•STARSTAR

Current and future upgrades in STAR

Flemming Videbaek

BNL

•STARSTAR

Overview• Introduction• Ongoing or recently completed upgrades

– TOF, completed– Forward Gem Tracker – in construction– HFT- on the Critical Decision path

• Proposed upgrades for physics– Muon Telescope Detector (MTD)– High Level Trigger (HLT)– Pp2pp phase-2– Forward Hadron Calorimeter (FHC)

• Status and plans for TPC– TPC in high luminosity era– GEM Calibration Detector

• STAR planning

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•STARSTAR

Introduction

• STAR is planning for the future – next decade plans for HI and pp.

• Ensure vibrant physics program through a continued upgrade program.

• Sure that you will hear more about the pp and spin related physics that can be done with particular the Forward Gem Tracker, and the proposed Forward Hadron Calorimeter and the Roman Pot phase-2 upgrade (aka pp2pp)

• Obviously this will be brief.

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•STARSTAR STAR Detector (current)

4

•MRPC ToF barrelMRPC ToF barrel•100% ready for run 10100% ready for run 10

•PMD

•FPD

•FMS

•EMC barrel

•EMC End Cap

•DAQ1000DAQ1000

•Complete

•TPC

•FTPC

•BBC

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•STARSTAR •STAR Detector

•MRPC ToF barrelMRPC ToF barrel•100% ready for run 10100% ready for run 10

•BBC

•PMD

•FPD

•FMS

•EMC barrel •EMC End Cap

•DAQ100DAQ10000

•FGT

•Completed

•Ongoing

•MTD

planned•HFT

•TPC

•FHC

•HLT511/20/09 RSC - LBL

pp2pp

•STARSTAR

Time-Of-Flight

• Project completed with installation of all 120 trays, ready for large acceptance PID.

• Extends electron, ,K, and p identification to large pt-range particular in combination with dE/dx from the TPC.

• di-electrons, Heavy Flavor, Beam Energy Scan

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•

Physics MotivationExtend quark/anti quark polarization measurements to 1< <2 by providing charge separation for e+- via high precision tracking in front of EMC end cap.

Schedule

Goal: Complete FGT construction in ~fall 2010 followed by full system test and subsequent full installation in ~summer 2011 Ready for anticipated first long 500GeV polarized pp ⇒run in FY12

Construction well underway

Forward Gem TrackerForward Gem Tracker

•

FGT Technical realizationFGT Technical realization

Layout

FGT: 6 light-weight disks in the West part of the IFC.

Each disk consists of 4 triple-GEM chambers (Quarter sections)

•FGTFGT

Procurement and assembly of

full quarter section prototype

in preparation

•STARSTAR

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Heavy Flavor Tracker upgrade Heavy quark is one of the ideal probes to quantify the

properties of the hot dense medium created in relativistic heavy ion collisions.

Heavy quark program at RHIC/STAR is underway. Present physics conclusions are rather qualitative.

With detector upgrades, STAR will be able to perform precision measurements on open charm and bottom measurements in p+p, p(d)+A, and A+A collisions.

Precision measurements via direct reconstruction of displayed vertices and particle identification over 2pi covering low and high pT

•2 •3•0.5

•~ 30 microns pointing resolution at 0.7 GeV/c

•~ 30 microns secondary vertex resolution (large p)

SSD (existing double sided strip detector) is the outer layerIST is a layer of silicon strip PIXEL is 2 inner layers of high resolution •Pixel (MAPS) (18*18 m) and thin ~0.4% Xo per layer

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Physics Projections with HFT+TOF

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•Charm collectivity => Medium properties, light flavor thermalization

•LambdaC

•ΛC ( p + K + π):

Lowest mass charm baryon

Total yield and ΛC/D0 ratios can be measured.

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•STARSTAR HFT status

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• R&D for the pixel sensors, readout and support structure has been successfully carried out over several years.

• Design and layout is mature. • CD-1 review November. Following anticipated CD-1

approval, preparing for base-lining of project with review 6-8 months from now.

• Challenging to have complete system ready for run-14.• Limited capabilities for p+p 500 GeV due to expected

radiation levels for the inner most PXL layers (removal), though outer IST and SSD will add fast tracking information at mid-rapidity.

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MTD Muons: Penetrating Probes A large area of muon telescope detector (MTD) at mid-rapidity, allows for the detection of

• di-muon pairs from QGP thermal radiation, quarkonia, light vector mesons, possible correlations of quarks and gluons as resonances in QGP, and Drell-Yan production • single muons from their semi- leptonic decays of heavy flavor hadrons• advantages over electrons: no conversion, much less Dalitz decay contribution, less affected by radiative losses in the detector materials, trigger capability in Au+Au

+-

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Technical Implementation

Detector with long-MRPCs covering the whole iron bars and left the gaps in-between uncovered. Acceptance: 35 (53) % at ||<0.8

117 (180) modules, 2160 readout strips, 4320 readout channels

Long-MRPC detector technology, HPTDC electronics (same as STAR-TOF)

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Summary of what have been done for the R&D• Cosmic and beam tests:

intrinsic timing resolution of long MRPC: ~60-70 ps

spatial resolution: ~1 cm

results have been summarized and published at Y. Sun et al., nucl-ex/0805.2459;

NIMA 593, 430 (2008)

• The prototype of MTD works at STAR. We observed:

---- clear narrow muon peak

---- Muon purity can be achieved >80% • The primary muon over secondary muon ratio is good for quarkonium

program• The trigger capability with L0 and L2 is promising for dimuon

program: Upsilon, J/ elliptic flow v2 and RAA at high pT Results at STAR have been summarized and published at L. Ruan et al., 0904.3774,

Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001

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•STARSTAR

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Physics with High Level Trigger

The HLT enhances the physics analysis by selecting events The HLT enhances the physics analysis by selecting events

of interest in near real time, and filter for events written to of interest in near real time, and filter for events written to

tape.tape.

