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Core plasma confinement during detachment transition with RMP application in LHD
- Source :
- Nuclear Materials and Energy, Vol 17, Iss, Pp 137-141 (2018)
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The core plasma confinement during detachment phase is investigated in the discharges with application of resonant magnetic perturbation (RMP) field in LHD. The RMP application creates a remnant magnetic island in the edge stochastic layer, which largely changes the plasma parameter profiles including impurity radiation. The electron temperature and pressure profiles are flattened at the island, while the electron density is slightly peaked at the edge of the island. The estimated impurity radiation profile is enhanced and fixed around the magnetic island during the detached phase, where the discharge is stably sustained with controlled level of radiation. Without RMP, the radiation penetrates the confinement region, leading to radiation collapse. It is found that in the case of the RMP application the plasma stored energy increases discontinuously at the detachment transition. In spite of the reduced effective plasma volume caused by the edge magnetic island and by the enhanced radiation there, the central plasma pressure finally exceeds the case without RMP. This is caused by the pressure profile peaking at the central region in the case with RMP. These results indicate clear change of core plasma confinement during the detached phase with RMP.
- Subjects :
- Nuclear and High Energy Physics
Electron density
Materials science
Materials Science (miscellaneous)
Atmospheric-pressure plasma
Plasma
Radiation
lcsh:TK9001-9401
01 natural sciences
010305 fluids & plasmas
Core (optical fiber)
Nuclear Energy and Engineering
Physics::Plasma Physics
Phase (matter)
0103 physical sciences
Plasma parameter
lcsh:Nuclear engineering. Atomic power
Electron temperature
Atomic physics
010306 general physics
Subjects
Details
- ISSN :
- 23521791
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Nuclear Materials and Energy
- Accession number :
- edsair.doi.dedup.....5874096cfa89bfdc1abb2cf88a58c9e6