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Title: Absorption of rf power by a plasma in a magnetic field

Abstract

The absorption of rf power by a plasma in an alternating electric field and a constant magnetic field at right angles to one another has been studied experimentally. The plasma is produced between two coaxial cylinders (800 mm long and 12 and 70 mm in diameter, respectively), between which an rf voltage of frequency f = 7.4 MHz and of amplitude V up to 200 V is applied. The magnetic field H is varied over the range 0--1100 Oe. The discharge occurs in helium at a pressure in the range p = 10/sup -1/-10/sup -2/ torr. The plasma density n and the electron temperature T/sub e/ are (1--10) x 10/sup 10/ cm/sup -3/ and 4--10 eV, respectively. The rf power p absorbed by the plasma and the alternating electric field in the plasma, E, are measured for various values of H, V, and p. It is shown that at small values of p the power p is much higher than the calculated values at large values of H(>400--500 Oe) and V(>60--80 V). The effective electron collision frequency ..nu../sub eff/ found through by comparing the experimental and calculated values of P and independently from measurements of E are roughly an ordermore » of magnitude higher than the kinetic collision frequency ..nu../sub e/a. The nature of the anomalous rf absorption is discussed.« less

Authors:
; ;
Publication Date:
Research Org.:
Institute of Nuclear Research, Academy of Sciences of the Ukrainian SSR
OSTI Identifier:
6279251
Resource Type:
Journal Article
Journal Name:
Sov. J. Plasma Phys. (Engl. Transl.); (United States)
Additional Journal Information:
Journal Volume: 6:5
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA; MICROWAVE RADIATION; ABSORPTION; CROSSED FIELDS; PLASMA SHEATH; TURBULENCE; ELECTROMAGNETIC RADIATION; RADIATIONS; 700108* - Fusion Energy- Plasma Research- Wave Phenomena

Citation Formats

Naumovets, V G, Pasechnik, L L, and Yagola, V V. Absorption of rf power by a plasma in a magnetic field. United States: N. p., 1980. Web.
Naumovets, V G, Pasechnik, L L, & Yagola, V V. Absorption of rf power by a plasma in a magnetic field. United States.
Naumovets, V G, Pasechnik, L L, and Yagola, V V. Mon . "Absorption of rf power by a plasma in a magnetic field". United States.
@article{osti_6279251,
title = {Absorption of rf power by a plasma in a magnetic field},
author = {Naumovets, V G and Pasechnik, L L and Yagola, V V},
abstractNote = {The absorption of rf power by a plasma in an alternating electric field and a constant magnetic field at right angles to one another has been studied experimentally. The plasma is produced between two coaxial cylinders (800 mm long and 12 and 70 mm in diameter, respectively), between which an rf voltage of frequency f = 7.4 MHz and of amplitude V up to 200 V is applied. The magnetic field H is varied over the range 0--1100 Oe. The discharge occurs in helium at a pressure in the range p = 10/sup -1/-10/sup -2/ torr. The plasma density n and the electron temperature T/sub e/ are (1--10) x 10/sup 10/ cm/sup -3/ and 4--10 eV, respectively. The rf power p absorbed by the plasma and the alternating electric field in the plasma, E, are measured for various values of H, V, and p. It is shown that at small values of p the power p is much higher than the calculated values at large values of H(>400--500 Oe) and V(>60--80 V). The effective electron collision frequency ..nu../sub eff/ found through by comparing the experimental and calculated values of P and independently from measurements of E are roughly an order of magnitude higher than the kinetic collision frequency ..nu../sub e/a. The nature of the anomalous rf absorption is discussed.},
doi = {},
journal = {Sov. J. Plasma Phys. (Engl. Transl.); (United States)},
number = ,
volume = 6:5,
place = {United States},
year = {1980},
month = {9}
}