Observation of confinement degradation of energetic ion due to Alfven eigenmodes in weak shear plasmas on JT-60U
- 1. Japan Atomic Eneryg Agency, Fusion Research and Development Directorate, Naka, Ibaraki (Japan)
Description
Confinement degradation due to Alfven Eigenmodes has been investigated with negative ion based injection at ∼ 370 keV into weak shear plasmas on JT-60U. The AEs with a rapid frequency sweeping and then saturation as the minimum value of safety factor (qmin) decrease have been observed. These frequency behavior can be explained by reversed-shear induced AE (RSAE) and the transition from RSAE to TAE. Reduction rate of total neutron emission rate in the presence of AEs is evaluated by calculation with Orbit Following Monte-Carlo code taking into account changing in bulk plasmas. The changes in total neutron emission rate and CX-NP flux suggested energetic ion transport due to these AEs. The evolution indicates confinement of energetic ions is degraded due to AEs. In particular, it is found confinement degradation is maximum during transition from RSAE to TAE and the maximum reduction rate (ΔSn/Sn)MAX is estimated ∼45%. (author)
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Additional details
Publishing Information
- Imprint Title
- Proceedings of the 9th IAEA technical meeting on 'energetic particles in magnetic confinement systems'
- Imprint Pagination
- 217 p.
- Journal Page Range
- p. 5-11
- Report number
- NIFS-PROC--63
Conference
- Title
- 9. IAEA technical meeting on 'energetic particles in magnetic confinement systems'
- Dates
- 9-11 Nov 2005
- Place
- Takayama, Gifu (Japan)
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 38115724
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ALFVEN WAVES; ANIONS; CHARGED-PARTICLE TRANSPORT; ELECTRON DENSITY; ELECTRON TEMPERATURE; ENERGY LOSSES; ION TEMPERATURE; JT-60U TOKAMAK; MONTE CARLO METHOD; NEUTRAL ATOM BEAM INJECTION; NEUTRON EMISSION; O CODES; PLASMA CONFINEMENT; PLASMA MACROINSTABILITIES; PLASMA RADIAL PROFILES; PLASMA SIMULATION; PRESSURE GRADIENTS; SHEAR
- Descriptors DEC
- BEAM INJECTION; CALCULATION METHODS; CHARGED PARTICLES; CLOSED PLASMA DEVICES; COMPUTER CODES; CONFINEMENT; EMISSION; HYDROMAGNETIC WAVES; INSTABILITY; IONS; LOSSES; PLASMA INSTABILITY; RADIATION TRANSPORT; SIMULATION; THERMONUCLEAR DEVICES; TOKAMAK DEVICES
Optional Information
- Notes
- 21 refs., 8 figs.