ALICE Activities
atTsukuba

E DCal Proposal Revision 0.0

March 2010

Yasuo MIAKE
Univ. of Tsukuba

YasuoviewMIAKE,March
2011,
Yonsei,onSeoul
Perspectiveof the DCaland7,PHOS
integrated
a common support. As

1

Thanks
Jihyun Bhom

✓Jihyun Bhom (Yonsei)
joins Doctoral program,
Univ. of Tsukuba in April,
2011.

✓She has been working on
DCal production sincelast fall at tsukuba.

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

2

Outline✓Introduction• 3 highlights @ RHIC with my biased view
➡1) jet quenching➡2) v2➡3) shock wave?

✓Activities related to ALICE at Tsukuba→ Maya Shimomura• v2 analysis• v2 and higher harmonics→ ShinʼIchi Esumi• Jet analysis• Test beam

✓Status of Dcal production at Tsukuba
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

3

Introduction
3 highlights@RHIC

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

41) Jet quenching
RAA =”hot/dense QCDmedium”
dnAA /dpT dy=”QCD vacuum”
�Nbinary � · dnpp /dpT dy~ 0.2

Fig. 2. “Jet quenching” in a head-on nucleus-nucleus collision. Two quark
tering: one goes out directly to the vacuum, radiates a few gluons and hgoes through the dense plasma created (characterised by transport coeffici
dN g /dy and temperature T ), suffers energy loss due to medium-induced
finally fragments outside into a (quenched) jet.

One of the first proposed “smoking guns” of QGP formationing” [6] i.e. the attenuation or disappearance of the spray of hadro
the fragmentation of a parton having suffered energy loss in the dduced in the reaction (Fig. 2). The energy lost by a particle in a mvides fundamental information on its properties. In a general way,on the characteristics of the particle traversing it (energy E, mass mpedestaland (temperature
flow
on the plasma
properties
T , particle-medium interacand thicknessL), i.e. !E(E, m, T, ", L). The following (closely rel
subtracted
Star; P.R.L. 91, 72304 (2003)
extremely useful to characterise the interactions of a particle insid

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

pTtrig = 4˜6 GeV/cpTassoc > 2 GeV/c5ergy losses in QEDEnergy loss contains rich physics

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

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

Stopping power [MeV cm2/g]

Energy loss of charged particle in a matter

Bremsstrahlungµ+ on Cuµ(

10LindhardScharff

100

Bethe-BlochCollisional✓Bethe-Bloch28

Radiative

AndersonZiegler

Eµc
Minimum
ionization

NuclearlossesRadiative
lossesRadiative
effects
reach 1%

Without %
1
0.001

0.01

0.1

1

10

0.1

1

10

100

1

[MeV/c]

&'

100

1000

10 4

10 5

10 6

10

100

1

10

100

[GeV/c]Muon momentum

Radiative✓Bethe-Heitler(thin; L<<λ)✓LandauPomeranchukMigdal(thick; L>>λ)[TeV/c]✓

4. Stopping
power, −dE/dl, for positivein coppergives
as a functionof &' = p/Mc
Measurements
ofmuonsdE/dx
prop.
of (ormattermentum p). The solid curve indicates the total stopping power [15].

• Energy loss in QED plasma gives T & mD info.

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

6

AA AA

AA AA=R0.4.
There
are aresignificant
diﬀerences
betweenkT andanti-k
= 0.4.
Theresignificant
diﬀerences
betweenkT andanti-kT algoT a

Jet quenching in Jets?
Au+Au:
10% most
Au+Au:
10% central
most central

1

10-1

1

STAR
Preliminary
STAR
Preliminary

kt R=0.4
kt R=0.4
anti-ktanti-kt
R=0.4 R=0.4
kt R=0.2
kt R=0.2
anti-ktanti-kt
R=0.2 R=0.2

10-1
10 1510 20
15 25
20 3025 35
30 40
35 4540 50
45

50

Jet
pJet
(GeV/c)p(GeV/c)T
T

Yield Ratio: R=0.2/R=0.4

Au+Au
and p+psNN
GeV/cGeV/c
Au+Au
andatp+p
at=200sNN=200

Yield Ratio: R=0.2/R=0.4

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

RJet
AA

RAA

om
theirtheirdiﬀerent
response
to theheavy-ionbackground.
from
diﬀerent
response
to theheavy-ionbackground.

