\contentsline {chapter}{\numberline {1}Introduction}{1}
\contentsline {section}{\numberline {1.1}History of the project}{1}
\contentsline {section}{\numberline {1.2}Synopsis of R\&D Efforts}{2}
\contentsline {section}{\numberline {1.3}Summary}{3}
\contentsline {chapter}{\numberline {2}Executive Summary}{5}
\contentsline {section}{\numberline {2.1}Physics and overview}{5}
\contentsline {section}{\numberline {2.2}Photon beam and choice of energy}{8}
\contentsline {section}{\numberline {2.3}Detector and solenoid}{10}
\contentsline {section}{\numberline {2.4}Electronics}{12}
\contentsline {section}{\numberline {2.5}Rates and triggers}{13}
\contentsline {section}{\numberline {2.6}Computing}{13}
\contentsline {section}{\numberline {2.7}Monte Carlo}{13}
\contentsline {section}{\numberline {2.8}PWA}{13}
\contentsline {section}{\numberline {2.9}Cassel review}{14}
\contentsline {section}{\numberline {2.10}Management plan}{14}
\contentsline {section}{\numberline {2.11}NSAC report}{14}
\contentsline {section}{\numberline {2.12}Civil construction}{14}
\contentsline {chapter}{\numberline {3}Scientific Goals}{15}
\contentsline {section}{\numberline {3.1}Introduction}{15}
\contentsline {section}{\numberline {3.2}Conventional light mesons}{17}
\contentsline {section}{\numberline {3.3}Gluonic excitations and confinement}{18}
\contentsline {section}{\numberline {3.4}Observation of gluonic excitations}{22}
\contentsline {subsection}{\numberline {3.4.1}Glueballs}{22}
\contentsline {subsection}{\numberline {3.4.2}Exotic hybrid mesons}{22}
\contentsline {section}{\numberline {3.5}Photoproduction of exotic hybrids}{25}
\contentsline {subsection}{\numberline {3.5.1}Why photoproduction?}{25}
\contentsline {subsection}{\numberline {3.5.2}Current photoproduction data}{26}
\contentsline {section}{\numberline {3.6}Complementarity with other searches}{29}
\contentsline {section}{\numberline {3.7}Production and analysis of hybrid mesons}{29}
\contentsline {subsection}{\numberline {3.7.1}Kinematics}{29}
\contentsline {subsection}{\numberline {3.7.2}PWA requirements}{30}
\contentsline {subsection}{\numberline {3.7.3}Linear polarization of the beam}{30}
\contentsline {subsubsection}{Linear and circular polarization}{30}
\contentsline {subsubsection}{Linear polarization and statistics}{31}
\contentsline {subsubsection}{Linear polarization and production mechanism}{32}
\contentsline {subsubsection}{Linear polarization as an exotics filter}{32}
\contentsline {chapter}{\numberline {4}Photon Beam}{33}
\contentsline {section}{\numberline {4.1}Choice of Technique}{33}
\contentsline {subsection}{\numberline {4.1.1}Compton Back-scatter}{34}
\contentsline {subsection}{\numberline {4.1.2}Tagged Bremsstrahlung}{36}
\contentsline {subsection}{\numberline {4.1.3}Coherent Bremsstrahlung}{36}
\contentsline {section}{\numberline {4.2}Photon Source}{37}
\contentsline {subsection}{\numberline {4.2.1}Essential Features}{38}
\contentsline {subsection}{\numberline {4.2.2}Use of Collimation}{39}
\contentsline {subsection}{\numberline {4.2.3}Choice of Radiator}{44}
\contentsline {subsection}{\numberline {4.2.4}Crystal Quality}{46}
\contentsline {subsection}{\numberline {4.2.5}Crystal Thickness}{48}
\contentsline {subsection}{\numberline {4.2.6}Crystal Mount}{51}
\contentsline {subsection}{\numberline {4.2.7}Crystal Alignment and Monitoring}{52}
\contentsline {subsection}{\numberline {4.2.8}Crystal Lifetime}{53}
\contentsline {section}{\numberline {4.3}Electron Beam}{55}
