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The GlueX Detector

Curtis A. Meyer. The GlueX Detector. This talk. Next talk. The GlueX Detector. This talk will start with the physics goals of GlueX and what GlueX has to be able to do to achieve them Present the detector as a whole and what the components do individually and collectively.

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The GlueX Detector

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  1. Curtis A. Meyer The GlueX Detector This talk Next talk GlueX Detector Review

  2. The GlueX Detector This talk will start with the physics goals of GlueX and what GlueX has to be able to do to achieve them Present the detector as a whole and what the components do individually and collectively. Show that the GlueX detector can achieve the physics goals. Follow up talks will go into much more detail on each of the individual detectors elements. GlueX Detector Review

  3. Search for QCD Exotics  ,K,g X n,p p The GlueX Detector Design has been driven by the need to carry out Amplitude analysis. 11’1 b2 h2 h’2 b0 h0 h’0 h1 a+1p-! (o+)(-)!+-+- h0  bo1po! (o)gg!+-gggggg h’2  K+1K- !o K+ K-!+-K+K- Photoproduction Final state particles § K§ p n KL GlueX Detector Review

  4. Physics Requirements A Good Partial Wave Analysis Requires: Hermetic Detectorfor charged particles and photons. Uniform, understood acceptance. Excellent resolution to reduce backgrounds. Linear polarized photons. High statistics data sets. Sensitive to many final states. GlueX Detector Review

  5. Rates High statistics means high rates At 107, the total hadronic rate is » 37kHz the tagged hadronic rate is » 1.4kHz At 108, the total hadronic rate is » 370kHz the tagged hadronic rate is » 14kHz Initially 107 tagged /s Design detector for 108 JLab CLAS runs at 107 already. Running at 107 for 1 year will exceed current photoproduction data by several orders of magnitude and will exceed current data. More on rates in the next presentation GlueX Detector Review

  6. Topologies  ,K,g X n,p p Incident 8-9 GeV  Lorentz boost t-channel meson photoproduction (t)» e- t photons pions protons 10-60o ~1GeV/c GlueX Detector Review

  7. Background Topologies  ,K,g X  n,p  p /N* production is a significant background to the simple t-channel production. There is interesting physics in this channel, it is just more complicated to analyze. protons pions photons forward backwards slow pions GlueX Detector Review

  8. The GlueX Detector Particle ID Tracking Calorimetry Magnetic Field GlueX Detector Review

  9. The GlueX Detector GlueX Detector Review

  10. HallD and GlueX GlueX Detector Review

  11. The Solenoid LASS Solenoid Superconducting 2.24T Used in Los Alamos MEGA Experiment. Moved to IUCF for refurbishing Oct. 2003. GlueX Detector Review

  12. The Solenoid Clear Bore: 185.4 cm diameter Magnet Length: 495.3 cm Solenoid Field: 22.4 kG Uniformity: +- 3% in clear bore +- 1% on axis 4 superconducting coils coils 1 & 2 are complete new gauges, insulation leaks and plumbing fixed pressure tested. Coils 3 & 4 are waiting for contract completion Magnet Review Magnet Assessment at LANL “looks very good” March 2001. Now have experience from 2 coils Interim assessment later this year GlueX Detector Review

  13. Calorimetry Forward Calorimeter LGD Existing lead glass detector ~2500 blocks E/E · 0.036+0.073/E1/2 » 100 MeV · E· 8 GeV Barrel Calorimeter BCAL Lead-scifiber sandwich 4m long cylinder E/E · 0.020+0.05/E1/2 ~20MeV · E·» 3 GeV 200ps timing resolution z-position of shower time-of-flight Expected o and  resolutions Upstream Photon Veto UPV Veto photons ~20MeV · E· 300 MeV GlueX Detector Review

  14. Calorimetry GlueX Detector Review

  15. Tracking Forward Region FDC 4 packages of planar drift chambers anode + cathode readout six planes per package xy=150m active close to the beam line. Central Region CDC cylindrical straw-tube chamber 23 layers from 14cm to 58cm 6o stereo layers r=150m z» 2mm minimize downstream endplate dE/dx for p<450 MeV/c Necessary for protons GlueX Detector Review

