1

36th ALICE RRB

P. Giubellino April 30, 2014

pPb @ 5 TeV

2

A very busy period! • An extremely intense LS1 detector activity

– Consolidation – Installation of new detectors – Major improvements to the readout and trigger – Lot of new infrastructure (incl. new Control Room)

• ON SCHEDULE! • The Upgrade progresses

– ITS TDR gone through the full procedure, including UCG and RB – Trigger and Readout Electronics TDR to go to UCG – TPC TDR submitted, MFT and O2 in preparation

• Analysis of RUN1 data in full swing – 82 papers – Impact of the publications remains extremely high (3 highest number of

citations for LHC Physics papers after the 4 Higgs discovery ones ) – Strong presence in 2013 at Strange Quark Matter (32 talks) and Hard Probes

(18) – 31 talks and 90 posters for the 2014 Quark Matter Conference (May 22-28

in Darmstadt), so a total of 121 contributions: the harvest of physics results continues solidly

3

0

20

40

60

80

100

120

140

160

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

Number of participating institutes in ALICE (1999-2014)

Total Full Members Associate Members

ALICE Continues to grow!

Discussions continue with institutions from Austria, Chile, China, Thailand and Pakistan

A scientific and technological program with great prospects!

Latest: Bonn University (Germany) and University of Witwatersrand (South Africa)

4

Organization

• Elections: – Collaboration Board Chair deputies elected for 3 years

(J. Harris and H. Hamagaki)

– Editorial Board co-chairs elected for 3 years

(C. Loizides and E. Scomparin)

– Conference Committee chair renewed for 3 yrs (E. Vercellin)

– Resource Coordinator elected for 3 yrs (A. Telesca)

• Nominations:

– Electronics Coordinator (A. Kluge)

– New Member of the Conference Committee : (S. Raniwala)

– New members of the Editorial Board: (A. Dainese)

5

More on Organization

• Projects leaders: – Project Leader for the SSD detector: P. Kuijer

• Physics Working Group Coordinators nominated: – Ralf Averbeck (PWG-HF) – Cvetan Cheshkov (PWG-pp) – R Preghenella (PWG-LF) – M Weber (PWG-CF) – K Reygers (PWG-GA) – R Shahoyan (PWG-PP)

• Ongoing a census of all activities in the Collaboration • New publication rules approved by the CB

– A long process, elaborated by an ad-hoc committee, but seeking input from all people involved

• Collaboration Board, Editorial Board, Physics Board, Conference Committee, Juniors

LS1 progress

LS1 progress:

• On track with LS1 schedule

• Lots of activities ongoing at P2. Deep involvement of several CERN groups (EN-EL, EN-CV, GS, PH-DT, …) THANK YOU!!

• Still a lot of work ahead…

Main activities planned for LS1: • Complete TRD detector (+5 Supermodules) • Install DCal calorimeter (8 Supermodules). Including

support structure and support beams • Install 1 PHOS Supermodule • Numerous detector consolidation efforts • EN-EL: UPS replacement and electrical infrastructure

consolidation • EN-CV: P2 chilled water upgrade (+60% power) • EN-CV: L3 ventilation upgrade (+60% flow)

+ replacement of the whole DAQ/HLT, new readout for the TPC

(factor of 2 faster), new gas for the TPC, new RO for calorimeters, new

PMs for V0 , upgrade of the Trigger …

The 2013 plan…

• accomplished

LS1 plan 2013 Weeks

Remove plug, mobile shielding, open doors 8-9

Prepare for PHOS extraction, remove RB24 beampipe and PMD 10

Remove PHOS cradle and modules, transfer TOF crates on SF 11-13

Modify L3 services and install YP for TRD17 14

Modify L3 services, remove TRD17 and rework LV distr. TRD 7-8-10, DCal tests in SXL2 15-19

Modify L3 services, open low-beta and swap Q5L8 magnet, DCal tests in SXL2, new UPSes 20-23

