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

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

\title{Neutron detector concept}

\author{Sho Uemura}
%\institute{bumming around}
\date[February 12, 2018]

%\titlegraphic{
%\includegraphics[height=0.1\textheight]{SLAC_Logo}\hspace*{4.75cm}~
%\includegraphics[height=0.1\textheight]{partner_logo_v2}
%}

\begin{document}

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

\begin{frame}{Concept}
    \begin{center}
        \includegraphics[width=0.6\textwidth]{diagram.pdf}
    \end{center}
    \begin{itemize}
        \item Double-ended readout: PMT end for energy and trigger, SiPM end for tracking
            \begin{itemize}
                \item Optional: use time difference to measure hit positions along fibers
            \end{itemize}
        \item Recoil neutron captured in a second, coarse-grained detector
    \end{itemize}
\end{frame}

\begin{frame}{Simulation}
    \begin{center}
        \includegraphics[width=0.3\textwidth]{10mev_neutron_isoview.png}
        \includegraphics[width=0.3\textwidth]{10mev_neutron_endview.png}
        \includegraphics[width=0.3\textwidth,page=2]{B4_250um_10mev_sideincidence_events.pdf}
    \end{center}
    \begin{itemize}
        \item Fibers and readout modeled in Geant4, will add scoring of the recoil particles
        \item 10 MeV incident neutron leaves good tracks (1 mm), 4-5 hits
        \item 5 MeV neutron makes shorter tracks (0.5 mm), 2-3 hits
    \end{itemize}
\end{frame}

\begin{frame}{Selling points, next steps}
    \begin{itemize}
        \item This system will measure event-by-event neutron energy and direction
            \begin{itemize}
                \item Nobody has done event-by-event neutron reconstruction (TPC plus second detector, or He-3 TPC, could do it)
            \end{itemize}
        \item Compact and rugged compared to the state of the art (TPCs, liquid scintillators)
        \item Multiplexed readout is scalable even with very large numbers of fibers
        \item LDRD ER preproposal?
        \item Simulation: estimate efficiency and pointing resolution
        \item Prototype: bundle of 20x20 fibers (5x5 mm$^2$) and a single 16-ch SiPM
            \begin{itemize}
                \item Alpha source: test proton energy measurement and tracking
                \item Neutron source: full system test at very small scale
                \item Gamma source: test gamma rejection (fibers should be blind to gammas)
            \end{itemize}
    \end{itemize}
\end{frame}

%\begin{frame}{Fix vertex fit}
%\begin{columns}
%\column{0.6\textwidth}
%\begin{itemize}
%\item The resolution of the reconstructed mass should be independent of Z but is worse for displaced vertices.
%\item This ad-hoc correction works pretty well: corrM = uncM - 0.15e-3*(elePX/eleP-posPX/posP)*uncVZ/uncM
%\item Hunch: the vertex mass is being calculated using the track directions at $z=0$, or something like that.
%\end{itemize}
%\begin{center}
%\includegraphics[width=\textwidth]{mass_shift_40}
%\end{center}
%\column{0.4\textwidth}
%\includegraphics[width=\textwidth,page=4]{acceptance_40}
%
%\includegraphics[width=\textwidth,page=5]{acceptance_40}
%\end{columns}
%\end{frame}

\end{document}