0.8

Au+Au
and p+p
GeV/cGeV/c
Au+Au
andat
p+psNN
at=200sNN=200

0.8

F
i
s
A
√

Au+Au
kt
Au+Au
kt
Au+Au
anti-ktanti-kt
Au+Au
0.7 0.7
p+p ktp+p kt
STARPreliminary
STAR
Preliminary
p+p anti-kt
p+p anti-kt
0.6 0.6
Au+Au:Au+Au:
10% most
10%central
most central

28

0.5

0.5

0.4

0.4

0.3

0.3

0.2

0.2

0.1

0.1

15

20
15

25
20

30
25

35
30

40
35

45
40

50
45

a
0
R
R
s

50

Jet
pJet
(GeV/c)p(GeV/c)T
T✓Broader distribution of Jets in AA
Figure3(rightpanel)
shows
the
ratio
of
jet
yield
for
R
=
0.2
over
tha
Figure3(rightpanel)
shows
the
ratio
of
jet
yield
for
R
=
0.2
over
We
look
for
higherjetenergy✓Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

72) v2By Maya Shimomura✓Beautiful systematics• Holds up to very high pt, where hard components and jet might
be important➡ M. Shimomura, “ALICE v2 and RHIC v2 results”• Interplay of soft and hard ?
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul→

ShinIchi Esumi
83) Shock wave ?
PHENIX, arXiv:0705.3238 [nucl-ex]✓Location & <pt> of the shoulder seem to be independentof centrality and pt.
✓Shock wave or triangular flow due to initial fluctuation➡S. Esumi, “Elliptic and triangular flow measurements”
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

9inated by valence-quarks (by “wee” gluons) and consequently hadroproduction isdominated by quark (gluon) scatterings. A full NLO calculation [119] (Fig. 22, left)
predicts that hadrons with pT ≈ 5 GeV/c at SPS (LHC) energies are ∼100% produced by quarks (gluons), whereas at RHIC they come 50%-50% from both species.
RAA (p = 4 GeV/c)parton ! hadron+X at pT = 5 GeV/c :1gluonsquarks0.9
0.8

Pb+Pb ! "0+X 0-7% central [WA98]
Pb+Au ! "±+X 0-5% central [CERES]
Au+Au ! "0+X 0-10% central [PHENIX]

1
0.7
0.5

T

relative parton (q,g) contribution

RHIC vs LHC

0.7
0.6

SPS

0.5

RHIC

LHC

0.4

0.3
0.2
0.1
Energy loss: # Eg / # Eq = 9/4

0.3

Energy loss: # Eg = # Eq

0.2
0.1

NLO pQCD, KKP FF [W.Vogelsang]

0.01

0

10

2

10

3

10

s (GeV)

102

3

10

sNN (GeV)

Fig. 22. Left: Relative fraction of√quarks and gluons fragmenting into a hadron at pT = 5 GeV/c
in pp collisions in the range s = 10 – 5500 GeV given by NLO pQCD [119]. Right:
moreforgoodiesinAA
soft
components
aloneenergy(prejudice)RAA (p= 4 GeV/c)"0 in central
collisions
as function of collisioncompared•TNo
to non-Abelian (solid) and “non-QCD” (dotted) energy loss curves [153, 165].

• LHC has superior advantage in hard components

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

10

DCal as an extension of
EM-Cal✓For better performanceIV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

of back-to back capability➡Define back-to back jets
➡Trigger back-to back jets

ALICE EMCAL

28✓Progress• Proposed in Feb.,09• Discussed w. IN2P3 in May,

Extension proposed

DiJet Calorimeter
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

09• Discussed in March,09• Proposal in May, 09• Partial approval in July, 09• Full approval by ALICE in
Oct. 09✓Construction started !
11

Energy resolution

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

PYTHIA8, detector resolution included✓Statistical

Rcone = 0.2

fluctuation in
neutrals determines
the resolution.
✓D-Cal improves theresolution from˜45% to ˜35%
✓Imbalance inenergies provides
information on thepartonic energy
loss.
28

TPC - TPC

TPC - EMC
J-Cal - EMC
γ-Jet: J-Cal - EMC
Dijet Intrinsic

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

11

What we expect;
Reach of Jet Energy

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

G
00
~1

~2

00

G

eV

eV

28

✓For 104 events/year in Pb+Pb@5.5TeV,• Inclusive jet up to 200 GeV• Di-Jet to 100 GeV

