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

135 participants25 institutions

Sponsor: EU-fp7 fund

PANDA sessionOverview: S. Kailas, BARC-MumbaiB. J. Roy, BARC-MumbaiElectronics in PANDA: V. B. Chandratre

NUSTAR sessionNUSTAR Overview: R. Krucken, Chairman, NUSTAR BoardR. Palit, TIFR, MumbaiD. Mehta, Punjab Univ, ChandigarhS. Mandal, Delhi Univ, New Delhi U. DattaPramanik, SINPChandana Bhattacharya, VECCA. K. Jain, IIT-Roorkee“Summary” :R. Pillay, TIFR, Mumbai

CBM sessionOverview: 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 sessionChair: 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 stopperPresentation by ECIL Power converter FEE

Agenda Highlights

PANDA

FAIR: Modularized Start Version

CBM/HADES

NuSTAR

APPA APPA

Zbigniew Majka, Kolkata, India

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 begins2016: Civil construction ends 2016: Installation of accelerators and detectors

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.

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

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

Dilepton productionIs a signature

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 ,

CBM@SIS100

Beam energy: 2 to 14 GeVEnergy 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)

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

Transport model predictionsUrQMD: 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)

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

CBM physics topics and observables

Onset of chiral symmetry restoration at high B

in-medium modifications of hadrons (,, e+e-

(μ+μ-), D)

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

The equation-of-state at high B

collective flow of hadrons particle production at threshold energies (multistrange hyperons, open charm?)

QCD critical endpoint excitation function of event-by-event fluctuations (K/π,...)

Substraction of combinatorial background and known sources of μ+μ- pairs in the region of low invariant masses (NA60):

Digging out the experiental signal

MuCh detector 2007

Fe Fe Fe Fe Fe

20 20 2

0 30

35 cm

102.5 cm0 cm5 cm

260cm

1. Beam : 20152. Distance – 2.6 m3. Chambers: high resolution gas

detectors (entire Indian effort)

Challenges: High Rate High density Large background

Development of fast, highly granular muon detector for Development of fast, highly granular muon detector for Compressed Baryonic Compressed Baryonic Matter experiment @FAIRMatter experiment @FAIR

BEAM AREA @ sept’08

GEM2 GEM1

Test beam setup’09

Beam test Aug-Sept ‘09

Aug-Sep09 test (with 2.3 GeV/c protons)

Correlation between GEM1 and GEM2

pulse height spectra

ADC distribution of main cell and variation with HV

4 fold increase in ADC for a deltaV(GEM) increase by 50V

Time difference between trigger(aux) and GEM ROC

Procedure: Get the GEM pads hit in 900-1200 nsec after last Aux.

Offset + drift time

Determining the Efficiency

Using STS Hits

Eff_66

Efficiency with time

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

25

Slides from Stefano Colaresi – CMS upgrade, RD51 miniweek, 19-07-2010

10 cm x 10 cm GEMsReadout: 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

Beam time : June 2010 (cancelled due to GSI accelerator problem)

(a)Build two chambers, 3mm x 3mm and 4mm x 4mm(b)Adjustable drift/induction gap(c)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 nXYTER wrt GEM? Next Beam time: Dec 13-17, 2010

Design of full detector underway

Any discussion is welcome

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

DET FEEB ROC DCBABB

ABB

BNeT

FLE

S

ROC board built in India and tested at GSI

NEW ProposalNEW Proposal:: 2.5 Gbps Radiation Tolerant 2.5 Gbps Radiation Tolerant Serializer Design for the CBM–DAQ in 180 nm Serializer Design for the CBM–DAQ in 180 nm

CMOS processCMOS process

Pradeep Banerjee,Pradeep Banerjee,

Dr. T. K. Bhattacharyya, E & ECE Dept.,Dr. T. K. Bhattacharyya, E & ECE Dept.,

Indian Institute of Technology, KharagpurIndian Institute of Technology, Kharagpur

12th – 16th April, 2010 15th CBM Collaboration Meeting

A peep into some feasible ‘Hub’ ASIC RequirementsA 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: combine data 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

Xyter #1 Serializer #1

#6

Serializer #2 5-8 LVDS links

(500 Mbps) per chip

Xyter #2

#8

FEB HUB Asic

Detector i/f

Six 2.5 Gbps o/p links

clock, sync, control i/f

7‘‘Hub’ Idea: Hub’ Idea: Walter F.J. Müller, GSI

PLL Clk Gen

sys_clk

Simulation

Do we have optimized design?

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