Development of a tunable multi-channel Doppler reflectometer on J-TEXT tokamak
Doppler reflectometer is a powerful diagnostic tool to study the turbulence for tokamak plasmas. It can provide information on the density fluctuation, the poloidal rotation, the radial electric field, its shear, etc. A tunable multi-channel V-band (50-75 GHz) Doppler reflectometer system has been d...
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Published in | Review of scientific instruments Vol. 92; no. 3; p. 033545 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.03.2021
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Online Access | Get more information |
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Summary: | Doppler reflectometer is a powerful diagnostic tool to study the turbulence for tokamak plasmas. It can provide information on the density fluctuation, the poloidal rotation, the radial electric field, its shear, etc. A tunable multi-channel V-band (50-75 GHz) Doppler reflectometer system has been developed on the J-TEXT tokamak for the measurement under various toroidal magnetic fields. A universal serial bus controlled synthesizer is used as a source that can adjust the probing frequency remotely. This Doppler reflectometer can measure the plasma in 0.3 < ρ < 1 . Its radial resolution is <2 cm, and k
is ∼ 4-12 cm
. Based on the Doppler reflectometer, the perpendicular turbulence propagation velocity, the profile of the radial electric field, the geodesic acoustic mode, and some other phenomena have been observed on J-TEXT. |
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ISSN: | 1089-7623 |
DOI: | 10.1063/5.0040915 |