1 / 20

The PHENIX Forward Upgrade

The PHENIX Forward Upgrade. Topics: A (Brief) Spin Physics Motivation Antiquark Spin Contribution with W +/- bosons The PHENIX Detector RPC Detectors and Level-1 Trigger Upgrade.

neil
Download Presentation

The PHENIX Forward Upgrade

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. The PHENIX Forward Upgrade Topics: A (Brief) Spin Physics Motivation Antiquark Spin Contribution with W+/- bosons The PHENIX Detector RPC Detectors and Level-1 Trigger Upgrade University of Illinois, Abilene Christian, Iowa State University, UC Riverside, University of Colorado, Nevis Laboratory, Riken-BNL Research Center, University of Kyoto, Peking University J. Lajoie - PANIC '05

  2. 3 valence quarks + gluons + virtual quark-anti-quark pairs charge momentum mass spin gluon spin ? orbital angular mom. quark spin Includes contributions from the quark sea The Proton as viewed with a high energy (short wavelength) probe as viewed with a low energy (long wavelength) probe 3 valence quarks  charge momentum mass spin u ? u d 10-15 m Using spin we can probe the structure of the proton! J. Lajoie - PANIC '05

  3. Flavor separation of the spindependent quark and anti-quark distributions in pp collisions @500GeV For W- interchange u and d. Parity violation of the weak interaction in combination with control over the proton spin orientation gives access to the flavor spin structure in the proton! Experimental Requirements:  tracking at high pT  good rejection of backgrounds in analysis.  event selection for muons difficult due to background muons from hadron decays and beam backgrounds (timing resolution!). W Z J. Lajoie - PANIC '05

  4. PHENIX Spin Physics Program: ∆g, ∆q/q, ∆q/q, δq • 2 central arms: electrons, photons, hadrons • charmonium J/, ’ -> e+e- • vector mesonr, w,  -> e+e- • high pTpo, p+, p- • direct photons • open charm • hadron physics • 2 muon arms: • “onium” J/, ’,  -> m+m- • vector meson -> m+m- • open charm Excellent trigger and DAQ capabilities: multiple trigger signature important for spin physics can be taken in parallel with high bandwidth! J. Lajoie - PANIC '05

  5. Existing MuID Level-1 Trigger Logical tubes formed by OR of physical tubes across panels in each gap. Rejection Factor ~500 @ 200 GeV/c The most probable trajectory for a vertex muon striking a gap-1 logical tube is to continue on a path of equal dx/dz (vertical tubes) or dy/dz (horizontal tubes). Tubes w/ the same dx/dz (or dy/dz) get the same index. J. Lajoie - PANIC '05

  6. PHENIX Muon Trigger Upgrade • Three dedicated trigger RPC stations (CMS design): • R1 and R2: 360 Φ-columns of 24 θ pad 8640 ch. • R3: 384 ~ 30x30cm2 pads • (II)muTr front end electronics R2 R3 R1 NSF (Funded $2M) r=3.40m JSPS Goals: (a) W-trigger (b) pattern recognition r=100-120cm Rejection Factor >10,000 required! J. Lajoie - PANIC '05

  7. Resistive Plate Chambers • good timing performance comparable to that of scintillator (~ 1-2 ns) • space resolution sufficient for muon trigger purpose (~ cm ) • simple design & low cost • arbitrary readout geometry • good rate capability (~several kHz/cm2) • RPC’s have been used in L3, BaBar, Belle experiments. • All 4 LHC experiments will use RPC for muon system. • STAR and PHENIX used MRPC as TOF J. Lajoie - PANIC '05

  8. Muon road ID Trigger Algorithm (RPC) ()=angle I – angle II: momentum cut Uncorrelated noise rate should be < 10Hz/cm2. RPC1 resolution ~0.4cm J. Lajoie - PANIC '05

  9. coming from front (in time hits) R1 coming from back (early time hits) R3 R2 Beam-Background Rejection • Severity of beam backgrounds at 500GeV (with high luminosity) is largely unknown. • RPC timing used to eliminate early-time hits. • Trigger rejection largely independent of beam-related backgrounds. Collisions! Beam-Related Background J. Lajoie - PANIC '05

