\contentsline {figure}{\numberline {1}{\ignorespaces A photo of the prototype Pavelometer.}}{13}{figure.1}
\contentsline {figure}{\numberline {2}{\ignorespaces Data from the Hall C Pavelometer, comparing the X,Y beam position as measured with the dump viewer {[}green{]} with that as measured by the Pavelometer {[}red{]}. }}{14}{figure.2}
\contentsline {figure}{\numberline {3}{\ignorespaces Cartoon schematic of the synchrotron light interferometer. }}{15}{figure.3}
\contentsline {figure}{\numberline {4}{\ignorespaces Control screen for the SLI showing the horizontal and vertical interferograms. The beam-size values above the interferogram are the result of a simple search algorithm to determine $I_{max}$ and $I_{min}$. The values below the interferogram result from a fit to the expected functional form.}}{15}{figure.4}
\contentsline {figure}{\numberline {5}{\ignorespaces Plot of the beam width as measured by the SLI vs. OTR. The green dashed curve is a line with slope of one and intercept of zero. }}{16}{figure.5}
\contentsline {figure}{\numberline {6}{\ignorespaces He target density fluctuations; the RMS width (in ppm) of the helicity-pairs measured in the luminosity monitors is shown as a function of beam current in $\mu $A. Data were taken with 48 Hz target fan speed. Below 20 $\mu $A the data obey counting statistics, falling as $I^{-1/2}$; above that the widths increase again indicating density fluctuations. }}{21}{figure.6}
\contentsline {figure}{\numberline {7}{\ignorespaces The distribution of time-differences between the left and right PMTs on the upper eight paddles of S2 on the HRS-R, after correcting for the signal propagation through the scintillator. The other paddles were similar.}}{23}{figure.7}
\contentsline {figure}{\numberline {8}{\ignorespaces The distribution of coincidence-times between the left and right HRS spectrometers for $(e,e' \pi ^+)$ events. The beam's intrinsic microstructure is visible in the peaks every 2\nobreakspace {}ns from accidental coincidences.}}{24}{figure.8}
\contentsline {figure}{\numberline {9}{\ignorespaces Schematic layout of the Hall A Compton polarimeter.}}{25}{figure.9}
\contentsline {figure}{\numberline {10}{\ignorespaces Typical Compton spectrum in the central crystal of the photon calorimeter and signal-to-background ratio during DVCS runs at 5.75 GeV.}}{27}{figure.10}
\contentsline {figure}{\numberline {11}{\ignorespaces Singles counting rates in the four planes of the electron detector as a function of micro-strip number during DVCS runs at 5.75 GeV. The green points are with the cavity on (Compton events) and the red points are with cavity off (background events). }}{28}{figure.11}
\contentsline {figure}{\numberline {12}{\ignorespaces Beam polarization measurement performed at 3 GeV for the HAPPEx-Helium run. Blue points are results of the coincidence analysis, red points are electron-only.}}{29}{figure.12}
\contentsline {figure}{\numberline {13}{\ignorespaces Beam-polarization measurement performed at 3 GeV for the HAPPEx-Hydrogen run. Blue points are results of the coincidence analysis, red points are electron-only.}}{30}{figure.13}
\contentsline {figure}{\numberline {14}{\ignorespaces Preliminary beam polarization measurement taken during the Hall A DVCS experiments performed at 5.75 GeV. The results are for electron-photon coincidence analysis. Only statistical errors are represented}}{30}{figure.14}
\contentsline {figure}{\numberline {15}{\ignorespaces Lay-out of the optics table for the green Compton polarimeter.}}{33}{figure.15}
\contentsline {figure}{\numberline {16}{\ignorespaces Expected performances of the integrated and energy-weighted method with the upgraded polarimeter. The beam energy is fixed at 850 MeV.}}{34}{figure.16}
