Laser-triggered switch study
Rome Air Development Center, Research and Technology Division, Air Force Systems Command, 1966 - Technology & Engineering - 27 pages
The feasibility of developing a laser-triggered switch for use in line-type modulator service at a voltage holdoff level of 300 KV and at a conduction current level of 1000 amperes is being investigated. To date, current peaks as high as 2000 amperes have been easily obtained. Using anode arcs (the emitter at a positive potential with respect to the collector), a delay of approximately one microsecond occurs between the time when the laser illumination impinges on the emitter surface and the time when the switch turns on. The actual turn-on time has been observed to be about 100 nanoseconds. This turn-on time was inductance limited by the external circuitry in experiments performed to date. However, a fast-rise-time (
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3b CURRENT A-2 TDR MEASUREMENT A-3 TDR amount of material amperes anode arcs approval of RADC approximate energy density approximately 1 microsecond arcs the emitter atomic weight materials attenuated cathode arc characteristic impedance collector collector-emission delay conduction characteristics Cornell Aeronautical Laboratory Coulombs current peaks CURRENT THROUGH SWITCH Current Turn-On Delays Delays Showing Plasma DISCHARGING A 25 document is subject emitter material emitter surface Enter farad Figure 3a Figure A-3 FOCAL POSITION future experiments GAFB high voltage test inch joules/cm laser beam laser-triggered switch material removal Measurement of PFN nanoseconds neutral density filter OHM LOAD operation ordered or received peaks as high Plasma Transit-Time Delay pulse forming network pulse length report number rise-time Security Classification Showing Plasma Transit-Time shown in Figure special export controls specifications SPONSORING MILITARY switch turns SWITCH WHEN DISCHARGING Table A-I Tektronix transmittal to foreign tungsten Turn-On Delays Showing users shall request vacuum vacuum arc