DESY Beam Test of a EM Calorimeter Prototype with Extruded Strip Scintillator DongHee Kim Kyungpook National University Daegu, South Korea.

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Presentation transcript:

DESY Beam Test of a EM Calorimeter Prototype with Extruded Strip Scintillator DongHee Kim Kyungpook National University Daegu, South Korea

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, Extruded Scintillator R & D 2. Beam Test 3. Preliminary Results 4. Summary and plan Contents

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007  Probably the most commonly used organic scintillator in nuclear & high energy physics so far  The plate used to be cut, polished, light reflector added etc..as wished.  Recent demand of calorimetry tend to be with a fine cell (size of 1 ~ 4 cm 2 )  Cast scintillator requires lots of procedures for final module and cost more ex) $40/kg-$60/kg (2000) $80/kg (2004) $100/kg (2005) $200/kg (2006)  Machining of the raw sheets (+ $200/kg) → significantly add to the final detector cost & time (+ $?00/kg) CAST Plastic Scintillator We may need a low cost method to produce scintillator  Extrusion Technique

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Produced at MiSung Chem. co. In Korea Extruded Scintillator Light Reflector comes simultaneously reduce lots of procedures rather cheap As long as a fine cell scheme is concerned  Extrusion technique may be more reliable

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 History  R&D of dopants (primary & secondary)  R&D of groove (length, depth & shape)  R&D of Light yield  Design optimization (length, width, Thickness) 2006  R & D of ECAL strip scintillator  Production of strips for ECAL prototype 2007  DESY Test beam studies of the ECAL test module

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007  Start with MINOS strip(bar) produced (4cm(width)X1cm(thickness)  The mechanical process has been established  Light yield comparable with MINOS reference bar  proper ratio of polystyrene:PPO:POPOP  After making sure, R & D to produce fine strip scintillator for Tile/W calorimeter, Early R & D TIME

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Extruded fine scintillator strips 1cm(width)x3mm(thickness) with hole for fiber embedding with extrusion method 3mm 10mm Hole for fiber

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 scintillators Kuraray plastic scintillator SCS : Mega strip Kyungpook N. U : extruded scinti. made from a plate grooves for WLSF and strip isolation a hole outer shield by TiO2

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, cm 5cm 10cm 15cm 20cm 25cm 30cm 35cm 40cm nA Sample size : 10mm x 500mm x 3mm The number of samples : 30 strips Light Yield along position for each strips

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Light Yield Uniformity for all strips σ = 0.05

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Light Yield Comparison photons photons Kuraray sample with 3M reflector KNU sample with TiO 2 ~85%

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Assembly of a layer

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Fabrication of Module

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Fabrication with FPCB

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, Types of Modules tested 1. Mega-strips, WLSF readout, 13 layers 2. Mega-strips, Direct readout, 13 layers 3. Extruded strips covered by TiO 2, WLSF readout, 13 layers (KNU) Beam FR layers Examined 3 different combinations of the modules.

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Prototype Module B

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Position scans at 1,2,3,4,5,6 GeV

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Shower profile at 1 & 6 GeV 1 GeV6 GeV

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Shower profile in depth

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Beam Energy Profile

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Preliminary results Energy Resolution of extrudedStripmodule RMS/Mean 1/ √E RMS/Mean 1/ √E 13.1% Raw data After applying correction coefficients 14.5% However, the constant term is 4% !

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Energy Resolution comparison Energy resolution Linear(%)Constant(%) 1Japan strips w/ fiber Japan strips w/o fiber Korea strips w/ fiber In overall, good results : expected good results under given material configuration Configuration 1,2 & 3 : comparable linear term but 1 is a bit bad Config 2 & 3 : rather high constant term Configuration 2 : this option may be discarded since the constant term is not controllable. Configuration 3 : the constant term can be controlled. However it is preliminary and need more analysis and inspections.

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Response along the strip Kuraray strip w/ fiberKNU strip w/ fiberKuraray strip w/o fiber

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Ende Hole size comparison (from different batch)

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Matching problem of MPPC & fiber

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Constant term High constant term causes problems in very high energy. It usually happens when the light is not uniform in strip by strip. After investigations, two very plausible problems found.  Fiber loose in hole  cause light loss  Light reflector in far side edge from MPPC ripped off

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Lesson from the Beam Test Based on preliminary results Too high cost with cast scintillator  More plausible with extruded strips (?) However, extruded strips need more R&D  Fiber sitting problem, reflector on edge etc..  these might be resolved.

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 R & D List for the future Embedded WLS fiber to the strips  to minimize mismatch between WLS fiber and MPPC active area  Temperature concerned  need investigations  consider this option  die under making If succeed, WLS fiber will be produced as well MEGA tile concept Quality Control scheme on production. Try next beam test at FNAL after resolving

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Summary First results show would-be-promise with extruded scintillator Of course, More R & D required See what happen Next Test Beam at FNAL

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Summary and plan First results show would-be-promise with extruded scintillator Of course, More R & D required See what happen at the next Beam Test

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Backup

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Tungsten plate Taegu Tech in Korea Super strong Tungsten W(88%)+Co(12%)+C(0.5%) Absorber TT - ECFA-Valencia Nov cm x 10cm x 3.5mm 128plates thickness = ±0.017 mm density =14.5 g/cm 3 Moliere R =10.1 mm

DongHee Kim Kyungpook National University Calice Collaboration meeting Kobe U. May 10-12, 2007 Measurement of absolute Light Yield = ~ 30 photons # of photon from fiber = Pulse height (ADC counts) pedestal signal – = counts # of p.e. : 3.84 = / 13.2 # of photons from fiber : 3.84 / 0.13 = Sample : KNU tile 10mm x 50mm x 3mm 13.2 (ADC count / 1pe) * Q.E. From 9 th ACFA by Chang

Position Scan Scan with 90 Sr along 1 m Strip bar Attenuation Length