Experimental Measurement of Low-Intensity and Long-Duration Internal Charging Behavior

Hands, Alexander and Ryden, Keith (2017) Experimental Measurement of Low-Intensity and Long-Duration Internal Charging Behavior IEEE Transactions on Plasma Science, 45 (8). pp. 1938-1946.

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Abstract

We report initial results from the EU FP7 Spaces- torm project on the experimental behavior of commonly-used space dielectric materials in an electron environment where the incident electron current is significantly below safe levels specified by design standards. The realistic electron environment facility (REEF), which uses an intense strontium-90 beta-emitting radioactive source to simulate the space environment, has been recommissioned at the University of Surrey for this purpose. Using a combination of shielding and variable source-sample separation REEF can achieve a very wide dynamic range in electron current, from the very high levels associated with an extreme space weather event, down to the levels below the Euro13 pean Cooperation for Space Standardization low temperature (<25 °C) safety threshold of 0.02 pA/cm2. In order to allow for the accumulation of significant levels of charge at such a low current, these experiments need to be run continuously for several weeks, far in excess of typical experimental investigations of internal charging phenomena. Here we report our early results from these experiments on samples of polyether ether ketone thermoplastic polymer material. Irradiating using a range of electron currents provides insight into the effect not just of inherent material properties but also of secondary effects such as radiation-induced conductivity.

Item Type:	Article
Subjects :	Electronic Engineering
Divisions :	Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :	Name Email ORCID Hands, Alexander a.hands@surrey.ac.uk Ryden, Keith k.ryden@surrey.ac.uk
Date :	12 April 2017
Funders :	EU Seventh Framework Program FP7
DOI :	10.1109/TPS.2017.2672079
Copyright Disclaimer :	Copyright 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Related URLs :	Publisher
Depositing User :	Symplectic Elements
Date Deposited :	10 Mar 2017 18:30
Last Modified :	16 Jan 2019 17:13
URI:	http://epubs.surrey.ac.uk/id/eprint/813754

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