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Study of mode-converted and directly-excited ion Bernstein waves by CO/sub 2/ laser scattering in Alcator C

Conference · · AIP Conf. Proc.; (United States)
OSTI ID:7020748
; ; ; ; ; ;
Mode-converted and directly excited ion Bernstein waves (IBW) were studied using CO/sub 2/ laser scattering in the Alcator C tokamak. During the ICRF fast wave heating experiments, mode-converted IBW was observed on the high-field side of the resonance in both second harmonic and minority heating regimes. By comparing the relative scattered powers from the two antennas separated by 180/sup 0/ toroidally, an increased toroidal wave damping with increasing density was inferred. In the IBW heating experiments, optimum direct excitation is obtained when an ion-cyclotron harmonic layer is located just behind the antenna. Wave absorption at the ..omega.. = 3..cap omega../sub D/ = 1.5..cap omega../sub H/ layer was directly observed. Edge ion heating was inferred from the IBW dispersion when this absorption layer was located in the plasma periphery, which may be responsible for the observed improvement in particle confinement.
Research Organization:
Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139
OSTI ID:
7020748
Report Number(s):
CONF-870570-
Conference Information:
Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 159:1
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
ALCATOR DEVICE
ANTENNAS
BERNSTEIN MODE
CARBON DIOXIDE LASERS
CLOSED PLASMA DEVICES
CONVERSION
CYCLOTRON HARMONICS
ELECTRICAL EQUIPMENT
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EXCITATION
GAS LASERS
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
LASERS
LIGHT SCATTERING
OPTICAL DISPERSION
OPTIMIZATION
OSCILLATION MODES
OSCILLATIONS
PLASMA
PLASMA DIAGNOSTICS
PLASMA HEATING
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES