\relax \global\@namedef{n@author@}{12} \global\@namedef{n@collab@}{0} \citation{lawrence1} \@writefile{toc}{\contentsline {section}{\numberline {1}Background}{2}} \newlabel{sec:background}{{1}{2}} \citation{lawrence2} \citation{dzierba} \citation{semenov1} \@writefile{toc}{\contentsline {section}{\numberline {2}Improvements due to the additional layer}{3}} \newlabel{sec:improvements}{{2}{3}} \citation{semenov2} \@writefile{toc}{\contentsline {section}{\numberline {3}Cost}{4}} \newlabel{sec:cost}{{3}{4}} \citation{kloe} \bibcite{lawrence1}{1} \@writefile{toc}{\contentsline {section}{\numberline {4}The KLOE Experience}{5}} \newlabel{sec:kloe}{{4}{5}} \@writefile{toc}{\contentsline {section}{\numberline {5}Margins/Contingency}{5}} \newlabel{sec:margins}{{5}{5}} \@writefile{toc}{\contentsline {section}{\numberline {6}Recommendation}{5}} \newlabel{sec:recommendations}{{6}{5}} \bibcite{lawrence2}{2} \bibcite{dzierba}{3} \bibcite{semenov1}{4} \bibcite{semenov2}{5} \bibcite{kloe}{6} \@writefile{toc}{\contentsline {section}{References}{6}} \citation{lawrence2} \citation{dzierba} \@writefile{toc}{\contentsline {section}{\numberline {7}Appendix}{7}} \@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces This figure shows the percent improvement in the average time and time difference resolution of the {\sc BCAL}\ in going from the 3-3-4 to the 1-2-3-4 segmentation\nobreakspace {}\cite {lawrence2}. The simulation at 90$^\circ $ shows that the two segmentations offer similar resolution; these points were not shown for ease of scaling the graph. As noted above, the region below 30$^\circ $ is vital for the investigation of exotics. }}{7}} \newlabel{fig:tres}{{1}{7}} \@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces This scatterplot\nobreakspace {}\cite {dzierba} shows the energy versus angle for the lowest energy photon in the event for $\gamma p \rightarrow b_1 \pi ^0 n$. The region below 30$^\circ $ is vital for the investigation of exotics, and here the energies of the photon span a great range. This scatterplot demonstrates the challenge for this lowest energy photon reconstruction: a large number of the low energy photons occur near the edge of the {\sc BCAL}. }}{7}} \newlabel{fig:b1pi}{{2}{7}} \@writefile{lof}{\contentsline {figure}{\numberline {3}{\ignorespaces These plots show the the suppression of neutrons for a fixed angle (20$^\circ $). This was calculated from a probability hypothesis, which is based on mono-energetic photons and all neutrons that deposit the same energy in the entire module. Two energies were studied, 0.45\nobreakspace {}GeV and 1\nobreakspace {}GeV. Note that two segmentations are equivalent in the 90\%-100\% photon efficiency range, but diverge quickly below that. The gain in going to the 1-2-3-4 segmentation is evident in comparing the neutron efficiencies, for data subsets, e.g. in the 50-90\% efficiency range. Such subsets are very useful in tuning the analysis code and establishing the confidence in exotic extraction. }}{8}} \newlabel{fig:neutrons}{{3}{8}} \@writefile{lof}{\contentsline {figure}{\numberline {4}{\ignorespaces We have studied the identification of pions and protons from the reaction $\gamma p \rightarrow \pi _1(1600) \mskip \medmuskip n \rightarrow b_1 \pi ^+ p$, with secondary decay products. The particle identification for protons and pions is shown for the 1-2-3-4 segmentation in the top panel; the 3-3-4 segmentation looks qualitatively similar. Projected slices in momentum from both plots were taken and fitted, as shown in the left panel of the bottom row. A comparison of these fits is shown in the bottom-right plot, demonstrating that the $\pi ^+ \delta \beta $ resolution improves by about 18\% in the momentum region where the bands of the protons and positive pions begin to merge. Ê In the simulation it was assumed that the charged-particle timing resolution improvement for the 1-2-3-4 segmentation is identical to that of photon clusters. No background events were included.}}{9}} \newlabel{fig:protons}{{4}{9}} \@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces This table shows the cost to instrument the innermost ring of the {\sc BCAL}.}}{10}} \newlabel{tab:cost}{{1}{10}} \global\c@lastpage=10