\contentsline {figure}{\numberline {1}{\ignorespaces \relax \fontsize {10}{12}\selectfont \abovedisplayskip 10\p@ plus2\p@ minus5\p@ \abovedisplayshortskip \z@ plus3\p@ \belowdisplayshortskip 6\p@ plus3\p@ minus3\p@ \def \leftmargin \leftmargini \parsep 4.5\p@ plus2\p@ minus\p@ \topsep 9\p@ plus3\p@ minus5\p@ \itemsep 4.5\p@ plus2\p@ minus\p@ {\leftmargin \leftmargini \topsep 6\p@ plus2\p@ minus2\p@ \parsep 3\p@ plus2\p@ minus\p@ \itemsep \parsep }\belowdisplayskip \abovedisplayskip {CAD drawing of the BigBite auxiliary plane. }}}{10}
\contentsline {figure}{\numberline {2}{\ignorespaces \relax \fontsize {10}{12}\selectfont \abovedisplayskip 10\p@ plus2\p@ minus5\p@ \abovedisplayshortskip \z@ plus3\p@ \belowdisplayshortskip 6\p@ plus3\p@ minus3\p@ \def \leftmargin \leftmargini \parsep 4.5\p@ plus2\p@ minus\p@ \topsep 9\p@ plus3\p@ minus5\p@ \itemsep 4.5\p@ plus2\p@ minus\p@ {\leftmargin \leftmargini \topsep 6\p@ plus2\p@ minus2\p@ \parsep 3\p@ plus2\p@ minus\p@ \itemsep \parsep }\belowdisplayskip \abovedisplayskip {Photo of the auxiliary plane during its construction}. }}{10}
\contentsline {figure}{\numberline {3}{\ignorespaces \relax \fontsize {10}{12}\selectfont \abovedisplayskip 10\p@ plus2\p@ minus5\p@ \abovedisplayshortskip \z@ plus3\p@ \belowdisplayshortskip 6\p@ plus3\p@ minus3\p@ \def \leftmargin \leftmargini \parsep 4.5\p@ plus2\p@ minus\p@ \topsep 9\p@ plus3\p@ minus5\p@ \itemsep 4.5\p@ plus2\p@ minus\p@ {\leftmargin \leftmargini \topsep 6\p@ plus2\p@ minus2\p@ \parsep 3\p@ plus2\p@ minus\p@ \itemsep \parsep }\belowdisplayskip \abovedisplayskip {CAD drawing of the BigBite trigger plane. }}}{11}
\contentsline {figure}{\numberline {4}{\ignorespaces \relax \fontsize {10}{12}\selectfont \abovedisplayskip 10\p@ plus2\p@ minus5\p@ \abovedisplayshortskip \z@ plus3\p@ \belowdisplayshortskip 6\p@ plus3\p@ minus3\p@ \def \leftmargin \leftmargini \parsep 4.5\p@ plus2\p@ minus\p@ \topsep 9\p@ plus3\p@ minus5\p@ \itemsep 4.5\p@ plus2\p@ minus\p@ {\leftmargin \leftmargini \topsep 6\p@ plus2\p@ minus2\p@ \parsep 3\p@ plus2\p@ minus\p@ \itemsep \parsep }\belowdisplayskip \abovedisplayskip {Photo of the trigger plane during its construction}. }}{11}
\contentsline {figure}{\numberline {5}{\ignorespaces Shown is a CAD drawing of how the short-range correlation experiment will look, once it is installed in Hall A. Located left of center is the new scattering chamber which will match BigBite's large out-of-plane acceptance. The stand for the spectrometer mounts under the target platform and to a curved track located on the floor. The BigBite dipole magnet is shown in yellow and blue. Behind the magnet are the auxiliary and trigger planes. Behind the CAD person is a neutron detector which will also be used during the experiment.}}{12}
\contentsline {figure}{\numberline {6}{\ignorespaces Helicity Pair-Sync (PS) signal (bottom trace) added to the G0 helicity scheme for compatibility with the Compton Polarimeter.}}{16}
\contentsline {figure}{\numberline {7}{\ignorespaces Singles rates in the four planes of the electron detector as a function of micro-strip number. }}{17}
\contentsline {figure}{\numberline {8}{\ignorespaces Coincidence rates in the four planes of the electron detector as a function of micro-strip number. }}{17}
\contentsline {figure}{\numberline {9}{\ignorespaces Preliminary beam polarization measurement performed at 2.8 GeV between June 31 and August 05, 2003. Blue points are results of the coincidence analysis, red points are electron only. Only statistical errors are presented.}}{19}
