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Forum: Processes Involving Optical Photons
Re: Question Problem in Scintillation Simulation with Nonlinear Light Yield (Xing Zhang)
Re: Feedback Re: Problem in Scintillation Simulation with Nonlinear Light Yield (Gumplinger Peter)
Date: 20 Jan, 2012
From: Gumplinger Peter <Gumplinger Peter>

> Your question can be reworded: What does it take to induce the 9.13MeV proton

> to lose all of its energy in one single step? Good question, I actually don't

> know the answer.

Michel Maire provided me with the following recipe:

From Em physics, there are 3 families of constraints that can limit the step size:

1- production of secondary (ionis and brem). To prevent them, put an infinite cut (1 km):

/run/setCut 1 km

2- limitation of continuous energy loss: dRoverRange. Control it via StepFunction

/process/eLoss/StepFunction 1 1 m

The first 1 means (dRoverRange) dR/R = 100%; e.g. the allowed max. decrease in stopping range per step, and the second 1m is the lower limit of step size (finalRange). For details, see the Physics Reference Manual 7.1.3

3- multiple scattering. I do not know how to suppress the constraint, except by deactivate msc

/process/inactivate msc

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