Particle source and edge confinement study based on spectroscopic diagnosis in the LHD

作者：Goto M^*; Sawada K; Oishi T; Morita S

来源：Plasma Physics and Controlled Fusion, 2016, 58(8): 084001.

DOI：10.1088/0741-3335/58/8/084001

• plasma spectroscopy
• hydrogen
• particle confinement time

The particle source rate profile from edge to core region of the LHD (Large Helical Device) plasma is derived by a detailed analysis of the Balmer-alpha line of neutral hydrogen. The results are used for evaluating the particle confinement time for a plasma volume within a given magnetic flux surface, tau(p)(r(eff)), where r(eff) is the averaged minor radius of the flux surface. Characteristics of the particle confinement are evaluated in terms of tau(p)(r(eff)) for different conditions of the plasma. A discharge with B-ax = 0.41 T, where B-ax is the magnetic field strength at the magnetic axis, gives tau(p)(r(eff)) similar to 0.01 s at the edge region, which is approximately one order of magnitude smaller than that of a discharge with B-ax = 2.75 T, while the both discharges give similar tau(p)(r(eff)) in the core region. This result confirms that the high confinement performance in the strong magnetic field discharges can be ascribed, at least in part, to a high particle confinement characteristics in the plasma edge region.

• 出版日期2016-8