Some ExamplesSome Examples

- The study of heavy flavor production and collective flow that will The study of heavy flavor production and collective flow that will

profoundly enhance our understanding of the properties of the profoundly enhance our understanding of the properties of the

produced Quark Gluon Plasma and the associated phase produced Quark Gluon Plasma and the associated phase

transition.transition.

- The study of di-lepton mass spectrum that helps us understand The study of di-lepton mass spectrum that helps us understand

the thermal radiation and constrain the initial temperaturethe thermal radiation and constrain the initial temperature

- J/Psi measurements at high pJ/Psi measurements at high pTT

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The set-up of HLT

SL3 : Sector Level 3, Sector clustering and trackingGL3 : Global Level 3, Event assembling and trigger decision making.

SL3SL3 SL3SL3

SL3SL3

GL3GL3

Total 24 SL3 machines

BEMCBEMCOther Sub

Systm.

Other Sub

Systm.

Run 9 p+p 200 GeV, May 19 - 25

This thing works !J/ψ counts seen with HLT in a few days exceeds the total counts seen by STAR previously in year 2006.

Forward Upgrade (FMS)Proposed Forward Hadron Calorimeter

Physics Objectives

• Transverse single spin asymmetry measurements for forward jet production

• Tests of future polarization measurements for large xF production

North FMS half 632 lead-glass detectors in 2m1m array

Existing

map

1 of 2 hadron calorimeter modules at IP10 for 912 array

of AGS-E864 detectors

Proposed

Forward Jets with FMS + FHCMeasuring the Jet Energy

• Detectable hadrons and photons within acceptance of FMS+FHC are used for summed-energy trigger and for cone-based jet reconstruction.

• Photon-only jets do not measure the scattered parton energy.

• Combining hadronic + EM energy does measure the scattered parton energy, limited mostly by fragmentation effects.

• Many jets are not particularly “jetty”, meaning only few hadrons are within the acceptance. Jets with few hadrons do not give a good measure of the scattered parton energy. Invariant mass from the FMS+FHC can discriminate “jetty” versus “non-jetty” fragmentations.

FMS

+

FHC

FMS

only

•STARSTAR

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Glueball Search and Diffractive Physics Program with the STAR Detector at RHIC and

Roman PotsPHASE II of the Physics with Tagged Forward Protons Program with the STAR Detector at RHIC

p + p p + X + p Central ProductionX= particles, glueballs Discovery Physics

• p + p p + p elastic

•Investigating QCD processes with color singlet exchange: C=+1, C=-1 Gluonic degrees of freedom in hadrons – exotica (glueballs…) QCD nature of diffractive processes – structure of Pomeron, Odderon…

•DPE process in QCD

•Roman Pots at RHIC

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•STARSTAR

Technical Implementation and Status

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1. A new vacuum chamber in DX-D0 region will be needed to accommodate Roman Pots to allow maximum acceptance, namely accept protons that clear the aperture of the DX magnet.

2. Detailed proposal submitted to STAR.

3. Technically it can be mounted in 2-3 years.

4. There is a dedicated talk by Wlodek Tomorrow.

•Acceptance

•Roman pots11/20/09 RSC - LBL

•STARSTAR TPC in High Luminosity EraProspects

• TPX upgrade completed last year (<5% dead at 1kHz). S/B ~30 vs.20 for old electronics

• Increase in space charge due to Luminosity and faster readout.

• Results in more trips, and larger corrections.- Reduce HV on anode wires; extensive studies

were done in run-9; Looks good.- Corrections are still under control.- Adding monitoring will improve this

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•STARSTAR GMT – place 8 10cm x 10cm Triple GEM chambers at R~2.2M to help monitor and improve TPC distortion corrections

•MRPC ToF barrelMRPC ToF barrel•Ready for run 10Ready for run 10

•RPSD

•PMD

•FPD

•FMS

•EMC barrel•EMC End Cap

•DAQ1000DAQ1000•Ready for run 9

•HFT FGT: GEM-layers

•finished

•ongoing

•MTD

•R&D

•GMT

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•STARSTARGMT – Plans

• R&D in progress.• Builds on FGT construction with Gem foil technology,

and readout system. • Goal is two have two chambers for RHIC run 11 and all

chambers for run 12.• GMT will enable continuous monitoring of TPC

distortions.

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•STARSTARSummary

• STAR upgrades addresses a wide range of physics measurementsFGT addresses W spin physicsHFT Heavy Quark physics in AA and pp (200 GeV)

• Proposed upgradesMTD will enhance J/Psi, Y physics in AA and ppFHC can address forward jet physics in pp, dA.The HLT can significantly increase STAR capabilities in analysis by

enhancing data samples.Roman Pots phase-2 addresses fundamental hadron physics in pp

• In addition to these STAR continues to upgrade the trigger system. • It is a challenge to prioritize and have these available for physics

measurements• New upgrade proposals are being internally reviewed in STAR.• There is a STAR upgrade Meeting at BNL on December 17-18 to

prioritize upgrades in context of STAR future program.

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