influence of high energy electrons on ecrh in lhd
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ID: 209818
2012
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Abstract
The central bulk electron temperature of more than 20 keV is achieved in LHD as a result of increasing the injection power and the lowering the electron density near 2 × 1018 m−3. Such collision-less regime is important from the aspect of the neoclassical transport and also the potential structure formation. The presences of appreciable amount of high energy electrons are indicated from hard X-ray PHA, and the discrepancy between the stored energy and kinetic energy estimated from Thomson scattering. ECE spectrum are also sensitive to the presence of high energy electrons and discussed by solving the radiation transfer equation. The ECRH power absorption to the bulk and the high energy electrons are dramatically affected by the acceleration and the confinement of high energy electrons. The heating mechanisms and the acceleration process of high energy electrons are discussed by comparing the experimental results and the ray tracing calculation under assumed various density and mean energy of high energy electrons.
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| Authors | ;Ogasawara S.;Igami H.;Nishiura M.;Yoshimura Y.;Shimozuma T.;Kubo S.;Takahashi H.;Makino R. |
| Journal | utilitas mathematica |
| Year | 2012 |
| DOI |
10.1051/epjconf/20123202007
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