[TCML] capacitors

[Tom Trevethan]

Hi,

As I understand it, you can choose over a large range of values for the tank
capacitor for a DC design, and the power is controlled through the firing rate
of the rotatry spark gap. The upper limit of the cap value is 
determined by the
resonant frequency of the tank capacitor / charging inductor circuit, 
which must
be more than half the rotary gap firing rate.
Out of interest, what value of charging inductor do you have, and what firing
rate do you plan?

Also (please others correct me if I'm wrong) but with a DC coil the 
tank cap can
be chosen with smaller tolerances, because it will never see more than double
the DC voltage (no resonant rise).

Tom

Quoting Tomas Stankevic <Tomas.Stankevic at ff.vu.lt>:

> I'm going to run a 25kW 10kV 3phase pig . I calculated that I need=20
> 250nF, voltage will be more than 20 kV (because of 6pulse mode and=20
> resonant charging), so I think 30 kV is the minimum.
> What do you mean custom-made cap?
>
> Actually I have lots of capacitors,
>
> Mddeming at aol.com wrote:
>> =20
>> In a message dated 12/3/07 1:13:36 P.M. Eastern Standard Time, =20
>> Tomas.Stankevic at ff.vu.lt writes:
>>
>> ,
>> what capacitors would you recommend me to build a 250nF @ 40kV  MMC? (f=
> or=20
>> DC TC powered by 3phase pig) how much (approximately) it will  cost? Wh=
> at=20
>> about shipping to  Lithuania?
>>
>> Toma=C5=A1
>>
>>
>>
>> Hi Toma=C5=A1,
>> =20
>>     The cost would depend not just on the voltage, but  also how much p=
> ower=20
>> you will be putting through, as power determines the  peak current your=
> caps=20
>> will have to handle. Since the CD caps run ~$3.30 each,  and you may ne=
> ed=20
>> several hundreds of them, a custom-made cap might be cheaper  than an M=
> MC. I believe=20
>> Dr R. may be the best source for truly large caps.=20
>> =20
>> =20
>> Matt D.
>>
>>
>>
>>
>> **************************************Check out AOL's list of 2007's ho=
> ttest=20
>> products.
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>>
>>  =20
>
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-- 
Dr Thomas Trevethan
London Centre for Nanotechnology
and Department of Physics and Astronomy
University College London
e-mail: t.trevethan at ucl.ac.uk
Tel: 07952934327