MHD plasma activity in the U-3M torsatron during the RF cleaning mode with the magnetic field Bφ(0) = 0.02 T

• Date: 2019
• Main Authors: Pashnev, V.K., Sorokovoy, E.L., Petrushenya, A.A., Ozherel’ev, F.I.
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2019
• Series: Вопросы атомной науки и техники
• Subjects: Magnetic confinement
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/194581
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: 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 // Problems of atomic science and tecnology. — 2019. — № 1. — С. 20-22. — Бібліогр.: 15 назв. — англ.

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 poloidal 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.