Shashlik type calorimeter for SHIP experiment Vladimir Poliakov Institute for High Energy Physics, Protvino, Russia SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter 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 Proposal for SHIP experiment SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
The COMPASS experiment Common Muon Proton Apparatus for Structure and Spectroscopy Muon beam: data taking 2002-2007, 2010-2011 Intensity 2x108 spill Hadron beam: data taking 2008-2009, 2012 Intensity 5x107 spill 2nd spectrometer Second electromagnetic calorimeter (GAMS-4000 detector, since 1980 at CERN, NA12 and WA102) dimension: 2.6 x 2.0 m2,; 3068 channels; Spiral Shashlik and lead glass blocks, 38x38 mm2; SM2 magnet 1st spectrometer ECAL2 SM1 magnet 50 m First electromagnetic calorimeter dimension: 4.0 x 2.9 m2,; 1708 channels, spiral Shashlik and lead glass blocks 38x38 mm2, lead glass blocks 75x75 mm2, 142x142 mm2; central hole 0.76x0.46 m2; angular acceptance 180x130 mrad ECAL1 SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
350 days running, hadron beam 190 GeV, 5.0107/spill Rad 400rad 2 krad 4000 Need 900 additional rad hard blocks 400 40 SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
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 doses; Shashlik calorimeter – bad energy resolution and uniformity for small angles (up to 50mrad) SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter ZEUS Shashlik EM-calorimeter; NIM A: 450 (2000) no. 2-3, pp.235-252. ~25% ~15% e±, p,n SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Spiral Shashlik module SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
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% PMT read out FEU-84 Electronics 12 bit sampling ADC, design TUM Munich SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter Spiral Shashlik Sampling – 0.8 mm lead and 1.5 mm scintillator; 4x4 fibers, 4 steel rods; 160 layers 4 types of scintillators and lead plates 2mm 22.50 1.4mm 1mm SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Energy resolution (T9 and H4 beam tests) σE/E = a/√E b σE/E = a/√E b c/E SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Energy resolution (T9 and H4 beam tests) 120 GeV σE/E = 1.14% 2 GeV σE/E = 4.23% SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Uniformity, 4GeV electrons SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Uniformity, 70GeV electrons SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
CFD time resolution st ≈ 0.9 ns Real data 3068 channels Amplitude cut: 20 ADC channels ≈ 600 MeV 18 March 2010 COMPASS collaboration meeting, Venice
V.Poliakov, Shashlik calorimeter SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Profile for 10 GeV photons RM = 36 mm SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter Mass production IHEP facilities - the production of molded scintillators by the injection molded technique. 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 – 300 modules per month (1 shift per day, 1 machine) SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
IHEP Scintillator Facilities www.ihep.ru/scint/index-e.htm SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter Mould Scintillators 600 plates per shift SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
V.Poliakov, Shashlik calorimeter SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Proposal Shashlik type calorimeter Dimensions 500x500 cm2 Granularity Center 200x200 cm2 2720 cells (3.83x3.83 cm2) Periphery 3570 cells (7.66x7.66 cm2) 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% Read out PMT or SiPM SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter
Signal Time extraction Input signal Input signal x 2 Difference B[i] B[i] = A[i] – 2 A[i+N] B[i+1] Signal detection conditions: B[i] > 0 B[i+1]≤ 0 B[i]-B[i+1] > 20 ADC channels (600 MeV) Fine Time calculation 18 March 2010 COMPASS collaboration meeting, Venice Igor Konorov