1. Photon Source and Tagger Richard Jones, University of Connecticut GlueX Detector ReviewOctober 20-22, 2004, Newport News presented by GlueX Tagged Beam Working Group University of Glasgow University of Connecticut Catholic University of America

2. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 2 Photon Beam: coherent bremsstrahlung Criteria Criteria  high energyE g = 8-10 GeV  polarizationP O, P |  0.5  high fluxN g = 10 8 s -1  energy resolutions E = 10 MeV  low backgrounds Design options Design options A.laser backscatter B.synchrotron backscatter C.bremsstrahlung D.coherent bremsstrahlung energy     polarization     flux     resolution (  ) (  ) (  ) (  ) background    ABC (  ) with tagging D

3. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 3 Photon Beam: energy spectrum effects of collimation at 80 m distance from radiator incoherent (black) and coherent (red) kinematics

4. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 4 Photon Beam: coherent gain factor gain increases with electron beam energygain vanishes at the end-point

5. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 5 Photon Beam: polarization circular polarization  transfer from electron beam  reaches 100% at end-point linear polarization  determined by crystal orientation  vanishes at end-point 5

6. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 6 Photon Beam: polarization linear polarization polarization spectrumpeak polarization vs. electron energy 6

7. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 7 Photon Beam: collimation a < 20 mr s 0 < 1/3 c d > 70 m polarization grows with improved collimation

8. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 8 Electron Beam: properties energy12 GeV r.m.s. energy spread7 MeV transverse x emittance10 mm µr transverse y emittance2.5 mm µr electron polarizationavailable minimum current100 pA maximum current5 µA x spot size at radiator1.6 mm r.m.s. y spot size at radiator0.6 mm r.m.s. x spot size at collimator0.5 mm r.m.s. y spot size at collimator0.5 mm r.m.s. position stability±200 µm

9. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 9 Diamond crystal: properties limits on thickness from multiple-scatteringrocking curve from X-ray scattering

10. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 10 Diamond crystal: gonimeter mount natural width of diamond is ~5 mm

11. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 11 Tagging spectrometer Requirements Requirements  spectrum coverage 25% -- 85% in 0.5% steps 70% -- 75% in 0.1% steps  energy resolution 10 MeV r.m.s.  rate capability up to 400 MHz per GeV

12. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 12 Tagging spectrometer: two dipole design (selected spectrometer characteristics table here)

13. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 13 Tagging spectrometer: optics design (mm)

14. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 14 Tagger focal plane: fixed array (mm)

15. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 15 Tagger focal plane: microscope (mm)

16. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 16 Beam line: active collimator (mm)

17. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 17 Beam line: polarimetry (mm)

18. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 18 Beam line: shielding (mm)

19. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 19 Beam line: simulation (mm)

20. Richard Jones, GlueX Detector Review, Newport News, October 20-22, 2004 20 Beam line: rates and background (mm)