Electron emission prom the cathode during the initial phase of a nanosecond vacuum discharge

Characteristics of a silicon carbide field emission array under pre-breakdown conditions

“…In Ref. [11], four phases of current formation during vacuum breakdown were considered: the first phase is pre-breakdown, which consists in heating the emitter by field emission current, the second phase is the explosive destruction of the emitter and a sharp increase in current , the third phase is a relatively slow increase in current due to the emission of electrons from the cathode plasma, the fourth phase is an increase in current after the plasma bridges the vacuum gap. In Ref.…”

The full-voltage effect and the optimal modes of the pulsed conditioning of electrodes in a vacuum

“…The efficiency increases by a factor of as much as 30 by reducing the pulse duration and raising the optimal regime's pulse power. Cu [3][4][5][6][7]11] Al [3,[5][6][7] Mo [5,6] Ni [4] Fe [8,9] Cr [3][4][5][6][7]11] Cu [12] The electric strength and the quality of the cathode surface of the vacuum gaps formed by plane-parallel copper electrodes having diameters of 14 (the anode) and 12 mm (the cathode) and conditioned by breakdowns at pulses with t p = 5 ms (the pulse front duration t f = 0.55 ms) at a residual pressure P = 3 · 10 -5 Pa were studied in [12]. These data were obtained upon changes in the interelectrode gap over the range 3 µ m ≤ d ≤ 2.5 mm spanning three orders of magnitude.…”

“…Figure 3 shows K β plotted from the above data as a function of the pulse duration, compared to long voltage pulses in gaps of centimeter width (curve 1) and at Cu [3][4][5][6][7]11] Al [3,[5][6][7] Mo [5,6] Ni [4] Fe [8,9] Cr [3][4][5][6][7]11] Cu [12] an identical gap width (curve 2). The experimental points reflect the increase in the voltage across the accelerating gap (between the microchannel plate (Cr) and a screen of microchannel image intensifiers), at which local flashes of fluorescence appear on the screen [10], and in the electric strength of the vacuum capacitors (Cu) [11] as a result of the optimal regimes of conditioning with pulses in the nanosecond range.…”

“…Taking into account the value of the interelectrode gap 3 µ m ≤ d ≤ 20 cm in the time delay experiments in [3][4][5][6][7][8][9][10][11], we plotted the breakdown electric strength E 0 as a function of the gap width d used in conditioning electrodes with pulses t p ≈ t d . The function E 0 ( d ) is shown in Fig.…”