Swap PHOS beams with DCal beams 25-26

Install DCal support structure and rails 27-30

DCal and PHOS services + complete support structure and rails 31-37

Open Days – 28-29/9 38-41

Install C-side DCal supermodules 42-45

Rework LV distr. TRD11-15-16 46-48

TOF electronics weight transfer to Spaceframe 49-51

Xmas pause 52-1

And the 2014 one LS1 plan 2014 Weeks

Installation PX24 scaffolding 2-3

Remove compensator magnet 4

New L3 ventilation ducts 4-7

Remove PX24 scaffolding, install top TRD counterweights 9

400V and 18kV test – NO ACCESS P2 10

Prepare for Miniframe suspension, reinstall ACO modules 11-16

Extend SAA3 shielding 17-20

Suspend Miniframe and install TRD12-13-14 (bottom), remove bottom counterweights, reinstall ZDCs (w24-26)

21-25

‘Un-suspend’ Miniframe 26-27

Bring concrete blocks inside SX2, re-arrange hall Revol 28-35

Reinstall and survey compensator magnet 36

Reinstall and bakeout RB24 beampipe 37-38

Reinstall TRD17 Between 36-39

Reinstall PMD, ZEM, BCM and BLM (including new one) 39

Install 4 PHOS + 1CPV + 3 DCal (A-side) supermodules 40-45

Concrete walls & TRD installation frame 46

Install TRD4-5 (top) & remove top counterweights 47

Remove TRD infrastructure and close L3 doors 48

Reinstall Miniframe shielding and close plug 49-51

Done

Ongoing

Done Done Done Done

Ongoing

Setup: • 8 DCal SMs • 4 PHOS SMs

• Complete reshuffling of the bottom part of L3! Total weight: 80 tons

• Support structure and 5 DCal SMs already installed, rest ready for installation

• The remaining PHOS and DCal SMs will be installed in September 2014

New support structure

already installed

DCal and PHOS

DCal

PHOS

• 8 DCal SMs • 4 PHOS SMs

Both 1/3 modues (C and A side) installed

C-side DCAL modules installed

Elements that go inside

the PHOS module are well under control (FE Cards, TRUs)

SRU production • 16 SRU ordered to TESLA • 8 SRU produced, 2 with

problems of delaminated PCB.

• Production stopped until new PCB are produced.

PHOS Consolidation Status

PHOS consolidation in time

Repair of Muon TRK Rework of TRD LV cables 6 TRD SMs extracted, repaired and re-installed

Improvement of the vertical displacement system of the ZDC, Detectors brought to the surface

Detector consolidation (Few examples)

LS1 consolidation work (electricity, cooling)

UPS upgrade:

• UPS power increased (X5) from 160kVA to 800kVA

• Replacement of old units (from LEP times)

• Consolidation of electrical network

Rework of LV cables (TRD-TPC-TOF):

• Repair 400 LV (300mm2) cables whose insulation got badly damaged

• Installation new supports, re-routing of cables and test

Chilled water upgrade:

• Increase of 60% cooling power • Installation of 5 chillers

new pumps and heat exchangers

L3 ventilation upgrade:

• Increase air flow inside the L3 magnet by 60%

• Replacement of the PX24 and SUX2 ducts (80m)

Replacement cooling tanks:

Replacement of TRD and TPC cooling tanks with bigger ones

DAQ Computing Room 1

• Complete reshape of the DAQ computing room

– Replacement of the old racks from L3 has been done

– Optical fibers used for transferring physics data from detectors reinstalled in the racks

– Hardware replacement

– Tendering and ordering process started (LDCs, GDCs, servers)

• Evolution of the software

– All the DATE and ECS software successfully ported and tested on SLC6

– Release available on the DAQ web site for detector pre-commissioning

Run 1 Work during LS1 Run 2

The new ARC preparation taking shape!

• Tables installation ongoing

• EL and IT infrastructure finalized in 2 weeks

• PC installation in May

15

Offline Computing

• Stable Grid performance

– Reaching on the average 40000 concurrently running jobs, peeking over 53000 during last month

• Analysis activities are reaching all time high levels in preparation for Quark Matter conference

• Available resources are used efficiently

• T2 resources only partially installed (70% of disk, 80% of CPU)

• 2013 requirements largely covered by pledges but only 80% of disk requirements covered in T1

• Since December last year ALICE has a a new T1 (KISTI)

• Tier2 at USP (Brazil) now at full pledges

16

Physics (very short!)

