Poloidal rotation velocities in the outer half of Alcator- C plasmas

Journal Article · Mon Jan 15 04:00:00 EST 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.1034· OSTI ID:6894831

Benjamin, R D; Terry, J L; Moos, H W ^[1]

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1. Department of Physics and Astronomy The Johns Hopkins University, Baltimore, Maryland 21218 (USA)

Poloidal rotation velocities in the outer half of ohmically heated Alcator-{ital C} plasmas have been determined from the Doppler shift of impurity emission lines. The measurements were made using a high-resolution photon-counting detector, sensitive to wavelengths from {similar to}1200 to {similar to}2000 {Angstrom}, mounted in the exit plane of a 1-m Ebert-Fastie spectrometer. The following transitions were used: 2{ital s}2{ital p}{sup 1}{ital P}{sup 0}{sub 1}--2{ital p}{sup 2} {sup 1}D{sub 2} at 1371.292 {Angstrom} in O V, 2{ital s} {sup 2}{ital S}{sub 1/2}--2{ital p}{sup 2}{ital P}{sup 0}{sub 1/2} at 1242.804 {Angstrom} in N V (both of which exist near the limiter radius in Alcator-{ital C}), and 1{ital s}2{ital s} {sup 3}S{sub 1}--1{ital s}2{ital p} {sup 3}P{degree}{sub 2} at 1623.63 {Angstrom} in O VII (which exists at {ital r}/{ital a}{similar to}0.8). The measured rotation velocities are 4--5{times}10{sup 5} cm/s in the direction of the electron diamagnetic drift at the radius of the O V emission shell and {similar to}6{times}10{sup 5} cm/s at the radius of the O VII emission shell, again in the electron diamagnetic drift direction. Therefore poloidal rotation of the outer half of the Alcator-{ital C} plasma with a velocity of several times 10{sup 5} cm/s in the direction of the electron diamagnetic drift is firmly established by these measurements.

• DOE Contract Number: AC02-76ET53006
• OSTI ID: 6894831
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Journal Issue: 2 Vol. 41:2; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
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ALCATOR DEVICE
ANGULAR VELOCITY
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
DOPPLER EFFECT
ELECTRIC HEATING
HEATING
HOT PLASMA
IMPURITIES
JOULE HEATING
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PLASMA HEATING
RESISTANCE HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VELOCITY