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

13

Control variables for AA

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Since heavy ion collisions is so complicated,while there is no ʻstandard modelʼ, we needto measure heavy ion collisions w. many
control variables.
28• Centrality / impact parameter of collisions• Reaction Plane Angle• Yet, another control variable for the next
generation experiments ;Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

23

Control variables for AA

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Since heavy ion collisions is so complicated,while there is no ʻstandard modelʼ, we needto measure heavy ion collisions w. many
control variables.
28• Centrality / impact parameter of collisions• Reaction Plane Angle• Yet, another control variable for the next
generation experiments ;→ Jet Axis
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

23

Activities related
to ALICE at
TsukubaMasato Sanov2 analysis→ Masato Sano
→ Maya Shimomura
v2 and higher harmonics→ ShinIchi Esumi
Jet analysis→ Tatsuya Chujo→ Dousatsu Sakata
Test beam→ Kaoru Gunji

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

Dousatsu Sakata

Kaoru Gunji 15

Dousatsu	
  Sakata	
  2nd	
  grade	
  student	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  of	
  doctor	
  course	
  (Tsukuba)
Junior	  Research	
  Associate	
  (RIKEN)

Njet/dpTdηJet	
  Yield	
  using	
  an2-­‐kt	
  (p+p	  √s	
  =	  7TeV)	
  
R=1.0
R=0.8
R=0.6
R=0.4
R=0.2

(It’s	  not	
  adopted	
  unfolding)Detector	  Contribu2on	   *	
  DCS	
  development	
  of	
  TRD
Analysis	  Subjects
	   *	
  Jet	
  Algorithm	
  Study	   *	
  Jet	  Spectrum	
  &	
  Jet	  RAA	  	
   *	  Jet	  modiﬁca2on	
  
	
   	
   -­‐	  Jet	
  Energy	  	
   	
   -­‐	  Jet	
  Broadness	  Start looking at Dijetin pp@7TeV
Tatsuya Chujo

ALICE performance
Uncorrected
30/08/2010✓First look at Dijet in pp 7 TeV✓In128 M M.B., single jet up to pT ˜ 70 GeV/c,dijet mass < 50 GeV/c2 observed
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

17

Test beam experiment of EMCal
Kaoru Gunji

・participated in test beam experiment with
CERN-PS/SPS in Aug, 2010.
・analyze Energy and timing resolution.

sigmaE/E*100[%]

Energy Resolution

r2 / ndf
p0
p1

17.25 / 4
1.499 ± 0.04442
9.752 ± 0.1818

108Clustering

simulation
6

data(fit)

4

50GeV/cEMCaltimingresolution

358.8±8.4[ps]

2

0

0

20

40

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

60

80
100
momentum[GeV/c]

18

Status of DCal
production at
Tsukuba
Tatsuya Chujo
DCal – 6 super modules

Δη~0.74
3
2

PHOS – 5 modules

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

ALICE DCal Proposal Revision 0.0

Why not
here?

March 2010

Table V.1 Proposed individual group responsibilities for the major national groups
participating in DCAL.
Group
USA

Group Leader
T.J. Symons, LBNL

Japan
FranceY. Miake, Tsukuba
C. Roy, IPHC Strasbourg

China
Italy

D. Zhou
N. Bianchi

Proposed Responsibilities
3 super modules
Detector design
Overall project management
Project technical coordination
DCal LED system
1.5 super module
0.5 super modules
Support structure design, fabrication
Oversight and payment of up to 2/3 thecost
Installation tooling design
Installation oversightJet trigger Design, hardware and integration
SM integration and cosmic calibration
1 super module
Module assembly
19
Fiber production facilities

Box of Lead Tiles on the floor
Due to the load capacity of the floor,,,,20

DCal structure

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

Lead
28

Paper

Scint.

ALICE DCal Proposal Revision 0.0

4 APD/module
Module (77 layers)
March 2010

Strip (12 modules)

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

DCal (6 S.M.)