• A huge scientific output

– 82 ALICE papers on arXiv (~ the whole RHIC program in the same time span)

– High impact papers: the top cited paper at the LHC after the Higgs discovery ones is the ALICE paper on flow in HI collisions, and out of the 10 top cited physics papers at the LHC 3 are from ALICE and one from ATLAS-Heavy Ion program (source: ISI)

– Several hundred presentations at international conferences each year

17

Articles from the LHC, ordered by number of citations (ISI) … with 5 more in the next 20 … so, 25% of the most relevant scientific production of the LHC!

18

• High-pT identified particles – Addresses medium

modification of high-z part of fragmentation functions

Identified particle ratios in pp and Pb-Pb collisions: new results at high-pT

arXiv:1401.1250

PRL 111, 222301 (2013)

Pb-Pb particle ratios are consistent with those obtained in pp collisions for pT > 10 GeV/c Chemical composition of leading particles from jets in the medium similar to that of vacuum jets

arXiv:1401.1250

19

K*0 and f resonances in Pb–Pb K*0/K– ratio suppressed in central Pb–Pb w.r.t. pp and peripheral Pb–Pb,

f/K– not suppressed (lifetimes: t(K*0)=4.16 fm/c, t(f)=46.3 fm/c)

Re-scattering of K*0 decay products in hadronic phase

p/f ratio is flat for pT<3 GeV/c for central Pb–Pb low-pT p/p and f/p ratios have same shapes baryon anomaly due to particle mass at low pT

1/3)h/dN(d

0 2 4 6 8 10 12

atc

ea

to

s

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

1/3)h/d

chN(d

0 2 4 6 8 10 12

Part

icle

Ra

tio

s

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

-/K

*0K

-/Kf

pp 7 TeV

Pb-Pb 2.76 TeV

Thermal Model

)c (GeV/T

p0 1 2 3 4 5

pR

atio

s t

o

-210

-110

1

Centrality 0-10%

pp/

(rebinned)pp/

4.8´ p/f

(b)

)c (GeV/T

p0 1 2 3 4 5

f)/

p(p

+

0

2

4

6

8

10

= 2.76 TeVNN

sPb-Pb

0-10%

20-40%

60-80%

80-90%

(a)

20

J/ψ production in Pb-Pb now with full RUN1 statistics:

studied vs centrality, rapidity and transverse momentum

Different pT (and centrality) dependence of J/ψ RAA at LHC and RHIC As expected in a scenario with cc recombination, relevant at low pT

arXiv:1311.0214

With a hint of flow..

21

Search for Λn and Λn states • H-dibaryon:

– Hypothetical bound state of uuddss (ΛΛ) – First predicted by Jaffe in a bag model calculation (Jaffe, PRL 38, 617 (1977))

• Λn bound state: – Deuteron (np bound state) – Hypertriton (like the triton, but instead of the second neutron a Λ is bound) – Why shouldn't there be also a Λ-nucleus bound state?

• Production expected in the framework of the thermal model, which correctly predicts nuclei and Hypertriton

Limit for Ln 7 times below the

thermal model expectations,

For H-dibaryon a factor of 8 if

weakly bound (favored by theory),

a factor of 2 if strongly bound

22

The role of proton-nucleus collisions • In high-energy nucleus-nucleus collisions, large energy

density (e >> 1 GeV/fm3) over large volume (>> 1000 fm3)

• In high-energy proton-nucleus collisions, large energy

densities (?) in a small volume

208Pb 208Pb

high temperature

high energy density

low baryonic density

208Pb

p

HCPSS2013, CERN Andrea Dainese | Heavy Ions 22

Photon spectrum T ~ 300 MeV Transverse energy e ~ 15 GeV/fm3

Volume ~ 3 x Pb nucleus

Control experiment: calibrate the initial-modification of hard probes (jets, heavy quarks, quarkonia) single-out final-state effects (hot medium) in Pb-Pb

Explore new territory in QCD: high gluon density in the initial state; potentially, high energy density in the final state, but in a small volume

23

p-Pb at LHC as a control experiment: D • Measurements for main hard probes in minimum-

bias p-Pb indicate that the effects seen in Pb-Pb are dominated by the hot medium

Pb-Pb (central) p-Pb (minimum bias)

Nuclear effects for PDFs

in p-Pb (EPS09)

Open Charm: No significant nuclear modification in p-Pb (RpPb~1) • Consistent with modest effect expected from PDF shadowing

RpA(AA)(pT ) =1

Ncoll

dN pA(AA) / dpT

dN pp / dpT

24

p-Pb at LHC as a control experiment: Jets

• Also for jets, no evident nuclear modification in p-Pb (RpPb~1)

Pb-Pb (central) p-Pb (minimum bias)

Large high-pT suppression in Pb-Pb (x3-4) is a medium effect probes the properties of QCD interactions over extended volumes

25

Rp-Pb for ψ(2S)

p Pb The ψ(2S) suppression in the direction of the Pb nuclei is not expected by Cold Nuclear Matter effects or energy loss Could be due to a co-mover effect?

