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Fig. 6.3
Longitudinal high-frequency plasmoids at different mass flow rates Q . Vortex airflow,
P st
40 Torr, P HF
800 W
Longitudinal Plasmoid Parameters Measured
by a High-Speed Optic Interferometer
The longitudinal plasmoid evolution and its structure in swirl flow at the pulsed
repetitive high-frequency power pumping was studied by both the high-speed cam-
era and the optical interferometer simultaneously (Fig. 6.4 ) (Klimov and Moralev
2008 ; Klimov 2004 ; Klimov et al. 2009a , 2010 , 2011 ; Bityurin et al. 2010 ).
Note that a stable longitudinal vortex plasmoid was created at the pulse repetitive
high-frequency power pumping was swirl flow at high modulation frequency
F M > F M * 1 kHz (pulse duration T i D 0.5 ms) only.
It is shown that the first high-frequency power pulse (of the pulsed repetitive
capacity-coupled high-frequency discharge) creates a hot longitudinal vortex plas-
moid (plasma kernel) near the vortex axis and a warm plasma cover (a halo or
a low-density cavern) around it. A longitudinal vortex plasmoid consists of the
longitudinal plasma filament ( F ) and the plasma corona ( C ) near its top. The second
high-frequency filament, created by the new high-frequency pulse, propagates in
this hot cavern created by the previous high-frequency pulse. The head propagation
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