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Extension of the operational regime of the LHD towards a deuterium experiment
- Source :
- Y. Takeiri et al 2017 Nucl. Fusion 57 102023, Nuclear Fusion
- Publication Year :
- 2017
- Publisher :
- IOP Publishing, 2017.
-
Abstract
- As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, Ti and Te, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value $\left\langle \beta \right\rangle $ . The high $\left\langle \beta \right\rangle $ regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.
- Subjects :
- Nuclear and High Energy Physics
Materials science
stellarator/heliotron
Extension (predicate logic)
Condensed Matter Physics
01 natural sciences
010305 fluids & plasmas
Large Helical Device
impurity transport
Deuterium
Physics::Plasma Physics
0103 physical sciences
internal transport barrier
Atomic physics
010306 general physics
Spectroscopy
high beta plasma
Subjects
Details
- Language :
- English
- ISSN :
- 00295515
- Volume :
- 57
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion
- Accession number :
- edsair.doi.dedup.....06b1c2bee57ac76c5a82bc3824a66d12