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Welcome to the workshop on forward calorimetry

Welcome to the workshop on forward calorimetry. Overview. Richard Seto. FO rward CAL orimeter. Welcome!. Overview of FOCAL Jan 19-Review recommendations Goals/purpose of workshop and agenda. NSAC milestones – Physics Goals. pA physics – nuclear gluon pdf.  G. -Jet AuAu. transverse

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Welcome to the workshop on forward calorimetry

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  1. Welcome to the workshopon forward calorimetry Overview Richard Seto FOrward CALorimeter

  2. Welcome! • Overview of FOCAL • Jan 19-Review recommendations • Goals/purpose of workshop and agenda

  3. NSAC milestones – Physics Goals pA physics – nuclear gluon pdf  G -Jet AuAu transverse spin phenomena

  4. Look for saturation effects at low x Measure initial state of Heavy Ion Collision measure gluon PDF’s in nuclei! (DM8) x pA physics – nuclear gluon pdf Saturation at low x RGPb Nuclear Gluon PDF’s : DM8 xG(x) direct  jets –x resolution forward η(low-x)

  5. x Longitudinal Spin G, g(x) : HP12 DSSV finds • g(x) very small at medium x (even compared to GRSV or DNS) • best fit has a node at x ~ 0.1 • huge uncertainties at small x Current data is sensitive to G for xgluon= 0.020.3 EXTEND MEASUREMENTS TO LOW x! Forward Measure x RHIC range 0.05· x · 0.2 direct  jets –x resolution forward η(low-x) 0 0 small-x 0.001· x · 0.05

  6. use -jet to measure Sivers determination of the process dependence of the Sivers effect in g+jet events So what does Sivers tell us about orbital angular momentum? Major new Thrust Transverse Spin Phenomena: HP13 Sivers direct  -jet 0 forward η(low-x) large η coverage

  7. Study the medium via long range correlations with jets are these correlations from a response by the medium? “jet” “ridge” STAR Preliminary Correlations with jets in heavy Ion collisions: DM10 for example ? leading EM shower EM - shower large η coverage Jet correlations in AuAu

  8. direct  and electromagnetic showers jet angles to obtain x2 0 s forward  to reach low-x has large  coverage To meet these goals we must have a detector that measures: now what do we build?

  9. Central Arms ||<0.3 Tracking PbSc/PbGl(EMC) PID VTX to come Muon arms 1.1<||<2.4 magnet tracking -ID FVTX to come Schematic of PHENIX central magnet MPC 3<||<4 calorimetry

  10. Perfect space for FOCAL! (but tight!) 40 cm from Vertex FOCAL • EM bricks • 14 HAD bricks • HAD behind EM 20 cm of space nosecone

  11. FOCAL Requirements • Ability to measure photons and π0’s to 30 GeV • Energy resolution < 25%/E • Compact (20 cm depth) • Ability to identify EM/hadronic activity • Jet angular measurement • High granularity ~ similar to central arms • small mollier radius ~1.4 cm • large acceptance – rapidity coverage x2 ~ 0.001 • Densest calorimeter -> Si W We wanted large  coverage what sort of coverage if we put a detector where the nosecones are?

  12. FOCAL FOCAL Muon tracking Muon tracking VTX & FVTX FOCAL a large acceptance calorimeter tracking EMC 0 f coverage 2p tracking EMC MPC MPC -3 -2 -1 0 1 2 3 rapidity What’s missing? FORward CALorimetery

  13. reach in x2 for g(x) and GA(x) log(x2) EMC+VTX EMC+VTX+FOCAL EMC+VTX+FOCAL+MPC X2  10-3

  14. FOCAL Design

  15. Overall Detector – stack the bricks “brick” supertower 6cm 17 cm 6cm 85 cm Note this ledge may not be in the final design

