STAR Upgrades

1
STAR Upgrades
14-Oct-2005, LBNL STAR Heavy Flavor Tracker
Workshop R. Majka
2
STAR Upgrades
FMS Forward Meson Spectrometer Mono-jet
signature of CGC. Gives STAR almost continuous
EMC coverage 0 DAQ rate upgrade, TPC readout replacement (fully
pipelined system with 10x current data rate)
large untriggered data samples, triggered samples
gain 2x in live time. TOF Full Barrel Time of
Flight doubles PID reach, with TPC allows
statistical PID to high pT HFT/IST micro
vertexing capability -1 Barrel Silicon Heavy Flavor, ee- (with ToF and
TPC). FST/FGT forward (1charge sign discrimination for Ws sea (anti)
quark contribution to nucleon spin.
3
STAR Upgrades
DAQ and TPC-FEE upgrade
Full Barrel Time-of-Flight system
Forward Meson Spectrometer
Magnet
Barrel EMC End Cap EMC
Beam-Beam Counters
Forward po Det.
TPC
ZDC
VPDs (TOF Start)
Photon Mult. Det.
Forward triple-GEM EEMC tracker
FTPCs
Integrated Tracking Upgrade
Forward silicon tracker
HFT pixel detector
Barrel silicon tracker
4
Forward Meson Spectrometer
Measurement of the parton model gluon density
distributions, xg(x), in gold nuclei for
0.001saturation effects Measurements to resolve
longstanding questions about the origin of very
large transverse spin asymmetries in p? p ? po
X reactions for forward po production (Collins,
Sivers).
5
FMS implementation Electromagnetic calorimeter
with full azimuthal coverage, 2.5enough to have reasonable efficiency for heavier
mesons ? gs (K, D, )
Located at tunnel exit on west side Inner 684
blocks, 3.82 x 45 cm Outer 756 blocks, 5.82 x 60
cm Use existing Pb Glass, PMT, bases Need R/O.
Designed to have trigger capability
6
FMS Schedule

• Started construction in summer 2005, finish
  installation by fall 2006 ready for FY2007 run.
• RHIC cryo startup in Dec. will allow platform and
  some Pb glass to be installed this year.

7
DAQ TPC RO Upgrade

• Acquisition of very large data samples for
  precision and rare process studies e.g.,
  symmetry restoration/breaking,
• ?? HBT,
• Triggered data sets benefit - dead time reduced
  to 0
• Space for end cap tracker for W physics

Goal Increase Data rate for most detectors to
1kHz
Make use of CERN developments for ALICE/LHC TPC
PASA (preamp/shaper amp) ALTRO (digitizer,
digital filter, zero suppression, buffer) SIU
(Optical data sender) D-RORC (PCI optical
receiver board)
8
(No Transcript)
9
Agreement to purchase chips under negotiation
with CERN
Schedule Nov. 2005 Small prototype in
STAR Nov. 2006 Two Sectors in STAR Nov. 2007
Full TPC readout in STAR
10
Time of Flight
MRPC technology 3800 modules, 23,000 readout
chan. to cover TPC barrel Large coverage p-1particles in acceptance IDd Fast detector with
high granularity
Joint US/China project China MRPC modules US
- Electronics, trays, integration
This technology has been demonstrated with
prototype tray in STAR for three years yielding
nice physics results Spectra, charm yields,
11
New scientific reach with the proposed STAR TOF
detector

• Identified hadron spectra
• freeze-out dynamics
• hadronization mechanism
• Identified particle correlations
• Chemical and kinetic properties of in-medium jet
  associated spectra
• Fluctuations and correlations of strange
  particles and baryons
• Lepton program
• In-medium Vector Meson Properties
• Heavy Flavor
• Importance of HFT!

12
Identified spectra

• TOF covers 0.5
• dE/dx at relativistic rise extends PID beyond pT
  of 10 GeV/c
• dE/dx calibration matters!!!

13
TOF Recent Progress

• Proposal at DOE
• Successful DOE baseline review Aug. 22-23 at BNL
• Funding can start in FY06 pending closeout of
  review and congress passing a budget (2.4M is
  being held at BNL)
• Module construction ready to start in China
• Schedule 3 years for construction partial and
  increasing coverage during
  construction period
• Prototype tray (TOFr5) with HPTDC readout
  installed for past run.
• Prototype with final design in upcoming run.

