Dual laser interferometer for plasma density measurements on large tokamaks
- 1 July 1978
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 49 (7), 919-922
- https://doi.org/10.1063/1.1135492
Abstract
A two‐wavelength plasma density interferometer utilizing a CO2 laser and an HeNe laser is described. The interferometer is being designed for use on Doublet III, a large noncircular cross‐section tokamak. The use of the two wavelengths allows the distinction between fringe shifts due to plasma density and fringe shifts due to mirror vibrations. Plasma density fringe shifts of 1/10 of a fringe shift can be measured in the presence of mirror vibrations which cause several fringe shifts. A simple digital phase comparing electronic system is used.Keywords
This publication has 4 references indexed in Scilit:
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- Tokamak devicesNuclear Fusion, 1972
- CO2-Laser Interferometer for the Measurement of Transient Low-Density PlasmasReview of Scientific Instruments, 1969
- A ZEBRA-STRIPE DISPLAY FOR AN OPTICAL INTERFEROMETER, AND ITS USE TO MEASURE PLASMA DENSITY IN THE PRESENCE OF VIBRATIONApplied Physics Letters, 1964