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

S.M. (192 modules)
21

Why it is time consuming
Holes of lead tiles and scintillators need
to be aligned
1.2mm holes for 1mm fibers
Enough tension among lead tiles andscintillators by stainless plate on theside to keep the Assembledalignmentinevenat 45
Grenoble/degree position Nantes
no glue in between for better opticaltransmission
Control of tension is very important
Lead tile is soft.
Height of the stacks shrinks in time
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

22

Cleaning of Lead Tiles in Jun. – Jul., 2010
 Every lead tile cleaned with ethanol in supersonic cleaner
Sanshiro Mizuno

Cleaning Lead Tile (Jun. 21 - Jul. 22)>20k tiles>100 liter ethanol
Tomo Nakajima

23

Yasuo MIAKE, Nov.8,2010

Tsukuba team at Catania in Oct.-Dec,2010
 Module Assembly & APD assembly/calibration at Catania
 Assembly of modules (96 modules, 1/2 S.M.)
 APD assembly & calibration (2400)
Hiroki & Maya at Catania fir APD & module assemblyMaya Shimura

24

Hiroki Yokoyama

Yasuo MIAKE, Nov.8,2010

Tsukuba team at Catania in Oct.-Dec,2010

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Completed 96 modules production with Cataniaʼs help.
✓APD assembly/calibration for 2,400 APDs with Angela
B.ʼs team

28

Hiroki & Maya at Catania

Strip assembly
also done at
Catania, thenship to France.
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

25

First Module assembled at Tsukuba
Oct 27,2010
 November: Load cell pressure control system (4+1 spare & calibration) is ready touse (Nov. 1).
 Finished 3 modules assembly in Tsukuba by using the US assembly
station only (as of Nov. 5).
ShintaroKubota
Make a documentation of module assembly procedure in Tsukuba andcheck sheet (Nov. 5).

 Ready tostart the module assembly w. 2 stations (w/ new table, load cell
(77 layers)
Pb + scint.

system, guide wires, actuator etc.) (Nov. 5).

 Preparation of dummy strong backs & shipping crates at local workshop.
 Discussing with Jean-François on charge for cable etc. from FY10

fonduing in Japan.

Assembly station(from WSU)

26

Yasuo MIAKE, Nov.8,2010

Pressure in the first 24 hours(on the station)

27

Yasuo MIAKE, Nov.8,2010

Pressure in the first 24 hours(on the station)

27

Yasuo MIAKE, Nov.8,2010

Pressure in the second 24 hours(off the station)

28

Yasuo MIAKE, Nov.8,2010

Pressure in the second 24 hours(off the station)

28

Yasuo MIAKE, Nov.8,2010

3rd assembly work in smoothand confident

Shintaro Kubota

Jihyun Bhom

29

Yasuo MIAKE, Nov.8,2010

Temperature
Problem ?
 To check stability, pressure

14:00 24:00
10/31(Sat)

30

12:00
10/31(Sun)

24:00

12:00
11/1(Mon)

monitored for 2 days,
from 10/31(sat) 14:17
to 11/1(mon) 14:17.
 Is this due to pressure(load)sensor ? or thermal
expansion?
 Need better temperature
control?

Yasuo MIAKE, Nov.8,2010

Francesco	
  N.	
  &	
  Maurizio	
  S.	
  from	  Catania,	  visited	
  Tsukuba	
  (Nov.	
  11-­‐18,	
  2010) Francesco & Maurizio

visited Tsukuba in Nov.
9-17, 2010
 Second assemble station
becomes operational

31

Yasuo MIAKE, Nov.8,2010

Module	  assembly	
  room	  in	
  Tsukuba
Module	  for	
  2nd	
  24hr.	
  compression	  Module	  for	
  2nd	
  24hr.	
  compression	  Modules	
  for	
  ﬁrst	  24hr.	
  compression	
  Assembly	
  Sta:on	  from	  Catania

Assembly	
  Sta:on	  from	  Wayne	  State73	
  DCal	  modules	
  in	
  Tsukuba	
  
(as	
  of	
  Jan.13,	
  2011)

Q.A. of module production

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Width28• < 120 mm✓Pressure• 13 modules
need to be
re-tuned

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

34

Manoel	
  Dialinas	
  from	  Subatech,	
  visited	
  Tsukuba	
  (Feb.	
  8-­‐12,	
  2011)
 Manoel visited us for the final Q.A. checkjust before the first shipping Second assemble station becomes
operational
T.Gunji S.Horiuchi T.Niida
T.Nakajima

R.Takeuchi

A few modules found to
be bad out of 96
modules35

Yasuo MIAKE, Nov.8,2010

Jihyun Bhom

Shipping	
  Fes>val
Takahumi Niida

Satoshi Horiuchi
Sanshiro Mizuno
Shintaro Kubota

Tomo Nakajima36˜ 1 ton/Box
37

Bad	
  news	  came	  inDamage	  during	
  handling	
  at	
  airport

38

Arrived	
  at	
  Subatech,	  March	
  2,	
  2011
Damages are wooden box only. Modules are OK.

