[TCML] High Power Static Gaps
bartb at classictesla.com
Sun Sep 7 13:31:18 MDT 2008
I've had those same thoughts from time to time. I think the main goals
are to quench fast enough to help reduce power dissipation at the gap
and to have enough thermal dissipation at the gap to stabilize the
temperature for the power level. Pressure would alter the breakdown
voltage, but in so doing, allows for slight variation of gap widths
which may aid for heat dissipation and evacuation.
There is tungsten plate around. Just do an internet search. McMaster
doesn't carry it, but other tungsten sources do.
I did try a tungsten static gap at one time. I used rod stock in a TCBOR
design. Spacing between electrodes was large overall due to using a 40kV
Trigger Gap. Performance was not good. I contributed three main causes:
1)solid body tungsten rod. 2)the trigger circuit itself. 3)I did not
spend enough time fiddling with it.
Sfxneon at aol.com wrote:
> Thanks Jim, that gets me to wondering, if at some point, pressure might work
> better than vacuum?
> Are there any more considerations than just overheating of the electrodes? I
> know that proper quenching is the real goal and keeping the electrode
> temperature as low as possible is essential for that, but could a single static gap
> quench at multi-kilowatt power levels if kept cool enough?
> Which brings to mind this question: Is there anything like a tungsten flat
> washer available anywhere? If so, how about brazing one on to the face of each
> copper cap electrode?
> Tony Greer
> Sfxneon at aol.com wrote:
>> Hi All,
>> I'm curious about the spark lengths achieved by others using a single
>> vacuum aspirated gap, (I believe the one designed by Gary Lau if memory
>> serves)? It uses a vacuum cleaner motor, PVC pipe and two large copper
> tubing end
>> caps with holes in the middle for the electrodes.
>> What are the limiting factors with this type of gap? Can it be scaled up
>> higher power? It's a beautifully simple and elegant design, without the
>> for any close tolerance machine work like with rotaries, and it's much
> In a message dated 9/7/2008 12:04:58 P.M. Central Daylight Time,
> jimlux at earthlink.net writes:
> The literature has references to gaps of this type (generally, not with
> the specific construction you describe) running at multiple kilowatt
> power levels. The Marx blast gap is a good example. It actually used
> air blowing out through the center hole in the electrode.
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