\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}{9}
\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}{20}
\contentsline {subsection}{\numberline {4.2.4}Crystal quality}{23}
\contentsline {subsection}{\numberline {4.2.5}Crystal thickness}{29}
\contentsline {subsection}{\numberline {4.2.6}Crystal mount}{30}
\contentsline {subsection}{\numberline {4.2.7}Crystal alignment and monitoring}{33}
\contentsline {subsection}{\numberline {4.2.8}Crystal lifetime}{34}
\contentsline {section}{\numberline {4.3}Electron beam}{36}
\contentsline {subsection}{\numberline {4.3.1}Beam polarization}{37}
\contentsline {subsection}{\numberline {4.3.2}Beam emittance}{38}
\contentsline {subsection}{\numberline {4.3.3}Electron beam line optics}{41}
\contentsline {subsection}{\numberline {4.3.4}Electron beam dump}{44}
\contentsline {subsection}{\numberline {4.3.5}Beam containment and shielding}{44}
\contentsline {section}{\numberline {4.4}Tagging spectrometer}{46}
\contentsline {subsection}{\numberline {4.4.1}Specifications}{46}
\contentsline {subsection}{\numberline {4.4.2}Magnet}{48}
\contentsline {subsection}{\numberline {4.4.3}Spectrometer optics}{49}
\contentsline {subsection}{\numberline {4.4.4}Tagger detectors}{51}
\contentsline {subsubsection}{Focal plane microscope detectors}{51}
\contentsline {subsubsection}{Fixed focal plane array}{51}
\contentsline {subsection}{\numberline {4.4.5}Beam dump optics}{52}
\contentsline {section}{\numberline {4.5}Polarimetry instrumentation}{52}
\contentsline {section}{\numberline {4.6}Operating beam intensity}{54}