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BIG Capacitors
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Wednesday, February 18, 1998 3:51 PM
To: Tesla List
Subject: Re: BIG Capacitors
Perhaps I can help:
> From: Bill Lemieux [SMTP:gomez-at-netherworld-dot-com]
> Sent: Tuesday, February 17, 1998 5:02 PM
> To: Tesla List
> Subject: Re: BIG Capacitors
>
> Justin Oliver wrote:
>
> > Does anyone know where I could obtain several capacitors (surplus or new)
> > rated at over 100uF and at a voltage of 18Kv or over. These caps will go to
> > use as part of a circuit in a coil crush experiment.
>
> You are looking for a 16 _kiloJoule_ capacitor, which is a non-trivial
> thing. Given the nature of your experiment, you are also looking for
> caps specifically designed for pulse-discharge, ie, low-self-inductance,
> low ESR, and a certain amount of voltage-reversal capability.
>
> The only people I know of who make such beasts are Maxwell Laboratories.
> http://www.maxwell-dot-com
>
> However, depending on the size and mass of your experiment, you may
> not need that much energy storage- are you certain of your
> requirements? How many of these caps do you need?
>
> I have a few exotic ultra-low-inductance pulse-discharge caps, but they
> aren't in that energy storage regime.
>
> -Gomez
The caps are used in a non-repetitive situation so the only real
qualities they must have are being able to consistently withstand the
applied DC voltage with a safe margin and low ESR (extended foil is
mandatory). A design for a dry-fired rolled cap that fits this
description is available on Jim Fosse's Website and also I think on
the nic.funet site. These caps are relatively cheap to build and you
can scale the design without degrading it or build a number of them
an parallel them up. Yes, it's my design.
Malcolm
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