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- W2080652012 abstract "With the implementation of alternating discharges (ac) at the ISTTOK tokamak, the typical duration of the discharges increased from 35to250ms. This time increase created the need for a real-time electron density measurement in order to control the plasma fueling. The diagnostic chosen for the real-time calculation was the microwave interferometer. The ISTTOK microwave interferometer is a heterodyne system with quadrature detection and a probing frequency of 100GHz (λ0=3mm). In this paper, a low-cost approach for real-time diagnostic using a digital signal programable intelligent computer embedded system is presented, which allows the measurement of the phase with a 1% fringe accuracy in less than 6μs. The system increases its accuracy by digitally correcting the offsets of the input signals and making use of a judicious lookup table optimized to improve the nonlinear behavior of the transfer curve. The electron density is determined at a rate of 82kHz (limited by the analog to digital converter), and the data are transmitted for each millisecond although this last parameter could be much lower (around 12μs—each value calculated is transmitted). In the future, this same system is expected to control plasma actuators, such as the piezoelectric valve of the hydrogen injection system responsible for the plasma fueling." @default.
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- W2080652012 date "2008-10-01" @default.
- W2080652012 modified "2023-10-17" @default.
- W2080652012 title "Real-time digital heterodyne interferometer for high resolution plasma density measurements at ISTTOK" @default.
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- W2080652012 doi "https://doi.org/10.1063/1.2956875" @default.
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