RE: MMC Survivability, Thanks for the input

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi Terry, et al

Since I have well over (100) 942c20p15k on hand. I think what the collective
wisdom seems to be is to increase the strings to 18 caps and use 12 rows.
I'll have to order more from Richardson's. I would rather not go the 940
route since I have many 942's. Does this seem more in the green range?

Thanks,
Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, August 29, 2006 8:22 PM
To: tesla@xxxxxxxxxx
Subject: Re: MMC Survivability

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Yes, your right Terry! The 940C20P47K-F are right there for the task
at hand. The 0.15uF are so common to coilers, that maybe we bypass
what is right there available under our noses. Thanks for sharing
that. That expands my coiling universe a little bit.

Take care,
Bart

Vardan wrote:

>Hi,
>
>Although a lower voltage thing, the SISG pushes RMS currents to the
>35 Arms region!!  At that point, fully metalized MMCs become the
>dominate choice.  Far higher capacitance but lower peak currents
>while still having considerable RMS current...  The CD 940C20P47K-F
>at 451 amps peak at 13Arms is a choice.  One needs to consider the caps at:
>
>http://cde.com/catalogs/940C.pdf
>
>Easily available from rell.com or mouser.com...  If you can handle
>the "tech", ScanTesla easily resolves the current details:
>
>http://drsstc.com/~scantesla/scantesla800(beta).zip
>
>Cheers,
>
>         Terry
>
>At 07:19 PM 8/29/2006, you wrote:
>
>>Hi Gerry,
>>
>>Yes, it might be ok. But it is still riding the edge. Running the
>>spice model would be ideal for the situation as this will at least
>>give a model to go by (sure beats trial and error). When it comes
>>to pigs in common STR mode, Cp is a good thing to spice up if one
>>is thinking of using MMC's. The voltage capability of an MMC string
>>becomes important as we near resonance, so the further we are away
>>the better (in either direction). What is nice about high kva
>>transformers is STR is still significant energy which helps the MMC
>>compete with professional pulse caps in that range from a cost
>>standpoint. However, to get a seriously robust MMC from a voltage
>>standoff rating, pulse caps are a less expensive upfront cost
>>(replacement cost is always on the side MMC's). I think for pig
>>MMC's, we still need a larger value MMC cap to get the cost down.
>>The 0.15uF's are just too low (I would really like to see a 0.5uF
>>MMC available). 5kva is still in range of MMC's, so Jim just needs
>>to decide what he is comfortable with.
>>
>>Take care,
>>Bart
>
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