  10. Physics Timeline see Spin report to DOE http://spin.riken.bnl.gov/rsc/ L= 1x1031cm-2s-1 6x1031cm-2s-1 1.6x1032cm-2s-1 P= 0.5 0.6 0.7 …………………………………… √s= ……………………….. 200 GeV …………………......... 500 GeV| 2005 2006 2007 2008 2009 …. 2012 (RHIC II) 10 pb-1 …………………………………… 275pb-1 …….. 950pb-1 @ 200GeV @ 500GeV Inclusive hadrons + Jets ~ 25% Transverse Physics Charm Physics direct photons bottom physics W-physics ALL(hadrons, Jets) ALL(charm) AL(W) ALL(γ) J. Lajoie - PANIC '05

  11. PHENIX ALW+/-Sensitivity • Machine and detector requirements: • ∫Ldt=800pb-1, P=0.7 at √s=500 GeV • Muon trigger upgrade! 2009 to 2012 running at √s=500 GeV is projected to yield ∫Ldt ~950pb-1 J. Lajoie - PANIC '05

  12. Summary • The “Spin Crisis” is an opportunity to use spin to probe the structure of the proton! • The polarized proton program at RHIC will address two key missing pieces of information through W+/- production: • The antiquark spin structure functions • The PHENIX Forward Upgrade will provide the event selection necessary to access this physics: • New RPC-based tracking chambers. • New Level-1 Muon Trigger. J. Lajoie - PANIC '05

  13. BACKUP J. Lajoie - PANIC '05

  14. OR OR OR OR OR OR MuID LL1 Symset Logic 1A 2A 3A 4A • Either gap 0 or gap 1 • Either gap 3 or gap 4 • Three or more hit gaps • Expected 1D rejection ~500 0B 1B 2B 3B 4B 1C 2C 3C 4C AND S>2 deep J. Lajoie - PANIC '05

  15. Polarized p-p at RHICA New Experimental Method for the Study of Proton Structure RHIC pC Polarimeters Absolute Polarimeter (H jet) Siberian Snakes BRAHMS & PP2PP PHOBOS Siberian Snakes Spin Flipper PHENIX STAR Spin Rotators Partial Snake Helical Partial Snake Strong Snake Polarized Source Run 05 LINAC AGS BOOSTER 200 MeV Polarimeter <Pb> = 50% Rf Dipole AGS Internal Polarimeter AGS pC Polarimeter J. Lajoie - PANIC '05

  16. Generic LL1 Board Design (ISU) Fiber Bus Termination 1.8V Regulator Fiber Transceiver/GLINK VME Interface JTAG Connector Xilinx FPGA Logic J. Lajoie - PANIC '05

  17. Existing MuID LL1 System Another quality product from Iowa State University! accepted event data 16 bits GL1 data blue logic triggers (4 bits per arm shallow/deep) Global Level-1 MuID LL1 backplane backplane GL1-1P GL1-3 GL1-1 GL1-2 GenLL1 GenLL1 20 horizontal fibers 20 vertical fibers 40 Gbit/s per arm! J. Lajoie - PANIC '05

  18. 20 fibers @ 6xBCLK 16-bit backplane bus LL1 Block Diagram (RPC+MuTR) LL1 Block Diagram (RPC) • Key issue is to get the MuID LL1 information into the new LL1’s. New Muon Trigger “LVL1.5” (single board does all) New Muon Trigger “LVL1.5” (each board does two octants) VME crate 40 fibers @ 6xBCLK 56 (48) fibers @ 6xBCLK MuTR 20 Fibers @ 6xBCLK RPC Existing MuID LL1 System J. Lajoie - PANIC '05

  19. W+ Production in p + p Collisions Weak interaction violates parity – quark/antiquark helicities fixed! (left-handed quarks) (right-handed antiquarks) J. Lajoie - PANIC '05

  20. Strips at Station 1 Strips at Station 3 Strips at Station 2 accept Dstrip<=1 Trigger Algorithm (MuTR) INPUT: single m 15GeV/c vertex z=0 Dstrip :Sagitta at station 2 J. Lajoie - PANIC '05

More Related