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Scintillator ECAL for ILC for Calorimeter Review DESY May2007 Tohru Takeshita (CALICE-Shinshu) Idea...
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Transcript of Scintillator ECAL for ILC for Calorimeter Review DESY May2007 Tohru Takeshita (CALICE-Shinshu) Idea...
Scintillator ECALfor ILC
for Calorimeter ReviewDESY May2007
Tohru Takeshita (CALICE-Shinshu)
Ideaimplementationcurrent status
future mile stones
ECAL in ILC•Electro-Magnetic Calorimeter ECAL
•Role : to identify photons and pi0
•fine segmentation
•lateral and longitudinal directions
HCAL
ECAL
1cm seg.hit info. only
Tracker
T.Takeshita cal-review@DESY May07
identify pi-zero•two photon reconstruction
4GeV
1020
50GeV
distance between two photons
ECAL 210cm from IP20GeV
pi0
pictorial ECAL
1cm seg.
depth
T.Takeshita cal-review@DESY May07
Scintillator strip ECAL•to reduce the number of readout
channels•orthogonal strips•effective 1cm x 1cm areaEM-Scintillator-layer model TT 1May07Cross section R/O chipMPPCX-LayerZ-LayerTungsten3mm2mm1mm3mmMPPCWLSFscintillatorPCBTungstenTungstenparticle2mm1mm1cm4cm
CALICE ECAL-Scintillator-layer model TT 1/May/07
particlesX-LayerZ-Layer1cmx4cmx2mm1cmx4cmx2mmMPPC R/O with WLSFMPC R/O with WLSFabsorber plate
T.Takeshita cal-review@DESY May07
strip experience (det.)•20 cm long scintillator strips with
Wave Length Shifting Fire read out (MAPMT)
20cmx1cmx2mm 24layersWLSF
T.Takeshita cal-review@DESY May07
strip experience (res.)•pictorial calorimeter
L1
L2
L3
L4
L5
L6
angle resolution
strip # T.Takeshita cal-review@DESY May07
short strip ECAL for ILC•to have less overlap of showers and
charged particles in Jet environment
•for each layer, direction of strip aligned 90%
•effective 1cm x 1cm resolution
•MPPC read out : direct attached
•semi-conductor photo-sensor
•1mmx1mm 1600 pixels
•Tungsten absorber :
•to reduce Mollier R.
5cm long
3mm
4mmT.Takeshita cal-review@DESY May07
MPPC •Geiger Mode pixel Photon sensor
•independent development by us and Hamamatsu Photonics Inc. from SiPM
•100, 400 and 1600 pixels in 1mm x 1mm
polysilicon registernÅ{pp+guard ringìdèÍ610
~μm1mm1mm
T.Takeshita cal-review@DESY May07
MPPC development•joint work going on with Hamamatsu
2005冬
Dec-2005
Laser test
1600pix
25nm
Jan-2007
T.Takeshita cal-review@DESY May07
MPPC cont.•digital response of each pixel
0p.e.
1p.e.
2p.e.3p.e.
Vbias (V)
Gain (10 )5
V : breakdown voltage0
C : capacitance of a pixel
1600pix
T.Takeshita cal-review@DESY May07
MPPC cont.
Over voltage (Vbias- V0)
gain (10 )5 Dec/06
Feb/07
800 pieces of MPPC tested
1600pix
Dec/06Noise Rate (kHz)
300kHz
Vober
>0.5p.e.
T.Takeshita cal-review@DESY May07
MPPC cont.: cross talk
Feb/07with FPCB
Over voltage (=Vbias-Vo)
an avalanche photon reaches neighboring pixel
Dec/06
T.Takeshita cal-review@DESY May07
MPPC cont. : pix uniformity•laser shot at the center of each pixel
3.2(x105)
3.8 (x105)
3.2(x105)
3.2(x105)
3.2(x105)
3.8 (x105)3.8 (x105)
3.8 (x105)
20 x 20 pixels
Sensor
T.Takeshita cal-review@DESY May07
1600
MPPC current dev.
T.Takeshita cal-review@DESY May07
#of pix Δt
Δt(ns)
Laser
•Linearity is a key for the calorimeter
•MPPC has principle limit of linearity by number of pixels
•significant linear behavior measured
•due to fast recovery timeテキスト
LED
scintillator strip•two mega-strip and extruded strip
•with and without Wave Length Shifting Fibre
9cm9cm
Cast-Mega-strip
Extruded-striphole with
TiO2 outer shield
T.Takeshita cal-review@DESY May07
Fabrication of ECALMPPCscintillator
T.Takeshita cal-review@DESY May07
prototype ECAL at DESY
dev. for CLAICE AHCAL
DAQ
SiPM
GLIDVO
CALICE
March/07
468 MPPCs
T.Takeshita cal-review@DESY May07
DESY BT onlinewithout Tungsten
plates3GeV e 6GeV e
with Tungsten plates
T.Takeshita cal-review@DESY May07
DESY BT calibrationextracting Tungsten plate MIP=3GeV electron
ped. ped.
last layerfirst layer
Black … trigger/veto cutsRed … Yellow strips have non-pedestal signalBlue … Green strips have no signal
MIP MIP
T.Takeshita cal-review@DESY May07
SC-ECAL DESY results
(preliminary)linearity 1-6GeV
1 2 3 4 5 6 GeV
energy measurement with WLSF
T.Takeshita cal-review@DESY May07
linear than expected
SC-ECAL DESY results
(preliminary)longitudinal shower profile
electron resolution (1-6GeV)
config.edge
with WLSF
T.Takeshita cal-review@DESY May07
Mile stones•const. 4 times bigger Scintillator ECAL
•MPPC dev. and 2.5k prod.
•extrusion scintillator prod.
•embedded WLS fiber to strip
•Mega-extrusion
•electronics
•2008 Beam test at Fermilab w HCAL
•to test pi0 reconstruction : r+n>r0+p
r+p
2photons
desy data analysis
T.Takeshita cal-review@DESY May07
summary & outlook•scintillator ECAL in CALICE project
•with strip structure
•very much hardware progress : DESY-BT
•MPPC : photo-sensor
•scintillator
•simulation work to identify pi0
•2008 TB at Fermilab
•engineering workT.Takeshita cal-review@DESY May07