Browsing by Subject "Trigger circuits"
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Item A new design concept for field distortion triggered spark gaps(Texas Tech University, 1986-12) Pashaie-Awal, BijanCommon field-distortion triggered spark gaps utilizing geometric field enhancement at sharp edges usually operate in a cascade mode via the trigger electrode. A new trigger concept is proposed allowing strong field enhancement and direct breakdown between the two main electrodes. A test device was designed to prove the feasibility of this concept. Experimental results on hold-off voltage and on delay and jitter dependent on percent breakdown voltage are presented. Best results achieved are a delay of 9 nanoseconds (ns) and a jitter of 2 ns at a self-breakdown voltage of 15 KV. The fields code ELF (Tetra Corporation, Albuquerque, NM) was used to verify the experimental results. An optimum location of the trigger electrode was calculated, and it matched the experimental data within a 5% accuracy. A full-scale field distribution graph was generated in both the triggered and the non-triggered cases, which are believed to represent the triggering action.Item Laser triggered spark gap using fiber optic transmission(Texas Tech University, 1981-05) Harjes, Henry CharlesThe use of an optical fiber in a laser triggering system is described. The fiber transmits a high power ruby laser pulse which triggers a high voltage spark gap. The spark gap is a gas switch on a water dielectric Blumlein generator which is pulse charged by a three stage Marx bank. Typical operating parameters for the spark gap are: 2 cm gap, 2700 Torr pressure, Ar-N^ gas mixture, and a charging voltage of 200 kV. The single strand, 1 mm, quartz, optical fiber is selected specifically for high power transmission capability. Laser pulses of 4 MW are coupled into and transmitted by the fiber with no observed damage. The overall optical system transmission efficiency is 62%. The triggering performance of the system is excellent in that switching delays of less than 10 ns and subnanosecond jitters are measured.