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

\title{Beam halo hitting L1 edge}

\author{Sho Uemura}
\institute{SLAC}
\date[July 1, 2016]

\begin{document}

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

\begin{frame}{Tridents at +Z}
	\begin{itemize}
		\item Remove L1 requirement (necessary to get displaced A' acceptance), get crud at +Z that doesn't show up in MC
		\item These plots are with minimal cuts, but the crud does not go away with cuts
		\item Clearer if you require no L1 hits
	\end{itemize}
	\begin{center}
		\includegraphics[width=0.5\textwidth,page=1]{goldenhalo}
		\includegraphics[width=0.5\textwidth,page=4]{goldenhalo}
	\end{center}
\end{frame}

\begin{frame}{Z vs. Y}
	\begin{itemize}
		\item Looks like L1
		\item Top and bottom are visible: 50-60 events in bottom, 150-200 in top
	\end{itemize}
	\begin{center}
		\includegraphics[width=0.5\textwidth,page=5]{goldenhalo}
		\includegraphics[width=0.5\textwidth,page=8]{goldenhalo}
	\end{center}
\end{frame}

\begin{frame}{Empty target run}
	\begin{itemize}
		\item Run 5790: 0.5 hour (compared to 4.5 hours of unblind golden runs)
		\item L1 top is clearly visible, nothing else is (but statistics are low)
		\item So we see stuff, but the normalization doesn't really work out: do FEEs scattered in the target add significantly to the halo?
	\end{itemize}
	\begin{center}
		\includegraphics[width=0.5\textwidth,page=1]{emptyhalo2}
		\includegraphics[width=0.5\textwidth,page=5]{emptyhalo2}
	\end{center}
\end{frame}

\begin{frame}{Empty target: FEEs}
	\begin{itemize}
		\item Can see FEEs hitting inactive and active material on L1
	\end{itemize}
	\begin{center}
		\includegraphics[width=0.5\textwidth,page=1]{emptyfee}
		\includegraphics[width=0.5\textwidth,page=2]{emptyfee}
	\end{center}
\end{frame}

\begin{frame}{Empty target: FEEs}
	\begin{itemize}
		\item Lower plot: extrapolated L1 position is shifted up because both halves of L1 are shifted by 3/16'' (top is at Z=95, bottom is at Z=105)
	\end{itemize}
	\begin{center}
		\includegraphics[width=0.7\textwidth,page=7]{emptyfee}
	\end{center}
\end{frame}

\begin{frame}{Dealing with this}
	\begin{itemize}
		\item May need to cut some regions out of the Z vs. Y distribution
			\begin{itemize}
				\item Would help if we can more cleanly identify these events
			\end{itemize}
		\item Some impact on reach; not sure how much
	\end{itemize}
\end{frame}

\end{document}
