Abstract
A 10 MSample/s analog-to-digital converter has been used to analyze the signals from the double wavelength heterodyne interferometer (CO2 10.6 μm, HeNe 0.63 μm) in the TJ-II stellarator. The phase difference between the two interferometers has been calculated using a new algorithm in Labview environment. A systematic study of the 1 MHz intermediate frequency has been done using our software and Labview tools. Different sources of noise and nonlinear effects have been analyzed. Crosstalk (from the reference path) has been detected and corrected by software. The complete system (single channel double pass) has been routinely working during the complete TJ-II autumn experimental campaign, providing the plasma line integral density in scenarious with average densities ranging from few 1018 m−3 to more than 5×1019 m−3. The results have been compared with those from a 2 mm interferometer, obtaining an excellent agreement. Working with a final bandwidth of 4 kHz, a one pass line integral error level about ±−2×1017 m−2 has been achieved.
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