A low-power timing discriminator for space instrumentation

Details A low-power timing discriminator for space instrumentation A low-power timing discriminator for space instrumentation

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rsci...75.5100d&link_type=abstract

Review of Scientific Instruments, Volume 75, Issue 12, pp. 5100-5105 (2004).

Mathematics

Logic

Astronomical And Space-Research Instrumentation, Magnetohydrodynamics And Plasmas, Circuits And Circuit Components, Mass Spectrometers, Time Of Flight Mass Spectrometry, Electron Impact: Secondary Emission, Pulse And Digital Circuits

Scientific paper

A front-end electronics for three-dimensional time-of-flight space plasma analyzers has been developed. These mass spectrometers, allowing the determination of the distribution functions of the main ion species, are based on the selection of the ion energy per charge and arrival direction using an electrostatic analyzer, and on the determination of their velocity from the time separating a start and a stop pulse. The start pulse is provided by the collection on a microchannel plate (MCP) of secondary electrons emitted when each ion crosses a thin carbon foil. The stop pulse is provided by the ion hitting a second MCP. The aim of the electronics presented in this article is to process the signals provided by MCPs to generate logic pulses, allowing the measurement of precise time differences. The design consists of an amplifier and a timing discriminator which performs a timing compensation to eliminate the time walk. A first version of the circuit has been developed and achieves a time walk of ~400 ps for an input amplitude dynamic range of 25 dB. The total power dissipation per channel is ~14 mW at an event rate of 100 KHz and ~19 mW at a rate of 1 MHz. The influence of the temperature on the circuit behavior has been investigated. The performances of the circuit in a complete detector were also evaluated. This circuit is designed to be used in various designs for future missions.

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