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Radiation hard Shashlik calorimeter for COMPASS experiment

Radiation hard Shashlik calorimeter for COMPASS experiment. Vladimir Polyakov Institute for High Energy Physics, Protvino. Outline. The COMPASS experiment Requirement and motivation Design of spiral Shashlik module MC and beam test results of the Shashlik prototype

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Radiation hard Shashlik calorimeter for COMPASS experiment

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  1. Radiation hard Shashlik calorimeter for COMPASS experiment Vladimir Polyakov Institute for High Energy Physics, Protvino V.Polyakov, Shashlik calorimeter

  2. Outline The COMPASS experiment Requirement and motivation Design of spiral Shashlik module MC and beam test results of the Shashlik prototype Mass production of Shashlik modules Conclusion V.Polyakov, Shashlik calorimeter

  3. The COMPASS experimentCommon Muon Proton Apparatus for Structure and Spectroscopy Muon beam: data taking 2002-2007 Intensity 2x108 spill-1 Hadron beam: data taking 2008-2009 Intensity 5x107 spill-1 2nd spectrometer SM2 magnet • Second electromagnetic calorimeter • (GAMS-4000 detector, since 1980 at CERN, NA12 and WA102) • dimension: 2.6 x 2.0 m2,; 3000 channels; • Spiral Shashlik and lead glass blocks, 38x38 mm2; 1st spectrometer ECAL2 50 m SM1 magnet • First electromagnetic calorimeter • dimension: 4.0 x 2.9 m2,; 1500 channels, • three types of lead glass blocks 38x38 mm2, 75x75 mm2, 142x142 mm2; • central hole 1.1x0.6 m2; • angular acceptance 180x130 mrad ECAL1 V.Polyakov, Shashlik calorimeter

  4. ECAL2 before 2008 Total number of channels – 3068, 38.2x38.2mm lead glass blocks ~800 radhard blocks Radiation thickness – ~16 X0 Radiation hardness – 400 rad for lead glass blocks 3 krad for radhard lead glass blocks Energy resolution – 6%/√(E) 2% for lead glass blocks 6%/√(E) 4% for radhard lead glass blocks Minimal angle – 0mrad Maximal angle – 40mrad (horiz.) and 30mrad ( vert.) Limitation for ECAL2: • Radiation dose • 350 days running, 190 GeV hadrons, 5x107/spill, maximal dose – 40 krad V.Polyakov, Shashlik calorimeter

  5. 350 days running, hadron beam 190 GeV, 5.0107/spill Rad 400rad 2 krad 4000 Need additional 900 rad hard blocks 400 40 V.Polyakov, Shashlik calorimeter

  6. COMPASS requirements for radhard calorimeter: • Radiation hardness  500 krad • Energy range  1÷190 GeV • Energy resolution  • Radiation thickness  23 X0 • Uniformity  1÷2% for angular range 0-40mrad • Module size  38.2x38.2 mm2 • Module length  450 mm • PWO crystals – very high price, radiation instability for low dose; • Shashlik calorimeter – bad energy resolution and uniformity for small angles (up to 50mrad) V.Polyakov, Shashlik calorimeter

  7. ZEUS Shashlik EM-calorimeter; NIM A: 450 (2000) no. 2-3, pp.235-252. ~25% ~15% e±, p,n V.Polyakov, Shashlik calorimeter

  8. Spiral Shashlik module • Dimensions 38.2x38.2 mm2 • Radiation length 17.5mm • Moliere radius 36mm • Radiation thickness 22.5 X0 • Scintillator thickness 1.5mm • Lead thickness 0.8mm • Radiation hardness 0.5 Mrad • Energy resolution 6.5%/√E 1% V.Polyakov, Shashlik calorimeter

  9. Spiral Shashlik • Sampling – 0.8 mm lead and 1.5 mm scintillator; 4x4 fibers, 4 steel rods; 155 layers • 4 types of scintillators and 2 types of lead plates 2mm 22.50 1.4mm 1mm V.Polyakov, Shashlik beam tests

  10. ECAL2, Run 2003  1000 blocks remove 780 radiation hard blocks install ECAL2, Run 2008, 6448 GAMS lead glass blocks, 22 blocks central hole GAMS blocks 864 Shashlik modules 1440 GAMS blocks 768 radhard GAMS blocks GAMS blocks V.Polyakov, Shashlik calorimeter

  11. ECAL2, Run 2003  1000 blocks remove 780 radiation hard blocks install 3 types of modules that are used in ECAL2 calorimeter Shashlik modules GAMS lead glass blocks radhard GAMS lead glass blocks V.Polyakov, Shashlik calorimeter

  12. Energy resolution (T9 and H4 beam tests) σE/E = a/√E b σE/E = a/√E b c/E V.Polyakov, Shashlik calorimeter

  13. Uniformity, 4GeV electrons V.Polyakov, Shashlik calorimeter

  14. Uniformity, 70GeV electrons V.Polyakov, Shashlik calorimeter

  15. Profile for 10 GeV photons RM = 36 mm V.Polyakov, Shashlik calorimeter

  16. ∏0 from real data; Shashlik shows 30% better resolution compared to lead glass VP, Shashlik

  17. Mass production • Radiation hardness of scintillators was measured up to 250 krad • Loading test • No changes in light yield and attenuation after 4 month of loading with 120 kg • Online control: • The spread of light yield for scintillators is less than 3% • The spread of the thickness of lead is less than 80μk ( 10%) • Measurements of light yield and attenuation length for each spiral Shashlik modules • Attenuation length > 1.7m • Light yield > 400 photoelectrons per MIP • Production speed – 200 modules per month V.Polyakov, Shashlik calorimeter

  18. IHEP Scintillator Fasilities www.ihep.ru/scint/index-e.htm V.Polyakov, Shashlik calorimeter

  19. Mould Scintillators V.Polyakov, Shashlik calorimeter

  20. Scintillators V.Polyakov, Shashlik calorimeter

  21. V.Polyakov, Shashlik calorimeter

  22. Conclusion • The new type of the Shashlik calorimeter were design and developed; • 900 spiral Shashlik modules for upgrade of second electromagnetic calorimeter of COMPASS experiment are produced; • Spiral Shashlik calorimeter is adequate the requirements of COMPASS; V.Polyakov, Shashlik calorimeter

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