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Neutral-Beam Diagnostic for Fast Confined alpha Particles in a Burning Plasma: Application on CIT (Compact Ignition Tokamak)

机译:燃烧等离子体中快速受限α粒子的中性束诊断:在CIT(紧凑型点火托卡马克)上的应用

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Diagnostic methods for fast confined alpha particles are essential for a burning-plasma experiment. We review one- and two-electron-capture methods using energetic neutral beams, and provide quantitative estimates of signal level for a two-electron-capture method applicable to CIT. The best probe is a ground-state helium-atom beam because of its relatively good penetration into a CIT plasma and the large cross section for two-electron capture; it can be produced in useful quantities from HeH sup + . We calculate a signal level of the order of 10 sup 7 counts/s for 100 mA of accelerated HeH sup + , which is sufficient to allow time-resolved measurements of the alpha-particle velocity distribution. Limited position information could be obtained for appropriate access port geometry. This diagnostic is feasible, and we recommend further research and development leading to implementation on CIT. 39 refs., 16 figs., 5 tabs. (ERA citation 13:017788)

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