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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%\title[GEANT4/EGS5]{GEANT4/EGS5}

\title{EGS5/GEANT4}

\author{Sho Uemura}
%\institute[MIT]{MIT --- Department of Physics\\}
\date[August 13, 2010]

\begin{document}

%\begin{frame}
%  \titlepage
%\end{frame}

\begin{frame}{Comparing simulation software}
\begin{itemize}
	\item GEANT4: used for tracking, trigger
	\item EGS5: used for tracker occupancy
	\item A simple direct comparison: compute beam background with both programs
\end{itemize}
\end{frame}

\begin{frame}{Comparing simulation software}
\begin{itemize}
	\item Compare beam background computed using EGS5 and Geant4
	\begin{itemize}
		\item $10^9$ beam electrons, 0.10\% $X_0$ and 0.25\% $X_0$ targets
		\item After the target, particles >5 mrad away from $y=0$ are dumped to ASCII data file
		\item Data file is read by Geant3, which does magnetic field tracking
	\end{itemize}
\end{itemize}
\end{frame}

%\begin{center}
%\begin{tabular}{c|c}
%Parameter & Observed value \\
%\hline
%$T$ & $6.5\pm 0.1$ K\\
%$4\Delta/e$ & $5.516\pm0.006$ mV\\
%$2I_0$ & $365\pm5$ $\mu$A\\
%\end{tabular}
%\end{center}

\begin{frame}{Layer 1 occupancies}
\begin{itemize}
	\item For inner strips, Geant4 occupancies are greater by factor of 2
	%\item This extends dead zone by $5\mu$m
\end{itemize}
\begin{center}
	\includegraphics[width=.45\textwidth]{025_occup1}
	\includegraphics[width=.45\textwidth]{010_occup1}
\end{center}
\begin{columns}
	\column{.5\textwidth}
	\begin{center}
		0.25\% $X_0$
	\end{center}
	\column{.5\textwidth}
	\begin{center}
		0.10\% $X_0$
	\end{center}
\end{columns}
%\tiny 6.6 K, no external field, 200 Hz sine wave sweep}
\end{frame}

\begin{frame}{Occupancies by particle type}
\begin{itemize}
	\item Geant4 and EGS5 show good agreement at larger scattering angles
	\item Large difference in photon production - nearly factor of 10
	\item Good agreement on positrons
	%\item This extends dead zone by $5\mu$m
\end{itemize}
\begin{center}
	\includegraphics[width=.3\textwidth]{025_occup1_electrons}
	\includegraphics[width=.3\textwidth]{025_occup1_photons}
	\includegraphics[width=.3\textwidth]{025_occup1_positrons}
\begin{columns}
	\column{.3\textwidth}
	\begin{center}
		$e^-$
	\end{center}
	\column{.3\textwidth}
	\begin{center}
		$\gamma$
	\end{center}
	\column{.3\textwidth}
	\begin{center}
		$e^+$
	\end{center}
\end{columns}
\end{center}
%\tiny 6.6 K, no external field, 200 Hz sine wave sweep}
\end{frame}

\begin{frame}{Energy distributions}
%\begin{itemize}
%	\item Geant4 and EGS5 show better agreement at larger scattering angles
%	\item Large difference in photon production - nearly factor of 10
%	\item Good agreement on positrons
%	%\item This extends dead zone by $5\mu$m
%\end{itemize}
\begin{center}
	\includegraphics[width=.3\textwidth]{025_en_electrons}
	\includegraphics[width=.3\textwidth]{025_en_photons}
	\includegraphics[width=.3\textwidth]{025_en_positrons}
\begin{columns}
	\column{.3\textwidth}
	\begin{center}
		$e^-$
	\end{center}
	\column{.3\textwidth}
	\begin{center}
		$\gamma$
	\end{center}
	\column{.3\textwidth}
	\begin{center}
		$e^+$
	\end{center}
\end{columns}
\end{center}
%\tiny 6.6 K, no external field, 200 Hz sine wave sweep}
\end{frame}

\end{document}

