Experimental characteristics of ion Bernstein wave heating on JIPP T-2U Tokamak
Abstract
The directly launched Ion Berstein Wave (IBW) heating experiments were carried out on JIPP T-IIU tokamak for two experimental conditions: the 3rd branch of the IBW between the 3rd and 4th cyclotron harmonics of the deuterium, and the 2nd branch of the IBW between the 2nd and 3rd cyclotron harmonics. In the first case, the direct hydrogen heating at omega = 1.5 OMEGA sub H was found in previous experiments. Additional data is presented to support this subharmonics heating. While, in the second case, the remarkable increase of the electron temperature was observed, especially at the central region of the plasma, and it was estimated from the global energy balance that almost all of IBW power is delivered to the electron. To investigate this difference of the heating mode, the power absorption was calculated with the ray tracing code, taking into account the effect of the plasma/antenna coupling. It is concluded from the consideration of the electron Landau damping that the transition from the ion heating mode to the electron mode would be explained by the difference of the electron temperature at the ohmic phase; i. e., T sub e (0) = 0.7 keV for the first case and T sub e (0) = 1.3 keV for the second case.
- Publication:
-
Unknown
- Pub Date:
- March 1986
- Bibcode:
- 1986ecib.rept.....O
- Keywords:
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- Bernstein Energy Principle;
- Electron Energy;
- Plasma Heating;
- Plasmas (Physics);
- Ray Tracing;
- Tokamak Devices;
- Charge Exchange;
- Energy Spectra;
- Harmonics;
- Waveguides;
- Plasma Physics