PHENIX Future Plans

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PHENIX FuturePlans Upgrades

• Stefan Bathe for PHENIX, Users Meeting 2009

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2008
3
2008
HBD
2009
4
2008
HBD VTX
2009
2011
5
2008
HBD VTX FVTX
2009
2011
2012
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2008
HBD VTX FVTX
2009
2011
2012
FOCAL
2013?
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2008
HBD VTX FVTX
2009
2011
2012
FOCAL
MuTr FEE
2013?
2009/10
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2008
HBD VTX FVTX
2009
2011
2012
RPC
2010/11
FOCAL
MuTr FEE
2013?
2009/10
9
2008
HBD VTX FVTX
2009
Pb absorber
2011
2012
RPC
2010/11
FOCAL
MuTr FEE
2013?
2009/10
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tracking
EMC
0 f coverage 2p
tracking
EMC
MuTrig
MuTrig
MPC
MPC
-3 -2 -1
0 1 2
3 rapidity
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Hadron Blind Detector (HBD)

• Windowless Cerenkov detector with CF4
  avalanche/radiator gas (2 cm pads)

• Designed for low-mass dileptons in AA
• Removes Dalitz and conversion pairs (small
  opening angle)
• Comissioned in Run-9 pp

CsI photocathode covering triple GEMs
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HBD Physics

• Study electron continuum in low Mee region
• Measure in medium-modifications of r, w, ?
• Chiral symmetry restoration
• Measure temperature (internal conversion of
  direct photons)

  arXiv0706.3034
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HBD Performance
Measured in Run-9

• Taking data in Runs 9, 10
• Will be replaced by VTX after Run-10

hadron blind
few pe
background (Dalitz, conversion) 40
photo-electrons
40 pe
Clear separation of signal and background Suppres
sion of background pairs increases effective
statistics by factor 8-16
signal (separated electrons) 40 photo-electrons
20 pe
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Silicon Vertex (VTX FVTX)
VTX barrel hlt1.2

• VTX silicon VerTeX barrel tracker
• Fine granularity, low occupancy
• 50mm425mm pixels for L1 and L2
• R12.5cm and R25cm
• Stripixel detector for L3 and L4
• 80mm1000mm pixel pitch
• R310cm and R414cm
• Large acceptance
• hlt1.2, almost 2p in f plane
• Standalone tracking
• FVTX Forward silicon VerTeX tracker
• 2 endcaps with 4 disks each
• pixel pad structure (75mm x 2.8 to 11.2 mm)

FVTX endcaps 1.2lthlt2.7 mini strips
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VTX Physics

• Heavy Flavor as probe of dense partonic matter in
  AA
• RAA(pT) of single electron from charm decay and
  beauty decay separately
• v2 (pT) of single electron from charm decay and
  beauty decay separately
• Jet tomography (di-hadron, g-hadron, and c-hadron
  correlation)
• Gluon polarization DG(x) in polarized pp
• Double spin asymmetry ALL of heavy flavor
  production (charm and beauty, separately)
• ALL of g-jet

PRL 98, 172301 (2007)
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VTX Performance
Expected with VTX (0.4/nb 3 weeks in RUN11)

• Strong suppression of single electrons from heavy
  flavor is one of most surprising results
• Present measurement is mixture of b and c
• VTX can separate b and c

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VTX Progress
Pixel Detector Ladder
Successful DOE review this week
Pixel read-out
Test Beam at FNAL
Installation in 2010
Strip read-out
Strip Detector Ladder
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FVTX Physics Schedule
Prototype DAQ Electronics
Without FVTX

• adding high resolution tracking points for muons
  ahead of the hadron absorber
• utilized together with muon arm tracks
• quarkonium spectroscopy to probe color screening
  in medium
• Single muons
• Background suppression for direct photons in
  FOCAL
• Installation for Run-12

With FVTX
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The W
Energy v.s. Inclination of the track

• W program has started
• Central arm ready for W measurement at
  mid-rapidity
• Backward/forward measurement needs upgrade

W candidates, PHENIX Run-9, pp_at_500 GeV
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(No Transcript)
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Muon Trigger
Rapidity 1.2 lt h lt2.2 (2.4)
Animation by Kenichi Karatsu

• MuID
• - only existing trigger
• no momentum selectivity..

