Radially localized measurements of superthermal electrons using oblique electron cyclotron emission

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871564· OSTI ID:388231

Preische, S; Efthimion, P C; Kaye, S M ^[1]

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1. Princeton University, Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)

It is shown that radial localization of optically thin electron cyclotron emission from superthermal electrons can be imposed by observation of emission upshifted from the thermal cyclotron resonance in the horizontal midplane of a tokamak. A new and unique diagnostic has been proposed and operated to make radially localized measurements of superthermal electrons during lower hybrid current drive on the Princeton Beta Experiment-Modified (PBX-M) tokamak [Bernabei, {ital et} {ital al}., Phys. Fluids B {bold 5}, 2562 (1993)]. The superthermal electron density profile as well as moments of the electron energy distribution as a function of radius are measured during lower hybrid current drive. The time evolution of these measurements after the lower hybrid power is turned off are given and the observed behavior reflects the collisional isotropization of the energy distribution and radial diffusion of the spatial profile. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Princeton Plasma Physics Laboratory
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 388231
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON CYCLOTRON-RESONANCE
ELECTRON DENSITY
LOWER HYBRID CURRENT DRIVE
PBX DEVICES
PLASMA DIAGNOSTICS
PLASMA HEATING
TOKAMAK DEVICES