Re: MMC voltage ratings

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Michael Rhodes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rhodes-at-fnrf.science.cmu.ac.th>

These are the values from QuickTC

11/21/2001    9:12:14 AM
HST Voltage Rating  15000
Transformer Current Rating  120 mA
Firing Voltage  21213.15
Desired capacitance value 30 nF

Strings Caps/String Capacitance Voltage     Temp C     V Rating     T Rating
Life
1                 5               30.0              10,000     34.45
Very Poor Very Poor   2283.66 hours
2                10              30.0              20,000     8.61
Marginal    Good           2969.48 weeks
3                15              30.0              30,000     3.83
Good         Excellent 1  300317.0 weeks
4                20              30.0              40,000     2.15
Good         Excellent     97303950.0 weeks

At Resonant
-----------------

11/21/2001    9:13:35 AM
HST Voltage Rating  15000
Transformer Current Rating  120 mA
Firing Voltage  21213.15
Desired capacitance value 25.4648 nF

Strings Caps/String Capacitance Voltage Temp C V Rating     T Rating Life
1                 6                  25.0         12,000 23.92     Very Poor
Very Poor 1.4 weeks
2                12                 25.0         24,000 5.98       Good
Good 45750.85 weeks
3                17                 26.47       34,000 2.98       Good
Excellent 8499910.0 weeks
3                18                 25.0         36,000 2.66       Good
Excellent 20034020.0 weeks

--Michael

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, November 21, 2001 1:08 AM
Subject: MMC voltage ratings


> Original poster: "Jonathan Peakall by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>
>
> Hi All,
>
> I am making my MMC, and am a little unsure of whether I have an adequate
> voltage rating. The Geek site says this is ok, and the Java MMC calculator
> says the reliability is bad. I must be doing something wrong, as it says
all
> my designs are bad, even when I put silly numbers of caps in a string.
Could
> y'all weigh in on this one? I want to make a good one that lasts. My
specs:
>
> PSU: 15/120, static gap, desired tank cap around .03uf (LTR)
>
> I have 22 caps, .15uf/2000VDC. The Geek site says 2 strings of 10 will be
> ok, this would be .03uf/20kv. Does this have an adequate safety margin?
>
> I could go closer to resonant and get 8 more
> caps, and have 2 strings of 15 for .02uf/30kv. Is .02 close enough to
.0212
> (the value listed as resonant) to be resonant?
>
> Once again, as always, thanks much.
>
> Jonathan Peakall
>
>
>
>
>
>