CHALK RIVER

To: tesla-at-poodle.pupman-dot-com
Subject: CHALK RIVER
From: Tesla List <tesla-at-stic-dot-net>
Date: Tue, 01 Apr 1997 19:18:12 -0600
Approved: tesla-at-stic-dot-net
Subject: 
        CHALK RIVER
  Date: 
        Tue, 01 Apr 1997 12:10:00 -0500 (EST)
  From: 
        Benson_Barry%PAX5-at-mr.nawcad.navy.mil
    To: 
        tesla-at-pupman-dot-com


Hi Dr Resonance, All,
Do you know anything about this experiment:

     "A TESLA TRANSFORMER HIGH-VOLTAGE
                    GENERATOR
          BY C. R. J. HOFFMANN
     (ATOMIC ENERGY OF CANADA LIMITED,
                  CHALK RIVER, ONTARIO, CANADA)

     REVIEW OF SCIENTIFIC INSTRUMENTS,
                 VOLUME 46, # 1, JANUARY 1975

A Tesla transformer similar to that suggested for
transformer-type pulsed accelerators is described.
The theory is outlined and computational results
presented for representative losses under various
conditions of tuning and coupling.  The behaviour
of an experimental transformer housed in an SF6
 -filled pressure vessel is discussed.  The device
has a tuning ratio of 1.1, a voltage coefficient of
0.85, and a coupling coefficient of 0.37.  The
influence of eddy currents induced in the
pressure vessel wall on the coupling coefficient
and tuning ratio is noted.  The particular transformer
described can provide a 2.5 MV peak at hte third
half cycle of the secondary output voltage.

(specs.: secondary diameter: 28.8 cm
               secondary length: 68 cm
               secondary turns: 1130 of # 30 magnet wire
               secondary turn separation: 0.03 cm (epoxy)
               secondary self inductance: 0.13H
               secondary winding resistance: 350 ohms (dc?)
               secondary self capacitance: 36 pF (with terminal)
               insulation: 4 atmospheres of SF6

               "The primary is mounted on a truncated
                 conical lucite former, concentric with the
                 secondary.  Four turns of aluminum, 0.32
                 cm thick and 11.4 cm wide, are spaced 2.5
                 cm  apart.  The turns diameter varies from
                 43.6 cm at the bottom of the smallest turn
                 to 71.6 cm at the top of the largest.  The
                 leads to and from the winding are arranged
                 to be on top of the interturn connecting
                 pieces, thereby making the inductance of
                 the leads negligible.  The winding self
                 inductance is 6.7 uH.

                 The primary capacity connects to the
                  transformer through a switch via low
                  impedance (~7 ohm) parallel-plate
                  transmission line.  The switch consists
                  of two ignitrons connected in an
                  antiparallel configuration and fitted
                  with low inductance connections to
                  the transmission line.  The series
                  resistance in the primary circuit
                  (switch closed) is~ 0.15 ohms most
                  of which is in the ignitrons.  The primary
                  capacitor is 0.68 uF and has low inductance.

                  (primary capacitor is charged to 13 kV.)

The author acknowledges useful discussions with J. A.
Hulbert and the technical assistance of Mr. R. Cox in
assembling and operating the experiment."

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Barry