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Muon Spectrometer Upgrade

Muon Spectrometer Upgrade. Physics Motivation. o W-physics: Increase the rejection of the single muon trigger to 10 4 (design: 10 3 , observed: 10 2 ). o Gluon saturation at small x in d-Au: Extension of the kinematic range for direct photon production to small x.

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Muon Spectrometer Upgrade

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  1. Muon Spectrometer Upgrade Physics Motivation o W-physics: Increase the rejection of the single muon trigger to 104 (design: 103, observed: 102). o Gluon saturation at small x in d-Au: Extension of the kinematic range for direct photon production to small x. o  first level trigger for Heavy Ion Physics o Increase stability of muon trigger against beam related backgrounds. Components of the upgrade Front electronics and trigger People and Schedule Matthias Grosse Perdekamp, RBRC and UIUC

  2. Physics Motivation W Production in pp Level 1 trigger in AA Gluon Saturation in dA Measure the A-dependence of the gluon distribution at small x: o Survey the dependence of nucleon structure on the nuclear environment. o Search for gluon saturation at small x: 10-3<x<10-2 o Survey initial state for HI high pT physics. Study color screening effects associated with QGP production in  quarkonium states: The seperation of the (1S) state from the (2S) and (3S) states requires good invariant mass resolution (100MeV) and requires long runs at as high as possible integrated luminosity.

  3. Projected Rates in pp: Level 1 Channel Rates electron trigger 4kHz (EMCxRICH, E>1.5GeV) R=3000 photon trigger (EMC>3GeV) 0.3kHz R=40000 Jet (EMC Multiplicity) 6kHz single muon 17.6kHz (muId deep muon) R=570 Others 2kHz Total 29.9kHz PHENIX bandwidth 12kHz (->24kHz for $2M) o rate from level 1 should stay below about 7-8kHz o can pre-scale electron trigger and jet trigger by factors 2-3 (as event samples are going to be several 106 events). o W sample is about 104. o Maschine Luminosity will increase over several years (first 500 GeV production run: Time scale to fix the trigger problem is 3-5 years. o Ken Reed et.al and Jamie Nagle et al. found “default R(uId)” of about 1000. o We do not have a reliable estimate of beam related background in the muon trigger. o need additional rejection of 10-50 depending on the beam background trigger rate.

  4. Upgrade Components: Pad Chamber II Muon from hadron decays Jet vs W Muon from W Nosecone Calorimeter Pad Chamber I Hodoscope I Hodoscope II Cerenkov Nosecone calorimeter -> dA: low x, pp: W-tag, b-tag Pad Chambers+uID -> high momentum lepton and di-lepton trigger for pp, AA hodoscopes+uID -> pp: W-tag Cerenkov+uID -> AA:  trigger, beam gas rejection pp: W-tag Muons from hadrons Muons from Ws pmuon

  5. Pad Chamber: Amp/Disc Cathode plane 360 azimuthal strips made as an digital .OR. of individual pads .OR. 2 mm pitch proportional wire chamber for gain amplification

  6. Example: Single Muon Trigger Rejection Level 1 Tracking: Hodoscope + muID Road Level 1 Threshold: Cerenkov + muID Road raw decay muons raw decay muons with muID lvl1 with muID lvl1 with tracking with Cerenkov Rejection: 3.7 Rejection: 36 Pythia and PISA simulation by Greg ver Steeg and Jennifer Hom

  7. Example: N-EMC, kinematic coverage More than 100 events in bin width logx=0.1 More than 103 events in bin width logx=0.1 More than 104 events in bin width logx=0.1 More than 105 events in bin width logx=0.1 Pythia simulation by Rich Seto

  8. Channel Counts for one Muon Arm Timing Pattern Pulse Height

  9. (1) Time Schedule : a) first 500 GeV run in 2005: (low luminosity) b) max. Luminosity in 2006 or 2007 (2) Menu of possible upgrades: a) new LL1/L1.5 electronics b) two tracking hodoscopes c) two pad chambers d) segmented nosecone calorimeter e) Cherenkov (3) Interested groups: o RBRC (Brendan, Abhay) o Kyoto (Naohito) o RIKEN (Atsushi) o Columbia (Chi) o UCR (Ken, Rich, Wei) o UIUC ( JCP, MGP) o Iowa (John Lajoie) o UNM (Doug) (4) Funding: a) RIKEN/RBRC b) Kyoto (requested R&D funding) c) UIUC ($200k) d) NSF MRI grant: Consortium of UIUC and UCR University : December NSF : December/January Plans:

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