star’s upgrades – a path to the future helen caines yale university rhic/ags users meeting

STARs Upgrades A Path to the Future

Helen CainesYale University

RHIC/AGS Users MeetingMay 2008Workshop on RHIC UpgradesOutline:Just UsedInstalled for Run 9Under ConstructionContemplating

Helen Caines RHIC/AGS Users Meeting - RHIC Prospects May 2008

STARs detector upgradesMRPC ToF barrelReady for run 10RPSDPMDFPDFMSEMC barrelEMC End CapDAQ1000Ready for run 9HFT; FGT: GEM-layers finishedongoingMTDR&D*


STARs coverage*Photon capability from none to 4p


Aim to keep the discoveries rolling DAQ1000 Upgradeorder of magnitude increase in rate (1KHz)extra livetime opens the door to rare physicsFull Barrel MRPC TOFextended hadron identification at intermediate pTLepton identification at low momentum

Heavy Flavor TrackerHigh precision Silicon tracker near the primary vertexOpens door to direct topological charm and beauty reconstructionForward GEM TrackerEnd cap tracker for particle sign determination for W

Muon Telescope (BNL LDRD)Forward Reaction Plane DetectorA Crystal Calorimeter for low E photons Pb converter for - HBT GEM alignment detector UnderwayR&D/ProposalsMore ideas*

Ready for Run 9/10*


DAQ 1000 - TPC FEE and DAQ upgrades*Faster, smaller, better ( 10x )

Current TPC FEE and DAQ limited to 100 Hz. Replace TPC FEE with next generation CERN based chips 1 kHz readout

Zero suppression done at FEE. 16-20x smaller

Make the FEE smaller. less heat Almost no deadtime rare physics program

By only archiving associated clusters build on L3 algorithms 5 kHz !Prototype in run 7, 1 sector in run8, Full system in run9 TPC is now a fast detector!!!


1/17/2008 Laser event (plus pileup)Data from DAQ1000 sector look goodTPX dE/dx from TOF+TPX events

DAQ1K at 1000Hz, 57% deadtimeCommissioning in run 8*


PID plays crucial roles at RHIC*


Multi-gap Resistive Plate Chamber Time-of-FlightState-of-art MRPC: -0.9

*Proposal In, Construction Starting


Poor mans open heavy flavor measurements*Electrons: EMC: pT>2 GeV/c TOF+TPC: 0.290% out to = 1.8)See Bernds talk later*


Current upgrade timeline*Run08Run10Run09Run12Run11Run13Run15Run14FMS complete:d+Au and p+pdata from Run 8DAQ1000 completeImmediate improvementof 300% in sampled luminosity for rare probes(e.g. jets in p+p)Increase in Au+Au luminosity to50 x 1027 cm-2 sec-1U+U available from EBISDOE investment ~ $7MHFT partial implementation

HFT completefull topological PID forc, b mesonsDOE investment : upperlimit of range ~ $14.7M

Planned LHC1st heavy ion runDOE investment ~ $400k DOE investment ~ $1900kTOF complete:PID information for > 95% of kaonsand protons in the STAR acceptanceClean e ID down to 0.2 GeV/cDOE investment ~ $4900kChinese investment ~ $2700k

FGT complete:Accurate charge sign determinationfor Ws, DOE investment ~ $1900k

Ideas in germination*


Ideas in Germination*Photon converter gg HBT for direct photons Muon Telescope DetectorJ/y trigger GEM CalibrationHigh pT resolutionReaction Plane DetectorImproved resolution for v2 measurementsOnline trigger trackingTriggering and data reduction


Direct g HBT*Direct gs:Produced in all stages of collision.Emitted without re-scatteringDirectly sensitive to T evolutionSwamped by p0 decay bkgrd.

Analysis challengingHowever HBT correlations only exist between direct photons. Correlation peak gives direct photon yield down to low pT

Importantly, HBT gives information on temperature vs. size development through all stages of collision!Simulations show that a real measurement is possible in STAR with minimum addition (converter).


The photon converter*10% radiation length Pb photon converter at R~43 cm (inside TPC)

Converter retractable so that for most of the run it would not interfere with tracking in |h|100)

1 hit per 5 head-on Au+Au Dimuon trigger (>25)

Large coverage: diameter of 7 metersA BNL 2007 LDRD project J/y trigger, separate +- statesFull Hijing AuAu event


Performance in STAR * z distribution of matched MTD hits has two components: narrow (m) and broad (hadron) ones from data: pT>2 GeV/c, (z) of muon: ~10 cm from simu: pT=2.5 GeV/c, (z) of muon: ~9 cm

hadron rejection: 200-300 (via track matching) time resolution: 300 ps Improve our electronics for full scale detectorSimulationsm

pData z (cm)pT (GeV/c)


Novel Problems just around the corner*Can we understand the distortion at high luminosity and maintain the momentum resolution?

Can we analyze all the data from DAQ1000 effectively?

Can we improve our reaction plane, especially at low energies?


GEM alignment detector* As luminosity increases the TPC distortions due to residual charge in chamber increase. Resolution Focus on high pT Vital that we can correct for these distortions on track-by-track basis Capitalize on GEM technology and readout developed for FGT and place a few detectors outside of TPC radius Measure precise points (~100 mm) on tracks at outer radius of TPC in strategic locations to provide a strong constraint on the space charge distortion corrections.


Online tracking for high pT charged hadron*DAQ1000, 12 weeks, 50% data-time, 1000Hz: 3.63 billion events, how to handle????

Central 0-5%: pT>4 GeV/c, (h++h-) raw yield: 6.52e-02 per event, 236M evts pT>5 GeV/c, (h++h-) raw yield: 1.37e-02 per event, 50M evts pT>6 GeV/c, (h++h-) raw yield: 4.15e-03 per event, 15M evts

p+p: pT>4 GeV/c, (h++h-) raw yield: 3.10e-04 per event, 1.13M evts pT>5 GeV/c, (h++h-) raw yield: 6.52e-05 per event, 237K evts pT>6 GeV/c, (h++h-) raw yield: 1.97e-05 per event, 72K evts

Needs ~20% primary track momentum resolution at 5 GeV/cEMC and GEM Patches for calibration online?


Seeds from EMC+TOF for Dilepton tracking*Dielectron and background rates for TPC+TOF+EMC+Online

Events needed could be reduced from ~1billion to 1.00.3110>1.50.06278>2.00.0164000


Forward ToF detector*MRPC ToF rings at forward rapidity 2.75

star’s upgrades – a path to the future helen caines yale university rhic/ags users meeting

Documents

rhic upgradesoutline

ebisdoe investment

gevcdoe investment

kchinese investment

current tpc fee

fee smaller

b mesonsdoe investment

run9 tpc