A laser triggered high-frequency high power microwave cavity switch
An experimental, laser-triggered microwave switch is described which is based upon the interaction between an electromagnetic wave and a laser-induced electron and ion beam in the gap of a re-entrant microwave cavity. Peak power at X-band up to 60 kw, 0.5 microseconds pulse width and 5000 cps repetition rate was switched, and two regimes of operation were studied: a thermionic regime in which ion generation was at a minimum, and a plasma regime in which both electrons and ions were produced in quantities of about the same order of magnitude. The thermionic regime was examined experimentally and the results compared well with the theoretical results predicted by C. C. Wang's theory for high-frequency, high-power, thermionic vacuum tubes. The plasma regime was also examined experimentally. It was found that this regime had better switching properties than the thermionic regime. (Author).
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amplitude Beam-loaded Cavity beam-loading admittance Beam-loading Conductance Cathode Tip Cathode-induced Current cavity gap cavity resonant cold cavity convection current corresponding current pulse curve density detuning diode displacement current electrons and ions emission current experimental frequency modulation Function H H H H rH H ro hafnium carbide high-power Induced Cathode Current Interaction Phenomena joules KLYSTRON kw peak power laser beam laser flash tube laser head laser power laser-induced low-frequency Lower Trace magnetron maximum Mc/s microwave microwave power mode of operation normalization constant OJ OJ Operating Frequencies oscillograms OSCILLOSCOPE peak r-f power phase angle phototube plasma regime power absorbed power levels power output power supply presented in Figure r-l rH Re-entrant Cavity reflected power resonant frequency rH H rH rH shown in Figure shows space-charge TEKTRONIX Test Setup Thermionic Emission thermionic regime trace displays trigger tungsten upper trace V/cm Wang's theory WAVEGUIDE X X X