Scintillator ECAL for ILC for Calorimeter Review DESY May2007 Tohru Takeshita (CALICE-Shinshu) Idea implementation current status future mile stones.

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Presentation transcript:

Scintillator ECAL for ILC for Calorimeter Review DESY May2007 Tohru Takeshita (CALICE-Shinshu) Idea implementation current 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 May07

identify pi-zero two photon reconstruction 4GeV GeV distance between two photons ECAL 210cm from IP20GeV pi0 pictorial ECAL 1cm seg. depth T.Takeshita May07

Scintillator strip ECAL to reduce the number of readout channels orthogonal strips effective 1cm x 1cm area T.Takeshita May07

strip experience (det.) 20 cm long scintillator strips with Wave Length Shifting Fire read out (MAPMT) 20cmx1cmx2mm24layers WLSF T.Takeshita May07

strip experience (res.) pictorial calorimeter L1 L2 L3 L4 L5 L6 angle resolution strip # T.Takeshita 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 4mm T.Takeshita 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 T.Takeshita May07

MPPC development joint work going on with Hamamatsu 2005 冬 Dec-2005 Laser test 1600pix 25nm Jan-2007 T.Takeshita May07

MPPC cont. digital response of each pixel 0p.e. 1p.e. 2p.e. 3p.e. Vbias (V) Gain (10 ) 5 V : breakdown voltage 0 C : capacitance of a pixel 1600pix T.Takeshita May07

MPPC cont. Over voltage (Vbias- V 0 ) gain (10 ) 5 Dec/06 Feb/ pieces of MPPC tested 1600pix Dec/06 Noise Rate (kHz) 300kHz Vober >0.5p.e. T.Takeshita May07

MPPC cont.: cross talk Feb/07 with FPCB Over voltage (=Vbias-Vo) an avalanche photon reaches neighboring pixel Dec/06 T.Takeshita May07

MPPC cont. : pix uniformity laser shot at the center of each pixel 3.2(x10 5 ) 3.8 (x10 5 ) 3.2(x10 5 ) 3.8 (x10 5 ) 20 x 20 pixels Sensor T.Takeshita May07

1600 MPPC current dev. T.Takeshita May07 #of pix ΔtΔt Δ  t(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 Cast-Mega-strip Extruded-strip hole with TiO2 outer shield T.Takeshita May07

Fabrication of ECAL MPPCscintillator T.Takeshita May07

prototype ECAL at DESY dev. for CLAICE AHCAL DAQ SiPM GLID VO CALICE March/ MPPCs T.Takeshita May07

DESY BT online without Tungsten plates 3GeV e6GeV e with Tungsten plates T.Takeshita May07

DESY BT calibration extracting Tungsten plate MIP=3GeV electron ped. last layerfirst layer Black … trigger/veto cuts Red … Yellow strips have non-pedestal signal Blue … Green strips have no signal MIP T.Takeshita May07

SC-ECAL DESY results (preliminary) linearity 1-6GeV GeV energy measurement with WLSF T.Takeshita May07 linear than expected

SC-ECAL DESY results (preliminary) longitudinal shower profile electron resolution (1-6GeV) config.edge with WLSF T.Takeshita 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+r+ p 2photons desy data analysis T.Takeshita 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 pi TB at Fermilab engineering work T.Takeshita May07