Recent measurements of the electric potential profile and fluctuations in ECRH and NBI plasmas on TJ-II stellarator
Creators
- 1. NSC 'Kharkiv Institute for Physics and Technology', Kharkiv (Ukraine)
- 2. Institute of Nuclear Fusion, RRC Kurchatov Institute, Moscow (Russian Federation)
- 3. Laboratorio National de Fusion, EURATOM-CIEMAT, Madrid (Spain)
Description
Heavy Ion Beam Probe diagnostics is used in TJ-II stellarator to study directly the plasma electric potential with a good spatial (up to 1cm) and temporal (up to 2 μs ) resolution. Low density (ne = (0.3...0.5)x1019 m-3) ECRH plasma in TJ-II is characterized by positive plasma potential (φ(0) = +600...+ 400 V). At higher densities the minor area of the negative electric potential appears at the edge. This area increases with the density, finally makes potential fully negative. This tendency is affected by ECRH power and deposition area. The NBI plasmas are characterized by negative electric potential in the full plasma column from the center to the edge, (φ(0) = -300...-600 V). These results show the clear link between plasma potential, temperature, density and particle confinement
Additional details
Publishing Information
- Journal Title
- Voprosy Atomnoj Nauki i Tekhniki
- Journal Issue
- no.1/59
- Journal Page Range
- p. 31-33
- ISSN
- 1562-6016
INIS
- Country of Publication
- Ukraine
- Country of Input or Organization
- Ukraine
- INIS RN
- 40053616
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- BEAM INJECTION; BEAM INJECTION HEATING; ECR HEATING; HEAVY IONS; ION PROBES; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA POTENTIAL; TJ-II HELIAC; TURBULENCE
- Descriptors DEC
- CHARGED PARTICLES; CLOSED PLASMA DEVICES; ELECTRIC POTENTIAL; HEATING; HELIAC STELLARATORS; HIGH-FREQUENCY HEATING; IONS; PLASMA HEATING; PROBES; STELLARATORS; THERMONUCLEAR DEVICES