Investigation of multicomponent plasma parameters by microwave methods

Investigations of plasma parameters in the pulsed reflex discharge were carried out at the facility having the following performance and operation conditions: mirror configuration with a pulsed magnetic field strength H0<;9 kOe; cathodes of 100 mm in diameter made of Cu with sputtered Ti; ignitor gas H2, Ar or gas mixture (Kr 88,89%; Xe 7%; N2 4%, Oζ 0,1%) was puffed into the chamber up to the pressure of 1-8 10"3 torr. Gas-metal plasma was formed as a result of the discharge at a voltage Ujis. = 3.5 kV (discharge duration ~ 1 ms, current Ijis, ~1.7 kA) in the medium of ignitor gas (mixture) and cathode sputtered material (Ti).The parameters of the gas-metal multicomponent plasma formed as a result of the pulsed reflex discharge (nρ ~ 1012-1014 cm"3) were investigated using a set of diagnostic methods and techniques. We have performed measurements of the following parameters and characteristics of the discharge-formed plasma: (1) time dependence of the average-density plasma in the range from 1012to 7 1013 cm"3; (2) electron density profile determined by the single wave reflection and the average-density change at a different frequency, and by the average density measurement at different chords; (3) rotational velocity of plasma in the poloidal direction determined by recording the fluctuations of signals reflected from equal-density layers spaced in the poloidal direction and by studying the autocorrelation function and the cross-correlation function of these signals; (4) electric strength determined by the value of a measured rotational velocity of plasma; (5) elemental composition of the plasma formed; (6) discharge current determined with the use of a Rogowski loop.