\contentsline {subsection}{\numberline {4.3.1}Beam Polarization}{55}
\contentsline {subsection}{\numberline {4.3.2}Beam Emittance}{56}
\contentsline {subsection}{\numberline {4.3.3}Electron Beam Line Optics}{58}
\contentsline {subsection}{\numberline {4.3.4}Electron Beam Dump}{58}
\contentsline {subsection}{\numberline {4.3.5}Beam Containment and Shielding}{58}
\contentsline {section}{\numberline {4.4}Tagging Spectrometer}{61}
\contentsline {subsection}{\numberline {4.4.1}Specifications}{61}
\contentsline {subsection}{\numberline {4.4.2}Magnet}{61}
\contentsline {subsection}{\numberline {4.4.3}Spectrometer Optics}{64}
\contentsline {subsection}{\numberline {4.4.4}Tagger Detectors}{66}
\contentsline {subsubsection}{Fixed Focal Plane Array}{66}
\contentsline {subsubsection}{Focal Plane Microscope Detectors}{67}
\contentsline {subsection}{\numberline {4.4.5}Beam Dump Optics}{68}
\contentsline {section}{\numberline {4.5}Polarimetry Instrumentation}{68}
\contentsline {section}{\numberline {4.6}Operating Beam Intensity}{70}
\contentsline {chapter}{\numberline {5}The Superconducting Solenoid}{71}
\contentsline {section}{\numberline {5.1}Introduction}{71}
\contentsline {section}{\numberline {5.2}Brief Description}{71}
\contentsline {section}{\numberline {5.3}Solenoid Refurbishment Activities}{72}
\contentsline {subsection}{\numberline {5.3.1}Detailed Tests of The Coils}{72}
\contentsline {subsection}{\numberline {5.3.2}Refurbishment of Coils One and Two}{74}
\contentsline {subsection}{\numberline {5.3.3}Plans To Complete Coils Three and Four}{74}
\contentsline {subsection}{\numberline {5.3.4}Plans To Complete The Solenoid at {JLab}}{74}
\contentsline {section}{\numberline {5.4}The Magnetic Field of The Solenoid}{75}
\contentsline {subsection}{\numberline {5.4.1}Magnetic Modifications Needed}{75}
\contentsline {subsection}{\numberline {5.4.2}TOSCA Simulations}{75}
\contentsline {subsubsection}{TOSCA Model}{75}
\contentsline {subsubsection}{Preliminary Results}{77}
\contentsline {subsection}{\numberline {5.4.3}Compensation of the Upstream Plug}{78}
\contentsline {chapter}{\numberline {6}The {\textsc {GlueX}}{} Detector in {\textsc {Hall\nobreakspace {}D}}{} }{81}
\contentsline {section}{\numberline {6.1}Overview}{81}
\contentsline {section}{\numberline {6.2}The Target}{81}
\contentsline {section}{\numberline {6.3}Calorimetry}{84}
\contentsline {subsection}{\numberline {6.3.1}Global Design}{84}
\contentsline {subsection}{\numberline {6.3.2}The Lead-Glass Calorimeter}{84}
\contentsline {subsubsection}{The E852 Experience}{85}
\contentsline {subsubsection}{The Radphi Experience}{87}
\contentsline {subsubsection}{Estimating the {\textsc {GlueX}}\ $\pi ^0$ and $\eta $ Mass Resolutions}{89}
\contentsline {subsubsection}{Electromagnetic Backgrounds}{90}
\contentsline {subsubsection}{Radiation Damage}{90}
\contentsline {paragraph}{Heat Curing of Damaged Blocks}{93}
\contentsline {subsubsection}{Assessing Lead Glass Blocks and PMT's}{93}
\contentsline {paragraph}{Lead glass block evaluation}{93}
\contentsline {paragraph}{PMT Evaluation}{93}
\contentsline {subsubsection}{Other Issues}{94}
\contentsline {paragraph}{Electromagnetic Rates in the LGD}{94}
\contentsline {paragraph}{Magnetic Shielding}{94}
\contentsline {paragraph}{Monitoring}{94}
\contentsline {paragraph}{Calibration}{95}
\contentsline {paragraph}{Triggering}{95}
\contentsline {subsection}{\numberline {6.3.3}Barrel Calorimetry }{95}
\contentsline {subsubsection}{Design Considerations}{95}