\contentsline {figure}{\numberline {10}{\ignorespaces Preliminary layout of the $G_E^n$ neutron detector. The electronics schematic is also shown.}}{24}
\contentsline {figure}{\numberline {11}{\ignorespaces The control of the charge asymmetry and the convergence of the average charge asymmetry during a run from tests in June, 2002 demonstrate the effectiveness of feedback using the IA cell. }}{30}
\contentsline {figure}{\numberline {12}{\ignorespaces Time dependence of the charge asymmetry across the 33 ms helicity-flipping window.}}{32}
\contentsline {figure}{\numberline {13}{\ignorespaces The charge asymmetry distribution displays multiple peaks caused by the history of pair ordering in previous pairs. }}{32}
\contentsline {figure}{\numberline {14}{\ignorespaces The two-segment HAPPEX detector.}}{34}
\contentsline {figure}{\numberline {15}{\ignorespaces Distribution of the number of photo-electrons and of the charge per cluster for the cosmic tests in August 2003. The MWPC was operated at 2150\nobreakspace {}V with pure methane. The average number of photo-electrons per ring was 10.6.}}{36}
\contentsline {figure}{\numberline {16}{\ignorespaces Distribution of the number of photo-electrons and of the charge per cluster for the cosmic tests in November 2003. The MWPC was operated at 2120\nobreakspace {}V with pure methane. The average number of photo-electrons per ring was 13.4.}}{36}
\contentsline {figure}{\numberline {17}{\ignorespaces The event display for a single cosmic trigger. The large cluster in the middle is the signal from a MIP, the clusters around it are from the Cherenkov light.}}{37}
\contentsline {figure}{\numberline {18}{\ignorespaces The fully assembled S2m scintillator plane.}}{38}
\contentsline {figure}{\numberline {19}{\ignorespaces S2m Time-difference resolution.}}{39}
\contentsline {figure}{\numberline {20}{\ignorespaces Results for the reconstructed target quantities $\delta $ (momentum), $y$ (in-plane position), $\theta $ (out-of-plane angle), and $\phi $ (in-plane angle). The data are from an optics study that used a 9-foil carbon target and the sieve slit collimator on the left HRS (see text). In each panel, black histograms represent results from the C++ analyzer, and red (lighter colored) histograms were obtained with ESPACE. Since the results are nearly identical, the two histograms are almost indistinguishable.}}{42}
\contentsline {figure}{\numberline {21}{\ignorespaces Histograms of the event-by-event differences of the target variables reconstructed by the C++ analyzer and by ESPACE. The data are the same as in Fig.\nobreakspace {}{20\hbox {}}. The widths of the distributions are about an order of magnitude smaller than the measured spectrometer resolutions for each variable. }}{43}
\contentsline {figure}{\numberline {22}{\ignorespaces Example of a good track in the HRS visualized by the prototype event display of the C++ analyzer. Wire chamber clusters as well as active scintillator paddles and shower blocks are shown. The track is drawn using the reconstructed focal plane coordinates from the VDC.}}{44}
\contentsline {figure}{\numberline {23}{\ignorespaces Sample of the 3-body break-up data\nobreakspace {}\cite {Ben03} for several recoil momenta. Theoretical calculations are shown for different approximations of the (e,e$'$p) reaction process. The green dashed line indicates the expected position of the maximum of the cross section assuming a correlated pair in the nucleus.}}{47}
