Re: [TCML] quench times again

[FutureT@xxxxxxx]

In a message dated 11/22/2007 5:54:27 P.M. US Eastern Standard Time,  
list@xxxxxxxxxxxxxxxxxxxxxxxxx writes:

>John,

>Very interesting analogy!

>Wouldn't this  support the idea though of instead of one big bang (say 10KV) 
>that it  would be better use lots of small bangs (maybe 2KV)...


Chris,
 
As far as I know, all the work that's been done so far suggests  that
using higher breakrates gives brighter streamers, which may have a  lower
impedance, but they also tend to be shorter streamers for a given  input 
power.
I'm not really sure if the sparks appear brighter because they're  actually
brighter, or because they repeat faster and fool the eye into thinking  they
are brighter. 
Also, a higher breakrate may give the gap less time to cool  between
bangs and hurt the quench that way.  I don't really know if  high
breakrate coils tend to quench better.  But in any case they  don't
seem to give longer streamers for a given input power.  


>idea then, that the corona build up is slower, pumping a  little bit a at a 
>time into the same path..... I guess this could  support a faster BPS idea 
>but at a lower throughput  level...

>So it is streamer impedance which needs to be lower....  Would there be any 
>sort of figures which can be put to this ?
 
Terry suggests that typical streamers are about 220 k ohms (?),  with
about 1pf of capacitance per foot, I think.  I think some DRSSTC  researchers
found a different value.  I think tube coils give a much lower  streamer
impedance, but the streamers also tend to be much shorter for a given  input 
power.
 
It takes more power to produce a thick bright streamer, compared to a  dim
streamer.  
 
John

>Cheers,
>Chris








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