\contentsline {subsubsection}{Pb/SciFi Barrel Calorimeter}{96}
\contentsline {subsubsection}{The {\textsc {GlueX}}{} BCAL }{97}
\contentsline {subsubsection}{Construction of Prototype Modules}{98}
\contentsline {paragraph}{Production of Lead Sheets}{99}
\contentsline {paragraph}{Module Construction}{99}
\contentsline {subsubsection}{Scintillating Fiber Tests}{100}
\contentsline {subsubsection}{Fiber Light Transmission Tests}{102}
\contentsline {subsubsection}{Silicon Photomultiplier Tests}{104}
\contentsline {subsection}{\numberline {6.3.4}Upstream Photon Veto}{109}
\contentsline {subsubsection}{Design Considerations}{109}
\contentsline {section}{\numberline {6.4}Charged Particle Tracking}{112}
\contentsline {subsection}{\numberline {6.4.1}Design Considerations}{112}
\contentsline {subsection}{\numberline {6.4.2}Track Reconstruction}{114}
\contentsline {subsection}{\numberline {6.4.3}Straw-tube Drift Chamber}{117}
\contentsline {subsection}{\numberline {6.4.4}Forward Drift Chambers}{125}
\contentsline {subsubsection}{FDC Monte Carlo Studies}{128}
\contentsline {subsubsection}{Cathode Strip Chambers}{129}
\contentsline {subsubsection}{Resolution Effects}{132}
\contentsline {subsubsection}{Gas Considerations}{132}
\contentsline {subsubsection}{Readout Electronics}{133}
\contentsline {subsubsection}{FDC Cathode Chamber Prototype}{133}
\contentsline {subsection}{\numberline {6.4.5}The Start Counter}{138}
\contentsline {section}{\numberline {6.5}Particle Identification}{138}
\contentsline {subsection}{\numberline {6.5.1}Overview}{138}
\contentsline {paragraph}{Required Design Parameters}{143}
\contentsline {subsubsection}{$dE/dx$ in the chambers}{143}
\contentsline {subsection}{\numberline {6.5.2}The Time-of-flight System}{143}
\contentsline {subsubsection}{Barrel Time-of-flight Measurement}{143}
\contentsline {subsubsection}{The Lead Glass Forward Calorimeter}{143}
\contentsline {subsubsection}{Prototype Studies}{144}
\contentsline {paragraph}{Cosmic Ray Test Facility}{144}
\contentsline {paragraph}{Measurements Made in a Hadron Beam at IHEP}{144}
\contentsline {subsubsection}{Conclusions and remaining issues}{147}
\contentsline {subsection}{\numberline {6.5.3}\v {C}erenkov Counter}{148}
\contentsline {subsubsection}{A DIRC \v {C}erenkov Detector}{148}
\contentsline {subsubsection}{The BABAR DIRC}{149}
\contentsline {subsubsection}{Principle of the BABAR DIRC}{150}
\contentsline {subsubsection}{Imaging with Synthetic Fused Silica}{152}
\contentsline {subsubsection}{Features of the BABAR DIRC}{152}
\contentsline {subsubsection}{Requirements for GlueX}{153}
\contentsline {paragraph}{Particle Momenta and Angle of Incidence}{153}
\contentsline {paragraph}{Beam Background}{154}
\contentsline {paragraph}{Magnetic Field}{156}
\contentsline {paragraph}{Irradiation}{156}
\contentsline {subsubsection}{Conceptual Design}{156}
\contentsline {subsubsection}{The Gas \v {C}erenkov Counter System}{161}
\contentsline {subsection}{\numberline {6.5.4}Acceptance of The Particle Identification System}{162}
\contentsline {section}{\numberline {6.6}Detector Integration}{168}
\contentsline {subsection}{\numberline {6.6.1}Assembly and Mounting}{170}
\contentsline {subsection}{\numberline {6.6.2}Survey and Alignment}{172}
\contentsline {subsection}{\numberline {6.6.3}Access}{172}
\contentsline {subsection}{\numberline {6.6.4}Interaction Between Subsystems}{173}
\contentsline {subsection}{\numberline {6.6.5}Cabling}{173}
