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Cross-Section Tables

The CREME96 SEE rate-calculation routines allows you to specify the SEE cross-section in a table. The table may be used for either proton-induced SEEs or direct-ionization ("heavy-ion") SEEs .

Your table must be contained in a file which you supply and transfer to the CREME-MC server using the CREME-MC upload procedure. The cross-section files must have names of the form "something.xsd", where "something" is the rootname you choose and ".xsd" is the extension.

Your .xsd file must conform to certain format requirements:

  • The .xsd file must consist of a two-column table, with the first column containing the independent variable (proton energy or effective LET) and the second column containing the cross-section.
  • Units:
    • Proton energies must be given in units of MeV.
    • Proton SEE cross-sections must be given in units of 10-12 cm2/bit (not per device!).
    • Effective LETs must be given in units of MeV-cm2/milligram (not per gram!)
    • Heavy-ion cross-sections must be given in units of square-microns/bit (not per device!).
  • The file must contain no extraneous information.
  • The file must be ordered according to increasing first-column value (ie, proton energy or effective LET).
  • The cross-section values must be fully-corrected for geometric and other effects.
  • Maximum number of cross-section values = 5000.
  • For more information on geometric effects, see:
    • "Geometical Factors in SEE Rate Predictions" by E.L. Petersen, J.C. Pickel, E.C. Smith, P.J. Rudek, and J.R. Letaw, IEEE Transactions on Nuclear Science, NS-40, No. 6, pp. 1888-1909, (December, 1993).
    • "Further Developments of the Heavy Ion Cross Section for Single Event Upset Model (HICUP) by L.W. Connell, F.W. Sexton, and A.K. Prinja, IEEE Transactions on Nuclear Science, NS-42,No. 6 , pp. 2026-2034 (December, 1995).
    • Ed Smith has recently developed a simplified version of HICUP, implemented in EXCEL, which simultaneously determines RPP dimensions and Weibull cross-section parameters from accelerator data. Contact ecsmith@edge.net for further details.

In using the cross-section table, the CREME96 software will:

  • Assume that the cross-section is zero at values below the first value in the table;
  • Assume that the last value in the table is the limiting cross-section for the device;
  • Use linear fits to interpolate between points in the table.
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