Published November 25, 2002 | Version v1
Journal article Metadata-only

Experimental and theoretical study of quasicoherent fluctuations in enhanced Dα plasmas in the Alcator C-Mod tokamak

Creators

  • 1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  • 2. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

Description

A comparison of experimental measurements and theoretical studies of the quasicoherent (QC) mode, observed at high densities during enhanced Dα (EDA) H mode in the Alcator C-Mod tokamak, are reported. The QC mode is a high frequency (∼100 kHz) nearly sinusoidal fluctuation in density and magnetic field, localized in the steep density gradient ('pedestal') at the plasma edge, with typical wave numbers kR≅3-6 cm-1, kθ≅1.3 cm-1 (midplane). It is proposed here that the QC mode is a form of resistive ballooning mode known as the resistive X-point mode, in reasonable agreement with predictions by the BOUT (boundary-plasma turbulence) code

Additional details

Identifiers

DOI
10.1103/PhysRevLett.89.225004;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
89
Journal Issue
22
Journal Page Range
p. 225004-225004.4
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
35030283
Subject category
S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
Descriptors DEI
ALCATOR DEVICE; BALLOONING INSTABILITY; FLUCTUATIONS; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA FLUID EQUATIONS; TURBULENCE
Descriptors DEC
BOLTZMANN-VLASOV EQUATION; CLOSED PLASMA DEVICES; CONFINEMENT; DIFFERENTIAL EQUATIONS; EQUATIONS; INSTABILITY; PARTIAL DIFFERENTIAL EQUATIONS; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; VARIATIONS

Optional Information

Notes
(c) 2002 The American Physical Society