MHD PLASMA ACTIVITY IN THE U-3M TORSATRON DURING THE RF CLEANING MODE WITH THE MAGNETIC FIELD Bϕ(0) = 0.02 T

V.K. Pashnev, E.L. Sorokovoy, A.A. Petrushenya, F.I. Ozherel'ev
2019 Problems of Atomic Science and Technology  
In the considered mode of cleaning, plasma was created and heated by antennas at frequencies fRF1 ≈ 7.9 and fRF2 ≈ 8.8 MHz, the magnitude of the constant magnetic field was Bϕ(0) ≈ 0.02 T, so that the ion cyclotron frequency was much lower than the heating frequency. The average plasma density was n ~ 1×1018 m-3, electron temperature was ~10 eV, working gas pressure was 10-4 Torr. Using a set of 15 magnetic sensors installed in one of the poloidal sections of the torus, fluctuations of the
more » ... dal magnetic field were recorded. It was found that in the investigated frequency range 0...100 kHz, the spectrum of fluctuations of the poloidal magnetic field has two characteristic frequencies 6 and 49 kHz. The dynamics of the intensity of the magnetic plasma fluctuations for the investigated frequencies was also studied.
doi:10.46813/2019-119-020 fatcat:wnolrx5hyve6ppwjsmsu5p2dyi