39

All the modules sitting safely,
peacefully at Subatech

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

28

March 3, 2011

✓No “slipped disk” during
the transportation
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

40

Two students from Tsukuba will be sent to Subatech in May˜June.

4

Yet, another type of collaboration✓Education ! Education ! Education !
✓Everybody agrees that international

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

28

collaboration is effective place for theeducation.

✓I just learned there is a plan/idea forinternational cooperative master degree
program between Japan-Korea-Germany.
『日独韓共同修士学位プログラム』✓We may consider similar program for our future
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

42

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

Thanks to Prof. Aizawa,
Literature and Linguistics

人文社会科学研究科・国際日本研究専攻
International and Japanese Studies✓TEACH ;Transnational European and East

28

Asian Culture and History• Initiated by Germany, DAAD.
• Master degree program (3˜6 students/univ./year)➡3-18 students move together and attend lectures.
Lectures are given either in German, Korean or Japanese• Dual degree program➡One master thesis is evaluated at two universities;i.e., master degree from Tsukuba and Bon.
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

43

Real dual degree program

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Real Dual degree program in medical science✓Tsukuba and National Taiwan Univ.
✓Officially start in this April 2011.
✓Master program and Doctoral program28• 3 years to graduate master degree but obtain two
degrees.

➡2011.4 Enter master program at Tsukuba, study at Tsukuba for
the first semester➡2011.9 Enter NTU➡2013.8 Graduate NTU and obtain degree➡2013.9 Resume at Tsukuba➡2014.3 Graduate Tsukuba and obtain degree
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

44

A dream ; Japan-China-Korea
cooperative graduate school

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

✓Similar program, but our case might be easierthan TEACH
28• existing international activity, common field,
common place of activity, common language• exchange units of lectures• authorize ourselves as guest? professor each
other✓Dual degree• one master thesis certified from 2 universities
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

45

ALICE like CDF

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

28✓Full coverage• Plug• Central✓Azimuthally
symmetric.
http://www-cdf.fnal.gov/events/detintro.html

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

46

e
u
g

A

n
a
s

o
l
i
ep

ALICE like CDF

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

28✓Full coverage• Plug• Central✓Azimuthally
symmetric.
http://www-cdf.fnal.gov/events/detintro.html

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

46

Backups

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

47

the particle per unit-time (related to the transport coefficient as ( ≈ q̂ v) – and"byg &gg ) # 0.45 fm (the quark mean-free-path ismomentum drag coefficient )D .
/Cthe
F = 9/4 is the ratio of gluon-to-quark colouris therefore q̂ # m2D /'g # 2.2 GeV2 /fm. Notebeenobtained witha LO expression
in loss!s forMechanisms
of in-medium
energyHigher-order scatterings (often encoded in a
ault
generalway,
the values
total energy
in muchlargerof q̂. loss of a particle traversing a medium is the sum of
4 : *E = *Elisionalthe
anddynamics
radiativeofterms
erisingheavy
non-relativisticcoll + *Erad . Depending on the kinematic
5ion, a (colour)chargelose energy
a plasma with temperature T mainly byaversing
the plasma,is canconnected,
via theinEin6
o mechanisms .
T 2 /( = T /(M )D )(3)

Energy Loss in QCD

E-!E
ent ( – theEaverage momentum
squared gained
ed to the transport coefficient as ( ≈ q̂ v) – andE.
!E

gy loss

Collisional

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

!E
E-!E
28

of a particle traversing a medium is the sum ofX= *Ecoll + *Erad . Depending on the kinematic (medium)rgy5 in a plasma with temperature T mainly by. 3. Diagrams for collisional (left) and radiative (right) energy losses of a quark of energy
raversing a quark-gluon medium.

