\contentsline {chapter}{\numberline {4}Photon Beam}{2}
\contentsline {section}{\numberline {4.1}Choice of technique}{3}
\contentsline {subsection}{\numberline {4.1.1}Compton back-scatter}{4}
\contentsline {subsection}{\numberline {4.1.2}Tagged bremsstrahlung}{6}
\contentsline {subsection}{\numberline {4.1.3}Coherent bremsstrahlung}{7}
\contentsline {section}{\numberline {4.2}Photon source}{8}
\contentsline {subsection}{\numberline {4.2.1}Essential features}{10}
\contentsline {subsection}{\numberline {4.2.2}Use of collimation}{12}
\contentsline {subsection}{\numberline {4.2.3}Choice of radiator}{19}
\contentsline {subsection}{\numberline {4.2.4}Crystal quality}{21}
\contentsline {subsection}{\numberline {4.2.5}Crystal thickness}{25}
\contentsline {subsection}{\numberline {4.2.6}Crystal mount}{28}
\contentsline {subsection}{\numberline {4.2.7}Crystal alignment and monitoring}{30}
\contentsline {subsection}{\numberline {4.2.8}Crystal lifetime}{31}
\contentsline {section}{\numberline {4.3}Electron beam}{33}
\contentsline {subsection}{\numberline {4.3.1}Beam polarization}{35}
\contentsline {subsection}{\numberline {4.3.2}Beam emittance}{36}
\contentsline {subsection}{\numberline {4.3.3}Electron beam line optics}{38}
\contentsline {subsection}{\numberline {4.3.4}Electron beam dump}{41}
\contentsline {subsection}{\numberline {4.3.5}Beam containment and shielding}{41}
\contentsline {section}{\numberline {4.4}Tagging spectrometer}{42}
\contentsline {subsection}{\numberline {4.4.1}Specifications}{42}
\contentsline {subsection}{\numberline {4.4.2}Magnet}{43}
\contentsline {subsection}{\numberline {4.4.3}Spectrometer Optics}{48}
\contentsline {subsection}{\numberline {4.4.4}Tagger detectors}{50}
\contentsline {subsubsection}{Fixed focal plane array}{50}
\contentsline {subsubsection}{Focal plane microscope detectors}{52}
\contentsline {subsection}{\numberline {4.4.5}Beam dump optics}{53}
\contentsline {section}{\numberline {4.5}Polarimetry instrumentation}{53}
\contentsline {section}{\numberline {4.6}Operating beam intensity}{55}