Fundamental Technologies

Galileo Spacecraft Pages

CMS Subsystem

This section on the CMS subsystem is organized as follows:

CMS Subsystem - Post-Challenger (as flown)

Source: The Galileo Energetic Particles Detector, D. J. Williams et al., Space Science Reviews, 60, 385, 1992 (excerpts).

The CMS is designed to measure the composition of ions in the Jovian environment from energies of 10 keV nucl-1 to 10 MeV nucl-1. This system contains two types of energetic particle telescopes, shown schematically in Figure 1-11.  A small time-of-flight (TOF) telescope looks in the 0 direction while a pair of DE x E solid state detector telescopes (JK detectors) covering higher energies are oriented in the 180 direction.

The TOF portion of CMS is a replacement of the original EPD TOF telescope built for launch in early 1986. JPL, NASA, and the Bundesministerium fur Forschung und Technologie allowed us the opportunity to take advantage of new technology in order to lower our energy threshold for composition measurements by at least a factor of ten....The new TOF telescope, its high voltage power supply, the new TOF circuitry, and the major modifications to the electronics subsystem were designed, built, tested, and integrated into the EPD in 1987 and 1988.  All instrument and spacecraft tests and calibrations were successful and were indicative of an instrument response that exceeded expectations.

CMS Channel Descriptions: Table 6

Figure 1-12a. Detail of EPD CMS detector head (as flown).

Figure 1-12b. Schematic cross-section of TOF system. Source: Critical Design Review, Dec. 1987.

Figure 1-12c. Detailed cross-section of TOF system. Source: Critical Design Review, Dec. 1987.

High Voltage Output Filter
Source: Critical Design Review, December 1987, MPAe

Part No.Function Type-Value Factory
R50m film resistorRNR55 100k Da6
R51m film resistorRNR55 3k Da6
R52m film resistor102 W RNR55Da6
R53m film resistor1.2k RNR55Da6
R54m film resistor1.5k RNR55Da6
R55m film resistor102 W RNR55Da6
R56m film resistor" Da6
R57m film resistor" Da6
R58m film resistor" Da6
R59m film resistor" Da6
R60m film resistor" Da6
R61m film resistor" Da6
R62m film resistor" Da6
R63m film resistor" Da6
R64m film resistor" Da6
R65m film resistor" Da6
R66m film resistor" Da6
R67m film resistor

100 W RNR55


High Voltage Output Filter - schematic and details:

Next: Post-Challenger Revisions: Hardware Changes

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Updated 3/2/04, T. Hunt-Ward