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

» …

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

1

2

21 process

22 process

5

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

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 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

8

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

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

– < 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, …

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

14

CBM

15

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

16

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

17

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

18

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

19

• 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