\contentsline {figure}{\numberline {24}{\ignorespaces Very high recoil momentum distribution in $^3$He; triangle and dot symbols are $^3$He(e,e$'$p)d analysis results\nobreakspace {}\cite {Rva03} and the star symbol of the last point is the reconstructed cross section from the $^3$He(e,e$'$d)p measurement.}}{48}
\contentsline {figure}{\numberline {25}{\ignorespaces Data for response functions at $W = 1.22 \pm 0.02$ GeV and $Q^2 = 0.9 \pm 0.1$ (GeV/$c$)$^2$ are compared with Legendre fits in the $sp$ truncation (dashed) and with a few extra terms as needed (solid). Results from CLAS are shown as green squares for $k_i = 1.645$ GeV or blue open circles for $k_i = 2.445$ GeV.}}{50}
\contentsline {figure}{\numberline {26}{\ignorespaces Data for response functions at $W = 1.22 \pm 0.02$ GeV and $Q^2 = 0.9 \pm 0.1$ (GeV/$c$)$^2$ are compared with fits that vary $sp$ (dashed) versus $spd$ (solid) multipole amplitudes. Results from CLAS are shown as green squares for $k_i = 1.645$ GeV or blue open circles for $k_i = 2.445$ GeV.}}{52}
\contentsline {figure}{\numberline {27}{\ignorespaces EMR and SMR data for $Q^2=0.3$ (GeV/$c$)$^2$ are compared with MAID2000 (solid), DMT (dashed), and SAID (dash-dot). In addition, the red star shows the result for $W=1.23 \pm 0.02$ GeV, $Q^2=1.0 \pm 0.2$ (GeV/c)$^2$. Left: results from truncated Legendre expansion. Right: results from multipole analysis varying $sp$ amplitudes w.r.t. MAID2000. Within each panel data and curves employ the same formulas.}}{53}
\contentsline {figure}{\numberline {28}{\ignorespaces Cross section ratio $H(e,e'p)\gamma / H(e,e'p)\pi ^0$, at $Q^2=1.0$ GeV$^2$ in a bin $\mathop {\mathgroup \symoperators cos}\nolimits \theta _{\gamma p}^{CM} > 0.95$, where $\theta _{\gamma p}^{CM}$ is the angle between the recoil proton and the virtual photon $q$ in the photon-proton Center-of-Mass frame.}}{55}
\contentsline {figure}{\numberline {29}{\ignorespaces Comparison of $Q^2=1$ GeV$^2$ virtual compton scattering cross sections ($\bullet $) at $\theta _{\gamma \gamma }^{CM}=167^\circ $ and real compton scattering data at $\theta _{\gamma \gamma }^{CM}=159-160^\circ $ \cite {Wada:sh} ($\star $) $128-132^\circ $ \cite {Jung:1981wm} ($\diamond $), $141^\circ $ \cite {Hallin:1993ft} ($\bigtriangleup $), $130-132^\circ $ \cite {Ishii:ei} ($\circ $), $131^\circ $ \cite {Wissmann:vi} (\hbox to 0pt{$\sqcap $}$\sqcup $), $128-105^\circ $ \cite {Shupe:vg} ($\times $). The solid curve is a $s^{-6}$ scaling function normalized to the second Cornell point. The dashed curve is the Bethe-Heitler + Born cross section including the $t$-channel $\pi ^0$ exchange diagram. The dotted curve is the Bethe-Heitler alone. }}{55}
\contentsline {figure}{\numberline {30}{\ignorespaces Preliminary results for $g_2^n$ from E97-103. Errors are statistical with systematic errors shown by the solid band. Also shown are calculations of $g_2^{ww}$ using the Blumlein and Bottcher NLO fit to world data on $g_1$.}}{57}
\contentsline {figure}{\numberline {31}{\ignorespaces Kinematical coverage of the experiment.}}{60}
\contentsline {figure}{\numberline {32}{\ignorespaces Elastic asymmetry online results for run 1.}}{61}
\contentsline {figure}{\numberline {33}{\ignorespaces Elastic asymmetry online results for run 2.}}{61}
