Re: [TCML] first light disaster

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Ed Phillips wrote:
> Yes, BUT..............  I've lost the original note but if I recall 
> correctly Marko is using a 12 kV, 30 ma transformer which would have a 
> leakage reactance of the order of  400 k.  The reactance of the 0.188 
> ufd capacitor would be only about 14 k so can't see much of a resonant 
> rise.
>
> Ed
There is certainly no resonant rise. But the transformer will still 
attempt to charge the cap to 17kVp as controlled by the gap (and were 
talking about first light for the whole system, so there are unknowns 
everywhere). The charge time is long, but he is only at 60bps if I 
understand the gap correctly. If the gap didn't fire until somewhere 
near the NST output, he would have overcharged each cap in the string to 
over 2100 volts. The tap disconnect may have aggravated the situation. 
These are snubbers, so I doubt they have ability to withstand too much 
voltage stress.

One thing is certain, the mmc is not configured correctly. If it would 
have been configured in a single string of 24 caps, there would have 
likely been no problem even with the tap disconnected. The NST could 
then only throw 710V to each cap (which would be perfect as each cap is 
rated for 1500V).

Bart

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