The Galileo Energetic Particles Detector
Galileo EPD Handbook
Chapter 1. Instrument Summary
TABLE 14. CMS CHANNEL DESCRIPTION
Revised 19 April, 1985, TPA
Channel Name |
Energy Range (MeV) |
Species (MeV) | Logic | |
CE1 | Electrons | 0.050-0.100 | (JaP1) (JcP) | KE1 (K0) (L0) |
CE20 | 0.100-0.200 | (JaP1) (JcP) | K0 (KE2) (L0) | |
CE30 | 200>0.300 | (JaP1) (JcP) | KE2 (K1) | |
CP1 | Protons | 0.200-0.290 | JaP1 (JaP2) | (K0) |
CP2 | 0.290-0.500 + | JaP2 (Ja0) | (K0) | |
CP3 | 0.05-1.4 | JaP1 (Ja0) | K0 (K1) (L0) | |
CA0 | Alphas | 0.08-0.19 + | Jc0 (Jcl) | (K0) |
CA1 | 0.17-0.39 + | Ja0 (Ja1) | (K0) | |
CA2** | 0.19-0.45 | Jc0 (Jc1) | K1 (L0) T1 (T2) | |
CA3** | 0.38-0.80 | Ja0 (Ja1) | K0 (K2) (L0) T1 (T2) | |
(T2) | ||||
CA4** | 0.80-1.8 | Ja0 (Ja1) | K2 (K5) (L0) | |
CM0 | Medium Nuclei | 0.08-0.15 + | Jc1 (Jc3) | (K0) |
CM1 | 0.16-0.45 + | Ja1 (Ja3) | (K0) | |
CM2** | 0.14-0.59 | Jc1 (Jc3) K0 | (K3) (L0) T2 (T3) | |
(T3) | ||||
CM3** | 0.41-1.0 | Ja1 (Ja3) K0 | (K4) (L0) T2 (T3) | |
(T3) | ||||
CM4** | 1.0-2.7 | Ja1 (Ja3) (S1) | K4 (K5) (L0) | |
CM5** | 2.7-10.7 | Ja0 | (S1) K5 (L0) | |
CN0** | Intermediate Nuclei | 0.91-2.0 | [S1 or Ja3] (Ja4) | K4 (K5) (L0) |
CN1** | 2.0-11.7 | S1 (S2) | K5 (K6) (L0) | |
CH0 | Heavy Nuclei | 0.025-0.035 + | Jc3 (Jc4) (K0) | |
CH1 | 0.07-0.10 | Ja3 (Ja5) (K0) | ||
CH2** | 0.11-0.37 | [Jc3 or {T3 and Jc1}] (Jc4) | K0 (K3) (L0) | |
CH3** | 0.33-0.8 | Ja3 (Ja5) K0 (K4) (L0) T3 | ||
CH4** | 0.8-1.7 | Ja4 (Ja5) K4 (K5) (L0) | ||
CH5 | 1.7-13.0 | S2 (Ja5) K5 (L0) | ||
JaS | Singles Rates | Ja0 JbS | Ja0 JcS | Jc0 KS K0 LSL0 |
NOTES:
+ High energy limit will be greater for the 180 end, when
Detector K does not provide a reliable anticoincidence
cut-off. Single parameter channels.
** An event in these channels may also be transmitted as a
CMS PHA event.
TABLE 15. EPD CMS
Discriminator Levels
Measured 7/6/84
Discriminator |
Energy (MeV) | PHA | |
Name | Address | ||
Ja00 | 23 | 0.42 | 23 |
Ja0 | 24 | 0.635 | 43 |
Ja1 | 25 | 2.00 | 97 |
Ja3 | 26 | 9.22 | 176 |
Ja4 | 27 | 12.5 | 191 |
Ja5 | 28 | 38.8 | 251 |
Ja | Thresh | 0.52 | |
Jb | Thresh | 0.52 | |
JaP1 | 21 | 0.15 | |
JaP2 | 22 | 0.24 | |
Jc0 | 21 | 0.26 | 22 (+6,-6) |
Jc1 | 22 | 1.15 | 106 (+4,-4) |
Jc3 | 23 | 5.02 | 198 |
Jc4 | 24 | 10.7 | 244 |
K0 | 31 | 0.12 | 44 (+3.-3) |
K1 | 32 | 1.30 | 121 |
K2 | 33 | 1.26 | 119 |
K3 | 34 | 5.80 | 161 |
K4 | 35 | 7.95 | 169 |
K5 | 36 | 48.5 | 216 |
L | 0.085 |
S1 and S2 must be readjusted.
(Slope in log space = -0.78 for both discriminators.
S1 through J = 6.7 MeV, K = 48 MeV.
S2 through J = 12.0 MeV, K = 48 MeV.)
TABLE 16. CMS System Commands
PRIME SELECT | Controls the four signal-select switches, choosing from either 0 degree or 180 degree end of telescope |
T OVERRIDE | Removes time-of-flight requirements from rate definitions |
HI-LOW BIAS | Chooses either of two bias voltages for Ja' and Jc' detectors |
A ON | Applies power to Ja/Ja' and Ka' linear processing circuitry |
B ON | Applies power to Jb linear processing circuitry |
C ON | Applies power to Jc/Jc' and Kc' linear processing circuitry |
L ON | Applies power to L linear processing circuitry. |
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Updated 8/23/19, Cameron Crane
QUICK FACTS
Mission Duration: Galileo was planned to have a mission duration of around 8 years, but was kept in operation for 13 years, 11 months, and 3 days, until it was destroyed in a controlled impact with Jupiter on September 21, 2003.
Destination: Galileo's destination was Jupiter and its moons, which it orbitted for 7 years, 9 months, and 13 days.