Voyager LECP

VOYAGER

Voyager LECP Data Analysis Handbook

Calibrations and Channel Definitions

LECP-010-74

April 6, 1974

To: LECP Group

From: T. P. Armstrong

Subject: LEPT Logic and PHA Design

I have completed a thorough study of the logic and passbands and have arrived at the following "final" list of channels and logic. I also suggest at this time "renormalization" of the detector and discriminator names as follows: (Only final naming is given. TPA, 6/26/2000)

2 Micron	EO	0.1 Mev
	EOA	0.3 Mev
	EOB	0.65 Mev
	EOC	1.45 Mev
	EOD	3.0 Mev
5 Micron	E1	0.1 Mev
	EIA	1.8 Mev
	EIB	4.5 Mev
	EIC	10.0 Mev
150 Micron	E2	0.1 Mev
	E2A	1.2 Mev
	E2B	5.5 Mev
	E2C	80.0 Mev
2500 Micron	E3	0.3 Mev
	E3A	2.05 Mev
	E3B	22.0 Mev
2500 Micron	E4	0.3 Mev
	E4A	2.05 Mev
	E4B	110.0 Mev
	E4C	950.0 Mev
100 Micron	E5	0.05 Mev
	E5A	0.1 Mev
	E5B	0.5 Mev
	E5C	19.0 Mev
	E5D	165.0 Mev
E1E20.6	L12A	0.3 (Mev)1.6
	L12B	2.0 (Mev)1.6
	L12C	22.8 (Mev)1.6
E2E30.6	L23A	60.0 (Mev)1.6
	L23B	512.0 (Mev)1.6
	L23C	1990.0 (Mev)1.6
E5E40.6	L54A	4.0 (Mev)1.6
	L54B	62.0 (Mev)1.6
	L54C	320.0 (Mev)1.6
	L54D	1990.0 (Mev)1.6

The set of channels I propose is as follows:
NOTE: underlined logic denotes anti-coincidence.

CHANNEL NUMBER	PRIORITY
1.	III	E1	E1A	E2	E2A	E3	L12A
2.	III	E1	E1A	E2A	E2B	E3	L12A
3.	III	E1	E1A	E2	E2B	E3	L12A	L12B
4.	III	E1	E1A	E2B	E3	L12A	L12B
5.	II	E1	E1B	E2	E3	L12B	L12C
6.	II	E1B	E1C	E2	E2C	E3
7.	II	E1	E1C	E2B	L12C	E3
8.	I	E1C	E2	E2C	E3
9.	I	E1B	E2C	E3
10.	III	E2A	E2B	E3	E3B	E4
11.	III	E2	E2A	E3A	E3B	E4
12.	III	E2B	E2C	E3	E4	L23A
13.	III	E2	E2B	E3B	E4	L23A
14.	II	E2A	E2C	E3	L23A	L23B	E4
15.	II	E2B	E3A	L23B	L23C	E4
43.	I	E2A	E3A	L23C	E4
16.	III	E5B	E4	L54A	E3
17.	III	E5B	E5C	E4	L54A	L54C	E3
18.	II	E5B	E5C	E4A	L54B	L54C	E3
19.	II	E5C	E5D	E4	E4B	L54C	L54D	E3
20.	II	E5B	E5D	E4B	E4C	L54C	L54D	E3
21.	I	E5B	E4A	E4C	L54D	E3
22.	I	E5B	E4C	L54D	E3
23.	III	E5A	E5B	E4A	E4B	E3A	E2
24.	III	E5B	E5C	E4A	E4B	E3A	E2
25.	II	E5B	E5C	E4B	E4C	E3B	E2
26.	I	E5C	E4B	E4B	E2
27.	III	E5A	E5B	E4A	E4B	E3A	E3B	E2	E2A
28.	III	E5B	E5C	E4A	E4B	E3B	E2	E2B
29.	II	E5B	E5C	E4B	E4C	E3B	E2
30.	I	E5C	E4C	E3B	E2
31.	III	E4	E4A	E3	E3A
32.	III	EO	EOA	E2	E2A	E3
33.	III	EOA	EOB	E2	E2A	E3
34.	II	EOB	EOC	E2	E2A	E3
35.	II	EOC	EOD	E2	E2A	E3
36.	I	EOD	E2	E2A	E3
37.		EOD	E2
38.		EOB	EOD	E2
39.		EOA	EOB	E2
40.		E5	E5A	(Weak Magnetosphere)
41.		AL	AR	(Left & Right Shield Coinc.)
42.		AL Left Shield		Subcommutate
		AR Right Shield
		E1
		E2
		E3
		E4
		E5
43.	(See following #15)

PRIORITY CATEGORIES

Highest, Heavy Particles

(1 2 3)	Ch.8,9
(0 2 3)	Ch.36
(2 3 4)	Ch.43
(5 4 3)	Ch.21,22
(5 4 3 2 )	Ch.26
(5 4 3 2)	Ch.30

II. Intermediate

(1 2 3)	Ch.5,6,7
(0 2 3)	Ch.34,35
(2 3 4)	Ch.14,15
(5 4 3)	Ch.18,19,20
(5 4 3 2)	Ch.25
(5 4 3 2)	Ch.29

III. Lowest

(1 2 3)	Ch.1,2,3,4
(0 2 3)	Ch.32,33
(2 3 4)	Ch.10,11,12,13
(5 4 3)	Ch.16,17
(5 4 3 2)	Ch.23,24
(5 4 3 2)	Ch.27,28
(4 3)	Ch.31

FIGURES:

Figure 1 Channels in the 5-150 micron combination for the coincidence condition (1 2 3).

Figure 2 Channels in the 2-150 micron combination for the coincidence condition (0 2 3).

Figure 3 Channels in the 150-2500 micron combination for the coincidence condition (2 3 4).

Figure 4 Channels in the 100-2500 micron combination for the coincidence condition (5 4 3).

Figure 5 Channels in the 100-2500 micron combination for the coincidence condition (5 4 3 2) and 5 4 3 2.

Figure 6 Channels in the 2500-2500 micron combination for the coincidence condition (5 4 3 2) and 5 4 3 2.

Pulse Height Analysis Sampling Scheme

Each PHA data set should include the following items:
1. Rate Channel Indicator (6 bits)
2. Detector Identifier E0, Ela, Elb, Elc (1 bit)
3. First Detector PHA (8 bits) (EO, Ela, Elb, E5) *
4. Second Detector PHA (8 bits) (E2)
5. Third Detector PHA (8 bits) (E3)
6. Fourth Detector PHA (8 bits) (E4)
*EO, Ela, Elb are the thin detectors which share a log amp – the choice is between E5 and the shared thin detector output.
Rotating Priority Scheme

After a I event, the priority is II/III/I for the next event.

After a II event, the priority is III/I/II for the next event.

After a III event, the priority is I/II/III for the next event.

Failure Modes

In the detailed logic design Ed Tums will look for the opportunities to override the PHA priority scheme and enable, by command, PHA if any pair of detectors is triggered.

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Updated 8/9/19, Cameron Crane

VOYAGER 1 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
September 5, 1977, 12:56:00:00 UTC

VOYAGER 2 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
August 20, 1977, 14:29:00:00 UTC

QUICK FACTS

Manufacturer: Voyagers 1 and 2 were built in the Jet Propulsion Laboratory in Southern California.

Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).

Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.

Calibrations and Channel Definitions

VOYAGER 1 ELAPSED TIME

VOYAGER 2 ELAPSED TIME

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