\contentsline {figure}{\numberline {17}{\ignorespaces The BigBite spectrometer stand. The stand makes use of custom rollers that allow the system to easily rotate along a track located on the floor and the top of the central hub.}}{37}{figure.17}
\contentsline {figure}{\numberline {18}{\ignorespaces A CAD drawing and a photo of the BigBite detector package for the SRC experiment.}}{38}{figure.18}
\contentsline {figure}{\numberline {19}{\ignorespaces The BigBite scattering chamber while it was under construction (left) and the chamber during its JLab pressure test (right).}}{39}{figure.19}
\contentsline {figure}{\numberline {20}{\ignorespaces The short-range correlation experiment as installed in Hall A. Located left of center is the new scattering chamber which matches BigBite's large out-of-plane acceptance. The BigBite dipole magnet is located right of the chamber with the auxiliary and trigger planes mounted behind.}}{40}{figure.20}
\contentsline {figure}{\numberline {21}{\ignorespaces Calculated response of the BPM electronics to the triangle raster wave form. The top figure shows the amplitude vs time for the 30 kHz low-bandpass frequency response that we have. This is compared to an infinite-bandpass response. The bottom figure shows the amplitude distribution that would be observed, e.g. with the online program raster++. It is also compared to the infinite-bandpass result.}}{42}{figure.21}
\contentsline {figure}{\numberline {22}{\ignorespaces Drawing of the forward-angle lumi and the exit beam pipe.}}{46}{figure.22}
\contentsline {figure}{\numberline {23}{\ignorespaces Picture of the inside of the exit beam pipe showing the 8 cups where the lumi detectors were put in.}}{46}{figure.23}
\contentsline {figure}{\numberline {24}{\ignorespaces The lumi widths versus beam current during a hydrogen run in summer 2004.}}{47}{figure.24}
\contentsline {figure}{\numberline {25}{\ignorespaces The lumi widths versus the target fan speed during a hydrogen run in summer 2004.}}{47}{figure.25}
\contentsline {figure}{\numberline {26}{\ignorespaces World data on the neutron electric from factor with planned values of Q$^2$ in E02-013 and expected accuracy of results.}}{48}{figure.26}
\contentsline {figure}{\numberline {27}{\ignorespaces Schematic layout of experiment E02-013. }}{49}{figure.27}
\contentsline {figure}{\numberline {28}{\ignorespaces Magnet for the polarized target.}}{50}{figure.28}
\contentsline {figure}{\numberline {29}{\ignorespaces A hybrid (K+Rb) cell with $^3$He}}{51}{figure.29}
\contentsline {figure}{\numberline {30}{\ignorespaces A prototype high-temperature oven.}}{52}{figure.30}
\contentsline {figure}{\numberline {31}{\ignorespaces BigBite detector frame with the first drift chamber installed.}}{52}{figure.31}
\contentsline {figure}{\numberline {32}{\ignorespaces The neutron bars in the cassettes.}}{53}{figure.32}
\contentsline {figure}{\numberline {33}{\ignorespaces The veto paddles in the cassette.}}{53}{figure.33}
\contentsline {figure}{\numberline {34}{\ignorespaces Pseudo-data for response functions at $W = 1.23 \pm 0.01$ GeV and $Q^2 = 1.0 \pm 0.2$ GeV$^2$ are compared with the input model (MAID2000) at the central kinematics and neighboring values of $Q^2$ representative of the $x$ dependence of acceptance averaging. See text for details.}}{56}{figure.34}
\contentsline {figure}{\numberline {35}{\ignorespaces Response functions at $W = 1.23$ GeV are compared with recent models and with fits. The units are $\mu $b. The labeling distinguishes L, T, LT, and TT contributions to the unpolarized (0) cross section and to transverse (t), normal (n), or longitudinal (l) components of recoil polarization with an h to indicate helicity dependence, if any. Linear combinations that cannot be resolved without Rosenbluth separation are identified by L+T. Black dash-dotted, dotted, short-dashed, and long-dashed curves represent the MAID, DMT, SAID and SL models, respectively. The green mid-dashed curves show a Legendre fit while the solid red curves show a multipole fit.}}{57}{figure.35}
