Exploitation of hard electromagnetic probes and jets tostudy the QGP with LHC-ALICE
Tatsuya Chujo (Univ. of Tsukuba)
2013 Joint Workshop of the France-Japan (TYL) andFrance-Korea (FKPPL) Particle Physics Laboratories
June 4, 2013
Yonsei University, Seoul,
Republic of South Korea

Outline
1. Introduction
2. What have we learned on QGP so far, and where we go?
3. ALICE experiment and Di-jet Calorimeter project
4. Proposal (LHC_05) in FY2013
5. Summary

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

1. Introduction

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

What is Quark Gluon Plasma (QGP)?
gluon
quark

•
•

De-confined state of quarks and gluon inside hadrons under the extremely
high temperature and energy density•

New and still unknown state of matter.

Lattice QCD calculations:••

Critical temperature: Tc = 150-200 MeV
Crossover phase transition from hadronic phase to parton phase.
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

QuarkGluon
Plasma（QGP）
Time: few μ sec after the bigbang.
Temperature: 2 Trillion K
Energy density: > 1 GeV/fm3

5

Experimental study on QGP by
Relativistic Heavy Ion collisions

LHC-ALICE experiment:
CERN-LHC (2009-), ring length ~27 km
36 countries, 129 institutions,√sNN = 2.76 (5.5 design) TeV Pb-Pb~1,000 collaborators.
2.76, 7.0, 8.0 TeV p-p
The dedicated experiment to HI program
5.02 TeV p-Pb
and QGP study at LHC
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

２. What have we learnedon QGP so far,and where we go?

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

First three years of Heavy Ion Programs at LHC(Run-1 : 2009-2013)• Initial temperature: T ~ 304 ± 51 MeV ~1.4 x T (RHIC).
• Large radial and elliptic flow (ALICE, ATLAS, CMS)
• Large jet quenching effect (ALICE, ATLAS, CMS)
• Disappearance of excited Υ states (evidence for creation of
int

int

high temperature matter, CMS)

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

Jet quenching

3
10-8

10-6

ment non-perturbatively into a set of final-state hadrons. The characteristic colli10
mated spray of hadrons resulting from the fragmentation of an outgoing parton 10
iscalled a “jet”.
10

10-7

-9

-10

10-8

-11

10-9

Jet quenching (energy loss of parton in QGP)
0

2

4

6

8

10

12

14

16

18

20

0

2

4

6

8

10

12

p (GeV/c)

14

16

18

20

p (GeV/c)T

T”hot/dense
QCDmedium”
dnAA/dpandFig. 15. Invariant+0 yields measured
by PHENIX in peripheral(left)
T dycentral (right)
R
=
=
0
AA
AuAu collisions (squares)[89], comparedto the (TAA -scaled)
pp → +· dn+ X crosssection (cir”QCD
vacuum”
Nbinary
pp /dpT dycles) [134] and to a NLO pQCD calculation (curves and yellow band) [119].
RAA

Au+Au - 200 GeV (central collisions):
Direct 2 , 2 * [PHENIX]
Inclusive h± [STAR]+0 [PHENIX]. [PHENIX]g
GLV energy loss (dN /dy = 1400)

10Ncoll scaling

1

10-1

Npart scaling

Fig. 2. “Jet quenching” in a head-on nucleus-nucleus collision. Two quarks suffer a hard scat0
2
4
6
8
10
12
14
16
18
20
p
(GeV/
c
)
１）DDeeccrreeaassee  ooff  hhiigghh  mmoommeennttuumm  ppaarrttiiccllee  tering: one goesout directly to the vacuum, radiates a few gluons and hadronises, the otherTgoes through the dense plasma created (characterised by transport coefficient q̂, gluon density
Fig. 16. RAA (pT ) measured in central AuAu at 200 GeV for +0 [89] and . [135] mesons,dN g /dy andyyiieellddss
temperature T ), suffers energy loss due to medium-induced gluonstrahlung andcharged hadrons [114], and direct photons [136, 137] compared to theoretical predictions for
finally fragments outside into a (quenched) jet.
parton energy loss in a dense medium with dN g /dy = 1400 (yellow curve) [138].

