Published August 26, 2005
| Version v1
Journal article
Observation of Nonlinear Coupling between Small-Poloidal Wave-Number Potential Fluctuations and Turbulent Potential Fluctuations in Ohmically Heated Plasmas in the JFT-2M Tokamak
Creators
- 1. University of Tokyo, Tokyo 113-0033 (Japan)
- 2. Japan Atomic Energy Research Institute, Ibaraki 311-0193 (Japan)
- 3. National Institute for Fusion Science, Gifu 509-5292 (Japan)
Description
Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15 kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 95
- Journal Issue
- 9
- Journal Page Range
- p. 095002-095002.4
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 37015376
- Subject category
- S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- FLUCTUATIONS; JFT-2M TOKAMAK; KHZ RANGE 01-100; MAGNETIC FLUX; NONLINEAR PROBLEMS; PLASMA; PLASMA CONFINEMENT; PLASMA HEATING; PLASMA INSTABILITY; PLASMA WAVES; POTENTIALS
- Descriptors DEC
- CLOSED PLASMA DEVICES; CONFINEMENT; FREQUENCY RANGE; HEATING; INSTABILITY; KHZ RANGE; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; VARIATIONS
Optional Information
- Notes
- (c) 2005 The American Physical Society