\contentsline {figure}{\numberline {36}{\ignorespaces Fitted $1+$ multipole amplitudes are compared with MAID2003 (red solid), DMT (green dashed) , SAID (blue dash-dot), and SL (cyan dotted) models. Black short-dashed curves show Born baseline amplitudes.}}{58}{figure.36}
\contentsline {figure}{\numberline {37}{\ignorespaces Fitted $0+$ and $1-$ multipole amplitudes are compared with MAID2003 (red solid), DMT (green dashed) , SAID (blue dash-dot), and SL (cyan dotted) models. Black short-dashed curves show Born baseline amplitudes.}}{58}{figure.37}
\contentsline {figure}{\numberline {38}{\ignorespaces PID with threshold aerogel \v Cerenkov counters.}}{61}{figure.38}
\contentsline {figure}{\numberline {39}{\ignorespaces Hypernuclear spectra of $ ^{12}$C and $ ^{9}$Be with and without RICH.}}{62}{figure.39}
\contentsline {figure}{\numberline {40}{\ignorespaces RICH scheme and event display.}}{63}{figure.40}
\contentsline {figure}{\numberline {41}{\ignorespaces The role of the RICH for kaon identification: many pions and protons are still present if RICH cuts are not applied.}}{64}{figure.41}
\contentsline {figure}{\numberline {42}{\ignorespaces RICH performance. On the left side the number of photoelectrons for pions and protons is shown. On the right side the distribution of the \v Cerenkov angle reconstruction is reported, showing a resolution of 5 mrad.}}{65}{figure.42}
\contentsline {figure}{\numberline {43}{\ignorespaces $ ^{9}$Li$_{\Lambda }$ missing-energy spectrum with and without the RICH selection.}}{66}{figure.43}
\contentsline {figure}{\numberline {44}{\ignorespaces Left: $ ^{12}$B$_{\Lambda }$ missing-energy spectrum, the solid and dashed lines represent the theoretical data (see text). Right: $ ^{9}$Be$_{\Lambda }$ missing-energy spectrum, the solid and dashed lines represent the theoretical data (see text).}}{66}{figure.44}
\contentsline {figure}{\numberline {45}{\ignorespaces Sieve-slit data of $x_{sieve}$ vs $\phi _{tg}$ for the central foil at 2.24 GeV and 9$^\circ $ with $dp/p=3\%$. The line crossings are the expected positions of the sieve holes. }}{69}{figure.45}
\contentsline {figure}{\numberline {46}{\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 shows the theoretical prediction by Laget in PWIA, the dotted line includes FSI, and the solid line depicts the full calculation.}}{71}{figure.46}
\contentsline {figure}{\numberline {47}{\ignorespaces Our result for $K_{LL}$ compared with calculations in different approaches: ASY and COZ both from pQCD \cite {br00}, GPD \cite {hu04}, extended Regge model \cite {ca03}, and CQM \cite {mi04}. The curve labeled KN is $K_{_{LL}}^{^{KN}}$, the Klein-Nishina asymmetry for a structureless proton. }}{74}{figure.47}
\contentsline {figure}{\numberline {48}{\ignorespaces Extracted RCS form factor $R_{V}$, the solid line is a calculation \cite {DIEHLWCS}. }}{75}{figure.48}
\contentsline {figure}{\numberline {49}{\ignorespaces Overview of the HAPPEx-II experiment.}}{78}{figure.49}
\contentsline {figure}{\numberline {50}{\ignorespaces Preliminary HAPPEx-H and HAPPEx-He results from the 2004 run, with results from PVA4 \cite {PVA4} and SAMPLE \cite {SAMPLE}. The three ellipses correspond to contours at the 68\%, 90\% and 99\% confidence level.}}{79}{figure.50}
\contentsline {figure}{\numberline {51}{\ignorespaces The FPP configuration in E00-007. }}{80}{figure.51}
\contentsline {figure}{\numberline {52}{\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.}}{84}{figure.52}
\contentsline {figure}{\numberline {53}{\ignorespaces E00-102 kinematics. HRS-L remained fixed at 12.5$ ^{\circ }$ throughout the experiment while HRS-R varied around the direction of parallel kinematics.}}{84}{figure.53}