\contentsline {figure}{\numberline {34}{\ignorespaces Optics data from run 2}}{62}
\contentsline {figure}{\numberline {35}{\ignorespaces $Q^2$-position of the expected results with their uncertainty}}{62}
\contentsline {figure}{\numberline {36}{\ignorespaces Preliminary results for the reduced cross sections at a beam energy of 3170\nobreakspace {}MeV. The error bars only show the statistical uncertainty. The dashed line (short dashes) shows the theoretical prediction by Laget in PWIA, the solid line depicts the full calculation, the dotted line only includes FSI. The dashed curve (long dashes) is a Glauber calculation by Ciofi and Morita, the dash-dotted curve additionally includes finite formation time effects.}}{64}
\contentsline {figure}{\numberline {37}{\ignorespaces The online missing mass yield taken in March 2002 at $Q^2 = 1.9$ (GeV/c)$^2$, $W= 1.95$ GeV and $t=t_{min}$. }}{66}
\contentsline {figure}{\numberline {38}{\ignorespaces The longitudinal (upper) and transverse (lower) response function at $Q^2$- 2.35 $GeV/c^2$ for $H(e,e^{\prime }K^+)$ as a function of the invariant 4-momentum, {\it t}. }}{67}
\contentsline {figure}{\numberline {39}{\ignorespaces Shown are ratios of the longitudinal to transverse responses as a function of $Q^2$ from the previous E93-018 and from this experiment. }}{68}
\contentsline {figure}{\numberline {40}{\ignorespaces Preliminary $H(\gamma ,\gamma p)$ cross sections, divided by the elementary Klein-Nishina cross section, as a function of the invariant momentum transfer $t$.}}{70}
\contentsline {figure}{\numberline {41}{\ignorespaces Preliminary fixed-angle scaling exponent (Eq.\nobreakspace {}5\hbox {}). The Cornell data are from \cite {Shupe:vg}. The curve from A. Radyushkin is a prediction of the handbag hypothesis.}}{71}
\contentsline {figure}{\numberline {42}{\ignorespaces Projected $ A_{LT}$ data compared to E89-003 results and calculations of Udias \emph {et al}. Open circles are anticipated data points from E00-102, solid squares are E89-003 data obtained at slightly different kinematics.}}{73}
\contentsline {figure}{\numberline {43}{\ignorespaces E00-102 kinematics. LHRS remained fixed at 12.5$ ^{\circ }$ throughout the experiment while RHRS varied around the direction of parallel kinematics.}}{73}
\contentsline {figure}{\numberline {44}{\ignorespaces The ($Q^2,\varepsilon $) points at which proton spectra were taken. The lines are fixed values of beam energy: 1.912 (red), 2.262 (black), 2.842 (green), 3.772 (blue), and 4.702 GeV (magenta). The $Q^2 = 0.50$\nobreakspace {}GeV$^2$ points served to monitor the luminosity.}}{75}
\contentsline {figure}{\numberline {45}{\ignorespaces Missing momentum spectrum (in MeV) at $E_{beam} = 2.262$\nobreakspace {}GeV, $\theta _p = 12.526^\circ $ ($Q^2 = 3.20$\nobreakspace {}GeV$^2$, $\varepsilon = 0.131$). The data from the LH2 target is shown in black, while the total simulated spectrum is in red. The spectrum is decomposed into contributions from the elastic peak (blue), protons from the $\gamma + p \rightarrow \pi ^0 + p$ reaction (green) and protons coming from the solid endcaps of the target (magenta).}}{76}
\contentsline {figure}{\numberline {46}{\ignorespaces Reduced cross sections plotted as a function of $\varepsilon $. The solid line is the best linear fit to the data and the dotted line is the best fit with the slope fixed to match the results of the polarization transfer experiments\nobreakspace {}\cite {jones00,gayou02}.}}{78}