\contentsline {chapter}{\numberline {7}Readout Electronics}{175}
\contentsline {section}{\numberline {7.1}Overview}{175}
\contentsline {section}{\numberline {7.2}FADCs for Calorimetry}{175}
\contentsline {subsection}{\numberline {7.2.1}Prototype }{177}
\contentsline {subsection}{\numberline {7.2.2}Additional requirements for final version}{178}
\contentsline {section}{\numberline {7.3}FADCs for Tracking}{178}
\contentsline {section}{\numberline {7.4}TDCs}{179}
\contentsline {subsection}{\numberline {7.4.1}Jefferson Lab TDC}{179}
\contentsline {subsection}{\numberline {7.4.2}TDC Performance}{181}
\contentsline {subsection}{\numberline {7.4.3}Additional requirements for final version}{182}
\contentsline {section}{\numberline {7.5}Track Count}{183}
\contentsline {section}{\numberline {7.6}Clock Distribution and Pipeline Synchronization}{183}
\contentsline {section}{\numberline {7.7}Discriminators and Amplifiers}{183}
\contentsline {section}{\numberline {7.8}High Voltage}{183}
\contentsline {section}{\numberline {7.9}Packaging}{183}
\contentsline {section}{\numberline {7.10}Readout Bus}{185}
\contentsline {section}{\numberline {7.11}Construction}{185}
\contentsline {section}{\numberline {7.12}Review}{186}
\contentsline {chapter}{\numberline {8}Rates, Trigger and Data Acquisition}{187}
\contentsline {section}{\numberline {8.1}Expected rates}{187}
\contentsline {subsection}{\numberline {8.1.1}Overview}{187}
\contentsline {subsection}{\numberline {8.1.2}Trigger elements}{188}
\contentsline {subsection}{\numberline {8.1.3}Accidental rates}{189}
\contentsline {subsection}{\numberline {8.1.4}Rates in tracking chambers}{189}
\contentsline {section}{\numberline {8.2}Trigger}{191}
\contentsline {subsection}{\numberline {8.2.1}Overview}{191}
\contentsline {subsection}{\numberline {8.2.2}Level 1 trigger}{193}
\contentsline {subsection}{\numberline {8.2.3}Trigger simulation}{195}
\contentsline {section}{\numberline {8.3}Data acquisition}{196}
\contentsline {subsection}{\numberline {8.3.1}Overview}{196}
\contentsline {subsection}{\numberline {8.3.2}Data flow and rates}{196}
\contentsline {subsection}{\numberline {8.3.3}Level 3 trigger}{197}
\contentsline {subsection}{\numberline {8.3.4}Monitoring and Control}{197}
\contentsline {chapter}{\numberline {9}Computing}{199}
\contentsline {section}{\numberline {9.1}Overview}{199}
\contentsline {section}{\numberline {9.2}Background}{199}
\contentsline {subsection}{\numberline {9.2.1}Special features of {\textsc {GlueX}}}{200}
\contentsline {subsection}{\numberline {9.2.2}CPU, Storage, and Bandwidth Requirements}{201}
\contentsline {section}{\numberline {9.3}Computing Strategy}{201}
\contentsline {subsection}{\numberline {9.3.1}Jefferson Lab Computing Resources}{203}
\contentsline {subsubsection}{Data Storage}{203}
\contentsline {subsubsection}{Data Acquisition and Interface to Electronics}{203}
\contentsline {subsubsection}{Experiment Calibration and Detector Monitoring}{204}
\contentsline {subsubsection}{Data Reduction: Reconstruction from Raw Data}{204}
\contentsline {subsubsection}{Other Tasks}{204}
\contentsline {subsection}{\numberline {9.3.2}Off-site Computing Infrastructure}{204}
\contentsline {subsubsection}{Distributed Data Storage Considerations}{204}
\contentsline {subsubsection}{Physics and Detector Simulations}{205}
\contentsline {subsubsection}{Partial Wave Analysis: Methodology and implementation}{205}
\contentsline {subsubsection}{Record-keeping and Collaboration Interface}{205}
