Generation of Intermittent Turbulent Events at the Transition from Closed to Open Field Lines in a Toroidal Plasma

Journal Article · Fri Jun 26 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.255001· OSTI ID:21346999

Happel, T ^[1]; Greiner, F ^[2]; Mahdizadeh, N ^[3]; Nold, B; Ramisch, M; Stroth, U ^[4]

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1. Laboratorio Nacional de Fusion, Asociacion EURATOM-CIEMAT, Madrid (Spain)
2. IEAP, Christian-Albrechts-Universitaet, 24098 Kiel (Germany)
3. ABB Switzerland Ltd. Corporate Research, 5405 Baden-Daettwill (Switzerland)
4. Institut fuer Plasmaforschung, Universitaet Stuttgart, 70569 Stuttgart (Germany)

Turbulent transport at the transition from closed to open field lines has been investigated in the stellarator experiment TJ-K. It is found that drift-wave turbulence in the confined region is responsible for the generation of intermittent structures (so-called blobs) in the unconfined region. There the character of turbulence changes and a decoupling of density and potential fluctuations is observed. The poloidal propagation of the intermittent events can be understood in the framework of background flows caused by gradients in the equilibrium plasma pressure and potential profiles.

• OSTI ID: 21346999
• Journal Information: Physical Review Letters, Vol. 102, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.102.255001; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DENSITY
EQUILIBRIUM PLASMA
FLUCTUATIONS
POTENTIALS
TURBULENCE
WAVE PROPAGATION
PHYSICAL PROPERTIES
PLASMA
VARIATIONS