Study on the turbulce of fast linear theta-pinch plasma on the base of deuterium spectral line Stark broadening

The analysis of spectral lines of Dsub(α) and Dsub(β) deuterium atoms emitted by a plasma of the UTRO theta-pinch device at the stage of fast (0.4 μs) compression idicaes the presence of intensive low-frequency plasma oscillations with an average amplitude E0 approximately 200 kV/cm and an extremely small spread of amplitudes ΔE0/E0 < or approximately 0.1 . At this stage of the plasma filament compression down to approximately 2 cm size the magnetic field was equal to approximately 40 kGs. Electron concentration was approximately 5x1016-2x1017 cm-3 and the ion temperature approximately 300 to 600 eV. X radiation with quantum energy up to 50 keV was detected. The experimental data could be explained on assumption that a sWing of the close group of low-hybrid drift instability modes occurs in a plasma. Such turbulence is capable to effectively accelerate the electrons at small pitch-angles along the magnetic field by the resonance diffusion mechanism which can be the caUse of emergence of X radiation observed at a maximum compression stage