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Modelling of negative ion transport in caesium-seeded volume negative ion sources

Nuclear Fusion Volume 46 Issue 6 Page S275-S280
published_at 2006-06
2007010010.pdf
[fulltext] 506 KB
Title
Modelling of negative ion transport in caesium-seeded volume negative ion sources
Creators Fukumasa Osamu
Creators Nishida Ryo
Trajectories of H- ions are calculated numerically by solving the 3D motion equation, including effects of collisional destruction, elastic collisions and charge exchange collisions. According to these trajectories, the extraction probability of H- ions produced at any location inside the source and the energy relaxation of extracted H- ions are estimated as a function of gas pressure. Effects of production zone and field intensity of the magnetic filter on extraction probability are also discussed. The extraction probability of surface produced H- ions is much higher than that of volume produced H- ions. The kinetic energy of extracted H- ions is reduced mainly by charge exchange collisions with H in higher pressure region and by elastic collisions with H+ in lower pressure region. We also briefly discuss the pressure dependence of extracted negative ion currents combining the present numerical results and the results of the model calculation with the zero-dimensional code.
Languages eng
Resource Type journal article
Publishers International Atomic Energy Agency
Date Issued 2006-06
File Version Version of Record
Access Rights open access
Relations
[ISSN]0029-5515
[NCID]AA00759871
info:doi/10.1088/0029-5515/46/6/S07
[isVersionOf] [URI]http://www.iop.org/EJ/journal/0029-5515/1
Schools 大学院理工学研究科(工学)