Preliminary report on the Higinbotham scaler

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Material Information

Title:
Preliminary report on the Higinbotham scaler
Series Title:
United States. Atomic Energy Commission. MDDC ;
Physical Description:
5 p. : ill. ; 27 cm.
Language:
English
Creator:
Wakefield, Ernest
Argonne National Laboratory
U.S. Atomic Energy Commission
Publisher:
Atomic Energy Commission
Place of Publication:
Oak Ridge, Tenn
Publication Date:

Subjects

Subjects / Keywords:
Counting circuits   ( lcsh )
Pulse techniques (Electronics)   ( lcsh )
Electronic circuits -- Charts, diagrams, etc   ( lcsh )
Genre:
federal government publication   ( marcgt )
technical report   ( marcgt )
non-fiction   ( marcgt )

Notes

Restriction:
Date Declassified: March 9, 1947
Statement of Responsibility:
Ernest Wakefield.
General Note:
Manhattan District Declassified Code
General Note:
Date of Manuscript: April 26, 1944

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005024665
oclc - 465256572
System ID:
AA00009339:00001


This item is only available as the following downloads:


Full Text
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MDDC 832

UNITED STATES ATOMIC ENERGY COMMISSION


PRELIMINARY REPORT
ON THE HIGINBOTHAM SCALER

by
Ernest Wakefield


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Date of Manuscript:
Date Declassified:


April 26, 1944
March 9, 1947


Issuance of this document does not constitute
authority for declassification of classified
copies of the same or similar content and title
and by the same author.

Technical Information Branch, Oak Ridge, Tennessee
AEC, Oak Ridge, Tenn., 5-20-49--850-A4931
Printed in U.S.A.
PRICE 5 CENTS


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PRELIMINARY REPORT ON THE HIGINBOTHAM SCALER


By Ernest Wakefield


SUMMARY

Because of the interest in the Higinbotham scaler, its operation is described and some test data is
presented together with the circuit diagram. A typical parts list is included. This circuit, particularly
the input, is subject to change as experience is gained.

Tests indicate that the circuit parameters of a Higmbotham circuit are wide. This conclusion is
based on tests of two scalers made by Wendell Bradley's group and tested largely through the effort,
of Stanley Cooper. Further work is envisaged and will bte reported on in due course.

John Simpson reports that a Higinbotham has been driven at 800 K.C. He achieved this with a spe-
cial input circuit and a regular pulse. In the early stages he was also careful about stray capacitances.
An oscilloscope was used as a recorder.


CIRCUIT OPERATION

Description of Scaling Action in the Higinbotham Circuit

The reset button being pressed places a positive potential on the right hand grid of each 6SN7 (as
shown in the diagram). This causes all the right hand triodes to conduct, hence lowering their plate
potentials. This cuts off the left triode and also depresses the potential on the left plate of the preced-
ing connecting diode. The scaler is now ready to receive pulses.
A negative pulse being applied to the input trigger pair causes the first plate to go positive. This
pulse is transferred to the grid of the second tube of the trigger pair causing this latter plate to go neg-
ative. As the left plate of the diode is at a lower potential than the right, the latter conducts with this
negative pulse. This drops the potential of the diode plate and a negative pulse is transmitted to the
grid of the triode which has been conducting current. This action decreases the current flow through
this tube causing its plate to become more positive, which transmits a positive pulse to the grid of the
paired triode. The plate of this triode drops in potential, which lowers the plate potential of the pre-
ceding diode, which has just conducted. This action also lowers the grid potential of the triode pair
which had just decreased its passage of current further cutting off this tube. It can be seen that a
positive pulse is transmitted to the next diode stage, but has no effect since it decreases the plate-
cathode potential which is already too low for the diode to conduct.

The next negative pulse out of the input circuit causes the left diode to fire. because its plate poten-
tial is higher than the adjoining one. This transmits a negative pulse to the grid of the left triode which
is carrying current. decreasing this flow. The plate, rising in potential, puts a positive pulse on the grid
of the adjacent triode which conducts. The plate, dropping in potential as a result, places a negative
pulse on the cathode of the following diode. Hence, for two negative pulses applied to the scaling stage
only one has gone on.