\contentsline {subsection}{\numberline {9.3.3}Software Model}{205}
\contentsline {section}{\numberline {9.4}Organization}{206}
\contentsline {chapter}{\numberline {10}Monte Carlo}{209}
\contentsline {section}{\numberline {10.1}Monte Carlo framework}{210}
\contentsline {section}{\numberline {10.2}Monte Carlo generators}{212}
\contentsline {section}{\numberline {10.3}Detector Geometry}{212}
\contentsline {section}{\numberline {10.4}Physics Simulation}{213}
\contentsline {section}{\numberline {10.5}Fast simulation}{215}
\contentsline {section}{\numberline {10.6}Acceptance studies}{216}
\contentsline {subsection}{\numberline {10.6.1}Acceptance performance}{217}
\contentsline {section}{\numberline {10.7}Monte Carlo Study of Photon Energy Resolution}{217}
\contentsline {subsection}{\numberline {10.7.1}Photon Detector Energy Resolution}{224}
\contentsline {section}{\numberline {10.8}Physics Event Weighters}{226}
\contentsline {chapter}{\numberline {11}Partial Wave Analysis}{229}
\contentsline {section}{\numberline {11.1}Introduction}{229}
\contentsline {section}{\numberline {11.2}Beam and final state normalizations}{230}
\contentsline {section}{\numberline {11.3}A partial wave analysis study}{230}
\contentsline {subsection}{\numberline {11.3.1}The Role of Linear Polarization}{231}
\contentsline {subsection}{\numberline {11.3.2}The PWA Formalism and Results}{232}
\contentsline {subsection}{\numberline {11.3.3}Joint production of excited baryons and mesons}{239}
\contentsline {section}{\numberline {11.4}Leakage studies}{240}
\contentsline {section}{\numberline {11.5}Summary}{242}
\contentsline {chapter}{\numberline {A}Management Plan}{245}
\contentsline {section}{\numberline {A.1}Principles of the management plan}{245}
\contentsline {section}{\numberline {A.2}The {\textsc {Hall\nobreakspace {}D}}\ collaboration membership}{246}
\contentsline {section}{\numberline {A.3}The {\textsc {Hall\nobreakspace {}D}}\ governance structure}{246}
\contentsline {subsection}{\numberline {A.3.1}The {\textsc {Hall\nobreakspace {}D}}\ collaboration membership structure}{246}
\contentsline {subsection}{\numberline {A.3.2}The working groups}{247}
\contentsline {subsection}{\numberline {A.3.3}The technical review committee}{248}
\contentsline {subsubsection}{{\textsc {trc}}\ mandate}{248}
\contentsline {subsubsection}{{\textsc {trc}}\ structure}{248}
\contentsline {subsection}{\numberline {A.3.4}The executive group}{248}
\contentsline {subsubsection}{The experiment spokesman}{248}
\contentsline {subsubsection}{The deputy spokesman}{249}
\contentsline {subsubsection}{The {\textsc {Hall\nobreakspace {}D}}\ leader}{249}
\contentsline {subsection}{\numberline {A.3.5}The collaboration board}{249}
\contentsline {subsubsection}{The structure of the {\textsc {cb}}}{249}
\contentsline {subsubsection}{The mandate of the {\textsc {cb}}}{249}
\contentsline {subsubsection}{ The chair of the collaboration board}{250}
\contentsline {subsubsection}{General duties of {\textsc {cb}}\ officers}{250}
\contentsline {section}{\numberline {A.4}Summary}{251}
\contentsline {chapter}{\numberline {B}The report of the Cassel committee}{253}
\contentsline {chapter}{\numberline {C}Report of the Hall D Electronics Review Committee}{263}
\contentsline {chapter}{\numberline {D}The GlueX Detector Review}{267}
\contentsline {section}{\numberline {D.1}Introduction}{267}
\contentsline {section}{\numberline {D.2}Overall Comments}{267}
\contentsline {section}{\numberline {D.3}Overview of Subsystem Status}{268}