✓•･

NNoo  oobbsseerrvvaattiioonn  aatt  lloowweerr  ccoolllliiddiinngg  
bbeeaamm  eenneerrggyy  ((ee..gg..  SSPPSS))
One of the first proposed “smoking guns” of QGP formation was “jet quench-

top RHIC energies is very close to the “participant scaling”, (N part /2)/Ncoll ≈ 0.17,✓✓

ing” [6] i.e. the attenuation or disappearance of the spray of hadrons resulting fromexpected in the strong quenching limit where only hadrons coming from partons
２）DDiissaappppeeaarraannccee  ooff  bbaacckk--ttoo--bbaacckk  jjeettss  
produced at the surface of the medium show no final-state modifications in their
the fragmentation of a parton having suffered energy loss in the dense plasma prospectra
duced in the reaction (Fig. 2). The energy lost by a particle in a medium, &E, pro- [141]. From the RAA one can approximately obtain the fraction of energy
EEnneerrggyy  lloossss  〜  ffeeww  GGeeVV//ffmm
lost, !loss = &pT /pT , via
vides fundamental information on its properties. In a general way, &E depends both1/(n−2)!loss ≈ 1 − RAA,(36)
on the characteristics of the particle traversing it (energy E, mass m, and charge) andCCaannnnoott  eexxppllaaiinneedd  bbyy  hhaaddrroonn  ggaass.. 1on the plasma properties (temperature T , particle-medium interaction coupling when', the AuAu and pp invariant spectra are both a power-law with exponent n, i.e.
and thickness L),→  OOnnee  ooff  tthhee  eevviiddeenncceess  ooff  QQGGPP  
i.e. &E(E, m, T, ', L). The following (closely related) variables1/p
areT dN/d pT # p−n [142].
pedestal
and flow
At RHIC(n ≈ 8, RAA ≈ 0.2), one finds !loss ≈ 0.2.
T
extremely useful to characterise the interactions of a particle inside a medium:
The high-pT AuAu suppression can be well reproduced by parton energy loss

•･
•･

•
•

ffoorrmmaattiioonn

models that assume the formation of a very dense system with initial gluon ra-

T. Chujo,2013)Jointof FJPPL()(TYL)
Yonsei Univ. Seoul, Korea, June 4, 2013
the mean free path ( = 1/()*),
whereis theWorkshop
medium density# T 3andfor FKPPL,
anpiditydensities dN g /dy ≈ 1400 (yellow line in Fig. 16) [138], transport coeffi2
ideal gas) and * the integrated cross section of the particle-medium interaction,
cients $q̂% ≈ 13 GeV2 /fm (red line in Fig. 17, left) [78], or plasma temperatures
the opacity N = L/( or number of scatterings experienced by the particle in a

Energy losses in QED

IInn  ccaassee  ooff  QQEEDD......

As an illustrative example, we show in Fig. 4 the stopping power of muons in copper. At low and high energies, the collisional (aka “Bethe-Bloch”) and the radiative
energy losses dominate respectively.

Stopping power [MeV cm2/g]

Energy loss of charged particle in a matter

CCoolllliissiioonnaall✓BBeetthhee--BBlloocchh
Bremsstrahlungµ+ on Cu
µ3

10LindhardScharff

100

Bethe-Bloch

RRaaddiiaattiivvee✓BBeetthhee--HHeeiittlleerr

Radiative

AndersonZiegler((tthhiinn;;  LL<<<<λ))✓LLaannddaauu-PPoommeerraanncchhuukk-MMiiggddaall((tthhiicckk;;  LL>>>>λ))Eµc
Minimum
ionization

NuclearlossesRadiative
lossesRadiative
effects
reach 1%

Without 0
1
0.001

0.01

0.1

1

10

0.1

1

10

100

1

[MeV/c]

12

100

1000

10 4

10 5

10 6

10

100

1

10

100

[GeV/c]Muon momentum[TeV/c]✓ ddEE//ddxx  mmeeaassuurreemmeenntt  →  ddeetteerrmmiinnaattiioonn  ooff  mmaatttteerr  pprrooppeerrttiieess
Fig. 4. Stopping
power, −dE/dl, for positive muons in copper as a function of 12 = p/Mc (ormomentum p).
solid curve indicates the total stopping powerDD[15].
ddEE//ddxx  iinn  QQEEDD  ppllaassmmaa  →  ggiivveess  TT  &&  mm• The
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

