Far-infrared laser diagnostic on ELMO Bumpy Torus and extreme far-forward laser scattering on the Impurity Study Experiment

Journal Article · Wed May 01 00:00:00 EDT 1985 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138041· OSTI ID:5639666

Casson, W H; Hutchinson, D P; Ma, C H; Staats, P A; Wilgen, J B

A far-infrared (FIR) laser scattering diagnostic has been installed on the ELMO Bumpy Torus (EBT) experiment, and tests conducted on the system using a TPX Bragg cell show that the system is fully functional. Scattering experiments to date have shown only small detectable signal levels during normal operation and during ion cyclotron heating (ICH) fast-wave and slow-wave propagation experiments. On the Impurity Study Experiment (ISX), the output signal from the rf amplifiers of the FIR interferometer has been spectrum analyzed and shows frequency-shifted sidebands that correspond to extreme far-forward scattering of the laser beam as it passes through the plasma. Although the scattered signal cannot be resolved spatially, the scattered intensity provides information about density fluctuation levels and MHD activity during different modes of operation. Agreement has been found with measurements made by the x-ray diagnostic and the heavy-ion beam probe.

• Research Organization: University of Tennessee, Knoxville, Tennessee 37916
• OSTI ID: 5639666
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 56:5
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELMO BUMPY TORUS
LIGHT SCATTERING
PLASMA DIAGNOSTICS
ISX TOKAMAK
INTERFEROMETRY
FAR INFRARED RADIATION
ICR HEATING
IMPURITIES
INTERFEROMETERS
ION PROBES
LASER RADIATION
OPERATION
SPATIAL RESOLUTION
WAVE PROPAGATION
X RADIATION
BUMPY TORI
ELECTROMAGNETIC RADIATION
ELMO DEVICES
HEATING
HIGH-FREQUENCY HEATING
INFRARED RADIATION
IONIZING RADIATIONS
MAGNETIC MIRRORS
MEASURING INSTRUMENTS
OPEN PLASMA DEVICES
PLASMA HEATING
PROBES
RADIATIONS
RESOLUTION
SCATTERING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics