Fundamental Technologies

Voyager LECP Pages

January 24, 1979

TO: Steve Gary
FROM: Tom Armstrong

I need the final, authoritative version of the following Voyager parameters:

Nominal values are okay. Give your best estimates of uncertainties.  Thanks.

  t T
A (AB coin.) 70 ns
B   70 ns
d   20 ns
d'   20 ns
a 2.4 ms 1.5 ms
b 2.4 1.5 ms
b' 2.4 1.5 s


Response from Steve Gary:

LECP Random Pulser Test
February 5, 1979
SN02

LEPT

Input Rate Output Rate
Random Rates:
855 cps 852
6419 6290
9950 9656
31606 28335
54354 44595
94400 66100
156000 81800
217000 91800
341000 103000
508000 110000
20000 18700
42600 36500
Fixed Rates:
148000 148000
173000 173000
193000 182000
205000 66000
225000 31700

February 22, 1979
D1-D2

r = R / (1+RT) 1 + RT = R/r
RT = R/r - 1
T = 1/r - 1/R = (R-r) / Rr
Live time = 1 - Rt
r = R(1 - rT)
r = R - rRT
R = r(1 + RT)
r = R / 1 + RT

r = 100 k
R = 260 k

T = (260k - 100k) / (260k)(100k) = 160k / 260(100)kk = 1.6 / 260k = 1.6 / .26M = 6.15 ms

R 1+RT r(calc) r(act)
10000 1.062 9420 9.6
20000 1.123 17800 18.5
40000 1.246 32100 35
80000 1.492 53600 58
150000 1.922 78100 82
250000 2.54 98400 99
500000 4.08 123000 110

 

Figure:  Feb. 5, 1979, LECP SN02, D1D2 Coincidence Strobe. Output Rate vs. Input Rate, Random Pulser Inputs ~1 MeV into Channels D1 and D2 (Rate Channel 3).

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Last modified 8/19/05, Tizby Hunt-Ward
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