Re: doublers for 500kV (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 23 Sep 2004 01:19:38 -0400
From: Colin Quinney <crquin@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: doublers for 500kV (fwd)

Thanks everybody for your suggestions.

I just got up off my derier and went to the garage to have a look to see if 
it's center tapped. Forgot to take my meter but I noticed the voltage read 
130 kV not 250 kV. Oops. Looks like I'll need to build a quadrupler. I have 
about 70  20 kV diodes. Problem will be building the caps. I plan on using 
mylar 6 mm.Mylar is good for 17kV per mm. That's probably not thick enough 
so maybe two layers of 4 mm or something similar. I'm hoping that one 
square foot area with 8 mm of Mylar will do the trick with 60 Hz. Does that 
sound about right? I can go to 5 square feet per cap or even higher square 
footage, that is if I roll them and immerse them in the same dielectric 
oil, but I need to know the square footage.

All advice is useful. Thanks :-)

Colin



  9/22/2004, you wrote:
>Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Wed, 22 Sep 2004 09:49:18 -0700
>From: Jim Lux <jimlux@xxxxxxxxxxxxx>
>To: hvlist@xxxxxxxxxx
>Subject: doublers for 500kV
>
>Since most Xray transformers have a grounded centertap (like a neon
>transformer), your HV output is going to be floating.  In that case, rather
>than the half wave doubler that Bert suggested, maybe a full wave doubler
>might be more appropriate.  Same number of diodes and capacitors, but the
>caps are in series on the output.
>
>
>Feeble attempt at ascii art here...
>
>-------- diode1>>> --------------   + output
>    |                    |
>    |                    |
>    |                  -----
>    |--                -----
>-----|-----------------|
>    |--                  |
>    |                  -----
>    |                  -----
>    |                    |
>    |                    |
>    |                    |
>    ----- <<<diode2---------------   - output