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DepositionPointCharge: Allow Configuration of e/h in MIP Model

Simon Spannagel requested to merge deppoint_eh into master

This adds an interpretation of the number_of_charges parameter also in the MIP model, where up to now we had a fixed deposition of 80 e/h per micron.

There are two possible implementations of this:

  • Interpret the parameter as "charge carriers per step" where the number of steps is defined via the number_of_steps parameter.
    • Pro: direct relation between the parameters,
    • Con: usually value is know per micron, parameter value needs to be calculated using sensor thickness, number of steps and eh pairs per micron.
  • Interpret the parameter as "charge carriers per unit length".
    • Pro: easier to set the desired parameter directly without relying on other quantities,
    • Con: non-obvious unit for the parameter, different units for mip and point models.

I think both are valid, here I have implemented the latter.

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