The
capillary discharge of a small current.
1. The pulse erosive discharge in a capillary
was carried out from the storage capacitor C = 0.75 mF (750 mF) through the resistor R = 700 Ohm and
throttle L = 7.6 mH, structurally combined with setting fire transformer.
Initial voltage of the capacitor UO = ~2.5 kV, final one UF
= ~ 2 kV, at the given length of a capillary UF depended on diameter of a capillary D and UO.
The discharder represented a cylindrical
aperture in a disk by thickness 36.5 mm polymethylmethacrylate (PMMA). The discharge
(top) part of this aperture had length lO = 24 mm and initial diameter DO = 1.6 mm,
which after a series of pulses was increased up to DF = ~3.5 mm. The
second (cathodic) part of an aperture in a disk had length lC = 12.5
mm and diameter dC = 2.2 mm. Being inserted in it, the graphite rod
in diameter 2.2 mm to a pencil was used as the cathode. As the anode the copper
plate with an aperture in diameter dA = 4 mm, through which the
plasma jet left, served.
2. Videoshooting of the discharge was carried
out by a camcoder SONY DCR TRV11E with 25 frame/s (50 field/s) at the function
"sport" and the minimal exposition tEXP = 1/300 s. Results
of videoshooting are submitted as a sequence of images (720 x 576 in folder CapDis.files,
the images have odd number) an interval between which T = 20 ms.
3. Fig. 1. Videoshooting of the capillary
discharge in a close to optimum mode.
4. Fig. 2. Videoshooting of the capillary
discharge in a not optimum mode.
5. Fig. 3. Separation of plasmoid from the discharge (1 variant).
Fig. 4. Separation of plasmoid from the discharge (2 variant).
Speed of a plasmoid's throwing-out in both variants about 10 m/s..
6. Fig. 5. On the
question of the current structure. One frame of the videoshooting made with UV
filter UV-6.
7. Fig. 6. Oscillations of the discharge current and voltage (R = 800 Ohm). Dynamics of amplitude and frequency of oscillations in the beginning of a pulse.