Yet, the hot and dense plasma environment that one encounters in “jet quench-10(q = CA /CF (g ≈ 1 fm, where CA /CF = 9/4 is the ratio of gluon-to-quark colour
factors). The transport coefficient is therefore q̂ # m2D /(g # 2.2 GeV2 /fm. Notethat such a numerical value has been obtained with a LO expression in 's forthe parton-medium cross section. Higher-order scatterings (often encoded in a
David d’Enterria“K-factor” ≈ 2 – 4) could well result in much larger values of q̂.
theusdiffusionD, characterising
the dynamics of heavy non-relativistic
a numerical QCD example•3, letconsiderconstantan equilibrated
gluon plasma
particlesM andv) traversingthethe plasma, is connected, via the Ein= 0.4 GeV and a strong coupling's ≈(mass
0.5 [10].
At speedthis temperature,stein2 relations
icle (energy) density is )g = 16/+,(3) · T 3 ≈ 15 fm−3 (!g = 8+2 /15 · T 4
2
−3 T
==2T
(3)
7 GeV/fm3 ), i.e. 100 times denser than normal nuclear matterD()
0.15/fm=). /(M .D )1/2 T ≈ 1 GeV. The LO
eading order (LO), the Debye mass
is
m
=
(4+'
)
D
s
to themomentum diffusion coefficient - – the average momentum squared gained
2 /(2m2 ) ≈ 1.5 mb. The gluon mean freeon-gluon cross section is *gg # by
9+'thes particleD
per unit-time (related to the transport coefficient as - ≈ q̂ v) – andh in such a medium is (g = 1/()the*)#
0.45 fmdrag(the coefficientquark mean-free-pathisg ggmomentum.D .
= CA /CF (g ≈ 1 fm, where CA /CF = 9/4 is the ratio of gluon-to-quark colourors). The transport coefficient is therefore q̂ # m2D /(g # 2.2 GeV2 /fm. Note
2.2beenMechanisms
of in-medium
energysuch a numerical value has
obtained witha LO expression
in loss's forparton-medium cross section. Higher-order scatterings (often encoded in aInageneral
way,
the
total
energyloss
ofaparticle traversing a medium is the sum offactor” ≈ 2 – 4) could well result in much larger values of q̂.
4 &E = &E
collisionaltheandradiativeofterms
coll + &Erad . Depending on the kinematic
diffusion constant D, characterising
dynamics
heavy: non-relativistic5
a (colour)chargecan lose energy
a plasma with temperature T mainly byicles (mass M and speed v)region,
traversing
the plasma,is connected,
via theinEin6
two mechanisms .
n relations
D = 2T 2 /- = T /(M .D )(3)

IInn  ccaassee  ooff  QQCCDD::  
EEnneerrggyy  lloossss  iinn  QQGGPP

E-!E
he momentum diffusion coefficient - – theEaverage momentum
squared gained
he particle per unit-time (related to the transport coefficient as - ≈ q̂ v) – andE
momentum drag coefficient .D .

CCoolllliissiioonnaall

EE-!E

!E

chanisms of in-medium energy loss

!E

1

X
neral way, the total energy loss of a particle traversing a medium is the sum of
nal and radiative terms4 : &E = &Ecoll + &Erad . Depending on the kinematic (medium)a (colour) charge can lose energy5 in a plasma with temperature T mainly by
Fig. 3. Diagrams for collisional (left) and radiative (right) energy losses of a quark of energy
chanisms6 .
E traversing a quark-gluon medium.

E

E-!E

•
!E

E

!E

RRaaddiiaattiivvee

Collisional energy loss through elastic scatterings with the medium constituents(Fig. 3, left) dominates at low particle momentum. The average energy loss inE

2

3 For unit conversion, multiply
E-!E by powers of ! c # 0.2 GeV fm (other useful equalities:

10 mb = 1 fm2 , and 1 GeV−2 = 0.389 mb).

4 In addition, synchrotron-,X
Čerenkov- and transition-radiation energy losses can take placerespectively(medium)if the particle interacts with the medium magnetic field, if its velocity is greaterthan the local phase velocity of light, or if it crosses suddenly from one medium to another.
Diagrams for collisional (left) and radiative (right) energy losses of a quark of energy
Also, plasma instabilities may lead to energy losses. Yet, those effects – studied e.g. in [11,sing a quark-gluon medium.
12, 13, 14] for QCD plasmas – are generally less important in terms of the amount of Eloss .
5 Note that if the energy of the particle is similar to the plasma temperature, E ∼ O(T ), theparticle can also gain energy while traversing it.
lisional energy loss through 6elastic
scatterings
with themediumconstituents
Note thatthe separation
is notso clear-cut
since the diagrams assume well-defined asymp. 3, left) dominates at low particle
momentum.
Theoutgoingaverageparticles
energymay
lossstillin be in the medium and further rescatter.
totic outstates, but theE

