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Kurskiev, G.S.; Chernakov, Al.P.; Solovey, V.A.; Tolstyakov, S.Yu; Mukhin, E.E.; Koval, A.N.; Bazhenov, A.N.; Aleksandrov, S.E.; Zhiltsov, N.S.; Senichenkov, V.A.; Lukoyanova, A.V.; Chernakov, P.V.; Varfolomeev, V.I.; Gusev, V.K.; Kiselev, E.O.; Petrov, Yu.V.; Sakharov, N.V.; Minaev, V.B.; Novokhatsky, A.N.; Patrov, M.I.; Gorshkov, A.V.; Asadulin, G.M.; Bel’bas, I.S.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 05/2020, Volume: 963Journal Article
The paper describes the digital filter polychromator developed for Thomson scattering (TS) diagnostics. The device having ultra-low noise, high-speed detection system and up to 7 spectral channels is equipped with digitizer and single board computer for system control and data processing. The data acquisition system is capable to detect very short laser pulses of few ns width with low magnitude. This feature opens up new possibilities for the TS diagnostics design in modern fusion devices, which includes: operation with high background illumination, measurement of very low electron temperature and density at the plasma edge and scrape-off layer (SOL), separation of the TS signal and the stray light coming with a delay of several ns. The analysis of the TS signal waveform also gives a possibility to distinguish the TS and Mie scattering from the dust particles that is important for measurements in SOL. Owing to compactness and ultra-low energy consumption both optical and data processing units interfaced with optical Gigabit Ethernet were combined in a stand-alone device. Such all-in-one design with optical fiber input and optical digital output provides enhanced resistance to electromagnetic disturbances and simplify operation. A set of such polychromators can be mounted in a standard 19” rack and can be integrated with outer CODAC (Control, Data Access and Communication) system. Testing of the polychromators at the Globus-M2 tokamak has shown excellent performance of the developed serial devices.
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