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GlueX Upgrade Workshop

GlueX Upgrade Workshop. Curtis Meyer. Participants. Barnes , Alexander UCONN Barnes , Frank DOE/NP Chudakov , Eugene Jlab Crede , Volker FSU Doughty , David CNU Dugger , Michael ASU Egiyan , Hovanes Jlab Eugenio , Paul FSU

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GlueX Upgrade Workshop

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  1. GlueX Upgrade Workshop Curtis Meyer

  2. Participants Barnes , Alexander UCONN Barnes , Frank DOE/NP Chudakov, Eugene JlabCrede , Volker FSU Doughty , David CNU Dugger , Michael ASU Egiyan , HovanesJlab Eugenio , Paul FSU Gan , Liping UNCW Jarvis , Naomi CMU Jones , Richard UCONN Lawrence , David JlabLeckey , John IU Livingston , Ken Glasgow McIntyre , James UCONN Meyer , Curtis CMU Mokaya , Fridah UCONN Pentchev , LubomirJlab Pratt , Brendan UCONN Qiang , Yi Jefferson Lab Senderovich , Igor Uconn. Shepherd , Matthew IU Smith , Elton JLab Sober , Daniel CUA Sparks , Nathan FSU Taylor , Simon Jlab Williams , Mike MIT Young, Glen Jlab Zihlmann, BeniJLab GlueX Collaboration Meeting

  3. Workshop Agenda 8:15 Session Ia (15) --- Opening - Chair: 8:15 (15) --- Welcome and Goals - Curtis Meyer. 8:30 Session Ib (90) --- Calorimetry Upgrades - Chair: 8:30 (30) --- Upgrade FCAL with PWO Crystals -- LipingGan 9:00 (30) --- Forward Calorimetry - Alex Somov 9:30 (30) --- Discussion - 10:00 (30) Coffee 10:30 Session Ic (60) --- Photon Beam Upgrades - Chair: 10:30 (20) --- Polarimetry - Mike Dugger 10:50 (20) --- Polarimetry: Prototype design and test in Mainz - Ken Livingston 11:10 (20) --- Discussion 11:30 Session Id (60) --- Upgrades - Chair: 11:30 (30) --- Level-three trigger - Elliott Wolin 12:00 (30) --- Discussion 12:30 (60) Lunch 13:30 Session IIa (125) --- Particle ID Upgrades - Chair: 13:30 (30) --- Forward PID - Yi Qiang 14:00 (30) --- Forward PID - Mike Williams 14:30 (30) --- Helium Drift Chamber - LubomirPentchev 15:00 (30) Discussion 15:30 Session IIb (30) --- Closeout - (Organizer:) Chair: 15:30 (30) --- Moving Forward, opportunities for SURA funding? - Curtis Meyer 16:00 Adjourn GlueX Collaboration Meeting

  4. Calorimeter Upgrades Replace the FCAL with a new device based on lead-tungstate crystals. Appears to be needed for the rare-eta decay proposal that was just submitted. The right device would likely improve GlueX physics Would help in PrimEx. GlueX Collaboration Meeting

  5. Needed Work • Simulation and reconstruction needs to be on par with the current FCAL. It is not accurate to compare GEANT/JANA with PrimEx parameterizations. • IMHO need additional physics justifications to support the cost of this detector. • Show impact on GlueX/Spectroscopy • … • Define how large this needs to be for various physics cases. • Much is in progress for the PAC proposal in mid. June. GlueX Collaboration Meeting

  6. Polarimetry • Triplet Production • Pair production off a nucleon: γnucleon → nucleon e+ e-. • For polarized photons σ= σ0[1 + PΣ cos(2φ)], where σ0 is the unpolarized cross section, P is the photon beam polarization and Σis the beam asymmetry • Triplet production off an electron: γ e- → eR- e+ e-, where eRrepresents the recoil electron • Any residual momentum in the transverse direction of the e- e+ pair is compensated for by the slow moving recoil electron. This means that the recoil electron can attain large polar angles shifted about 90 degrees in the azimuthal direction relative to the plane containing the pair. How well do we know our photon polarization? GlueX Collaboration Meeting

  7. Polarimetry Front: 4 sectors 16 strips/sector Back: 16 sectors Cost: $7500 (back stock) Manufacturer: Micron Semiconductor 96mm 48mm GlueX Collaboration Meeting

  8. 300 MB/s 300 MB/s 300 MB/s ROC ROC ROC ROC ROC ROC DAQ at Low Luminosity 300 MByte/sec E MU E MU E MU E MU E MU E MU E MU 16 TB 16 hrs 300 MB/s 300 MB/s Monitoring Farm No Rejection RAID 1 EMU 300 MB/s SILO in Computer Center 2 PB/year 12 Monitoring Nodes 6 EMUs 6 EMUs 50 ROCs Event Builder Crossbar

  9. Level-3 Trigger • Level-3 Trigger • 100 Hz/core, have 200kHz of rate • 2000 compute cores • ~200 k$ • Storage cost to skip L3 is ~500k$/year Get level-3 sooner rather than later!

  10. Particle Identification • GlueX was proposed as an experiment to map out the light-quark spectrum of QCD exotics including strangeonium states. These latter states decay predominantly to final states that include kaons. • Our Forward PID system (Gas threshold Cherenkov) was descoped in 2008 to build up a project contingency. • Our just-submitted proposal focuses on the final states with strangeness. • We need to revisit the best approach to get “excellent” PID in the forward direction to be able to carry out our physics. GlueX Collaboration Meeting

  11. Three Proposals • Yi Qaing - HBRICH Gem-readout based detector that could sit in the tracking volume between the FDC packages. • Mike Williams – LHCb style RICH design that would fit in the original space reserved for a Cherenkov system. • LubomirPentchev – Helium filled drift chambers using cluster counting. GlueX Collaboration Meeting

  12. A HBRICH Detector for GlueX • A conceptual design inside the Barrel • Momentum coverage: 1.2 – 4.5 GeV/c • Refractive index: n > 1.1 • Angular Coverage: 0 – 15 degrees • Before the 3rdFDC • May impact tracking badly. • Proximity focus, mirror less • Primary radiator: 15 mm Freon, n = 1.28 • Secondary Radiator: CF4 • Cs-I GEM covers end cap and barrel region • Immune to magnetic field

  13. LHCb RHICH-1 Design • Might be able to nearly copy an existing design, but the readout can probably be smaller. We don’t have the complicated LHCb events. • Only covers the forward ~10-degree hole, but has excellent PID from where the TOF gives up to beyond 10 GeV/c. GlueX Collaboration Meeting

  14. Helium Cluster Counting Modification of FDC Two eight-chamber packages ZERO material: Helium replaces air that mostly compensates for additional material THEREFORE: Can be placed in between FDC packages as close as possible to target for higher angular acceptance Provides both: PID and TRACKING 14

  15. Moving Forward • Need to put the various geometries into our MC and see how they impact tracking and photon reconstruction. We need all of these for our physics • Look at PID with kinematic fitting to try and judge how well we need to be able to do under the missing baryon (1C) scenario. • See how well the PID systems match our physics needs. GlueX Collaboration Meeting

  16. Summary • A very useful 1-day workshop. • It is great to see people thinking about new ideas, and this sort of focused forum is very useful to get ideas out. • We have plans for moving forward on all fronts. • This would certainly be a useful workshop to hold on a more regular basis. GlueX Collaboration Meeting

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