G, Wang X M, Liu L Q, Wang X Q, Liu S G 2012 Acta Phys. Sin. 61 045204 (in Chinese) [杨超, 刘大刚, 王小敏, 刘腊群, 王学琼, 刘盛纲 2012 61 045204]
[8] Yang C, Liu D G, Chen Y, Xia M Z, Wang X Q, Wang X M 2012 Acta Phys. Sin. 61 135203 (in Chinese) [杨超, 刘大刚, 陈颖, 夏蒙重, 王学琼, 王小敏 2012 61 135203]
[9] Yang C, Yin M W, Shang L P, Wei A Y 2014 Chin. Phys. B 23 095201
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[1] Jia X L, Zhang T J, L Y L, Ai C J, Chu C J, Guan F P, Xing J S 2007 High Energy Phys. Nucl. Phys. 31 292 (in Chinese) [贾先禄, 张天爵, 吕银龙, 艾长军, 储诚节, 管锋平, 邢建升 2007 高能物理与核物理 31 292]
[2] Wu X B, Huang T, Ouyang H F 2010 Chin. Phys. C 34 1900
[3] Yang C 2012 Ph. D. Dissertation (Chengdu: University of Electronic Science and Technology of China) (in Chinese) [杨超 2012 博士学位论文 (成都: 电子科技大学)]
[4] Terasaki R, Fujino I, Hatayama A 2010 Rev. Sci. Instrum. 81 02A703
[5] Shibata T, Terasaki R, Kashiwagi M, Inoue T, Dairaku M, Taniguchi M, Tobari H, Watanabe K, Sakamoto K, Hatayama A 2013 Third International Symposium on Negative Ions, Beams and Sources (Finland: Jyväskylä) p177
[6] Wang T, Yang Z, Dong P, Long J D, He X Z, Wang X, Zhang K Z, Zhang L W 2012 Rev. Sci. Instrum. 83 063302
[7] Yang C, Liu D G, Wang X M, Liu L Q, Wang X Q, Liu S G 2012 Acta Phys. Sin. 61 045204 (in Chinese) [杨超, 刘大刚, 王小敏, 刘腊群, 王学琼, 刘盛纲 2012 61 045204]
[8] Yang C, Liu D G, Chen Y, Xia M Z, Wang X Q, Wang X M 2012 Acta Phys. Sin. 61 135203 (in Chinese) [杨超, 刘大刚, 陈颖, 夏蒙重, 王学琼, 王小敏 2012 61 135203]
[9] Yang C, Yin M W, Shang L P, Wei A Y 2014 Chin. Phys. B 23 095201
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