  16. Pads Silicon Design Design Tungsten-Silicon Pads: 21 layers • 535 m silicon • 16 cells: 15.5mmx15.5mm X and Y Strips: 4 layers • x-y high resolution strip planes • 128 strips: 6.2cmx0.5mm γ/π0 Discriminator=EM0 segments= EM1 EM2 Supertower Particle Direction 6cm 4 planes of x-y “strips” (8 physical planes) 4 mm W Silicon “pads”

  17. Vital statistics • EM0= /0, EM1, EM2 segments • ~17 cm in length • 22 X0 ~ 0.9 • Strips – read out by SVX-4 • 8 layer *128 strips=1024 strips/super-tower • 1024 strips/super-tower*160 super-towers/side = 163,840 strips/side • 163840 strips/side (1detector/128 strips) = 1280 Strip Detectors/side • 163,840 strips /(128 channels/chip)= 1280 chips/side • Pads – read out by ADC– 3 longitudinal readouts • 160 supertowers/side*21 detectors/supertower= • 3360 Si pad detectors/side • 3360 detector*16channels/detector= 53760 pads/side • readout channels (pads) • 160 supe-rtowers/side *16 pads/tower*3 towers =7680 readouts/side • Bricks • 2x4 supertowers: 4 • 2x6 supertowers: 6 • 2x7 supertowers: 4

  18. Detection – how it works Some detector performance examples

  19. Status of simulations • Stand alone done w/ GEANT3/G4 to study • /0 separation, single track 0 (G4) • EM shower energy/angle resolutions (G4) • Full PISA • jet resolution (G3/PISA) • 2 track 0 (G3/PISA) • Several levels • Statistical errors, backgrounds, resolutions folded into Pythia level calculations • Full PISA simulation using old configuration • Transverse spin physics – task force formed – simulations in progress (early step is to put models etc into simulations) *PISA – PHENIX Geant3 simulation

  20. It’s a tracking device EM0 EM2 EM1 A 10 GeV photon “track” Pixel-like tracking: 3 layers + vertex Each “hit” is the center of gravity of the cluster in the segment Iterative pattern recognition algorithm uses a parameterization of the shower shape for energy sharing among clusters in a segment and among tracks in the calorimeter. vertex

  21. Energy Resolution (Geant4) New Geometry Excludes Strips no sampling fraction correction 0.00+0.20/√E adequate: we wanted ~ 0.25/√E

  22. /0 identification:Single track /0 50 GeV pi0 • for pt>5 GeV • showers overlap • use x/y + vertex to get opening angle • Energy from Calorimeter • Energy Asymmetry – assume 50-50 split as a first algorithm X-view 4-x, 2x Y-view 4-y, 3y invariant mass

  23. 10 GeV h~1.65 (Geant4-pp events) Assumed g region Assumed p0 region  0 • /0 identification: single track /0 • tested at various energies and angles, so far at pp multiplicities Fake g reconstruction: 20% Real p0 reconstruction: 50-60% Real g reconstruction: ~ 60% Fake p0 reconstruction ~ 5%

  24. Jan 19 – a review

  25. Jan 19 – review • Members • M. Grosse-Perdekamp (chair), Elke Aschenauer, Christine Aidala, Mike Leitch, Glenn Young • charge • assess the state of the plans for the FOCAL • physics justification - the potential impact of the physics program • technical design? adequate for physics objectives? • recommendations important guide for • a detector proposal • external project review • Timescale : in 9 to 12 months.

  26. Recommendations – from the exec summary • focus on the first three milestones for FOCAL proposal (dAu, Delta G, transverse physics) • measure parton distribution functions in nuclei at low x • physics critically depends on its ability to reconstruct  in p+p and d+Au

  27. Recommendations – physics groups • significant effort needed on simulations • form 4 FOCAL physics study groups (give freedom to leaders) • d-A • heavy ion • Delta-G • transverse spin • each group requires • an experienced group leader @ 0.2 FTE • With *great* urgency: provide sufficient manpower Delta-G (1 @0.5 FTE) • dAu (5 @ 0.5 FTE) • AuAu (2 @0.5 FTE) • transverse - group formed and working • proposal ready by September

