Dual laser interferometer for plasma density measurements on large tokamaks |
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Authors: | Baker D R Lee S T |
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Affiliation: | General Atomic Company, San Diego, California 92138. |
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Abstract: | A two-wavelength plasma density interferometer utilizing a CO(2) 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. |
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