Upgrade plans and new projects

1. Upgrade plans and new projects ALICE upgrades Compressed Baryonic Matter (CBM) experiment at FAIR/GSI Generic R&D projects

2. 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

3. 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 • …

4. 108 106 104 102 100 M2 (GeV2) 10-6 10-4 10-2 100 x Kinematics 1 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 21 process y=rapidity of (xL, k) system 2 22 process Guzev, Strikman, and Vogelsang (hep-ph/0407201)

5. Gluon PDF in small-xregion • high gluon density -> saturation, CGC • nuclear dependence of saturationscale Large ambiguity at small x for proton Even larger ambiguity at small (x, Q2) for Pb Eskola – EPS09(arXiv:0902.4154) F. Arleo 2008

6. RHIC vs. LHC

7. 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 g separation (p0 -> 2g kinematics) • Hadron calorimeter? highly segmented (also longitudinally) tracking calorimeter

8. Upgrade idea Possible implementation hybrid design: Si/Scint/W Particle single layer (W only) 6 layers (W + Si pad) 15? layers (W + Si pad) Si pixel n layers lead–scintillator X-Y Si strips X-Y Si strips

9. 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

10. Timeline • 2013 • Phase 1 • inside magnet • h < 4.5 • 2018 • Phase 2 • outside magnet • beamline modifications • h > 4.5 • Proto-collaboration • CNS Tokyo, Yonsei, Kolkata, Mumbai, Jammu, Utrecht/Amsterdam, Jyväskylä, Prague • Copenhagen, Bergen, LBL, Oak Ridge, Nantes, Jaipur, …

11. New projects Compressed Baryonic Matter (CBM) experiment at FAIR/GSI FAIR construction will start in 2012 (?) CBM detector installation: not before 2017

12. 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

13. CBM

14. 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

15. 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

16. 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

17. 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

18. 3D MAPS for CBM • 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)