E!E

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

E-!E by powers of ! c # 0.2 GeV fm (other useful equalities:
For unit conversion, multiply
10 mb = 1 fm2 , and 1 GeV−2 = 0.389 mb).
X
In addition, synchrotron-,Čerenkov- and transition-radiation energy losses can take place(medium)
respectively 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.
radiative (right) energy losses of a quark of energy
Also, plasma instabilities may lead to energy losses. Yet, those effects – studied e.g. in [11,12, 13, 14] for QCD plasmas – are generally less important in terms of the amount of Eloss .
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.
asticthatscatterings
with themediumconstituentsNotethe separation
is notso clear-cut
since the diagrams assume well-defined asymprticle
momentum.
Theoutgoingaverageparticles
energymay
lossstillin be in the medium and further rescatter.
totic outstates, but the✓Many theories on• Collisional loss
• Radiative loss

wers of ! c # 0.2 GeV fm (other useful equalities:mb).
nd transition-radiation energy losses can take placeh the medium magnetic field, if its velocity is greaterr if it crosses suddenly from one medium to another.
nergy losses. Yet, those effects – studied e.g. in [11,erally less important in terms of the amount of Eloss .
s similar to the plasma temperature, E ∼ O(T ), theversing it.
cut since the diagrams assume well-defined asympes may Yasuo
still be inMIAKE,
the medium
and further
rescatter.
March
7, 2011,
Yonsei, Seoul➡Bethe-Heitler regime➡LPM regime➡“dead-cone”effect∆E ∝ αS CR �q̂�L2(Executive) Summary
Radiative loss is dominantEﬀects are;•suppression of high pt hadron•unbalanced back-to back•modiﬁcation of jet fragmentation
softer, larger multiplicity,
angular broadening∆Egluon > ∆Equark > ∆Echarm > ∆Ebottom 48

EMC-2

Beam View

EMC-1

EMC-3

✓5 contiguous
6

modules possible,
while exact backto-back is 3

g
e
d
0

EMC-5

g
e
d
60
JCal-3JCal-1

Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

JCal-249

E1JET

What we expect;sensitivity!

IV.2 Perspective view of the DCal and PHOS integrated on a common support. As
discussed in the text, the support structure is a component of the full international project
scope. Five PHOS modules are shown although only three, those contiguous with theproposed DCal, are installed in ALICE at the moment and considered part of DCal.

E1JET − E2JETBalance ≡1/2(E1JET + E2JET )

28

E2JET

hing” in a head-on nucleus-nucleus collision. Two quarks suffer a hard scatout directly to the vacuum, radiates a few gluons and hadronises, the otherdense plasma created (characterised by transport coefficient q̂, gluon density
erature T ), suffers energy loss due to medium-induced gluonstrahlung andoutside into a (quenched) jet.

Figure II.7 Distribution of di-jet energy balance ! for quenche(qhat = 50 GeV2/fm), for DCal jet energy threshold of 100 GeVbars show the statistical precision of the signal for 0.5 nb-1 offirst proposed “smoking guns” of QGP formation was “jet quenchattenuation or disappearance of the spray of hadrons resulting fromon of a parton having suffered energy loss in the dense plasma proction (Fig. 2). The energy lost by a particle in a medium, !E, protal information on its properties. In a general way, !E depends both
istics of the particle traversing it (energy E, mass m, and charge) androperties (temperature T , particle-medium interaction coupling1 ",), i.e. !E(E, m, T, ", L). The following (closely related) variables are
l to characterise the interactions of a particle inside a medium:ee path # = 1/($%), where $ is the medium density ($ & T 3 for an
nd % the integrated cross section of the particle-medium interaction2,
N = L/# or number of scatterings experienced by the particle in ahickness L,
ass mD (T ) ∼ g T (where g is the coupling parameter) is the inverse ofg length of the (chromo)electric fields in the plasma. mD characterises
Yasuo MIAKE, March 7, 2011, Yonsei, Seoul

Pb+Pb (0-10% central collisions). Solid line represents a fit totruncated Gaussian function.
!
!
!
!

✓ Sensitiv
ity indata of1 year!

50

France-Japan collaboration for ALICE-DCal
Institute & People
LPSC Grenoble• Christophe Furget• Jean-François Muraz

DCal SM platform (LPSC)

DCal support structure (Subatech)

Subatech Nantes• Manoel Dialinas
IPHC Strasbourg• Christelle RoyContributions to DCal

DCal SM shipping crate (LPSC)

LPCS Grenoble:-DCal module straps-DCal supper module (SM) cables-DCal platform, shipping boxes-DCal SM assembly

DCal installation tool (Subatech)

DCal straps (LPSC)
Subatech Nantes:•DCal SM installation tool, support structure, integration•DCal strip module production, DCal strong back
DCal weight cal. (Subatech)2