• ltMuon Trigger Upgradegt
• MuTr FEE Upgrade (MuTRG)
• Install RPC (Resistive Plate Chamber)
• Install additional Pb absorber

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MuTrig Status

• MuTr.N operational for Run-9
• Good efficiency

• Engineering run for sectors in 2 RPC planes on
  south arm
• Timing resolution helped understand background
  already now

From collision or out going beam
From beam background
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Muon Trigger Physics W

• W parity violating
• Single (longitudinal) spin asymmetry
• W selects (anti-)quarks with negative (positive)
  helicity in polarized beam
• Lepton rapidity determined by x of valence and
  sea quark as well as helicity of neutrino
• Polarization of sea quarks

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W sensitivity
(l pTgt20 GeV)
(l- pTgt20 GeV)
Muon Arms trigger upgrade is ongoing ? will be
ready for next 500 GeV run
Central Arms ready for W measurement
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FOrward CALorimeter (FOCAL)

• Tungsten absorber with silicon pad readout
• 1lt h lt3
• 2 p azimuth
• 24 X0 deep
• 3 layers pad readout for lateral and longitudinal
  shower profile
• Reject hadronic background
• Si strips within first X0 for g/p0 ID

6cm
17 cm
85 cm
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FOCAL Physics

• Trigger on neutral pions and photons
• Provide coincidence measurements with central arm
• Constrain kinematics (x)
• pp
• Low x gluons
• Transverse spin physics
• dAu
• Gluon saturation in nucleus
• Pin down initial state in HI collisions
• AuAu
• g-jet

Geant simulation 20 GeV p0
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FOCAL Status

• RD ongoing

Test beam
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DAQTRIG2010 Upgrade

• Future
• 7MHz pp_at_500GeV
• 2MHz pp_at_200GeV
• 40kHz AuAu
• Event size 1.7 with Si detectors
• ?Previous trigger strategy wont work

• Currently
• DAQ 5kHz bandwidth
• Up to Run-7, PHENIX able to record every AuAu
  mbias event (in Run-7 80 of 7 kHz)
• In pp, Lvl1 triggers reduce 200-400 kHz rate to
  6kHz of useful events
• ?PHENIX able to effectively sample full
  luminosity for all rare channels

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DAQTRIG2010 Upgrade

• Possible solutions
• Replace 10-year old EMCal electronics
• Medium-scale upgrade to DAQ
• e.g. upgrade central data switch to 10 Gigabit
  networking
• Various other small upgrades
• BBC w/ multiple vertex selection
• MuID Trigger FPGA upgrade
• VTX integration trigger

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Timeline
RHIC PHENIX RUN9 First 500 GeV pp mTrig FEE
(half) long 200 GeV pp RUN10 stoch. cooling
2 mTrig FEE(full) mTrig RPC(South) RUN11 EBI
S (UU) VTX mTrig RPC(North) RUN12 56 MHz
RF FVTX (electron lensing?) RUN13 (e
cooling AGS?) (Forward Cal?)
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Energy Scan

• Physics
• How do dilepton excess and r modification at SPS
  evolve into large low-mass excess at RHIC?
• opacity of the produced medium, elliptic flow
• onset of perfect liquid properties
• Search for critical point
• Search for 1st order phase transition

• PHENIX seriously looking into low energy running
• Low energy task force founded reported in May
• Suggestion to focus at first between full and
  injection energy
• Opportunity to investigate dileptons in new
  energy regime with HBD

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Beyond the next couple years . . .

• Transverse spin physics to understand nucleon
• pA to understand initial state of HI collisions
• DG with direct g and g-jet in high luminosity 200
  GeV pp (cleaner than p0)
• g-h, g-jet in high-luminosity AuAu to measure
  modification of fragmentation function
• . . .

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Conclusions

• PHENIX has healthy upgrade program to carry
  current exciting results to further understanding
• Immediate plans (next two years) determined by
  upgrade installation schedule (HBD, VTX)
• Successful physics program relies on sufficient
  funding for 10 weeks each of HI and Spin running
  each year
• Many opportunities for immediate and long-term
  future

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2008
HBD VTX FVTX
2009
Pb absorber
2011
2012
RPC
2010/11
FOCAL
MuTr FEE
2013?
2009/10