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Persistent URL http://purl.org/net/epubs/work/36658
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Record Id 36658
Title Report on demonstration of particle-induced background in detectors analysis
Abstract This document presents the results of SEDAT work package 304 which is a demonstration of the application of SEDAT to perform an analysis of particle-induced background in X-ray detectors. There are several aspects of this application and these are reflected in the subsequent sections of the document. Section 3 describes the implementation of the PIB analysis model as a SEDAT tool. This tool takes in electron fluxes from the SEDAT database and estimates the consequent PIB fluxes. It is described in detail here as it is a key element of WP304. Similarly section 4 describes the orbit generator that has been implemented for SEDAT. This uses sets of closely-spaced Keplerian elements as its input; these are available for example from the USOC tool used within ESA. Section 5 describes the datasets used in this workpackage. These include the extensive ISEE-2 dataset that was used in previous ESA work and is also the mainstay of this work (because of its comprehensive coverage of near-Earth space). The other electron dataset used here is the AMPTE-UKS dataset produced by RAL. This does not give such good coverage of near-Earth space as ISEE-2 but it has better coverage of the key electron energies (around 1 keV) for PIB generation. Thus it can provide a useful check on the extrapolation needed when using ISEE-2 data. Section 5 also includes a discussion on the orbit data and its ingestion into SEDAT. Section 6 describes the comparison between results from previous ESA work and equivalent results produced from analysis of the same data (ISEE-2) as part of this workpackage. We show that there is good agreement between the two analyses. Section 7 describes the results of applying the tools developed in section 6 to a different dataset - namely the AMPTE-UKS electron data. We find that there is broad agreement when comparing the total electron fluxes estimated from the two datasets but that there are some interesting differences when comparing the corresponding PIB fluxes. The AMPTE-UKS dataset suggests the presence of higher PIB fluxes in the vicinity of the magnetopause. This requires further study. Section 8 describes a tool that can estimate the likely range of PIB fluxes along an arbitrary trajectory. It does this by finding energetic electron fluxes previously measured at positions close to points on that trajectory and then deriving PIB spectra from those fluxes. This yields a large set of PIB values at each of many points on the trajectory. Thus we can derive useful statistics such as the minimum, median and maximum PIB flux at each point. Examination of results suggests that it is more profitable to specify closeness in terms of magnetic coordinates such as L value (rather than geometrically). Section 9 presents a summary of the work and makes some suggestions for further work.
Organisation CCLRC , SSTD
Keywords detector background , Physics , space weather
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report Report on demonstration of particle-induced background in detectors analysis, RAL-SED-RP-0304. wp304_report_v5.pdf 2005