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Upgrade plans and new projects. ALICE upgrades Compressed Baryonic Matter (CBM) experiment at FAIR/GSI Generic R&D projects. ALICE upgrade plans. Timeslots for potential upgrades 2012: 1 year shutdown (minor upgrades) 2018 (?): 1 year shutdown (major upgrades, e.g. beam line modifications) - PowerPoint PPT Presentation
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Upgrade plans and new projects
• ALICE upgrades
• Compressed Baryonic Matter (CBM) experiment at FAIR/GSI
• Generic R&D projects
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ALICE upgrade plans
• Timeslots for potential upgrades
– 2012: 1 year shutdown (minor upgrades)
– 2018 (?): 1 year shutdown (major upgrades, e.g. beam line modifications)
• Ongoing projects
– 4th PHOS module
– modification of PHOS trigger
– upgrade of TPC and PHOS readout (new RCU)
– High Level Trigger “dynamic” upgrade
• Potential new projects
– Several major upgrade projects, e.g. a new pixel layer (close to beam, higher resolution) under discussion
– Proposed project with major Norwegian participation:Forward and very forward calorimeters
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ALICE upgrade: forward physics at LHC
• Measurements at small angle/large pseudorapidity» low-x parton distributions
• Main physics topic
– p(d)+A» gluon saturation» study of ”cold” nuclear matter » probing the initial condition
– A+A» elliptic flow
» jet quenching
» long-range rapidity correlations
» baryon transfer
» …
410-6 10-4 10-2 100
x
108
106
104
102
100
M2 (
GeV
2)
Kinematics
RHIC example• At 4° (y~3 for pions) and pT=1 GeV/c
one can reach values as low of x2 ~ 10-4
• This is a lower limit, not a typical value: most of the data collected at 4° would have x2~0.01
Guzev, Strikman, and Vogelsang (hep-ph/0407201)
y=rapidity of (xL, k) system
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2
21 process
22 process
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Gluon PDF in small-x region
• high gluon density -> saturation, CGC• nuclear dependence of saturation scale
F. Arleo 2008
Large ambiguity at small x for proton
Eskola – EPS09(arXiv:0902.4154)
Even larger ambiguity at small (x, Q2) for Pb
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RHIC vs. LHC
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Upgrade idea
• Forward spectrometer– Conceptual design
» EM-Calorimeter for gamma, pi0, eta, J/Psi at y=5
» O(10) meters away from IP
» large dynamic range
» high occupancy (A+A)
» two separation (0 -> 2 kinematics)
» Hadron calorimeter?
cm 2cm 20m) 50(L
00038.00038.0
74274(GeV/c)
101(GeV/c)
min2
tot
T
p
p
highly segmented (also longitudinally) tracking calorimeter
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Upgrade idea
• Possible implementation– hybrid design: Si/Scint/W
Particle
15? layers (W + Si pad)6 layers(W + Si pad)
single layer
(W only)n layers lead–scintillator
X-Y Si strips X-Y Si strips
Si pixel
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Challenge
• Where to put the calorimeter
– Large distance from IP (50m)
» ”Standard” calorimeter design
» Conflict with LHC magnets, new beamline
– Close to the IP (5-20m)
» Very high segmentation
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Timeline
• 2013
– Phase 1
– inside magnet
– < 4.5
• 2018
– Phase 2
– outside magnet
– beamline modifications
– > 4.5
• Proto-collaboration– CNS Tokyo, Yonsei, Kolkata, Mumbai, Jammu, Utrecht/Amsterdam,
Jyväskylä, Prague
– Copenhagen, Bergen, LBL, Oak Ridge, Nantes, Jaipur, …
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New projects
• Compressed Baryonic Matter (CBM) experiment at FAIR/GSI
– FAIR construction will start in 2012 (?)
– CBM detector installation: not before 2017
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CBM experiment at FAIR/GSI
• Facility for Antiproton and heavy Ions Research
• Funded, construction will start soon
• CBM experiment – fixed target experiment, beam energy up to 30 GeV/nucl.
– super-dense baryonic matter
– in-medium properties of hadrons
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CBM
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CBM
• Physics interest– QCD critical point - fluctuations
– Chiral symmetry restoration – in-medium modifications of hadrons
• Possible instrumentation activities– Monolithic Active Pixel Sensor readout (3D stacking)
– Projectile Spectator Detector (forward calorimeter)
– Online event reconstruction – high level trigger
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Generic R&D projects
• Monolithic Active Pixel Sensor readout (3D stacking)– Microelectronics: Kjetil Ullaland, Shiming Yan, Olav Torheim
– in collaboration with Strasbourg
• Highly segmented calorimeters– Detectorlab:
Characterization of SiliconPhotoMultipliers, MAPDs, MPPCs ...
– Participation in NA61
– Collaboration with HUS/PET-center
• Radiation effects in microelectronics– SEU in SRAMS: neutron dosimetry
– Microelectronics: Kjetil Ullaland
– Collaboration with HUS and CERN (EN/STI)
Njål Brekke
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Highly segmented calorimeters
• Example of ongoing activities: X-Y table
Setup for testing single pixels response
3 microstepper motors with μm precision
Microscope with camera for pattern recognition
Currently testing MPPC pixels by sending light pulses through microscope
Andreas Samnoy
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3D (vertical) integration
• Next generation pixel detectors– ALICE/ATLAS central pixel detector
– Very forward calorimeter
– CBM MicroVertexDetector
• Sensor Monolithic Active Pixel Sensor
• 3D integration– high spatial resolution, lower capacitance
(and hence, lower noise), and enough logic per pixel cell to implement fast, intelligent readout
– by thinning the wafers lower material budget is obtained
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• CBM requirements• Spatial resolution of pixels at first MVD station must be better than 5 µm (to reconstruct secondary vertex with 50 µm resolution)• Time resolution must be 10 µs or less
• MAPS to 3D approach for CBM• Data sparsification circuitry is moved from periphery of pixel matrix to top of pixel matrix Improves material budget• Column-wise discriminators in periphery replaced with discriminator in each pixel Faster readout and lower power consumption• Line-wise sequential sparsification replaced with line-wise parallel sparsification Faster readout and higher hotspot coverage
•Conclusion• MAPS to 3D approach for CBM pixel detectors is necessary to meet the requirements of time resolution (<10 µs) and hit density coverage (3.5*10^6 hits/mm^2/sec)
3D MAPS for CBM