Need more statistics (run 2) to make a firm conclusion on the question if the suppression is pT dependent.

26

Intriguing findings in high-multiplicity p-Pb

Possible interpretations:

•Hydrodynamic flow in the final state: a “medium”

•Colour reconnection: a “pure QCD effect”

– could be interesting to understand QGP formation in Pb-Pb

•Multi-gluon processes from saturated initial-state (Colour Glass Condensate)

From p-Pb pilot run:

–

0-20% 60-100%

=

Structure emerging when subtracting low

mult correlations from high-mult. Origin still

unknown …

Use ALICE PID capabilities to test these possibilities

27

Intriguing findings in high-multiplicity p-Pb

• Clear indication for mass ordering also in p-Pb

• further support for flow picture?

ALICE, arXiv:1307.3237

Pb-Pb p-Pb, high-multiplicity

• Pb-Pb: mass ordering, interpreted in terms of collective flow

Quantify the azimuthal modulation in terms of second order Fourier harmonics:

Many other measurements done (e.g. baryon/meson ratios) or in progress to provide strong experimental constraints for understanding of this unexplored area of QCD

28

The nuclear modification factor in p-Pb: latest news

PRL 110, 082302 (2013)

The new ALICE preliminary results are consistent with no modications

up to pT = 50 GeV/c.

29

Using particle identification to understand the structure

Collectivity in small systems? Color glass condensate, hydrodynamics, color reconnection, or ?

PLB 728 (2014)

p-Pb Pb-Pb

30

LHC as Pb and p

collider

Ultra-peripheral (UPC) collisions: b > R1+R2 hadronic interactions strongly

suppressed

High photon flux

well described in Weizsäcker-Williams approximation (quasi-real photons)

flux proportional to Z2 high cross section for -induced

reactions

b

R2

R1

Pb-Pb and p-Pb UPC at LHC can be used to study -Pb, p and interactions at higher center-of-mass energies than ever before

31

J/ photoproduction in UPC

• LO pQCD: coherent J/ photoproduction cross section is proportional to the square of the gluon density in the target:

• Mass of J/ serves as a hard scale:

• Bjorken x ~ 10-2 – 10-5 accessible at LHC:

• J/ photoproduction in p-Pb UPC (proton target) allows one

to probe poorly known gluon distribution in the proton at low x and search for saturation effects

• J/ photoproduction in Pb-Pb UPC (lead target) provides information on gluon shadowing in nuclei at low x which is essentially unconstrained by existing data

– gluon shadowing factor

32

Coherent J/ψ production

dielectrons pT < 300 MeV/c

dimuons pT < 200 MeV/c

Eur. Phys. J. C73 (2013) 2617

x ~ 10-2 x ~ 10-3

Good agreement with models which include nuclear gluon shadowing.

Best agreement with EPS09 shadowing (shadowing factor ~0.6 at x ~ 10-3, Q2 = 2.4 GeV2)

33

Incoherent J/ψ at central rapidity

dielectrons pT > 300 MeV/c

dimuons pT > 200 MeV/c

• Coherent : scattered on whole nucleus, Incoherent: on individual nucleon

• Almost one order of magnitude difference in the predicted cross sections

• ALICE sets strong constraints

Eur. Phys. J. C73 (2013) 2617

34

e+e- in central barrel

Huge cross section: O(100) kb

STARLIGHT, PRC60 (1999) 014903:

(LO prediction, |h|<0.9): • 2.2 GeV/c2 < Minv < 2.6 GeV/c2: s=128 mb

• 3.7 GeV/c2 < Minv < 10 GeV/c2 : s=77 mb

ALICE: • Data slightly above LO prediction

• 12% and 16% precision in two mass ranges

• ALICE data sets stringent limits on the contribution from high order terms

Eur. Phys. J. C73 (2013) 2617

e-

e+

35

J/ψ photoproduction in pPb

• Access to gluon distribution in proton target at low x • Advantage of p-Pb:

• Large photon flux from Pb, The photon source is known, so W2p = 2EpMJ/ exp(-y)

• Hadronic contribution can be strongly suppressed by ensuring Pb nuclei are intact (no signal in ZDC) • Contamination from central exclusive χc production negligible

More results to come from barrel/barrel and barrel/muon

Data collected in 2013:

p-Pb: p towards muon spectrometer

Pb-p: Pb towards muon spectrometer

Three UPC trigger options in ALICE:

• Forward: both muons in the muon arm

• Central: both leptons in the barrel

• Semi-forward: one muon in the muon arm, second in the barrel

wide gamma-proton CM energy coverage up to W ~ 1 TeV!

wide x coverage: 10-2 -10-5

p-Pb Pb-p

First results

from forward

muons

36

The future

37

The ALICE plan

• So far (RUN1):

• THE FUTURE :

– RUN2 (2015, 2016, 2017) : will allow to approach the 1 nb-1 for PbPb collisions, with improved detectors and double energy

– RUN3 + RUN4 (19, 20, 21 and 24, 25, 26): 10 nb-1 with major detector improvements

• So: three phases, each jumping one order of magnitude in statistics and progressively improving the detectors

year system energy √sNN

TeV integrated luminosity

2010 Pb – Pb 2.76 ~ 10 mb-1

2011 Pb – Pb 2.76 ~ 0.1 nb-1

2013 p – Pb 5.02 ~ 30 nb-1

38

ALICE physics goals for Run 2

• complete the originally approved heavy ion program, i.e. collection of 1/nb in Pb-Pb collisions at top energy (13 TeV p equivalent (5.5 TeV)) x10 current statistics

• pp reference running – Two main goals

• reference rare trigger sample for 1/nb Pb-Pb • increase reference unbiased sample

– 48 weeks running with rare triggers : • 60/pb (1.5 equivalent int lumi of 1/nb Pb-Pb not dominant in

uncertainty)

– 24 weeks running with min bias • 10 G events better significance than Pb-Pb for D0

• another p-Pb run, given the exciting results of the first one : – p-Pb run in Run 2 requested by all experiments

• Goal: 1 G events (x10 current) – would ~ match pp significance for D0

39

ALICE Upgrade for RUN3 and RUN4 (after LS2)

• Focus on rare probes, study their coupling with QGP medium and their (medium-modified) hadronization process

• precision studies of charm and beauty mesons and baryons and quarkonia at low-pT

• low mass lepton pairs and thermal photons • gamma-jet and jet-jet with particle identification from low momentum up to 30 GeV. • heavy nuclear states

low-transverse momentum observables (complementary to the general-purpose detectors)

• not triggerable => need to examine full statistics.

• Target: o Pb-Pb recorded luminosity ≥ 10 nb-1

8 x 1010 events o pp (@5.5 Tev) recorded luminosity ≥ 6 pb-1

1.4 x 1011 events

o Gain a factor 100 over the statistics of the approved programme

• Operate ALICE at high rate while preserving its uniqueness, superb tracking and PID, and enhance its vertexing capability and tracking at low-pT

The LS2 ALICE upgrades New Inner Tracking System (ITS)

• improved pointing precision • less material -> thinnest tracker at the LHC

Time Projection Chamber (TPC) • new GEM technology for

readout chambers • continuous readout • faster readout electronics

MUON ARM • continuous

readout electronics

Muon Forward Tracker (MFT) • new Si tracker • Improved MUON pointing precision

Data Acquisition (DAQ)/ High Level Trigger (HLT)

• new architecture • on line tracking & data

compression • 50kHz Pbb event rate

TOF, TRD • Faster readout

New Trigger Detectors (FIT)

New Central Trigger Processor

41

The ALICE Upgrade

• Five Pillars (each in a Technical Design Report):

• Completely new Silicon Inner Tracking System

• New or upgraded readout for all detectors to cope

with the higher rate

• New readout chambers for the Time Projection Chamber

• New Data Acquisition System and High Level Trigger

to handle the continuous readout, new Offline

• New Silicon Tracker in front of Muon Absorber

TDR approved by LHCC, UCG and RB

TDR discussed by LHCC UCG in June

TDR submitted to LHCC, discussion in June

TDR in September

TDR in Late 2014

P

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(GeV/c)T

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m)

mP

oin

tin

g r

eso

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(

0

50

100

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200

250

300

350

400ALICE

Current ITS, Z (Pb-Pb data, 2011)

