SHIP workshop, 11 June 2014V.Poliakov, Shashlik calorimeter1 Shashlik type calorimeter for SHIP experiment Vladimir Poliakov Institute for High Energy

SHIP workshop, 11 June 2014 V.Poliakov, Shashlik calorimeter

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Shashlik type calorimeter for SHIP experiment

Vladimir Poliakov Institute for High Energy Physics, Protvino,

Russia


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Outline

1. The COMPASS experiment

2. Requirement and motivation

3. Design of spiral Shashlik module

4. MC and beam test results of the

Shashlik prototype

5. Mass production of Shashlik

modules

6. Proposal for SHIP experiment


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The COMPASS experimentCommon Muon Proton Apparatus for Structure and

Spectroscopy

2nd spectrometer

1st spectrometer

SM1 magnet

SM2 magnet

50 m

ECAL1

ECAL2

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

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;

Muon beam: data taking 2002-2007, 2010-2011 Intensity 2x108 spill

Hadron beam: data taking 2008-2009, 2012 Intensity 5x107 spill


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350 days running, hadron beam 190 GeV, 5.0107/spill

Rad

4000

400

40

Need 900 additional rad hard blocks

2 krad

400rad


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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

COMPASS requirements for radhard calorimeter:

%5.0E

%5.5

1. PWO crystals – very high price, radiation instability for low doses;

2. Shashlik calorimeter – bad energy resolution and uniformity for small angles (up to 50mrad)


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ZEUS Shashlik EM-calorimeter;NIM A: 450 (2000) no. 2-3, pp.235-252.

~25% ~15%

e±, p,n


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Spiral Shashlik module


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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


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Spiral Shashlik

1mm

1.4mm

2mm

22.50

Sampling – 0.8 mm lead and 1.5 mm scintillator; 4x4 fibers, 4 steel rods; 160 layers

4 types of scintillators and lead plates


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Energy resolution (T9 and H4 beam tests)

σE/E = a/√E b c/E

σE/E = a/√E b


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Energy resolution (T9 and H4 beam tests)

120 GeVσE/E = 1.14%

2 GeVσE/E = 4.23%


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Uniformity, 4GeV electrons


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Uniformity, 70GeV electrons

18 March 2010 COMPASS collaboration meeting, Venice

st ≈ 0.9 ns

Amplitude cut: 20 ADC channels ≈ 600 MeV

• Real data• 3068 channels

I.Konorov 14

CFD time resolution


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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)


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IHEP Scintillator Facilitieswww.ihep.ru/scint/index-e.htm


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Mould

Scintillators

600 plates per shift


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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

Documents

SHIP workshop, 11 June 2014V.Poliakov, Shashlik calorimeter1 Shashlik type calorimeter for SHIP experiment Vladimir Poliakov Institute for High Energy