1 / 32

PHENIX: Status of upgrades and plan for run10/11

PHENIX: Status of upgrades and plan for run10/11. RSC meeting, October 2 Ralf Seidl (RIKEN BNL Research Center). New muon trigger system necessary. current trigger (MuID) threshold. W dominant region. simulated muons into Muon Arm (2000pb-1, with PYTHIA5.7).

huela
Download Presentation

PHENIX: Status of upgrades and plan for run10/11

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PHENIX:Status of upgrades and plan for run10/11 RSC meeting, October 2 Ralf Seidl (RIKEN BNL Research Center)

  2. New muon trigger system necessary current trigger (MuID) threshold W dominant region simulated muons into Muon Arm (2000pb-1, with PYTHIA5.7) PHENIX status of upgrades for run11 • σ(tot)=60mb, L=3x1032cm-2s-1 (500GeV) • collision rate = 18MHz • (after luminosity upgrade) • DAQ rate limit < 2kHz (for muon Arm) • Therefore, required rejection ratio • > 9000 • But, MuID-trigger rejection ratio (500GeV) • < 100 • We need momentum dependent trigger !

  3. PHENIX Muon Trigger Upgrade Project RPC MuID MuID RPC MuTR MuTR μ RPC absorber RPC (being installed) provide timing information and rough position information MuID trigger (existing) selecting muon momentum > 2GeV/c MuTR FEE upgrade (being installed) fast selection of high-momentum-tracks PHENIX status of upgrades for run11

  4. B Upgraded Muon Trigger System RPC RPC project timing information rough position information MuTRG project MuTr Level-1 trigger ADC digitalized hit signal digitalized hit signal digitalized hit signal ADC MuTRG-ADTX Level-1 trigger board sagitta ADC PHENIX status of upgrades for run11

  5. North Arm MuTRG installation status South Arm installation is ongoing will be completed in this shutdown • already finished installation • 2008 Summer • commissioning with run9 500GeV pp data PHENIX status of upgrades for run11

  6. hit efficiency in each station plateau eff = 98.7% plateau eff = 98.6% efficiency efficiency ADC ADC plateau eff = 98.4% efficiency ADC dashed line: the most probable ADCvalue of peak strip • efficiency = (# of MuTRG hits)/(# of MuTR hits) • considering ADC distribution, • hit efficiency ~ 97% in each station • Hit efficiencies in each station are good PHENIX status of upgrades for run11

  7. efficiency and threshold-momentum of MuTRG trigger efficiency vs track momentum sagitta allowance:Δs=1 current trigger threshold • plateau efficiency ~ 90% •  (hit efficiency par station ~ 97%)3 x (vertex cut efficiency) • higher threshold momentum than current trigger • achieve expected efficiency and threshold momentum • rejection ratio estimation is also on going PHENIX status of upgrades for run11

  8. RPC3 • RPC1 • RPC1 Resistive Plate Chamber (RPC) • Characteristics of RPC • Fast response • Suitable for the trigger device • Good intrinsic time resolution • Good spatial resolution: typically ~ cm • Determined by the read-out strip width and cluster size • Low cost • Typical gas mixture 95% C2H2F4 + 4.5% i-C4H10 + 0.5% SF6 South RPC3 North RPC3 RPC1 PHENIX status of upgrades for run11

  9. Half Octatant assembly in tunnel PHENIX status of upgrades for run11

  10. Module QA with cosmics Event display • Modules stay in cosmic test stand for at least several days • Evaluate Efficiencies and cluster sizes as a function of HV and threshold • Evaluate noise rates : Hz/cm2 PHENIX status of upgrades for run11

  11. Module efficiencies and Cluster sizes • High efficiencies from 9.5 kV at reasonably high thresholds • Cluster sizes in the range 1-2 • Typical operation mode: 9.7 kV and 140 mV PHENIX status of upgrades for run11

  12. RPC-3 half octant frame at UIUC RPC3N installation status • RPC-3 North installation during 2009 shutdown • all North RPC-3 frames are ready • All modules produced • 8 half-octants produced, in QA • Crane, grouting, rail finished through PHENIX techs, installation starting PHENIX status of upgrades for run11

  13. Prototype RPC result from 2009 beam data prototype installed in Run9 RPC3 sigma~5.3ns sigma~4.1ns RPC2 μ RPC3 RPC2 beam BG track reconstructed events • 2 prototypes have been installed during 2009 run • typical timing resolution 4 ~ 5 nsec • beam background can be separated • enough timing resolution PHENIX status of upgrades for run11

  14. MuTRG and RPC installation schedule large 500GeV pp run • MuTRG + RPC3 (not including RPC1) can generate trigger signal • the main purpose of RPC1 is the beam background rejection • North MuTRG + RPC3 system will be complete in 2009 • South MuTRG + RPC3 system will be complete in 2010 shutdown • Ready for run 11 PHENIX status of upgrades for run11

  15. Silicon Vertex TrackerVTX: Expected Installation: 2010 PHENIX status of upgrades for run11

  16. Silicon Vertex Tracker (VTX) • Requirements for Detector • Heavy flavor tagging • Good vertex resolution  s < 100mm • Jet reconstruction • large acceptance  |h| < 1.2 and f ~ 2p. • Momentum resolution sp/p ~ 10% • Low material  X0/X < 2.2%/layer in • pixel • Radiation tolerance  1Mrad in 10years VTX Installation to PHENIX Q = c or b Q g • Motivation • Gluon polarization G/G with charm and beautyat low x. • x dependence of G/G with -jet correlations. g Q g q jet g q PHENIX status of upgrades for run11

