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Multichannel HCN interferometer for electron density profile measurements of tokamak plasmas

1977; Optica Publishing Group; Volume: 67; Issue: 7 Linguagem: Inglês

10.1364/josa.67.000964

2375-1037

D. Véron, J. Certain, J. P. Crenn,

Laser-Plasma Interactions and Diagnostics

A multichannel interferometer, designed for tokamak plasma-density measurements, is described. The phase shift experienced by the probing beam is transferred to a low-frequency signal obtained by Doppler shifting the frequency of the reference beam. This ensures a sensitivity of 10−2 fringe. The source is a cw HCN waveguide laser, with a 150-mW-output power. Eight channels are in operation on TFR. The variation of the line density as a function of time for each channel is deduced from the phase shift measurement by an on-line computer.