Data recording system of a dispersion interferometer based on a CO2 laser

Khil'chenko, A. D.; Kvashnin, A. N.; Ivanenko, S. V. I.; Zubarev, P. V.; Moiseev, D. V.; Kovalenko, Yu. V.
May 2009
Instruments & Experimental Techniques;May2009, Vol. 52 Issue 3, p382
Academic Journal
The data recording system of a multichannel double-pass dispersion interferometer based on a CO2 laser is described. This system has been designed to record the linear density of plasmas in a real-time mode with a time discreteness of 4 μs and resolution 〈 N e L〉 ∼ 0.34 × 1013 cm−2 ( N e is the electron component of the plasma density, and L is the plasma size in the wave propagation direction) in the range of linear density variations of up to 1017 cm−2. The system is built from unified recording modules that use fast ADCs to record the shape of photodetector and modulator signals and FPGA-based digital units of dataflow processing to form results of measurements. The single-channel recording module of the dispersion interferometer has been tested under actual experimental conditions of the GDL gas-dynamic trap and the TEXTOR tokamak (Julich, Germany).


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