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CBM@FAIR : A status report

CBM@FAIR : A status report. Subhasis Chattopadhyay FAIR meet@VECC Status of FAIR Funding agency meetings CBM physics book MUCH: status Detector Electronics Simulation Plan. Physics with FAIR: Indian perspective: March 8-10, 2010,VECC.

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CBM@FAIR : A status report

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  1. CBM@FAIR : A status report SubhasisChattopadhyay FAIR meet@VECC Status of FAIR Funding agency meetings CBM physics book MUCH: status Detector Electronics Simulation Plan

  2. Physics with FAIR: Indian perspective: March 8-10, 2010,VECC 135 participants 25 institutions Sponsor: EU-fp7 fund

  3. Agenda Highlights PANDA session Overview: S. Kailas, BARC-Mumbai B. J. Roy, BARC-Mumbai Electronics in PANDA: V. B. Chandratre NUSTAR session NUSTAR Overview: R. Krucken , Chairman, NUSTAR Board R. Palit, TIFR, Mumbai D. Mehta, Punjab Univ, Chandigarh S. Mandal, Delhi Univ, New Delhi U. DattaPramanik, SINP Chandana Bhattacharya, VECC A. K. Jain, IIT-Roorkee “Summary” :R. Pillay, TIFR, Mumbai CBM session Overview: P. Senger “CBM Project” : Walter Mueller, GSI “Silicon detector for CBM” : Johann Heuser, GSI “Muon Chambers for CBM” : Anand K. Dubey “Online event selection” :I. Keisel, GSI “MUCH Electronics: Indian Effort”: Susanta Pal “ CBM Physics” : Several presentations Summary session Chair: B. Sinha Guest of Honour: Y. S. Mayya, CMD, ECILInaugural address: B. Sinha Status of FAIR: D. Majka, Research Director, FAIR Participation at FAIR: technological challenges: R. K. Bhandari " Indian industry participation at FAIR": Y. S. Mayya “Indian participation at FAIR: administrative status”P. Asthana Technology session: LEB magnets Beam stopper Presentation by ECIL Power converter FEE

  4. CBM/HADES APPA PANDA NuSTAR FAIR: Modularized Start Version APPA Zbigniew Majka, Kolkata, India

  5. Milestones (as presented by B. Sharkov in CBM collab meet on 12/4/10) 2010: March: Russian PM (Putin) has signed Russian agreement for 178M Euro contribution to FAIR 2010: October 4th: Formation of FAIR Gmbh 2011: Sept-Oct: Site preparation (Cleaning trees) 2012: June-July: Civil construction begins 2016: Civil construction ends 2016: Installation of accelerators and detectors

  6. CBM Physics Book • Content: • Bulk Properties of Strongly Interacting Matter • In-Medium Excitations • Collision Dynamics • Observables and Predictions • The CBM Experiment • Appendix: Overview on heavy-ion experiments • 1000 pages, about 60 authors, • Submitted Sept. 2009 to Springer as "Lecture Notes in Physics" • Electronic version will be available on document servers once • an official version is approved by Springer.

  7. Charmonia at FAIR (high density , not high temperature): • Less regeneration, less absorption, as lifetime of the partonic • Medium is smaller and collision time larger, compared to RHIC • <pt^2> should increase with pT, at RHIC generation makes it constant • Formation time of the medium is larger at FAIR (1fm, 0.1 at LHC), formation • time of J/Psi will make suppression smaller. May be used to distinguish • different suppression mechanism like Co-mover. • Chiral sym restoration at higher energy is cross-over, at low energy it is first-order. • Charmed baryon is more important at lower energy

  8. Color superconductivity at CBM: Best possibility: 2-flavoured SC phase. Critical temp = 20-100 MeV Fluctuation is one of the best observables (creation of sigma and pi filed) A prominet Pre-critical region exists Dilepton production Is a signature

  9. Summary of highlighted observables at CBM Systematic approach for chiral-symmetry restoration study (dilepton probe) EM probes via dilepton: Will probe susceptibilites and electrical conductivity of the medium, dilepton emission will enhance due to longer mixed phase. Open charm: RHIC shows elliptic flow and the suppression of charm spectra. Which type of interaction (by quark or gluon) are dominant. CBM with dilepton probe can distinguish them. Deconfinement: Most promising connection to the observable is ,

  10. CBM@SIS100 Beam energy: 2 to 14 GeV Energy density 2.5 GeV/fm^3, Baryon density: 2-7 times nuclear matter density. Maximum density at the core (like collapse of supernovae and neutron stars)

  11. What happens around √sNN = 5 -10 GeV? net baryon density: B  4 ( mT/2)3/2 x [exp((B-m)/T) - exp((-B-m)/T)] baryons - antibaryons

  12. Transport model predictions UrQMD: L.V. Bravina et al., Phys. Rev. C60 (1999) 044905 E. Bratkovskaya, W. Cassing FAIR beam energies: A+A collisions up to 45 (35) AGeV, Z/A=0.5 (0.4) (p+p and p+A collisions up to 90 GeV)

  13. Particle multiplicity x branching ratio for min. bias Au+Au collisions at 25 GeV (from HSD and thermal model) SPS Pb+Pb 30 A GeV

