[PPT] - Scintillator Calorimeter for LC Tohru Takeshita Shinshu U. for PowerPoint Presentation

SLIDE 1

Scintillator Calorimeter for LC

Tohru Takeshita Shinshu U. for GLDCAL & scecal+AHCAL/CALICE TT CLIC-WS 09 @ CERN

PFA calorimeter ECAL & HCAL current and future study

Shinshu University ILC

ILC to CLIC HE, BG & BX

SLIDE 2

Jet physics at HE

e Z H e

q q q q e+e- > ZH at 500GeV qqqq

TT CLIC-WS 09 @ CERN

High Energy e+ e- collision in LC (~TeV)
relevant physics final states
W/Z/H/top which emerges as jets
need to identify its origin
required 3%~(rms jet)/Ejet
separate W from Z
guiding principle : PFA
PFA requires specifically optimal detector

severer on CLIC

SLIDE 3

Particle Flow Algorithm

Charged particle : pion,Kaon: Tracker :65% of Ejet
neutral : photon: ECAL :25% of Ejet
neutral: Ko,n: HCAL: 10% of Ejet
jet energy resolution : HCAL

1 10 10 2 10 3 10 4 20 40 60 80 100 ID Entries Mean RMS UDFLW 3000 37960 3.621 6.015 0.000

e+e->ZH 250GeV particle energy (GeV) charged charged photon photon neutral neutral hadron hadron

0.001@10GeV 0.05@10GeV 0.2@10GeV

error propagation

0.0001 0.001 0.01 0.1 1 1 10 100 1000 resolution momentum (GeV)

momentum / energy resolution HCAL ECAL Tracker

TT CLIC-WS 09 @ CERN

SLIDE 4

PFA requirements

need to separate charged and neutrals in

calorimeter

cluster overlapping in 3D.
tracking in CAL
fine segmentation

~1x1 cm2

longitudinal and lateral
photon separation in ECAL
neutral hadron isolation

1cm x 1cm segmentation in E & H CALs ECAL HCAL Tracker TT CLIC-WS 09 @ CERN smaller on CLIC ４D for CLIC with timestamping

SLIDE 5

granularity

 ECAL < 1x1cm2

GLD pi-zero dx(cm)

4GeV 10 20 50

1cm 1cm

M. Thomson

3cm

20GeV r0

TT CLIC-WS 09 @ CERN smaller on CLIC

SLIDE 6

granularity

 HCAL ~ 3cm x 3cm

M. Thomson

jet energy resolution

TT CLIC-WS 09 @ CERN no leak on CLIC Ecm=500GeV

SLIDE 7

 current implementation by scintillator with

Wave length shifting fiber

 ECAL : strips : extruded  1cm x 4.5 cm x 0.3 cm  X-Y strips effective 1cm2  HCAL : tile : molded  3cm x 3cm x 0.5cm

GLD-ECAL-Scintillator-layer model

TT 1/April/06

particles

X-Layer Z-Layer

1cmx4cmx2mm 1cmx4cmx2mm

MPPC R/O with WLSF MPC R/O with WLSF absorber plate

How to fulfill

TT CLIC-WS 09 @ CERN

SLIDE 8

scintillator strip ECAL

 extruded by KNU  MPPC read out

EM-Scintillator-layer model

TT Oct 07

Cross section MPPC Tungsten MPPC WLSF scintillator Flex-sheet Tungsten Tungsten particle

1cm 4cm ASIC ASIC calib.

MPPC WLSF

1cm 4.5cm 1cm

MPPC

TT CLIC-WS 09 @ CERN

SLIDE 9

photo-sensor

new type of photon sensor : Geiger Mode APD

a pixel high gain ~ 10 blue sensitive low Voltage ~<100V small ~1mm insensitive to mag.

n++ p-epi p+

123456789......................40

# of p. e. = # of pix

5~6 2

MPPC pict

n++ p+

1mm 1mm TT CLIC-WS 09 @ CERN good time resolution < 1ns more pix on CLIC

SLIDE 10

 scintillator strip ECAL  18 x 18 x 26 cm3  tested at FNAL MT6 2008+09  2160 ch.

prototype module

MIP ADC TT CLIC-WS 09 @ CERN

SLIDE 11

Beam momentum ( GeV/c )

10 20 30

Deposit energy in ECAL (MIP)

1000 2000 3000 4000 5000

0.01 ( uniform ) ± Slope = 142.37 0.01 ( center ) ± Slope = 147.83 0.01 ( combined ) ± Slope = 145.28

results of prototype

saturation effect of MPPC is corrected for each strip

scintillator strip ECAL

TT CLIC-WS 09 @ CERN

)

1/2

/c

1/2

( GeV

beam

P 1/

0.5 1

/ E (%)

E

!

