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Multi-layered Secondary
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From: Alfred C. Erpel (Home) [SMTP:aerpel-at-pil-dot-net]
Sent: Tuesday, March 24, 1998 6:14 PM
To: Tesla List
Subject: RE: Multi-layered Secondary
> From: Jim Lux [SMTP:jimlux-at-earthlink-dot-net]
> Sent: Monday, March 23, 1998 10:32 AM
> To: Tesla List
> Subject: Re: Multi-layered Secondary
> The "resonance transformer" 1+ MeV x-ray sources developed at GE by
> Charlton in the 30's used just such a coil. A series of 125 air core
> pancake windings were connected in series and resonanted at 180 Hz. The
180
> Hz was generated by a clever saturating transformer running from the 3
> phase 60 Hz supply. The spacing of the pancakes was not uniform, by the
> way. The total L was calculated at around 15,000 H and the C was 50 pF.
The
> system developed 55 mA peak secondary current at 1000 kVp (i.e. 55 kW).
The
> losses in the system ranged from around 1 kW at 1 MV output to about 4 kW
> at 2 MV (i.e. as the square of the voltage/current). The load current was
3
> mA.
I've wondered about winding a huge coil (stacked series pancakes) which is
resonant at 60 Hz. No more spark gap.
This would be truly dangerous, 1 zap and you probably wouldn't get a
second chance.
> The system was in a steel tank with Freon 12 at 60 psig for insulation.
The
> entire system (a portable Xray generator) was 3 ft in diameter, 4 ft high
> and weighed about 1500 lb. A 20 cfm blower circulated the gas when running
> at 1.25 MV.
> This data was taken from Craggs & Meek, "HV Laboratory Technique"
Funny what was once considered portable (1500 lbs.) I know of a portable
x-ray unit that weighs 35 lbs. including the suitcase it is carried in. The
x-ray head itself, with handle, removes from the suitcase, while the power
remains in the suitcase attached to the head via cable. Head weighs about 14
lbs.
Regards,
Alfred Erpel