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Fig. 6.1 Experimental setup SWT-1. 1 vortex generator, 2 quartz tube, 3 high-frequency electrode,
5 port with pressure sensor, 4 external grounded electrode, 6 vacuum chamber, 7 to high HF power
supply, 8 current probe, 9 HF modulator, 10 - 12 command generator, 13 pressure manometer,
14 gas injector pressure manometer
The modified setup SWT-1F was used to study free longitudinal vortex plasmoids
in the open atmosphere. The high-frequency plasma generator used in this work has
the following parameters: high frequency, F HF , D 13.6 MHz, high-frequency power,
P HF , <2 kW, and two operation modes, a continuous mode and the pulse repetitive
one. DC discharge was also used in some experiments ( U DC < 8kV, I DC < 2A).
The typical parameters of the pulsed repetitive high-frequency generator used in
this work are the following: a maximal output pulsed voltage is 60 kV, pulsed HF
power was 1-10 kW, high frequencies are F HF1 D 13.6 MHz, F HF2 D 0.45 MHz,
pulse repetitive frequency was F M D 10-10 4 Hz, and pulse duration is T i D 10 sto
100 ms.
Plasma and airflow parameters were measured by different diagnostic instru-
ments including a shadow optical device with the excimer KrF laser (œ D 248 nm),
an optical interferometer with a high-speed camera, Citius (œ D 638 nm), a voltage
probe and current probe, an optical spectrometer (œ D 200-800 nm), an MW
interferometer G4-108 (œ D 1cm),etc.
Vortex Longitudinal Plasmoid Created
by the Capacity-Coupled High-Frequency Discharge
A homogeneous longitudinal subcritical vortex plasmoid, created by a capacity-
coupled high-frequency discharge in swirl airflow at continuous high-frequency
discharge power pumping, is shown in Fig. 6.2 . The typical length of this plasmoid
varies from 30 to 150 cm at different high-frequency power values. Its diameter is
about 10-15 mm.
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