14
Tracking Upgrade Three Parts Pixel, Barrel,
Forward

• Pixel (HFT)
• New small radius, thin beam pipe, two layers of
  very thin pixel sensors
• Barrel (IST)
• Ultimate pointing device for HFT compatible
  with DAQ1000
• Replaces SVT remove SVT infrastructure in 1region for W(-)?e(e-) (sea anti-quark
  contribution to proton spin), and provides part
  of the 1
• Forward (FST/FGT)
• High precision Tracking in 1charge sign in W(-)?e(e-) - 10s of GeV e

15
Heavy Flavor Tracker

• Heavy flavor collectivity
• Charm quark kinetic equilibration
• Heavy flavor (c,b) energy loss
• Vector mesons ? ee-

• Two layers of CMOS pixel detector around a new
  thin small radius beam pipe
• 108 pixels, (30 mm)2
• 50 mm thick
• 10 mm point resolution

• Significant progress on
• Physics case, physics design and vetting with
  simulations
• Mechanical design
• integration and installation
• support
• alignment
• calibration

16
Barrel
Three double layers of single sided silicon strip
detectors
Forward 4 Silicon strip discs plus GEM layer on
End Cap
HFT
Common readout (AVP-25) used for silicon and GEM
17

• Tracking Upgrade
• Proposal for HFT was reviewed internally in STAR
  first observations and a recommendation from S.
  Steadman on how to proceed were presented at the
  STAR collaboration meeting in Warsaw.
• Optimization and final vetting still to be done
  especially for IST and forward tracking
• Optimization of packaging of project(s) still
  to be worked out
• RD on pixel sensors could lead to a prototype
  detector in STAR with some physics capability in
  FY08-Fy09

18
Time Line
Preliminary
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22

• PHENIX proposal Barrel Silicon
• 2cm radius x 500um thick beam pipe
• 2.5 cm radius pixel layer (50 x 425 um pixels,
  200um thick sensors 150um r/o chip - 1.2 Xo)
• 3 layers of 2-D single sided silicon strips
  effective cell size 80 x 1000um. (6, 8, 10 cm
  radius, 1.8 Xo ea.)

23
For 2200 ub-1 delivered AuAu Luminosity PHENIX
estimates 156k c?e (pT 1 GeV/c) and 1600 D?Kp
(pT2 GeV/c)
24
Questions/observations/suggestions for Proposal

• The time is now. QM2005 generated a lot of
  excitement over NPe results which greatly
  strengthens the physics case for a direct
  measurement.
• We need to set real milestones for getting out
  proposal(s) and stick to the deadlines.
• Get help if needed

25
Questions/observations/suggestions for Proposal
2. ToF, DAQ1000 will be there, so assume them in
all simulations and rate estimates 3. Number of
events for a 3s signal is a useful FOM for
design, but the proposal should have the relevant
spectra with the errors that can be achieved with
the upgrade. 4. The full suite of measurements
needed to extract the physics should be discussed
quantitatively in the proposal (pp reference,
d-Au, other species, energies, ). This will
help make the case that the greatly improved
sensitivity provided by the upgrades is
necessary. 5. What is the improvement in
momentum resolution (mass resolution) for
??ee-
26
Questions/observations/suggestions for Proposal

• Recent discussion regarding the fate of the SVT
  has sensitized a lot of people to the amount of
  material both detector and infrastructure.
  Need to demonstrate that g conversions can be
  dealt with and that momentum resolution is not
  harmed (??ee-).
• Can we measure Lc?

27
Request from Tom Ludlam for input to RHIC
mid-term Plan (by Oct. 19)

• For those mid-term projects that don't yet have a
  proposal (PHENIX End Cap VTX and NCC STAR HFT
  and Integrated Tracking Upgrade) can you provide
  a SHORT synopsis of physics requirements,
  technical specs, RD prerequisites, and estimated
  cost (better yet, a profile of annual costs).
• List RD requirements between now and 2012 in
  order to implement the proposed upgrades.
• Estimate the additional operating costs as these
  upgrades come on-line.
• Our report should have a statement about the
  readiness of PHENIX and STAR to operate at RHIC
  II luminosity, once these upgrades are in place.

http//www.rhic.bnl.gov/midterm/