The input parameters and options for the trapped radiation models are described below. When the input form has been completed, pressing the button will start the calculation and bring up the "Results" page.
Two mechanisms can create SEUs: direct ionisation by ions transported through the spacecraft skin, or ionisation by secondary particles produced by proton nuclear interactions. The parameters for each mechanism have to be supplied if the ion energy and LET spectra contain protons. For both mechanisms, model parameters can be entered, or, alternatively, experimental cross section data can be used.
By default the model for direct ionization assumes that the maximum LET of the stopping ion applies over its entire path length in the sensitive volume which may result in calculated energy depositions that exceed the residual energy of the ion. An improved algorithm, that accounts for the variation of the LET inside the volume, has been implemented but is only available for the advanced user.
The report file spenvis_uop.html contains the input parameters and summary tables. The upset rate file spenvis_uoo.txt contains, for each orbital point, the direct ionisation and proton induced nuclear reactions upset rates, as well as the combined upset rates. This file is only produced when the output resolution for the ion energy and LET spectra was set to full spectra for each orbital point. The experimental cross section data supplied by the user are stored in the spenvis_uof.txt file.
spenvis_uop.html
spenvis_uoo.txt
spenvis_uof.txt
spenvis_uol.txt
Plots are available only when the output resolution for the ion energy and LET spectra was set to full spectra for each orbital point, or when experimental cross section data or path length distribtions are supplied by the user.
To generate plots, select the plot type(s), options and graphics format, and click the or button. The current page will be updated with the newly generated plot files.