  16. Tracking Forward Region FDC 4 packages of planar drift chambers anode + cathode readout six planes per package xy=150 m active close to the beam line. Central Region CDC cylindrical straw-tube chamber 23 layers from 14cm to 58cm 6o stereo layers r=150m z» 2mm minimize downstream endplate dE/dx for p<450 MeV/c Necessary for protons GlueX Detector Review

  17. Tracking GlueX Detector Review

  18. Particle Identification Time-of-flight Systems Forward tof ~80ps BCAL ~200ps Start counter Cherenkov Detector DIRC  K p separation dE/dx Information The CDC will do dE/dx p<450 MeV/c GlueX Detector Review

  19. Particle Identification The documentation discusses both a DIRC design and an atmospheric pressure Gas Cherenkov design. We do not believe that the latter will satisfy the physics requirements of GlueX. The DIRC design will accomplish the physics goals of the GlueX experiment. There are collaborators interested in pursuing the DIRC design and construction. GlueX Detector Review

  20. Particle Identification FTOF BCAL Separation from individual systems Cherenkov DIRC CDC dE/dx GlueX Detector Review

  21. Acceptance Very High » 0.99 » 0.98 p !1 p !+-4 p Very uniform over PWA angles Acceptance GJ cosGJ GlueX Detector Review

  22. Acceptance Very High » 0.99 » 0.98 p !1 p ! 8 p Very uniform over PWA angles Acceptance GJ cosGJ GlueX Detector Review

  23. Partial Wave Analysis p r g X p p p n a2 p2 h=+1 h=-1 fGJ h=+1 h=-1 h=+1 m3p [GeV/c2] Double blind studies of 3 final states GlueX Monte Carlo p !1+n!++-n !+00n Polarization GlueX Detector Review

  24. Leakage BNL E852 Result Exotic signal 1(1600) Leakage from non-exotic wave due to imperfectly understood acceptance If your acceptance is not well understood, The PWA can “leak” one wave into another. GlueX Detector Review

  25. Leakage If your acceptance is not well understood, The PWA can “leak” one wave into another. neutral Break the GlueX detector in Monte Carlo: distort B-field degrade resolution change hole sizes distort beam energy Largest leakage is ~ 1/2% of a strong signal. a1(1++) $1(1-+) charged GlueX Detector Review

  26. Partial Wave Analysis Have been able to pull out signals that are ~1% of a strong signal using PWA. It is extremely difficult to produce leakage that is as large as 1%. Assuming a good theoretical understanding, if hybrids are present at ~1% of normal mesons strength, this detector will be able to find them. GlueX Detector Review

  27. Summary The combination of detector elements with their resolution requirements allows us achieve the GlueX physics goals. The GlueX Detector has been optimized for Partial Wave analysis, and the design has been tested by carrying out these analyses on simulated data. You will see that the status of all the detectors in the following talks. Some exist, most are in R&D, with all stages of R&D. The collaboration is satisfied with the very recent DIRC design for the Cherenkov detector. GlueX Detector Review

  28. GlueX Detector Review

  29. Acceptance Acceptance hel coshel Acceptance coshel hel GlueX Detector Review

  30. Search for QCD Exotics  ,K,g X n,p p The GlueX Detector Design has been driven by the need to carry out Amplitude analysis. 1 b1 , f1 ,  , a1 1:.25:.25:.20 h1p(1300)p , a1p 1:1 ’1! K0K, K1K b2  a1p , h1p , wp , a2p 1:1:0.5:0.25 h2  b1p , rp , wh 1:1:0.1 h’2! K1K, b0  p(1300)p , h1p 1:0.20 h0  b1p , h1h 1:0.02 h’0! K1K, h01 Photoproduction h1 a1p ! ()()! Final State Particles 0! h0  b1p ! ()! § K§ KL n p GlueX Detector Review

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