This article considers a four-frequency microwave Doppler backscattering (DBS) system in the compact spherical tokamak Globus-M. The hardware was adequate for the purposes of studying the peripheral plasma in the tokamak. The multichannel DBS system is based on duplication of a dual homodyne detection circuit for four incident Ka-band frequencies. The ray tracing results for a spherical torus are described, and specific requirements for the antenna tilt adjustment are defined. Some new experimental results are given for using DBS diagnostics on the Globus-M tokamak in order to illustrate its efficiency.
Doppler backscattering diagnostic with dual homodyne detection on the Globus-M compact spherical tokamak
V. V. Bulanin, A. Y. Yashin, A. V. Petrov, V. K. Gusev, V. B. Minaev, M. I. Patrov, Y. V. Petrov, D. V. Prisiazhniuk, V. I. Varfolomeev; Doppler backscattering diagnostic with dual homodyne detection on the Globus-M compact spherical tokamak. Rev. Sci. Instrum. 1 March 2021; 92 (3): 033539. https://doi.org/10.1063/5.0030307
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