  17. Silicon Vertex Tracker (VTX) • High spatial resolution : sDCA~ 100 mm 2p for f |h| < 1.2 Inner 2 layer ： pixel detector Outer 2 layer : stripixel detector 4 layers barrel structure pixel full ladder stripixel full ladder 22.7cm 38.3cm • Large acceptance : |h| < 1.2, 2p for f pixel layer r=5.0cm Dz=±10cm r=2.5cm Dz=±10cm stripixel layer r=11.5cm Dz=±16cm r=16.5cm Dz=±19cm PHENIX status of upgrades for run11

  18. PHENIX status of upgrades for run11

  19. Advantage with VTX Detector Simulation Background c quark b quark DCA (mm) pT (GeV/c) charm and beauty separation with difference of their life time e Life time (ct) D0 : 125 mm B0 : 464 mm D  e + X B  e + X DCA D p p B By simultaneous fitting the DCA distribution with the expected shapes, charm and beauty are separated. e Subtraction of background PHENIX status of upgrades for run11

  20. RUN 10 • No pp physics running • Use run 10 for commissioning of: • north RPCs, • south MuTRG and • trigger logic PHENIX status of upgrades for run11

  21. Potential spin physics output from run11 • Assumption: • Ten weeks 500 GeV physics run ~50 pb-1 d • Polarization of 60 % • Usual channels: lower x, more luminosity • Ws in central arms will profit from VTX: • cleaner sample through more tracking points • Heavy flavor/jet veto Increased sensitivity to lower x, relative luminosity will not be limiting systematics at low-Pt PHENIX status of upgrades for run11

  22. Double Spin Asymmetries with VTX Center of mass energy Center of mass energy Integrated Luminosity Integrated Luminosity ALL distribution as function of xg ALL distribution as function of pT PYTHIA Simulation Dg = g Simulation charm bottom Simulation GRSV_std L = 300 pb -1 L = 300 pb -1 P = 0.7 Dg = -g P = 0.7 200mm < DCA pT (GeV/c) include backgrounds xg no backgrounds Heavy flavor measurement Gamma - jet correlation PHENIX status of upgrades for run11

  23. Backward W asymmetries for run11 BUP values PHENIX status of upgrades for run11

  24. What can we expect (prepared for the DSSV challenge) Forward m+ Forward m- Forward m+ Forward m- Backward m+ Backward m- Backward m+ Backward m- Fake reconstructed RB asymmetries for 50 and 150 pb-1 recorded as function of eta with 40 and 50 % polarization respectively, Signal to Background ratio fixed to 3/1, no polarization uncertainty PHENIX status of upgrades for run11

  25. Summary • Muon Trigger upgrade will be ready for run11 • RPCs and MuTRG FEE worked as expected in run9 • good efficiency and momentum-threshold • Readiness for forward/backward W physics • VTX is on schedule to be ready for run11 • Beam tests as expected • Heavy flavor and jet reconstruction capabilities • RUN11: 50 pb-1 and 60% (?) polarization at 500 GeV • W physics in forward/backward and central regions • Gluon polarization via p, gjet and heavy flavor PHENIX status of upgrades for run11

  26. arXiv:0810.0694 x • NLO pQCD calculation of x distribution for 3 0 pT bins. • Sampling of GRSV curves gives sensitivity to DG within measured x range PHENIX status of upgrades for run11

  27. Most recent global analysis : DSSV de Florian et al., PRL101, 072001 (2008) NLO analysis Inclusion of SIDIS data Inclusion of PHENIX p0and STAR jet ALL data (from 200GeV) Using most recent NLO fragmentation functions (DSS) Large uncertainties still for sea quarks Decay data forces Ds to become negative at small x RHIC data results in node to Dg PHENIX status of upgrades for run11

  28. W production as access to quark helicities Maximally parity violating V-A interaction selects only lefthanded quarks and righthanded antiquarks: Having different helicities for the incoming proton then selects spin parallel or antiparallel of the quarks Difference of the cross sections gives quark helicities Dq(x) Testing the spin structure at the W scale without fragmentation functions Large asymmetries to be expected PHENIX status of upgrades for run11

  29. Expected sensitivities in the forward regions • full reconstruction, Backgrounds included, 70% polarization • Signal from RHICBOS (Nadolsky, Yuan ) for recent polarized Parton distribution functions: • DeFlorian, Navarro, Sassot, (including maximally and minimally allowed sea quarks) • Glueck, Reya, Stratmann, Vogelsang • DeFlorian,Sassot, Stratmann, Vogelsang PHENIX status of upgrades for run11

  30. Future improvements • Vertex Detectors (2011-2012) Large acceptance precision tracking • Heavy flavor tagging • Jets • Drell-Yan • Electrons from charm decays and beauty decays separately • c,b-Jet Correlations • Forward Calorimetery (2012-2013) Proposed PHENIX Upgrade ( 1 < eta < 3 ) • AN Pi0, Direct Photon, Gamma-Jet • Full detector simulations in progressIn correspondence with theorists PHENIX status of upgrades for run11

  31. Decay kinematics due to helicity conservation W+ W- PHENIX status of upgrades for run11

  32. Asymmetries and sensitivities Large asymmetries in the forward regions due to the u and d quark polarizations Very different parameterizations in the backward regions due to sea polarizations Large scale to test quark polarizations Pin down sea PHENIX status of upgrades for run11

More Related