The user should be able to choose the "unit" of waveforms.

[schustermartin]

While I agree that it is correct that we simulate the actual induced charge on the preamplifiers and it does e.g. influence the number of charges in the charge cloud, I think in many use-case scenarios it is an unnecessary complication to manually multiply the output waveform with the corresponding E_ionisation, to obtain a "calibrated" pulse. This could be integrated into SSD.

One solution would be introducing a keyword to the get_signals! function, e.g. calibrated = true.
Then SSD would return e.g. 100 keV pulse for a 100 keV energy deposition, while still handling things correctly under the hood.

An alternate name for the keyword could be unit = :energy or :charge, respectively. Thoughts?