\contentsline {subsection}{\numberline {D.3.1}Photon Beam and Tagging Spectrometer}{268}
\contentsline {subsection}{\numberline {D.3.2}Forward Calorimeter}{269}
\contentsline {subsection}{\numberline {D.3.3}Barrel Calorimeter}{269}
\contentsline {subsection}{\numberline {D.3.4}Start Counter}{269}
\contentsline {subsection}{\numberline {D.3.5}Upstream Photon Veto UPV}{269}
\contentsline {subsection}{\numberline {D.3.6}Time of Flight Counters}{270}
\contentsline {subsection}{\numberline {D.3.7}Cherenkov Counter}{270}
\contentsline {subsection}{\numberline {D.3.8}Central Drift Chamber}{270}
\contentsline {subsection}{\numberline {D.3.9}Forward Drift Chamber}{271}
\contentsline {subsection}{\numberline {D.3.10}Particle ID}{272}
\contentsline {subsection}{\numberline {D.3.11}Software}{273}
\contentsline {subsection}{\numberline {D.3.12}DAQ and Electronics}{274}
\contentsline {subsection}{\numberline {D.3.13}Integration and Milestones}{274}
\contentsline {chapter}{\numberline {E}The Report of The GlueX Magnet Review}{277}
\contentsline {chapter}{\numberline {F}The Report of the Hall D Tagging Spectrometer and Photon Beamline Review}{281}
\contentsline {section}{\numberline {F.1}Charge}{281}
\contentsline {section}{\numberline {F.2}Executive Summary}{281}
\contentsline {section}{\numberline {F.3}Introduction}{282}
\contentsline {section}{\numberline {F.4}Experimental Requirements and Layout}{282}
\contentsline {section}{\numberline {F.5}Tagging System Design}{283}
\contentsline {subsection}{\numberline {F.5.1}Optics}{283}
\contentsline {subsection}{\numberline {F.5.2}Magnets}{284}
\contentsline {subsection}{\numberline {F.5.3}Vacuum System}{284}
\contentsline {subsection}{\numberline {F.5.4}Detector System}{284}
\contentsline {subsection}{\numberline {F.5.5}Assembly, Alignment, and Disassembly}{284}
\contentsline {section}{\numberline {F.6}Summary}{285}
\contentsline {section}{\numberline {F.7}Summary of the Recommendations}{285}
\contentsline {chapter}{\numberline {G}The NSAC Long Range Plan}{287}
\contentsline {chapter}{\numberline {H}Civil Construction}{291}
\contentsline {section}{\numberline {H.1}General requirements}{291}
\contentsline {subsection}{\numberline {H.1.1}Compatibility with future upgrades}{292}
\contentsline {section}{\numberline {H.2}Personnel protection}{293}
\contentsline {subsection}{\numberline {H.2.1}Failure scenarios}{293}
\contentsline {subsection}{\numberline {H.2.2}Beam containment proposal}{293}
\contentsline {subsubsection}{Electron beam on diamond radiator}{293}
\contentsline {subsubsection}{Electron beam on the dump}{293}
\contentsline {section}{\numberline {H.3}Environmental and radiation concerns}{294}
\contentsline {subsection}{\numberline {H.3.1}Site dose limits}{294}
\contentsline {paragraph}{On--Site}{294}
\contentsline {paragraph}{Site boundary}{294}
\contentsline {subsection}{\numberline {H.3.2}Beam on radiator}{294}
\contentsline {subsection}{\numberline {H.3.3}Tagger building}{294}
\contentsline {subsection}{\numberline {H.3.4}Tagger hodoscope}{294}
\contentsline {subsection}{\numberline {H.3.5}Electron beam dump}{294}
\contentsline {subsection}{\numberline {H.3.6}Collimator enclosure}{295}
\contentsline {subsection}{\numberline {H.3.7}Detector building}{295}
\contentsline {subsection}{\numberline {H.3.8}Photon beam dump}{296}
\contentsline {subsection}{\numberline {H.3.9}Ground water activation}{296}
\contentsline {section}{\numberline {H.4}Geotechnical analysis}{296}