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170-kV laser-triggered water switch experiments

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4 Author(s)
Woodworth, J.R. ; Sandia Nat. Labs., Albuquerque, NM, USA ; Chalenski, D. ; Sarkisov, G.S. ; Blickem, J.R.

We report the results of experiments using a small Q-switched Nd:YAG laser at 532 and 1064 nm to trigger a 170-kV pulse-charged water switch. 1-σ jitters as low as ±1.7 ns were demonstrated; an order of magnitude improvement over the ±25-ns jitter of the switch in its self-breaking mode. At the optimum observed triggering wavelength of 532 nm, a 7-ns laser pulse gave better results than a 0.15-ns laser pulse. Time resolved optical diagnostics suggest a multistage triggering process in which the laser forms a string of point plasmas between the switch electrodes. These point plasmas expand, cool and merge, forming a vapor column between the electrodes that breaks down rapidly with low jitter.

Published in:

Plasma Science, IEEE Transactions on  (Volume:33 ,  Issue: 6 )

Date of Publication:

Dec. 2005

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