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Thomas Prokscha
2016-08-12 18:22:59 +02:00
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@ -35,14 +35,17 @@ $^3$ ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K.
%E-mail: ksedlak@fzu.cz} %E-mail: ksedlak@fzu.cz}
\maketitle \maketitle
\footnotesize
\begin{center}
PSI, August 12th, 2016
\end{center}\vspace{2mm}
\normalsize
\abstracts{ \abstracts{
``musrSim'' is a simulation program based on Geant4, ``musrSim'' is a simulation program based on Geant4,
optimised for the $\mu$SR instruments. optimised for the $\mu$SR instruments.
This document describes some of the commands used in the user macros This document describes some of the commands used in the user macros
of the simulation program for the $\mu$SR instruments based on the {\sc of the simulation program for the $\mu$SR instruments based on the {\sc
Geant4}. The root output variables are also described. Geant4}. The root output variables are also described.}
}
%======================================================================================================== %========================================================================================================
\section{Scope of the musrSim program} \section{Scope of the musrSim program}
@ -587,6 +590,21 @@ care.
Switches off the statistical fluctuations in the ionisation losses. Can be usefull Switches off the statistical fluctuations in the ionisation losses. Can be usefull
for some technical studies. Presently works only for \emph{G4eIonisation} and for some technical studies. Presently works only for \emph{G4eIonisation} and
for \emph{G4MuIonisation}. for \emph{G4MuIonisation}.
\end{description}
\noindent For the interaction of keV $\mu^+$ with nanometer-thin carbon foils -- as they are used in the
low-energy $\mu^+$ beam line and spectrometer (LEM) at PSI -- two special processes have been
defined:
\begin{description}
\item{\bf /musr/command process addProcess mu+ musrMuFormation -1 -1 2}\\
Mu formation: yield function as well as the parameters are taken from: M. Gonin, R. Kallenbach, P. Bochsler: "Charge exchange of hydrogen atoms in carbon foils at 0.4 - 120 keV", Rev.Sci.Instrum. 65 (3), March 1994.
\item{\bf /musr/command process addProcess mu+ musrMuEnergyLossLandau -1 -1 1}
\item{\bf /musr/command SetLandauMPV 0.01}
\item{\bf /musr/command SetLandauSigma 0.2}\\
This adds to any enabled G4 energy loss process a Landau distribution with most-probable-value
\emph{SetLandauMPV} (keV), and width \emph{SetLandauSigma} (keV).
% There is one special process, combined from G4MultipleScattering and G4CoulombScattering, % There is one special process, combined from G4MultipleScattering and G4CoulombScattering,
% defined by the following command:\\ % defined by the following command:\\