\contentsline {figure}{\numberline {54}{\ignorespaces Left: H$(e,e'\gamma )X$ coincidence time spectrum for events with a 1 GeV cut in the calorimeter. Right: Electron-proton coincidence time spectrum for events with a true coincidence time cut on the H$(e,e'\gamma )X$ spectrum. The blue histogram labeled ``Mapped Events'' is obtained selecting only those blocks in the proton array that lie within a loose footprint of H$(e,e'\gamma p)$ events, as defined by the position of the photon shower in the calorimeter.}}{86}{figure.54}
\contentsline {figure}{\numberline {55}{\ignorespaces H$(e,e'\gamma )X$ missing-mass squared spectrum. }}{87}{figure.55}
\contentsline {figure}{\numberline {56}{\ignorespaces Missing momentum spectrum for the low $\varepsilon $ point at $Q^2 = 3.20$\nobreakspace {}GeV$^2$. The black circles indicate the data from the LH2 target while the red histogram indicates the total simulated spectrum. 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 Aluminum end caps of the target (magenta).}}{89}{figure.56}
\contentsline {figure}{\numberline {57}{\ignorespaces Reduced cross sections as a function of $\varepsilon $. The solid line is the best linear fit to the data, the dashed line gives the slope assuming $\mu G_E = G_M$, and the dotted line is the slope one obtains using the polarization transfer fit to $G_E/G_M$.}}{91}{figure.57}
\contentsline {figure}{\numberline {58}{\ignorespaces Extracted values of $\mu G_E/G_M$ from the present measurement (solid circles), a global analysis of previous Rosenbluth extractions (`$\times $')\nobreakspace {}\cite {arrington04}, and the polarization transfer measurements (triangles).}}{92}{figure.58}
\contentsline {figure}{\numberline {59}{\ignorespaces The $Q^2$ and $W$ coverage for E01-012}}{94}{figure.59}
\contentsline {figure}{\numberline {60}{\ignorespaces Preliminary results for $^3$He virtual photon asymmetry $A_1$ from E01-012. Radiative corrections and Nitrogen dilution corrections have not been applied.}}{94}{figure.60}
\contentsline {figure}{\numberline {61}{\ignorespaces Relative yield normalized to beam charge as a function of beam current for a nominal 2\nobreakspace {}mm $\times $ 2\nobreakspace {}mm raster size.}}{96}{figure.61}
\contentsline {figure}{\numberline {62}{\ignorespaces Relative yield normalized to beam charge as a function of beam current for a nominal 4mm $\times $ 4mm raster size.}}{96}{figure.62}
\contentsline {figure}{\numberline {63}{\ignorespaces Preliminary distributions {\it vs.} the neutron angle relative to $\mathaccent "017E\relax q\,$ normalized to a PWIA calculation. The curves are calculations from Laget based on a Glauber treatment of FSI.}}{97}{figure.63}
\contentsline {figure}{\numberline {64}{\ignorespaces Proposed antidecuplet symmetry group (Diakonov {\it et al.\/}\/ \cite {diakonov}).}}{99}{figure.64}
\contentsline {figure}{\numberline {65}{\ignorespaces Experimental setup for E04-012.}}{100}{figure.65}
\contentsline {figure}{\numberline {66}{\ignorespaces Performance of the hadron PID system for E04-012 (see text for details).}}{101}{figure.66}
\contentsline {figure}{\numberline {67}{\ignorespaces Neutron calibration spectrum (upper panel), illustrating the achieved missing-mass resolution, and mass calibration of the well-known $\Lambda $ and $\Sigma $ resonances (lower panel).}}{102}{figure.67}
\contentsline {figure}{\numberline {68}{\ignorespaces Preliminary missing-mass spectrum obtained in the $\Sigma ^\circ _{_{\overline {10}}}$ search. The upper and lower panels show a fit to the background and to a candidate peak, respectively, to illustrate the search technique. The broad structures across the region are known wide resonances. No statistically significant narrow peak has been observed in our preliminary analysis.}}{103}{figure.68}