Dual-count transfer system for dekatron

Dual-count transfer system for dekatron

NUCLEAR INSTRUMENTS AND METHODS 15 (1962) I17--118; N O R T H - H O L L A N D PUBLISHING CO. DUAL-COUNT TRANSFER SYSTEM FOR DEKATRON K. S. K U...

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NUCLEAR

INSTRUMENTS

AND

METHODS

15 (1962)

I17--118; N O R T H - H O L L A N D

PUBLISHING

CO.

DUAL-COUNT TRANSFER SYSTEM FOR DEKATRON K. S. K U C H E L A

Atomic Energy Establishment Trombay, India Received 2 J a n u a r y 1962

Dual-count transfer from the plates of a flip-flop is frequently employed for improving the reliability and counting capability of a ring counter. Kt

II: I1

G2A G2s O2c

Kz

G3A G3s G3c K3

tive transfer electrode between k and k + 1. When the drive pulses end, the glow is transferred to the next cathode, k + 1 in preference to k be-

Ko

400 V 200 k

K1 G2 K2

27 pF

B A EVEN CATHODES

K2- Kt$

S

lOOK~ 10~21pF OUTPUT CATHODE EVEN KZO

ODD EVEN TRANSFER TRANSFER ELECTRODES ELECTRODES G1 -- G19 Gz - G20

1DOk '~F] ~ 5 0 p F

50pF~

30v

lOOk.

SET Fig. 2.

Fig. 1.

tI This type of drive can be used for certain types of Dekatrons currently available. The forty electrode Dekatron, Erricsson type GC 10D, though generally used as a single pulse counting tube, can be adapted for the purpose. One set of twenty alternate electrodes are used as cathodes and the other, as the guide or transfer electrodes. When associated with the flip-flop drive, twenty stable states are obtained. The nomenclature of electrodes is shown in fig. 1. The complete circuit is shown in fig. 2 and the wave-forms associated with it are pictured in fig. 3. The transfer of glow is effected in a sequential way. 'The drive gives pulses of opposite polarity to the transfer electrodes on either side of any cathode. When the drive is present, the glow in the conducting cathode, say k , is transferred to the nega117

,

I

/

I I

INPUT

I

I I ll~

~

I

I

I

I

II

I I I~

EVEN TRANSFER ELECTRODES (B)

/

ANODE

I I

,

II

P

(A)

I

/ I I

I I

I I

! 'I

I

: 'I

I

ODD

TRANSFER ELECTRODES

I

(c)

EVEN CATHODE5 (E)

ODD CATHODES

,'

It

Fig. 3.

(D)

118

K.S. KUCHELA

cause of the positive bias retained in the cathode circuit of k . Without affecting the operation or pe~ormance, it is possible to isolate one cathode and connect to a separate biasing circuit. This cathode will serve as the output point for the counter. The glow can be transferred in either clockwise or anti-clockwise direction by suitably setting the

state of the flip-flop when the Dekatron is reset to zero. With the component values shown, counting rates above 40 kc/s have been realised. The author would like to thank Shri A. S. Rao and Shri G. H. Vaze for their interest in this work.