\begin{slide}{}

{\Large V. \underline{MWPC System \& Tracking}}\\
\begin{center}
\underline{Chamber Specifications}\\
\end{center}
\begin{enumerate}
\item Chambers Built at CWRU:
\begin{itemize}
\item 128 Wires/Chamber
\item 2.54 mm Pitch
\item Gas: 80\% Argon, 20\% $CO_{2}$
\end{itemize} 

\item Readout:
\begin{itemize}
\item 50\% Michigan, Custom-Built(Old);\\
Pulse-Heights Recorded
\item 50\% Fermilab(Nanometrics);\\
Latch Only
\end{itemize}
\end{enumerate}

\vfill\eject 

\begin{center}
\underline{Chamber Performance}\\
\end{center}
\begin{enumerate}
\item High Occupancies:
\begin{itemize}
\item 5\%-30\% per Wire
\item Hit-Density/Area is:
\begin{itemize}
\item Proportional to Distance\\
from Luminous Region
\item Inversely Proportional\\
to Distance from Beam Axis
\end{itemize}
\end{itemize} 
\item High ($> 95 \%$) Wire Efficiencies
\item Alignments Good to $\sim 300 \, \mu$
\end{enumerate}
\vfill\eject

\begin{center}
\underline{Chamber Orientations}\\
\end{center}
\begin{enumerate}
\item Large-Angle Stereo Used in Early Runs:
\begin{itemize}
\item $75^{o}$ Rotation Plane-to-Plane
\item Good Resolution
\item No Ghost Tracks
\item Poorer Performance\\
at High Occupancies\\
(Inferior Pattern Recognition)
\end{itemize}
\vfill\eject 

\underline{Chamber Orientations(Continued)}\\
\item Small-Angle Stereo Used in Late Runs:\\
 (Thanks to:\\
 H. Albrecht \& W. Hoffmann, HERA-B)
\begin{itemize}
\item Small-Angle Only ($\pm 5-10^{o}$)\\
for the 16 Planes Behind Pb
\item Large-Angle\\
for the Front 8 Planes
\item Pattern-Recognition Much Improved
\item Poorer Resolution in Stereo View
\end{itemize}
\end{enumerate}
\vfill\eject


\begin{center}
\underline{Tracking}\\
\end{center}
\begin{enumerate}
\item Track-Finding Algorithms:
\begin{itemize}
\item Two Different Combinatorial Trackers Used
\item Track-Following Algorithms\\
Under Development
\end{itemize} 
\item Strategy:
\begin{itemize}
\item Separate Track Segments Constructed\\
in Front-8 and Back-16 Chambers
\item Match of Tracks at Pb Converter
\item Track-Finding Efficiency Good\\
for Mean Occupancy $\leq 20 \%$\\
(95-99\% of the Data Set)
\end{itemize}
\vfill\eject


\underline{Tracking(Continued)}\\ 
\item Gamma-Finding:
\begin{itemize}
\item Many Algorithms to Try
\item Present Definition:\\
At Least One Track Originating in Pb\\
that Points Toward Luminous Region
\end{itemize}
\end{enumerate}
\vfill\eject

\begin{center}
{\Large \underline{Simulations}}\\
\end{center}
\begin{itemize}
\item PYTHIA: Generic Event Generator
\item DCC Event Generator Exists\\
($\sim$ T-864 Definition of DCC)
\item GEANT Implemented:\\
Includes Main Sources of Background\\
(Floor, Beampipes, Apparatus, etc.)
\item Simulation of Occupancy Distribution:\\
Agrees Well for Old Beampipe
\item Simulation Underestimates\\
Distributions for New Beampipe:\\
Not Understood
\item Simulations Used to Estimate\\
Track and Gamma-Finding Efficiencies
\end{itemize}


\end{slide}{}