Geoscience Reference
In-Depth Information
Fig. 6.3
Longitudinal high-frequency plasmoids at different mass flow rates
Q
. Vortex airflow,
P
st
40 Torr,
P
HF
800 W
6.5
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
