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Author(s):
S. Murakami, M. Okamoto, N. Nakajima, M. Ohnishi, H. Okada
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Title:
Monte Carlo Simulation Study of the ICRF Minority Heating in the Large Helical Device
Date of publication:
Oct. 1993
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Key words:
Monte Carlo simulation, ICRF minority heating, the Large Helical Device, heat efficiency, finite beta effects
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Abstract:
A Monte Carlo simulation code is developed for the ICRF heating in helical systems, which takes into account finite beta effects, complicated orbits of high energetic particles, Coulomb collisions, and interactions between the particles and the applied waves. The code is used to investigate the ICRF minority heating in the Large Helical Device. The configuration of the magnetic fields changes significantly due to finite beta effects in the Large Helical Device. The resonance layer position is found to be crucial to the heating efiiciency as the plasma beta increases. When the strength of the resonance magnetic field is set to the value at the magnetic axis, the higher heat efficiency is obtained and no clear difference of the heat efficiency due to the finite beta effects is found at the high ICRF wave power region. However the radial profile of the transferred power to majority ions and electrons from minority ions changes by the deformation of the trapped particle orbits due to the finite beta effects. The heat efficiency is improved if the radial electric field, E_r, is positive (E_r is directed radially outward) and it is also improved by supplying ^3He minority ions rather than proton minority ions.
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