2
S CR q̂ L

ppQQCCDD• Dominant energy loss is gluon radiation✓ ddEE//ddxx  mmeeaass..  →MMaatttteerr  pprrooppeerrttiieess,,  jjeett  ttoommooggrraapphhyy

nit conversion, multiply by powers of ! c # 0.2 GeV fm (other useful equalities:
b = 1 fm2 , and 1 GeV−2 = 0.389 mb).
dition, synchrotron-, Čerenkov- and transition-radiation energy losses can take place
ctively if the particle interacts with the medium magnetic field, if its velocity is greater
he local phase velocity of light, or if it crosses suddenly from one medium to another.
plasma instabilities may lead to energy losses. Yet, those effects – studied e.g. in [11,3, 14] for QCD plasmas – are generally less important in terms of the amount of Eloss .
that if the energy of the particle is similar to the plasma temperature, E ∼ O(T ), thele can also gain energy while traversing it.
that the separation is not so clear-cut since the diagrams assume well-defined asympout states, but the outgoing particles may still be in the medium and further rescatter.

• Jets and EM probes (photons):➡ Powerful tools for the study of QGP’s properties
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201311

Revealing of new QGP properties
by jet5-1C$+(&/8%&V%4$A#&
At LHC energy:• Hard processes dominant compared to that at RHIC.
• New measurements based on jets
1) QGP medium response by jet propagation.
2) Heavy quark jet, di-jet, gamma-jet.
→jet tomography.

3) Redistribution of lost energy, EOS, velocity
of sound.
_8%+&41%.&/8%&./-1+()0&<1AI)%4&CA)9&D)1S%-&#1#%+/6#&IG/-"+.$61+&/1&"&G%"9)0&<1AI)%4&I-1C%&D=$(=%-&#1#%+/6#&*T
4) Interaction of heavy quark and strongly coupled QGP→ (thermalization, interaction strength)

ALICE Di-jet calorimeter (2015-)
with soft particles↓
Unique measurements by LHC-ALICE
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

3. ALICE experimentand Di-jet calorimeter
upgradeT. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

ALICE experiment (Run-1, 2009-2013)

EMCal
Lead-Scintillator Sampling
CalorimeterΔη = 1.4, Δφ =100o
APD Photosensors

PHOS

TPC
Charged	  par1cles	
  Δη	
  =	
  1.8.
Excellent	
  momentum	
  resolu@on.
Excellent	  PID	
  and	
  heavy	
  ﬂavor	
  tagging.

PWO	
  crystal	  EMC.
220°	
  <	
  φ	
  <	
  320°,	
  Δη	  =	
  0.24high	
  energy	  resolu1on	
  ~3%/√E
γ trigger. T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

ALICE	
  Dijet	  Calorimeter	
  (DCal)•Extension of the acceptance of EMCal .

•Lead-scintillator sampling type EMC with
APD readout.
– EMCal: Δφ = 113°
– DCal: Δφ = 66° (on opposite side of
EMCalàgood uniformity, less sys.
uncertainty)– Δη = 0.7 for both EMCal and DCal +PHOS– Energy resolution: ~10%/√E

PHOS

•

Allow back-to-back hadron-jet, di-jet
measurements in ALICE, with R = 0.4 jetcone radius, up to pT ~ 150 GeV/c.

DCal

•

Enhance jet, γ trigger capability.

•

Full energy scale for γ: 250 GeV.

15

ALICE-DCal Collaboration
China
Huazhong Normal University (CCNU), Wuhan
Finland
University of Jyvaskyla
FranceLPSC Grenoble, Subatech Nantes, IPHC Strasbourg
Italy
INFN Catania (Armando Palmeri, Angela Badala), LNF Frascati (Alessandra Fantoni)
Japan
Hiroshima University, University of Tokyo, University of Tsukuba
Switzerland
CERN
USA
Lawrence Berkeley National Laboratory, Wayne State University, University of Houston,
University of Tennessee, Lawrence Livermore National Laboratory, Yale University, Oak
Ridge National Laboratory, Creighton University, Cal Poly San Luis Obispo, Purdue University
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201316

France-Japan collaboration for ALICE-DCal
Institute & People(2008-)LPSC Grenoble (FR)• Christophe Furget• Jean-François Muraz
Subatech Nantes (FR)• Manoel Dialinas• Magali Estienne

DCal SM platform (LPSC)

DCal support structure (Subatech)

IPHC Strasbourg (FR)• Christelle Roy
Tsukuba (JP)DCal SM shipping crate (LPSC)• Y. Miake, S. Esumi, M. Inaba, T. Chujo

Contributions to DCal
LPCS Grenoble:- module straps, SM cables, platform,- shipping boxes,SM assembly, Calibration

DCal installation tool (Subatech)

DCal straps (LPSC)
Subatech Nantes:• DCal SM installation tool, support structure, integration• DCal strip module production, DCal strong backTsukuba:
DCal weight cal. (Subatech)• DCal module production
(1
1/3
SM
out
of
6
+
2/3
SM)
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201317