Upgraded ITS, Z

(Pb-Pb data, 2011)jCurrent ITS, r

jUpgraded ITS, r

New ITS Layout

25 G-pixel camera (~10 m2)

r coverage:

22 – 400 mm

7 layers of MAPS

h coverage: |h| ≤1.5

Space Frame

Cold Plate

Cooling Ducts

Mechanical

Connector

9 Pixel Chips

Soldering Balls

Flex Printed Circuit

Mean X/X0 = 0.282%

Total weight

1.4 grams

(GeV/c)T

p

-110 1 10

Eff

icie

ncy (

%)

0

20

40

60

80

100

ALICE

Current ITS

Upgraded ITS

= 0.8%0

= 0.3%; OB: X/X0

IB: X/X

Pointing Resolution

Tracking efficiency

Total weight 1.4 grams

x 3 X 7

43

Explorer chip, performance of pixel chip from analogue output, pixel size: 20 x 20 mm2

Detection efficiency: 99.7%

Threshold / Noise: 20

Fake hit rate < 10-8

pALPIDE: sizeable prototype of final chip (digital output) Explorer: prototype chip with analogue output

Spatial resolution ~ 5mm

pALPIDE chip, performance of pixel chip from digital output, pixel size: 22 x 22 mm2

New ITS – pixel prototype chips and experimental results

pALPIDE

Explorer-1NPLUS STI

Explorer-1NW STI

Explorer-1NPLUS AA

Explorer-1NW AA

512 rows × 64 columns, 22 × 22 μm2 pixels

90 × 90

20 × 20 μm2

60 × 60

30 × 30 μm2

Measurements at DESY test beam (4.4 Gev electron beam) – Sep 2013 pixel chip under test

ALPIDE

44

New ITS – pixel prototype chips and experimental results

MIMOSA-22-THR-A1 (IPHC/IRFU), performance from digital output pixel size (22 x 33 mm2) and in-pixel circuitry as proposed for final chip (MISTRAL)

HR20 = epi-layer from different vendor: 6kWcm, 20mm thick

(MISTRAL)

Threshold / noise2 4 6 8 10 12

Eff

icie

nc

y (

%)

90

92

94

96

98

100

Av

era

ge f

ak

e h

it r

ate

/pix

el/even

t

-1110

-1010

-910

-810

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-610

-510

-410

-310

-210

-110

1

MIMOSA 22THR-A1 HR20 20C

S1

S2

Detection efficiency and fake hit rate (DESY, e- @ 4.4 GeV/c electron beam)

MIMOSA-22THRA

Designs fully compatible (same pad layout). Decision on architecture end of 2014

45

New ITS – R&D Prototype of Inner Barrel support structure

Prototype of Outer Barrel Stave

1.5 m

Full scale prototype chip (Engineering Run)

Novel interconnection technique (Laser soldering)

46

TPC Upgrade with GEMs

Replacement of wire-chambers with GEM-chambers

• 100 m2 single-mask foils • Limit Ion-Back-Flow into drift

volume • Maintain excellent dE/dx

resolution New readout electronics Keep all other subsystems

Replace wire chambers with quadruple-GEM or 2 GEMs + Micro Megas (full scale prototypes for both in beam in late 2014)

World Largest TPC ALICE key tracking and PID instrument 500 million pixels

47

• New Forward Trigger Detector (FIT)

• New Central Trigger Processor (CTP)

Electronics upgrade for 100 kHz Pb-Pb interaction rate of

• Time Of Flight Detector (TOF)

• Transition Radiation Detector (TRD)

• Muon System

• TOF

• ZDC

Common TDR

Now at UCG review

Upgrade of the other ALICE detectors

48

Muon Spectrometer

Hadron Absorber

μ

μ

The MFT

Muon Forward Tracker

Muon tracks are extrapolated and “matched” to the MFT clusters before the absorber

High pointing accuracy gained by the muon tracks after matching with the MFT clusters

