Progress using collective Thomson scattering of microwave radiation to detect fast ions and plasma instabilities at the GDT open magnetic trap

For the big mirror magnetic trap (Gas-Dynamic Trap, Budker Institute, Russia), a system for recording of collective Thomson scattering spectra of microwave radiation has been developed to focus on the study of velocity distribution function of fast ions. A diagnostic complex includes a high-power 45...

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Bibliographic Details
Published in:Physics of plasmas 2024-12, Vol.31 (12)
Main Authors: Shalashov, A. G., Gospodchikov, E. D., Lubyako, L. V., Khusainov, T. A., Shmigelsky, E. A., Soldatkina, E. I., Solomakhin, A. L.
Format: Article
Language:English
Subjects:
Diagnostic systems
Distribution functions
Ion beams
Magnetohydrodynamic stability
Microwaves
Neutral beams
Plasma heating
Thomson scattering
Velocity distribution
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Summary:For the big mirror magnetic trap (Gas-Dynamic Trap, Budker Institute, Russia), a system for recording of collective Thomson scattering spectra of microwave radiation has been developed to focus on the study of velocity distribution function of fast ions. A diagnostic complex includes a high-power 450 kW/54.5 GHz gyrotron as a source of probing radiation, two independent highly sensitive radiometers operating in the range of 54.47 ± 0.55 GHz for simultaneous registration of scattered radiation in two orthogonal geometries, and quasi-optical systems for focusing the probing and diagnostic microwave beams. We report the results of the last experimental campaign of 2023 with plasma heating by neutral beams, in which the scattering signals from the fast ions have been detected accompanied by high-frequency instability of plasma.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0234887