Two-dimensional phase contrast interferometer for fluctuations study on LHD

C O 2 laser based phase contrast interferometer was used previously on LHD to study plasma density microfluctuations. New two-dimensional 6×8 elements array of CdHgTe photoconductors was employed for detection. In addition to commonly measured intensity, frequency spectrum, and two-point correlation...

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Bibliographic Details
Published in:Review of Scientific Instruments 2004-10, Vol.75 (10), p.3439-3441
Main Authors: Sanin, A. L., Tanaka, K., Vyacheslavov, L. N., Kawahata, K., Akiyama, T.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON DIOXIDE LASERS
FLUCTUATIONS
INTERFEROMETERS
LHD DEVICE
PHOTOCONDUCTORS
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
TOKAMAK DEVICES
ULTRASONIC WAVES
VISIBLE RADIATION
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Summary:C O 2 laser based phase contrast interferometer was used previously on LHD to study plasma density microfluctuations. New two-dimensional 6×8 elements array of CdHgTe photoconductors was employed for detection. In addition to commonly measured intensity, frequency spectrum, and two-point correlation two-dimensional detector array allows determining the direction of propagation of waves in plasma. From the angular distribution it is possible to obtain localized along the viewing line properties of fluctuations using strong magnetic shear in LHD. As a result, the radial profiles of density microfluctuations can be obtained with 1 μ s temporal resolution determined by detector bandwidth. The described scheme was tested using ultrasonic wave in air. New imaging diagnostics has been installed on LHD and first experimental results are reported.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1784528