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- W2014400269 abstract "An electronic circuit has been developed which performs real-time density computation on the quadrature phase signals of the two-color CO2 interferometer for the RFX experiment. Cartesian to polar coordinate conversion is obtained by a look-up table, and a ‘‘phase fine tuning’’ table allows us to introduce corrections to the systematic phase nonlinearity errors of the interferometer, by which the overall accuracy of the diagnostic is made better than 1°, equivalent to a line density of 6×1017 m−2 for a CO2 system. The phase total range is ±512 fringes and the maximum allowed rate of change is 125×103 m−2 s−1 equivalent to a density rate of change of 2×1025 m−2 s−1. A real-time signal proportional to the plasma density to be used for density feedback is provided by a 50 kHz, 12 bit converter. The system is a triple width CAMAC module and the two-color wavelength ratio is remotely programmable as a 20 bit constant, hence it is suitable in general for any two-color interferometer. The density data are also stored with a sampling rate of 10–250 kHz in a 128 K×24 bit memory buffer, which is interfaced via a CAMAC bus to the data acquisition system." @default.
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- W2014400269 date "1990-10-01" @default.
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- W2014400269 title "Real‐time density computer for two‐color interferometers" @default.
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- W2014400269 doi "https://doi.org/10.1063/1.1141812" @default.
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