Vacuum jar rotary spark gap / thyratron (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 12:15:16 -0700 (PDT)
From: Timka <tomasdoc2002@xxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Vacuum jar rotary spark gap / thyratron

  
Anyone tried before to make a vacuum jar rotary spark gap?
   
  I have a nice deep vacuum pump and I’m thinking to make a rotary spark gap using 10,000 rpm hard drive motor with attached tungsten electrodes. Everything will be assembled and placed under a thick and large plastic jar from which I would pump all the air away.
   
  Since that motor is DC I can change RPM with voltage and it also has a nice Hall sensor build in, which I can use to monitor RPM with external meter.
   
  I'm doing it because I'm tired of spark gap noise, so I think that if I create above mentioned enclosure it would help to ease stress to my ears.
   
  Any suggestions and constructive criticism would be extremely appreciated.
   
  Also,
   
  As a part of tube exercise I also decided to give it a try with thyratrons instead of spark gap. It seems that thyratron tubes are relatively easy to set up as spark gaps using proper drivers. I have a nice thyratron driver (NanoFast 204-7 Trigger 3.5KV). Does anyone know if there any limitations on tubes to be used?
   
  Again, suggestions and constructive criticism would be extremely appreciated.
   
  Many thanks,
   
   
  Tim
   
   
   
   


Tesla list <tesla@xxxxxxxxxx> wrote:  
---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 17:00:06 +0100
From: Chris Swinson 

To: Tesla list 
Subject: safe capacitor discharge times ?

Hi all,

Was thinking today, Electrolytic capacitor and current ratings. Of course if 
you wack a screw driver across it, will discharge faster than capacitor 
rating (10amps is about as good as I have seen, maybe 1amp for smaller 
values), capacitor will be damaged in anycase trying to give a large high 
peak amp pulse, could heat up or even explode...

so onto my question, if I have a pulse of 100amps, but the rise time is only 
1amp per uS, instead of a 100amp rated capacitor, could a 1amp one be used 
instead ? It would in effect draw 1amp for 100uS for example but has passed 
100amps in total.

Cheers,
Chris







       
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