Speaker
Vladislav Sklyarov
(Budker Institute of Nuclear Physics SB RAS)
Description
The motivation of the research activity at the GOL-3T device [1] is to study sub-THz wave generation in a plasma column due to intense relativistic electron beam-plasma interaction [2]. To solve this task, a special complex of diagnostics was developed. This complex is intended to measure main plasma and beam parameters and also the characteristics of the electromagnetic waves.
The plasma density is measured in two cross-sections of the plasma column by two laser diagnostics. One of them is Michelson interferometer [3] based on CO2 laser (10.6 μm). The other one is Thomson scattering system [4] based on Nd:YAG-laser. The scattering system gives the density in 9 local areas over the diameter of the plasma column with temporal resolution. The increase in the plasma pressure during the beam passing through the plasma column is measured by diamagnetic probes located in various cross sections along the axis of the device. The electron beam currents in various parts of the device are measured by a set of Rogowski coils. The energy of the injected electrons beam is calculated from the measurements of an accelerator diode voltage. The angular spread of the beam electrons and their energy distribution are measured in some additional experiments.
The EM-radiation at 100 - 500 GHz frequency bandis registered by detectors based on Schottky barrier diodes [5]. The spectral power density of the radiation in this interval is analyzed by an 8-channel polychromator. Additionally, a set of single detectors arranged along the length of the plasma column are used to obtain the axial distribution of the radiation power. The radiation power of frequencies upper than 500 GHz is registered by a calorimeter (Thomas Keating Limited) and a special superconducting detector. The electromagnetic wave emission along the column axis is measured by means of mirrors reflecting the radiation in the direction perpendicular the axis at the end of the trap.
This research was financially supported by RSCF under Project No. #14-12-00610 for the investigation of sub-terahertz emission from plasmas. The upgrade of the radiometric system was funded by RFBR Grant 14-02-31225-a and the Ministry of Education and Science of RF under the State Assignment Contract No. #3002.
[1] Arzhannikov A.V. et al. Plasma System of the GOL-3T Facility // Plasm. Phys. Rep., V41, N11, 863 (2015).
[2] Tsytovich V.N. Theory of Turbulent Plasma
[3] Popov S.S. et al. Upgrading of Thomson Scattering System for Measurements of Spatial Dynamics of Plasma Heating in GOL-3 // Fusion Science and Technology, V59, 1T, 292 (2011).
[4] Burmasov V.S. et al. Infrared interferometer for investigation of subthermonuclear plasma in multimirror trap GOL-3 // Instruments and Experimental Techniques, 2012, Vol. 55, No. 2, pp. 259-262.
[5] Arzhannikov A.V. et al. Diagnostic system for studying generation of subterahertz radiation during beam-plasma interaction in the GOL-3 facility // Plasm. Phys. Rep., 2012, Vol. 38, No 6, p. 450-459.
Primary author
Vladislav Sklyarov
(Budker Institute of Nuclear Physics SB RAS)
Co-authors
Dr
Alexander Burdakov
(Budker Institute of Nuclear Physics SB RAS)
Mr
Alexandr Kasatov
(Budker Institute of Nuclear Physics SB RAS)
Prof.
Andrey Arzhannikov
(Novosibirsk State University)
Andrey Rovenskikh
(Budker Institute of Nuclear Physics SB RAS)
Dr
Ivan Ivanov
(Budker Institute of Nuclear Physics SB RAS)
Dr
Leonid Vyacheslavov
(Budker Institute of Nuclear Physics SB RAS)
Maksim Makarov
(Budker Institute of Nuclear Physics SB RAS)
Mr
Sergei Kuznetsov
(Novosibirsk State University)
Dr
Stanislav Sinitsky
(Budker Institute of Nuclear Physics SB RAS)
Dr
Vladimir Burmasov
(Budker Institute of Nuclear Physics SB RAS; Novosibirsk State University)
Dr
Vladimir Postupaev
(Budker Institute of Nuclear Physics SB RAS)
