The Galileo Energetic Particles Detector

Galileo EPD Handbook

Chapter 1. Instrument Summary

Galileo T.A.C. Board

Source: Critical Design Review, Dec., 1987.

Design requirements:

• Process start/stop pulses corresponding to flight times between 5 nS and 50 nS and output a voltage waveform representing time of flight
• Reject all start pulse only (singles)events
• Output:
  1. An AC coupled pulse with its positive lobe peak voltage representing time of flight
  2. A digital start pulse for all start input pulses
  3. A digital T.A.C. pulse for all valid T.A.C. events (start and stop)

Design Guidelines:

• Adapt successful GIOTTO T.A.C. design concept for the Galileo EPD Time of Flight
• Interface directly with existing Galileo EPD hardware
• Use GIOTTO input hybrids to detect start/stop pulses down to a few mv
• Reset/enable quickly following start only (singles) events
• Expected total dose: 2.5 x 105 Rad Si

	Figure 1-18. EPD TAC Electronics. Source: Critical Design Review, December 1987.
	Figure 1-19. Schematic of EPD TAC board.  Source: Critical Design Review, December 1987.

Figure 1-20. Output Waveforms.

	Figure 1-21 TAC output vs. TOF (22°C)
	Figure 1-22  TAC output vs. TOF (-25°C, +50° C)

Next: CMS Analog Electronics (Pre-Challenger Information) 

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