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A Small Instrument for Low Energy Particle Observations in the Heliosphere

Cummings, J. R. and Cook, W. R. and Mewaldt, R. (1993) A Small Instrument for Low Energy Particle Observations in the Heliosphere. In: Proceedings of the Small Instrument Workshop. National Aeronautics and Space Division , Washington, DC, pp. 1-3.

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We describe a lightweight and low-power sensor to measure energetic ions from solar, galactic, and heliospheric sources. This sensor is based on the Low Energy Telescopes (LETs) carried by the Voyager spacecraft as part of the Cosmic Ray Subsystem. The energy range of the particles detected can be adjusted by altering the detector thicknesses, but the nominal Voyager LET responds to all nuclei from protons· through nickel (Z = l to 28) over energy ranges of ~0.5 to 8 Me V for protons and ~5 to 30 Me V /nucleon for iron. We also discuss the characteristics of the electronics required to support the sensor. The analog electronics would consist of custom VLSI circuits of low mass and low power. The digital electronics would require an Actel gate array and a microprocessor. The detectors would require biases up to ~100 V. Assuming that low voltages woul4 be supplied from a common supply on the spacecraft that services all instruments, the total weight and power of such a system is ~250 g and 400 mW.

Item Type:Book Section
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URLURL TypeDescription
Mewaldt, R.0000-0003-2178-9111
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1993-29
Record Number:CaltechAUTHORS:20140516-111434018
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45805
Deposited By: Deborah Miles
Deposited On:01 Jun 2014 16:16
Last Modified:22 Nov 2019 09:58

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