  28. recommended schedule • April, 2009 • to PM: schedule and leadership + manpower for the physics study groups. (initial org chart) • to PM: organizational structure for the hardware side of the project (sub tasks, sub task leaders, institutional responsibilities) • Review of FEE, DAQ & trigger (TBD – in sync with ongoing run) • May, 2009: • to DC: FOCAL technology and design choice. simulation plans, goals, manpower and structure of physics study groups. • PM: review overall organizational structure (sub-tasks, sub-task managers, institutional responsibilities, FTE available, FTE needed etc.) • June, 2009: • PHENIX internal FOCAL budget review. • workshop on Forward Physics with the PHENIX detector upgrades. (this meeting and July Collab meeting) • July, 2009: FOCAL collaboration meeting: beam test results, simulation progress, simulation tasks left open? writing assignments. • September, 2009: proposal to PHENIX DC&EC. • October, 2009: External review.

  29. Goals for workshop • Physics • Solidify, clarify, and make more specific physics goals for proposal • Situation now • Theory status • Next measurements needed • How can the FOCAL contribute? • What is the competition? • What simulations needed? • introduce simulations to everyone • Fully determine physics groups • Who will do what • Discuss hardware interests • Set goals for funding strategy Be thinking 10 years!

  30. Agenda • 9:00-9:30 Welcome/intro to FOCAL –Rich Seto • Introductory Talks • 9:30-10:00 Questions in Spin Physics - Elke Aschenauer • 10:00-10:30 Transverse Physics theory - Andreas Metz • Topics in Forward Physics • 10:30-11:00 Measuring Delta G - Mickey Chiu • 11:00-11:15 Break • 11:15-11:45 Transverse physics - John Lajoie • 11:45-12:15 pA - Mike Leitch • 12:15-12:45 AuAu - Justin Franz • 12:45-1:45 Lunch Afternoon-focus on PHENIX/FOCAL • 1:45-2:15 Status of FOCAL hardware - Edouard Kistenev • 2:15-2:45 Triggering and Electronics - Andrey Sukhanov • Simulations • 2:45-3:15 Questions to attack - Yongil Kwon • 3:15-3:45 Status - Ondrej Chvala • 3:45-4:00 Spin readiness - Richard Hollis • 4:00-4:15 Break • 4:15-4:30 Funding/Schedule - Rich Seto • 4:30-5:30 Discussion Introductory talks the physics (groups) the hardware Organization and planning

  31. Backup

  32. Resolutions • EM shower • energy – 20%/E • angular – 6mr • Jet angular resolution • 60 mr @ pt=20 GeV jet angular resolution Full PISA simulation PT

  33. occupancy high energy em shower ? • 0 singe track 0

  34. CAD guidance (29-dec-08) p+p

  35. CAD guidance (29-dec-08) Au+Au

  36. sum total over all years

  37. /0 identification: pp 2 track 0 pT<5 GeV E=6-10 GeV pt=2.-2.5 y=1-1.5 pt=1.-1.5 y=1-1.5 pt=4.-4.5 y=1-1.5 pt=1.5-2.0 y=1.5-2.0 pt=0.5-1.0 y=2-2.5 pt=0.5-1.0 y=1.5-2.0

  38. x2 resolution – no radiationDetector smearing only we will assume lowest x is xgluon log(x2) Note: radiative smearing is at least as big as detector smearing (use NNLO QCD) x2~ resolution 15% can pick out regions of x2

  39. Design (4 x-y planes) [backup] • EM0= /0, EM1, EM2 segments, leaves 4-5 cm • no room for hadronic segment • 22 X0 0.9 (originally NCC was 14 X0 +28 X0 (HAD) 1.4) old “NCC” γ/π0 Discriminator=EM0 segments= EM1 EM2 Supertower Particle Direction 4 mm W 4 planes of x-y “strips” (8 physical planes) Silicon “pads”

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