A gap switch and method based on multi-point triggering of axial and radial laser beams

Abstract

The invention discloses a gap switch and method based on multi-point triggering of axial and radial laser beams. Facing DC high-voltage long air gaps, a laser beam propagating along the electric field line direction (axial direction) and a beam or Multiple radial laser beams propagating perpendicular to the direction of the electric field lines (radial direction) induce the formation of a series of initial plasmas distributed along the electric field lines at the electrode axis, thereby causing breakdown of the long air gap. The energy of each laser beam, the timing of feeding into the gap, and the axial position of the radial laser plasma can all be adjusted through the optical system to match the development of the discharge channel when the gap breaks down. Through the above-mentioned design method, the present invention can make the total length of the induced plasma channel longer and more widely distributed in the gap, thereby improving the performance of laser triggering.

Description

technical field [0001] The invention belongs to the technical field of switch devices, and in particular relates to a gap switch and a method based on multi-point triggering of axial and radial laser beams. Background technique [0002] The laser trigger switch essentially uses a high-power pulsed laser to generate plasma in the gap (or the electrode surface), distorting the local electric field and causing the entire gap to break down. The laser trigger switch has the advantages of small trigger delay and jitter, low self-breakdown probability, stable operation, suitable for synchronous triggering, etc., and plays an important role in the field of pulse power technology. The largest pulse power device in the world - the Z device (26MA, 100ns) of Sandia National Laboratory in the United States, including 36 synchronously operating 6MV laser trigger switches; my country's largest pulse power device "Julong No. 1" includes 24 synchronous Operation of the 4MV laser trigger swit...

AI Technical Summary

Problems solved by technology

Although the application requirements in the power system can relax the trigger jitter to 1-10μs, the gap distance at this time is much longer than the laser plasma length, which will weaken the effect of the laser plasma on the electric field distortion between the gaps and the guiding ability of the gap discharge channel is also greatly weakened, thereby affecting the performance of the laser-triggered

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