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CO2 laser interferometer for electron density measurement in JT‐60U tokamak

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5 Author(s)
Kawano, Yasunori ; Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka‐machi, Naka‐gun, Ibaraki‐ken, Japan ; Nagashima, Akira ; Ishida, Shinichi ; Fukuda, Takeshi
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A tangential chord CO2 laser interferometer for electron density measurement in the JT‐60U tokamak is described. To compensate for a phase shift due to mirror vibrations, an IR‐HeNe laser interferometer is introduced. Probe beams of the CO2 and the IR‐HeNe lasers travel in a similar form for a distance of 100 m by utilizing relay optics. The effective phase resolution of the system is estimated to be 1/68 fringe, which corresponds to a line integrated density of 3.1×1018 m-2. An ultra‐accurate phase comparator which has a 1/104 fringe resolution is proposed to improve the capability of present and future interferometers.

Published in:

Review of Scientific Instruments  (Volume:63 ,  Issue: 10 )