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• W2048458578 abstract "The influence of magnetic field strengih on the probedetermined characteristics of a discharge with an incandescent cathode was studied. The probes were established in the anode plane outside the beam of primary electrons. It was found that the ratio I/sub c//I/sub i/, of the saturation electron current to the ion saturation current, varies irregularly with the increase of the magnetic field. At a certain critical value of the field, I/sub c//I/sub i/ suddenly increases by approximately one order. The osciliograms of the probed characteristics showed that in the vicinity of the critical value of the magnetic field there arise in the discharge intensive oscillations with frequencies approximates 10/sup 4/ Hz which oscillations diminish both the electron and ion branch of the oscillograms. The critical magnetic field depends on the kind of gas (H/sub 2/, N/sub 2/, A) and increases approximately linearly with the pressure in an interval from 10/sup -3/ to 10/sup -2/ mm Hg. While studying the phase relations between the variable componert currents in the probes, it was established that when there is a critical magnetic field, a stationary rotating plasma torch is formed which tears itseif away from the primary beam. The plasma concentration in the torchmore » is considerably greater than outside the torch. The period of rotation of the torch is in agreement with the drift velocity value and diminishes with increasing magnetic fleld in the interval from 100--30 mu s at H = 1 to 3 x 10/sup 3/ oersteds, respectively. For the purpose of a more detailed and graphic study of the processes of crention and motion of plasma across a magnetic field, we have developed a device called a plasmascope. The plasmascope represents a plane electron-optical system consisting of two parallel fine grids and a luminous screen. The first grid of the plasmascope is the anode of the discharge. A non-transluscent aluminum film having a thickness of 200 to 500 millimicrons was placed on the luminous screen above the phosphor layer. The plasmascope can work in two conditions of operation. In the condition of electron'' image the second mesh has the anode potertial and is an electrostntic screen. The electrons from the plasma passing through both grids are accelerated in the gap between the second grid and the screen by a positive pulsed voltage and they cause the phosphor to glow. In the condition of ion'' image a negative pulse is placed on the second grid and the screen is at the anode potential. The glow of the phosphor is caused by the secondary electrons expelled by the ions from the second grid. The plasmascope works under conditions of regularly repeated pulses having a frequency of 0 to 50 Hz. A negative pulse with an amplitude from 0 to 500 v and with a duration from 10 to 100 mu s is supplied to the cathode of the discharge. The brightening (intensity gate, bias lighting) pulse having an amplitude of 10 kv and a duration of 1 to 3 mu s is supplied to the screen or to the second grid with a deliberately regulated delay after switching the discharge pulse. The polarity of the pulse varies, depending on the conditions of operation. Thus we observe the successive stages of development of the discharge and the successive stages of transverse motion of the plasma with a retardation of 10/sup 6/ or more. (auth)« less" @default.
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• W2048458578 date "1967-12-08" @default.
• W2048458578 modified "2023-09-23" @default.
• W2048458578 title "TRANSVERSE MOTION OF PLASMA IN A MAGNETIC FIELD" @default.
• W2048458578 hasPublicationYear "1967" @default.
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