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MDDC 832


The appliance of two negative pulses to the last stage causes a positive pulse to be emitted. This
places a firing voltage across the neon coupling lamp, which now passes current. This increases the
potential across R66 which makes the grid of the output tube, a 6V6, more positive. This tube becomes
conducting and draws current through the recorder. To decrease the reluctance of the magnetic circuit
(in the Wizard recorder) iron arms rotate operating a pawl and gear registering a count. To reduce the
back voltage and hasten operation of the recorder a 200,000 ohm resistor in parallel with a .06 mid,
600 volt condenser is placed in parallel with the recorder.

The low voltage supply is conventional.

Operation of the Regulated High Voltage Supply

One end of the secondary of the high voltage transformer is grounded and the other is connected
to the plate of a 2x2 half-wave rectifier tube. The cathode of this, which is at a potential of about 1600
volts, is connected to the plate of an 809 triode, which is also connected to a 2 mid filter condenser to
ground. The 809 acts as a variable resistance in the high voltage circuit and is controlled by the 6SJ7
in the manner given in the next paragraph.

Suppose the high voltage at the cathode of the 809 becomes too high. More current then passes
through the bleeder resistances R67, R68, R69 and R70 to ground. From potentiometer R68 the control
grid of the 6SJ7 becomes more positive with respect to the cathode permitting more current to pass
through this tube. This lowers the potential on the plate of the 6SJ7. which in turn lowers the grid poten-
tial on the 809. As this effectively increases the resistance of the 809, less current is supplied to the
high voltage supply and hence the voltage decreases. A decrease in voltage gives the opposite effect.

809 RF POWER AMPLIFIER 2X2/879 HALF WAVE
p HIGH VACUUM RECTIFIER
GRID 3 2 NC NC 2 3NC




H40 1H H1 4HaK
TOP VIEW


6SN7 TWIN TRIODE AMPLIFIER 6H 6 TWiN DIODE
GT1 4 5 PT1 KT2 5 PT1
KT2 3 6 KT1 PT23 6

P T2 7 H 2 7 H

G2 1 8 H SHELL 1 8 KT


6SJ7 TRIPLE-GRID
6V6 EAM POWER AMPLIFIER DETECTOR AMPLIFIER

G2 4 511 G4 5<

P 3 6 G63 3 6 G2

H 2 7H H 2 7H

SHELL 1 8 K SHELL 1 8 P


Figure 2. Several of the tubes in the Higinbotham scaler.













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PARTS LIST


V14
V15
V16
V17
V18
L1
L2
L3
Rl

R2
R3
R4
R5
R5A
R6
R7
RB
R9
RI0

Rll
RI2
R13
R14

R15


2x2/879
809
6S17
5Y3GT
6V6
Stop Count Indicator Lamp, 6v
Power Supply Indicator Lamp, 6v
High Voltage Supply Indicator Lamp, 6v
I megohm, 2 watts
1 megohm, 2 watts
2 megohms, 0.5 watt
0.1 megohm, I watt
24,000 ohms, 1 watt
5,000 ohms, 1 watt
3,300 ohms, 1 watt
5,000 ohms, 4 watts wire-wound potentiometer
1,000 ohms, I watt
15,000 ohms, 10 watts
0.1 megohm, 1 watt
1 megohm, 0.5 watt
0.2 megohm, 1 watt
0.1 megohm, I watt
20,000 ohms, 2 watts
5,000 ohms, 1 watt


R16
R17
R18
R19
R65

R66
R71
R72
R74
R 75

R76
R77
R78
C1
C2

C3
C4

C5
C6
C7
C25
C26
C27


This is not a complete list of the resistors and capacitors used in this unit. However, the values here
given for the first scaling stage are typical of all six scaling stages.


END OF DOCUMENT


15,000 ohms, 2 watts
10,000 ohms, 3 watts
0.2 megohm, I watt
0.1 megohm, 1 watt
1 megohm, 0.5 watt
0.5 megohm, 0.5 watt
5 megohms, 2 watts
50,000 ohms
30,000 ohms
200,000 ohms, 2 watts
5,000 ohms, 20 watts
5,000 ohms, 20 watts
2,000 ohms, 10 watts

75 glif, 5,000 volts
.05 4f,.2,000 volts
50 pipif
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0.01 pf
50 MMf
.06 Af, 600 volts DC
20 Af, 450 volts DC
20 ;f, 450 volts DC




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