The Galileo Energetic Particles Detector
Galileo EPD Handbook
Chapter 1. Instrument Summary
CMS Analog Electronics (Post-Challenger Information)
Source: The Galileo Energetic Particles Detector, D. J. Williams et al., Space Science Reviews, 60, 385, 1992 (excerpts)
Figure 1-16 shows a block diagram of the CMS analog electronics. The velocity measurement is made via the Time-to-Amplitude Conversion (TAC) electronics, which measure ion velocity by converting microchannel plate-produced start and stop charge pulses into a bipolar linear signal whose amplitude is proportional to the time-of-flight of the ions over a known distance. The analog signal shaping times are similar to those used on the other CMS channels.
Figure 1-16. CMS analog signal processing block diagram.
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Figure 1-17. CMS, new design. Source: Critical Design Review, Dec., 1987. |
Pulse Height Analyzer (PHA)
- Changes to Existing Circuit Boards
Source: Critical Design Review, Dec. 1987
- Functional Description of Changes
- Latch added for channel select line (J select)
- PHA "event active" signal definition changed
- Amplifier gains tailored
- Component Packaging: Minor Changes
- Parts Questions: None
- Functional Testing Results: No Problems
- Known Outstanding Design Issues: None
- Scope: Add 1 component; add 12 lines, remove 2
EPD PHA modifications block diagram
Continue: T.A.C. Board
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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.