Maxwell caps was (Re: Re:Re: New Capacitor (fwd))

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

Original poster: "Jim Lux" <jimlux-at-jpl.nasa.gov> 

Referring to the Maxwell catalog...

Pulse Discharge Capacitors (as differing from Energy Storage Caps, listed
below)
Plastic case variety (part numbers like 31159,.31235, etc/)  These have
terminals on one  end of a long plastic case that looks like a loaf of
bread. (The picture in the catalog is wrong... it is the case for the 313xx
etc) The cases are 2.3x5.9 inches, and vary in length.  Typical would be
the 21260 at .22 uF, 50kV, 1 pps max -at- <20%VR, 25 kA peak, 25 A RMS, 1E5
shots

Double ended plastic case (parts31393.31593.31981) 3/8"-16 female terminal
at each end of long thin plastic case 4x6xNN inches. 31981 is .1 uF -at- 40
kV, 100 pps, 25 kA, 25 A, 1e8 shots, 10.5" long

Double ended plastic case (parts 37600,376xx) 2.3x5.9" cross section, 10-32
UNF terminal at each end, Typical values (37633) .01 uF, 50 kV, 1000 pps, 
25 kA, 25 A, 1e8 shots (but no 20% reversal!), 4" long

Then we have the "Single ended plastic case" units (lots of these around in
TC's)
Two basic package sizes: 4x6 inch cross section and 2.3x5.9 inch in various
lengths.
all rated at 20% VR
All the 31xxx parts are 1pps units, tyoically 25 kA, 25 RMS A, design life
3E4 to 1e5 shots, -10 to +40C
All the 37xxx parts are 1000pps, 50 kA, 25-50 A RMS, 1e8 shots, -30 to
+65C, and are in the newer smaller cross section

For comparison of relative sizes:(both are .15 uF -at- 50 kV)
31159 2.3x5.9x9.8 
37331 2.3x5.9x27.5 (three times longer!)

The Series C energy storage caps (big metal cans, tens of kilos, lots o'
joules)

part numbers are 32xxx, and 33xxx
Typical: 33464  30 uF 20 kV VR 80% VR(higher than most), 50 kA pk, 1E5
shots, 45 nH, 8.48x14x24.1" 165 lb ($2500 each, btw)
32349 206 uF, 22 kV, 10% VR, 50 kJ, 150 kA, 3000 shots, 45 nH, 12xx16x27.4"
320 lb

you get the idea...

Then, Mini Double Ended (as used in defibrillators, e.g.).. extended foil
with low loss dielectric, rep rates to 1000 pps for the 1E9 shot units

all 376xx part numbers
2.3x5.9 cases 3,4, or 5" long, 10-32 screws on the ends, two flavors, 1E8
shot and 1E9 shot

Typical 1E8 shot: 37620, 75 nF, 30 kV, 5" long
typical 1E9 shot: 37621, 35 nF, 30 kV, 5" long
----------
> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: Re:Re: New Capacitor (fwd)
> Date: Wednesday, December 06, 2000 8:37 PM
> 
> Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 6 Dec 2000 23:08:30 EST
> From: Tesla729-at-cs-dot-com
> To: tesla-at-pupman-dot-com
> Cc: Tesla729-at-cs-dot-com
> Subject: Re:Re: New Capacitor
> 
> Hi Bert, Jim Lux,
> 
> I haven't been able to determine the part # of the .22 uFD, 50 kV
> Maxwell capacitor yet, but I do remember it being described as a
> "High Energy Density" capacitor and was removed from a Marx 
> generator, so it's probably a mylar dielectric, designed for low PPS
duty:-(  
> One thing that I have noticed about my High Energy multiple pulse cap 
> that I am using in my 10 kVA coil is that it isn't very physically large
for
> its voltage/capacitance rating either. It is (12) identiacal .0275
> uFD -at- 42 kVDC pulse caps built into single 3" X 5" X 25" long
> plastic block unit that weighs only about 12 lbs. I have externally
> bussed them for 2 strings of 6 for a single .083 uFD -at- 84 kVDC
> unit and its external surface rarely gets noticably warmer than
> ambient temperature, even after extended high powered runs :-)
> 
> Keeping 'em Sparking in Memphis,
> David Rieben
> 
>