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Re: 1000 foot sparks?
For those interested in long sparks:
Check out "Gas Discharge Physics" by Yuri P. Raizer (Springer-Verlag 1991)
On page 159 experiments with optical breakdown in air using a Neodymium
laser are discussed. Apparently a 60meter (196 feet) visible discharge
channel was obtained with a laser pulse of 160 joules with peak power of
5GWatt....
it would have been interesting if they could have followed this initial ionized
path with discharges from a large tesla coil. I wonder how long the
discharge channel would have been stable...