  14. CBM physics topics andobservables The equation-of-state at high B  collective flow of hadrons  particle production at threshold energies (multistrange hyperons, open charm?) Deconfinement phase transition at high B excitation function and flow of strangeness (K, , , , ) excitation function and flow of charm (J/ψ, ψ', D0, D, c) (e.g. melting of J/ψ and ψ') excitation function of low-mass lepton pairs  disappearance of quark-number scaling of elliptic flow QCD critical endpoint  excitation function of event-by-event fluctuations (K/π,...) Onset of chiral symmetry restoration at high B in-medium modifications of hadrons(,, e+e-(μ+μ-), D)

  15. Digging out the experiental signal Substraction of combinatorial background and known sources of μ+μ- pairs in the region of low invariant masses (NA60):

  16. Development of fast, highly granular muon detector for Compressed Baryonic Matter experiment @FAIR MuCh detector 2007 20 20 20 30 35 cm • Beam : 2015 • Distance – 2.6 m • Chambers: high • resolution gas detectors • (entire Indian effort) • Challenges: • High Rate • High density • Large background 260cm Fe Fe Fe Fe Fe 5 cm 0 cm 102.5 cm

  17. BEAM AREA @ sept’08

  18. Beam test Aug-Sept ‘09 GEM2 GEM1 Test beam setup’09

  19. Aug-Sep09 test (with 2.3 GeV/c protons) pulse height spectra Correlation between GEM1 and GEM2

  20. ADC distribution of main cell and variation with HV 4 fold increase in ADC for a deltaV(GEM) increase by 50V

  21. Determining the Efficiency Time difference between trigger(aux) and GEM ROC Procedure: Get the GEM pads hit in 900-1200 nsec after last Aux. Offset + drift time Using STS Hits

  22. Efficiency with time Eff_66 HV= 3650 HV= 3750 Looks like the detector takes some time to become stable, -- need more online investigations 95 % efficiency has been achieved by 3 GEM chamber used by the CMS upgrade group. The chamber tested in June2010.  next slide

  23. 10 cm x 10 cm GEMs Readout: Strips of 0.8 mm pitch so 95 % efficiency is achievable things can be complicated with pads, -- one such large GEM with pad readout was tested in June 2010 -- analysis is still underway Preliminary Slides from Stefano Colaresi – CMS upgrade, RD51 miniweek, 19-07-2010

  24. Beam time : June 2010 (cancelled due to GSI accelerator problem) • Build two chambers, 3mm x 3mm and 4mm x 4mm • Adjustable drift/induction gap • Significant changes in PCB layout (RamNarayan) • Cosmic Ray tests: • Efficiency ~78%, (conventional electronics) ,tried several times (no improvement) • CMS has tested with same gas mixture: >95% efficiency • Coupling to nXYTER; • Have we concluded timing characteristics of nXYTERwrt GEM? • Next Beam time: Dec 13-17, 2010 • Design of full detector underway • Any discussion is welcome

  25. Electronics • Getting more complicated • Had several phone meetings with Walter, • the scheme of electronics layout is changing • NO ROC • It is slowly appearing to be full development • and production of MUCH electronics and needs more • collaboration with other CBM groups • Sushanta, TKB, Madhu, Rama and the team must gear up • (new institution/industry??) • Walter (mail yesterday): It is time to start something real ABB ROC FEEB DCB DET BNeT FLES ABB

  26. ROC board built in India and tested at GSI

  27. NEW Proposal: 2.5 Gbps Radiation Tolerant Serializer Design for the CBM–DAQ in 180 nm CMOS process PradeepBanerjee, Dr. T. K. Bhattacharyya, E & ECE Dept., Indian Institute of Technology, Kharagpur

  28. Xyter #1 A peep into some feasible ‘Hub’ ASIC Requirements • Capacity for data aggregation from several Readout-ASICs into a single output link • 1 ‘hub’ ASIC may contain 6 high speed Serializers : 6 Tx for data  15 Gbps serviceable data bandwidth • 1 Rx – 1 Tx channel for clock, sync, control • 250 MHz sys clock as Transmit clk  500 Mbps (DDR LVDS) input interface • 5-8 LVDS o/p links (each 500 Mbps) per chip  • FEBa8 case : 1 LVDS link per chip: combinedata of 6 FEBs (48 LVDS links) per Hub • FEBa1 case : All 6 LVDS links (single chip) per Serializer • Cross-Connect Topology: Dynamic load balancing b/w the 6 output links desirable FEB sys_clk HUB Asic Serializer #1 Six 2.5 Gbps o/p links 5-8 LVDS links (500 Mbps) per chip Serializer #2 Xyter #2 Detector i/f #6 #8 PLL Clk Gen clock, sync, control i/f 15th CBM Collaboration Meeting ‘Hub’ Idea: Walter F.J. Müller, GSI 7

  29. Simulation Do we have optimized design?

  30. Funding • In last FAIR task Force meet and DAE-DST co-ordination comm meet, Seed money funding extended fror one year. No minute yet, so no formal letter from DST • DPR to be prepared (for full project) • Will discuss in detail in PI’s meet

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