Poloidal rotation in Alcator C

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138777· OSTI ID:5642203

Benjamin, R D; Terry, J L; Moos, H W

The poloidal rotation velocity in the edge region of ohmically heated Alcator C plasmas was measured using the Doppler shift of impurity emission lines. The measurements were made using a high-resolution, photon counting detector, sensitive to wavelengths from --1200 to --2000 A-circle, mounted in the exit plane of a 1-m Ebert--Fastie spectrometer. The transitions used were the 2s-italic2p-italic /sup 1/P-italic/sup 0//sub 1/--2p-italic/sup 2/ /sup 1/D-italic/sub 2/ at 1371.292 A-circle in O V and 2s-italic /sup 2/S-italic/sub 1//sub ///sub 2/--2p-italic /sup 2/P-italic/sup 0//sub 1/2/ at 1242.804 A-circle in N V, both of which exist near the limiter radius in Alcator C. The measured rotation velocity is --4.1 x 10/sup 5/ +- 2.1 x 10/sup 5/ cm/s at n-bar/sub e-italic/--1.7 x 10/sup 14/ cm/sup -3/ in the direction of the electron diamagnetic drift and is --1.4 x 10/sup 5/ +- 2.5 x 10/sup 5/ cm/s at n-bar/sub e-italic/--2.3 x 10/sup 14/ cm/sup -3/ in the ion diamagnetic drift direction, although the error bars associated with this last measurement do not preclude the possibility of zero rotation or rotation in the electron diamagnetic drift direction.

• Research Organization: Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
• OSTI ID: 5642203
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:8; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALCATOR DEVICE
CLOSED PLASMA DEVICES
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
IMAGE INTENSIFIERS
IMPURITIES
ION DRIFT
MEASURING INSTRUMENTS
MOTION
OPTICAL SPECTROMETERS
PHOTODIODES
PLASMA DIAGNOSTICS
RADIATIONS
RESOLUTION
ROTATION
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SPECTROMETERS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
ULTRAVIOLET RADIATION