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The Galileo Energetic Particles Detector


Galileo EPD Handbook


Chapter 1. Instrument Summary




Species  Energy Range
Old design (pre-Challenger), later eliminated
CE1 Electrons 0.050-0.100 (JaP1) (JcP) KE1 (K0) (L0)
CE2   0.100-0.200 (JaP1) (JcP) K0 (KE2) (L0)
CE3   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 Jc Channels (Alphas) 0.08-0.19 + Jc0 (Jcl) (K0)
CA2**   0.19-0.45 Jc0 (Jc1) K1 (L0) T1 (T2)
CM0 Jc Channels (Medium) 0.08-0.15 + Jc1 (Jc3) (K0)
CM2**   0.14-0.59 Jc1 (Jc3) K0 (K3) (L0) T2
CH0 Jc Channels (Heavy) 0.025-0.035 + Jc3 (Jc4) (K0)
CH2**   0.11-0.37 [Jc3 or {T3 and Jc1}] (Jc4) K0 (K3) (L0)
JcS Jc & L Singles   Jc0
LS     L0
New channels, replacing the above eliminated channels; TOF x E;  geometrical factor: 0.007 cm2 sr
TP1 Protons 0.08-0.22  
TP2   0.22-0.54  
TP3   0.54-1.25  
TA1 Alphas 0.027-0.155  
TA2   0.155-1.00  
TO1 Medium Nuclei (CNO) 0.012-0.026  
TO2   0.026-0.051  
TO3   0.051-0.112  
TO4   0.112-0.562  
TS1 Intermediate Nuclei (S) 0.016-0.030  
TS2   0.030-0.062  
TS3   0.062-0.31  
TH1‡ Heavy Nuclei (Fe) 0.02-0.20  
TACS‡ New TOF Sensor Singles    
Delta E x E (old design channels--no change);  geometrical factor for Ja channels - 0.008 cm2 sr; geometrical factor for Jb channels - 0.025 cm2 sr  (Col. 3 below from "instrument paper.")
CA1  Alphas 0.17-0.49 Ja0 (Ja1) (K0)
CA3**   0.49-0.68 Ja0 (Ja1)K0 (K2) (L0) T1 (T2)
CA4**   0.68-1.4 Ja0 (Ja1)K2 (K5) (L0)
CM1  Medium Nuclei (O) 0.16-0.55 Ja1 (Ja3)(K0)
CM3**   0.55-1.1 Ja1 (Ja3) K0(K4) (L0) T2
CM4**   1.1-2.9 Ja1 (Ja3) (S1)K4 (K5) (L0)
CM5**   2.9-10.7 Ja0(S1) K5 (L0)
CN0** Intermediate Nuclei (Na) 1.0-2.2 [S1 or Ja3] (Ja4)K4 (K5) (L0)
CN1**   2.2-11.7 S1 (S2)K5 (K6) (L0)
CH1 Heavy Nuclei (Fe) 0.22-0.33 Ja3 (Ja5) (K0)
CH3**    0.33-0.67 Ja3 (Ja5) K0 (K4) (L0) T3
CH4**   0.67-1.3 Ja4 (Ja5) K4 (K5) (L0)
CH5   1.3-15.0 S2 (Ja5) K5 (L0)
JaS Singles Rates   Ja0 JbS Ja0 JcS Jc0 KS K0 LSL0


All underlined channels are in the main array.
+ 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.
‡ These channels are read out every 8/3 seconds.  All other CMS channels are read out every 4/3 seconds.



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Updated 8/23/19, Cameron Crane


Manufacturer: The Galileo Spacecraft was manufactured by the Jet Propulsion Laboratory, Messerschmitt-Bölkow-Blohm, General Electric, and the Hughes Aircraft Company.

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.