alternative static spark gaps

Now that I have eliminated commercial flash tubes from my TC timemiser
list, what about making your own pressurized spark gap.  I will bet that
there are better gases than air for spark gaps, perhaps something with a
low ionization potential.  And what about using lower pressure or higher
pressure. Or even a auto spark gap adjust by changing the pressure, and
therefore breakdown voltage so you don't have to fiddle with the gaps.
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