PHENIX Future Plans & Upgrades

transcript

PHENIX FUTUREPLANS & UPGRADES

Stefan Bathe for PHENIX, Users’ Meeting 2009

Users’ Meeting 2009Stefan Bathe2

HBDVTX

20092011

HBDVTXFVTX

200920112012

HBDVTXFVTX

200920112012

HBDVTXFVTX

FOCAL MuTr FEE

200920112012

2013? 2009/10

HBDVTXFVTX

FOCAL MuTr FEE

200920112012

2013? 2009/10

2010/11

HBDVTXFVTX

FOCAL MuTr FEE

Pb absorber

200920112012

2013? 2009/10

2010/11

Users’ Meeting 2009Stefan Bathe10M

VTX & FVTX MPCMPC

-3 -2 -1 0 1 2 3 rapidity0

FOCALFOCAL

MuTrig MuTrig

Hadron Blind Detector (HBD)

Users’ Meeting 2009Stefan Bathe

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

Cherenkov blobs

partner positronneeded for rejection e+

qpair openingangle

Designed for low-mass dileptons in A+A

Removes Dalitz and conversion pairs (small opening angle)

Comissioned in Run-9 p+pCsI photocathode covering triple GEMs

HBD Physics

Study electron continuum in low Mee region

Measure in medium-modifications of r, w, f

Chiral symmetry restoration

Measure temperature (internal conversion of direct photons) arXiv:0706.3034

HBD Performance

Clear separation of signal and background

Suppression of background pairs increases effective statistics by factor 8-16

Taking data in Runs 9, 10

Will be replaced by VTX after Run-10

~40 pe

~20 pe

few pe hadron blind

background (Dalitz,

conversion): 40 photo-electrons

signal(separated

electrons): 40 photo-electrons

Measured in Run-9

Silicon Vertex (VTX & FVTX)

VTX: silicon VerTeX barrel tracker Fine granularity, low occupancy

50mm×425mm pixels for L1 and L2 R1=2.5cm and R2=5cm

Stripixel detector for L3 and L4 80mm×1000mm pixel pitch R3=10cm and R4=14cm

Large acceptance |h|<1.2, 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 endcaps1.2<|h|<2.7 mini strips

VTX barrel |h|<1.2

VTX Physics

Heavy Flavor as probe of dense partonic matter in A+A

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 p+p

Double spin asymmetry ALL of heavy flavor production (charm and beauty, separately)

ALL of g-jetPRL 98, 172301 (2007)

VTX Performance

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

Expected with VTX (0.4/nb ~3 weeks in RUN11)

VTX Progress

Pixel Detector Ladder

Strip Detector LadderStrip read-out

Pixel read-out Test Beam at FNAL

Installation in 2010

Successful DOE review this week

FVTX Physics & Schedule

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

Without FVTX

WithFVTX

Prototype DAQ Electronics

Energy v.s. Inclination of the track

W candidates, PHENIX Run-9, p+p@500 GeV

W program has started

Central arm ready for W measurement at mid-rapidity

Backward/forward measurement needs upgrade

MuID- only existing trigger- no momentum selectivity..

<Muon Trigger Upgrade>• MuTr FEE Upgrade (MuTRG)• Install RPC (Resistive Plate Chamber)• Install additional Pb absorber

Rapidity: 1.2 < h <2.2 (2.4)

Basic Idea:Measure Δstrip in online level-> more momentum selective trigger

Muon Trigger

Animation byKen’ichi Karatsu

MuTrig Status MuTr.N

operational for Run-9

Good efficiency

From collision orout going beam

From beambackground

Engineering run for sectors in 2 RPC planes on south arm

Timing resolution helped understand background already now

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

W sensitivity

24Central Arms: ready for W measurement

Muon Arms: trigger upgrade is ongoing will be ready for next 500 GeV run

(l- pT>20 GeV)

(l+ pT>20 GeV)

FOrward CALorimeter (FOCAL)

Tungsten absorber with silicon pad readout 1< h <3 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

FOCAL Physics

Trigger on neutral pions and photons

Provide coincidence measurements with central arm

Constrain kinematics (x) p+p

Low x gluons Transverse spin physics

d+Au Gluon saturation in nucleus Pin down initial state in HI

collisions Au+Au

pA physics – nuclear gluon pdf

Geant simulation20 GeV p0

FOCAL Status R&D ongoing

Test beam

DAQTRIG2010 Upgrade Currently

DAQ 5kHz bandwidth Up to Run-7, PHENIX able

to record every Au+Au mbias event (in Run-7: 80% of 7 kHz)

In p+p, Lvl1 triggers reduce 200-400 kHz rate to 6kHz of useful events

PHENIX able to effectively sample full luminosity for all rare channels

Users’ Meeting 2009-Stefan Bathe

Future 7MHz p+p@500GeV 2MHz p+p@200GeV 40kHz Au+Au Event size *1.7 with Si

detectors

Previous trigger strategy won’t work

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

Timeline

RHIC PHENIXRUN9 First 500 GeV pp mTrig

FEE (half)long 200 GeV pp

RUN10stoch. cooling 2 mTrig FEE(full)

mTrig RPC(South)

RUN11EBIS (U+U) VTX mTrig

RPC(North)RUN1256 MHz RF FVTX

(electron lensing?)RUN13(e cooling AGS?) (Forward

Energy Scan 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

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

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 p+p (cleaner than p0)

g-h, g-jet in high-luminosity Au+Au to measure modification of fragmentation function

. . . Users’ Meeting 2009Stefan Bathe

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

HBDVTXFVTX

FOCAL MuTr FEE

Pb absorber200920112012

2013? 2009/10

2010/11

PHENIX Future Plans & Upgrades

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