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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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Example ch1
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A. Sytov
INFN Ferrara Division, sytov@fe.infn.it
INTRODUCTION
Example ch1 is an easy demonstration of the minimum requirements necessary
to integrate the G4ChannelingFastSimModel and the G4BaierKatkov model into a project
in order to simulate the physics of channeling and
channeling radiation/coherent bremsstrahlung.
This example serves as a guideline for users on how to add this physics
to their existing Geant4 projects. It includes the minimum necessary options
to incorporate this physics. Specifically, it requires registering
G4FastSimulationPhysics in the main routine and
adding a few lines of code in DetectorConstruction.
DESCRIPTION
The example is based on the following experiments on channeling [1] and
channeling radiation [2] in a bent crystal, carried out at Mainz Mikrotron MAMI with
855 MeV electrons. The experimental validation of G4ChannelingFastSimModel is
described in [3].
This example includes a bent crystal and a detector positioned behind it.
The incoming beam is set up in macro run.mac.
The example does not include any input of the model or geometry parameters
from the macro to keep it as straightforward as possible. The output is recorded
into the file results.root. It consists of
the charged particle distribution at the detector in the x-plane
(the plane of crystal bending and perpendicular to the crystal planes) as well as
the spectrum of photons arriving to the detector. To build these plots, one has to
open this file in root and use x_out->Draw() and Spectrum->Draw() for the coordinates
and the spectrum, respectively.
REFERENCES
[1] A. Mazzolari et al. Phys. Rev. Lett. 112, 135503 (2014).
[2] L. Bandiera et al. Phys. Rev. Lett. 115, 025504 (2015).
[3] A. Sytov et al. Journal of the Korean Physical Society 83, 132–139 (2023).
Gabriele Cosmo