2 4 6 8 10 12 14 16 18 20

0.05 !

stat. = 15.67

0.04 ( uniform ) !

const. = 1.21

0.04 !

stat. = 14.80

0.03 ( center ) !

const. = 1.59

0.03 !

stat. = 15.15

0.02 ( combined ) !

const. = 1.44

 linearity and resolution

CALICE preliminary

SLIDE 12

r0 reconstruction

 target in pion beam to make r0  find two isolated clusters  calculate its mass  with different Er

π０ peak

Calice Preliminary

TT CLIC-WS 09 @ CERN

SLIDE 13

in situ calibration

 use hadron tracks

in ECAL

 simulation study  100 hits / strip  100 pb-1 at Z pole

ECAL HCAL dE/dx /strip no selection

TT CLIC-WS 09 @ CERN

SLIDE 14

in situ calibration

 use hadron tracks

in ECAL

 simulation study  100 hits / strip  100 pb-1 at Z pole

ECAL HCAL dE/dx /strip no selection

TT CLIC-WS 09 @ CERN

SLIDE 15

monitoring system

ADC

 MPPC has auto-gain calibration capability  to monitor 1 p.e. w/o LED  LED though clear fiber with notches

ADC LED 1p.e. TT CLIC-WS 09 @ CERN

SLIDE 16

non-uniformity effect

 non uniformity of scintillator causes

constant term in energy resolution

0.05 0.1 0.15 0.2 0.2 0.4 0.6 0.8 1 1.2

scintillator non-uniformity-simulation resolution 1/sqrt(E)

0.5@5cm extruded (data) uniform sim.

non uniformity 0.7 @5cm

5cm

0.2 0.4 0.6 0.8 1 1 2 3 4 5 B A

0.5 0.7 data 1.0=uniform non-uniformity assumed e-ax

x(cm)

measured 0.5

TT CLIC-WS 09 @ CERN

SLIDE 17

Further segmentation ECAL

5mm width is favored by current PFA study
WLSF-less configuration
which looks promising

distance from MPPC (mm)

5 10 15 20 25 30 35 40 45

the number of p.e.

2 4 6 8 10 12 14

0.0 mm from center 1.5 mm from center

5mm wide strip bench test

M. Thomson

good uniformity jet energy resolution no precise alignment required severer on CLIC TT CLIC-WS 09 @ CERN

SLIDE 18

 CALICE AHCAL  scintillator tiles  3cm x 3cm x 0.5cm  with SiPM

scintillator HCAL

TT CLIC-WS 09 @ CERN

SLIDE 19

 CALICE AHCAL  scintillator tiles  3cm x 3cm x 0.5cm  with SiPM

scintillator HCAL

TT CLIC-WS 09 @ CERN

SLIDE 20

results of AHCAL

pion energy measurement

TT CLIC-WS 09 @ CERN

SLIDE 21

results of AHCAL cont.

energy resolution (AHCAL+TMC) sum of E-density 49%/sqrt(E)

no density correction

E-density weight

TT CLIC-WS 09 @ CERN

SLIDE 22

next gen. prototype

 combined electronics

in a layer

 new SPIROC  power pulsing

timing on CLIC TT CLIC-WS 09 @ CERN

SLIDE 23

next gen. scintillator

 tile  with WLSF  w/o WLSF

with dimple

 strip  without WLSF

severer on CLIC TT CLIC-WS 09 @ CERN μ

Distance btw MPPC and fiber(mm) 0.2 0.4 0.6 0.8 1 1.2 The numbe of p.e. 5 10 15 20 25 30 35 40 Distance from center of fiber( m) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 The number of p.e. 5 10 15 20 25 30 35 40

m

SLIDE 24

 problem with neutrons

.1 1 1 1 1 2 4 6 8 1

pi- 4GeV 緑ニュートロンのヒット Z シンチでトラックから離れたヒットはニュートロン散乱に起因する。 Pb/Sci

0.1 1 10 100 1000 10

4

20 40 60 80 100 a pion interaction in HCAL layers time (ns) Z layer charged neutron

50 100 150 200 1 10 100 1000 time-cut for pi-4GeV E(scinti) (MeV) time cut (ns) no cut total energy measured (MeV) total hits Pb8+sci2mm

20% LHEP

scintillator HCAL

without Birk’s low TT CLIC-WS 09 @ CERN

SLIDE 25

summary & for CLIC

 investigating scintillator calorimeters  with PFA idea (segmentation) for LC  current R/O with WLSF for ECAL&HCAL  basic performances look good enough  both linearity and resolution  combined layer (electronics +active)  higher E collisions require finer segmentation  neutron contribution should be in mind

severer on CLIC but time resolution will help TT CLIC-WS 09 @ CERN with time stamping capability 4D detector

SLIDE 26

ECAL for ILC

20 cm

Tungsten Alveolus Carbone Fiber Detector slab

Tungsten : small Moliere radius ~1cm
need less gap between layers
read out elex. within layers
Amp, Shaper +15 bit ADC
power pulsing : 1/1000 ~nW/ch
sensor :
Scintillator strip

TT CLIC-WS 09 @ CERN

SLIDE 27

MPPC saturation

 saturation curve measured  by UV laser with scintillator + WLSF  a MPPC & a PMT

PMT out = p1Ntrue MPPC out = Nfired

N fired = N p0(1− exp(−p1Ntrue N p0 ))

Np0=2424 TT CLIC-WS 09 @ CERN

SLIDE 28

PFA W/Z separation

TT CLIC-WS 09 @ CERN

M. Thomson

SLIDE 29

ECAL discussion

Dynamic range : electronics & Photon sensor

dE / cell (MIP) at least 15bits ADC e+e- > e+e- at 500GeV

JCBrient

MPPC non linearity

8 ns 16 ns 24 ns w = 50 ns 1600

PMT

LED w

MPPC

1600 pix Results

TT CLIC-WS 09 @ CERN