Absolutely no scattering is taken into account in this simulation, primarily because the very nature of the scattering is complex and in most cases impossible to include due to lack of information.  Unwanted scattering of electrons can cause electrons to hit and register on the detector that would not normally make it there.

The other flaw in the model is the fact that it assumes 100% counting efficiency for the detector.  That is, if an electron makes it through the telescope to the detector surface, the simulation automatically assumes that the detector counts the hit.  But in reality, not all electrons making it to the detector end up registering as a count. To put it another way, the simulation assumes 100% counting efficiency whereas in reality this is rarely the case.  Before the flight instrument was launched, a calibration was done to determine the electron counting efficiency for an electron beam coming in at various angles and positions from Shodhan's y-axis.  Figure A9-17 compares calibration results with the simulation.  It turns out that the true efficiency of any slab-like detector is going to depend not only on electron energy, but also the angle at which the electron intercepts the detector.  Section A9-11 gives the rest of the calibration results.

In conclusion, the results of this study of the geometric factor of the deflected electrons for the Ulysses HISCALE instrument reveal that the simulation is not sufficiently accurate to give reliable values.  More reliable are the ratio and spectra plots that use actual data and involve all three counting instruments aboard HISCALE.

Figure A9-17  A plot comparing Kohl's electron efficiency study with the simulation.  Note how angular cutoff positions match up, but overall values for nonzero efficiencies cannot be accounted for with the simulation.

Next: Appendix 9.5 - Listing of Coordinate Labels and Plane Coefficients