2011.07 (Tsukuba,2011.07
JP)

All modules are stored in
Grenoble & CERN.
←2012.12 (done by LPSC, Grenoble)
APD gain calibration (dispersion <1.2%)←2011.07 (@ Univ. of Tsukuba, DCal Super modules
2013.03 (LPSC, Grenoble)
final shipping prep.)
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201318

← DCal SM insertion test

2013.05 (CERN, P2)
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201319

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201320

Load test of DCal support frame
2012.10 (CERN, P2)
1.35 * nominal load (6 DCal supermodules + .4
PHOS modules + 2 DCal minisupermodules).
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201321

DCal support frame
2013.05 (CERN, P2)
SM insertion test is underway.
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201322

Space for DCal (and PHOS)
DCal installation schedule:• Sep. - Oct. 2013: installation of 1st 3 SM + 1/3 SM (C-side).
• Dec. 2014 (TBD): installation of 2nd 3 SM +1/3 SM (A-side).
• Physics data taking will start from LHC Run-2 (2015-).
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201323

Perspec've	
  of	
  physics	
  with	  DCal:	
  Medium	
  response	
  with	  jets3+1 hydro + jet (Tachibana, Hirano) QM2012• Excellent hadron PID (0.15 – 20 GeV/c) and photon ID, suitable detector tomeasure the medium response with jet ID triggered by EMCal.

• Bulk properties (PID spectra, vn, HBT, etc.) with a large jet energy imbalance.
• Key to access cs, EOS?

4. Proposal (LHC_05)
in FY2013

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

LHC_05 Members

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

Activities in FY2012 (+FY2013)• DCal:-

EMCal (DCal) new readout electronics, SRU (Scalable
Readout Unit, SRU), tested at CERN and Tsukuba.

-

Installation and test of SRU at P2 (EMCal) (Apr-May,2013).

• Data analysis:-

SRU board for
ALICE-EMCal/DCal

π0-jet, hadron-jet correlations in p-p, Pb-Pb.
Developed analysis with Grenoble group.

-

One M2 student (Tsukuba) and a staff (TC) stayed at
LPSC Grenoble (2 weeks, Mar. 2013)➡FJPPL support in 2012

π0-jet correlations in p-p(D. Watanabe)

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

Our proposal in FY2013

1) DCal installation and commissioning (including SRU readout) at CERN.
2)Collaboration with French Groups for jet/ direct photon analysis.
➡ FJPPL + JSPS-CRS bilateral research program (2013-2015, rep. TC)➡ Plan to have a France-Japan mini-workshop on ALICE data analysis in Japan in this fallor winter.

✓ Request for funding for travels (Japan(both Japan, France)

France) and staying cost

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

Summary✓ ALICE Di-jet calorimeter (DCal) project is wellproceeded, France-Japan collaboration keeps
playing an important role in this project.
✓ DCal will be installed during LS1 (2013-2014), and startphysics data taking from LHC Run-2 (2015-).
✓ Expected unique physics programs using di-jet andphotons with soft particles.
- QGP medium response by jets, jet tomography, EOS
etc..
✓ Requested travel support in FY2013 to keep this strong
and excellent collaboration between France and Japanfor both detector and data analysis in ALICE.
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 201329

Back up slides

T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

DCal Activities at Tsukuba (History, 2008-)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Dec. 2008: Visited Wayne State Univ., and leaned how to build EMCal.
Feb. 2009: DCal presentation to the ALICE Upgrade management.
Mar. 2009: DCal presentation to the ALICE MB (also at ALICE upgrade forum).
Jun. 2009: Official proposal submitted to ALICE MB/CB, one SM approved.
Oct. 2009: ALICE MB/CB approved 6B configuration. The orders of the major
components have been completed.
Aug. 2010: All components delivered (delayed due to Scint. production).
Oct. 2010: Started mass production at Tsukuba.
Nov. 2010: Send materials to Catania, and assemble (2 people from Tsukuba)
Nov. 2010: Catania team visited Tsukuba
Feb. 2011: First shipping.
(Mar. 2011): Earthquake
May 2011: Restarted module assembly
Jul. 2011: finished module assembly in Tsukuba, and shipped to Nantes.
Aug.-Sep. 2011: Tsukuba people worked at Grenoble and Nantes.
Feb. 2012: First Japanese DCal super module has been fully calibrated at
Grenoble.
T. Chujo, 2013 Joint Workshop of FJPPL (TYL) and FKPPL, Yonsei Univ. Seoul, Korea, June 4, 2013

DCal	
  components

32