MFT baseline simulation set-up

49

Online-Offline Computing • Online System Requirements

• Sample full 50kHz Pb-Pb interaction rate • (factor 100 increase) • ~1.1 TByte/s detector readout

and ~20 GByte/s to mass storage

• Massive data volume reduction • Classical trigger/event filter approach inefficient • Data reduction by (partial) online reconstruction

• Substantial R&D effort • 13 Computing Working Groups • Design • Process and tools • Simulation

• Computing platforms

• New common online-offline sw framework based

on Open-source packages from the “Big Data” industry • Calibration • Reconstruction • Physics simulation • QA, DQM

50

ALICE UpgradeCommon Projects: cost and MoU

• Cost of common Projects to be shared by the whole collaboration, following the same rules as for M&O A

• MoU sent to FA after last RRB, excellent response! Already signed by 23 FA, corresponding to > 62% of PhD members

• Work progressing rapidly, beampipe design being finalized now

Common Projects Item Cost[MCHF]

Design and engineering 1.1

Installation Manpower 1.0

Services 1.6

Beam Pipe 1.5

Access and Support structures 0.6

Total 5.8

51

Upgrades: CORE investment estimates & timelines

• current best estimate (in 2014 values), final values appear progressively in the TDRs

• Sharing within the projects fixed on the basis of responsibilities, as detailed in the TDRs

• Strong commitment from the collaboration: the know-how and human resources necessary to carry each of the upgrade projects exist. All projects backed by the commitment of large consortia of strong groups. The indications from the funding agencies in response to the group’s funding requests are encouraging, and give us confidence that the necessary funds will be available

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

ALICEUpgradeSpendingProfile

R&D CommonInfrastructure CORE

ALICE upgrade subsystem CORE cost

(MSF)

1. ITS 13.4

2. TPC 9.1

3. MFT 4.1

4. Other projects (Muon, TRD, TOF, FIT, Trigger, etc..)

6.8

5. O2 (online/offline) 9.3

6. Common infrastructure 5.8

Total (MSF) 48.5

R&D costs MSF 7.85

GRAND TOTAL including R&D 56.3

Ongoing support from FA

As in financial report

Thank you!!

52

SUMMARY

• ALICE continues to harvest the results of the HI, pA and pp runs

• The Detector is being substantially improved, to be ready for an exciting RUN2

• The Upgrade plans are defined, the R&D progresses rapidly and TDRs are coming in

We count on your continued support…

THANK YOU!

53

54

spares

55

Offline

• 7.3 PB of raw data collected during RUN1

• 16 PB of derived data on disk (MC, ESD, AOD)

• Average (April-August) CPU usage

– 6% raw data reconstruction

– 9% end user analysis

– 11% centrally organized analysis (Analysis Train)

– 74 % Monte-Carlo production

• For short periods, analysis took up to 50% of the resources

– Wall/CPU time remains > 80%

• Ongoing effort to migrate to SLC6 and switch to a common software deployment tool (CVMFS)

0

2

4

6

8

10

12

14

16

RAW ESD,AOD

Run 1 Data Volume (PB)

RAW

ESD,AOD

Reconstruction

Analysis trains

User analysis

MonteCarlo

56

ALICE getting in line…

57

Mass dependence of parton energy loss

• Charmed mesons (ALICE) vs. J/ from beauty decays (CMS)

First indication of a dependence on heavy quark mass: RAA

B > RAAD

hints for the expected hierarchy in

charm/pion RAA ratio

• Expectation from radiative energy loss: DEg > DEu,d,s > DEc > DEb

• Could be reflected in an hierarchy of RAA: RAA(B) > RAA(D) > RAA(p)

• Charmed mesons (ALICE) vs. Pions

58

D Meson Elliptic Flow

Prompt D0, D+, D*+ average.

D meson v2 suggests collective

expansion.

D meson strongly interacting

with the medium.

Does that mean it flows too?

•v2 is sensitive to the Eq. of state and shear viscosity of the medium.

59

p-Pb at LHC as a control experiment: J/

Pb-Pb (central) p-Pb (minimum bias)

Nuclear modification in p-Pb described by expected PDF shadowing Measurements constrain nuclear modification of PDF at small and very small x

Additional suppression in Pb-Pb, more pronounced at forward rapidity, is a medium effect colour-screening “melts” c-cbar bound states

Reduced suppression in Pb-Pb at central rapidity, wrt forward, and wrt to RHIC measurement described by scenario of J/ regeneration in deconfined medium