1. Shashlik type calorimeter for SHIP experiment
Vladimir Poliakov
Institute for High Energy Physics, Protvino, Russia
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

2. 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

3. The COMPASS experiment Common Muon Proton Apparatus for Structure and Spectroscopy
Muon beam:
data taking ,
Intensity 2x108 spill
Hadron beam:
data taking , 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

4. 350 days running, hadron beam 190 GeV, 5.0107/spill
Rad
400rad
2 krad
4000
Need 900 additional rad hard blocks
400 40
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

5. 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

6. V.Poliakov, Shashlik calorimeter
ZEUS Shashlik EM-calorimeter;
NIM A: 450 (2000) no. 2-3, pp
~25%
~15%
e±, p,n
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

7. Spiral Shashlik module
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

8. Spiral Shashlik module
Dimensions x38.2 mm2
Radiation length 17.5mm
Moliere radius 36mm
Radiation thickness 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

9. 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

10. 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

11. 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

12. Uniformity, 4GeV electrons
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

13. Uniformity, 70GeV electrons
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

14. 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

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

16. Profile for 10 GeV photons
RM = 36 mm
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

17. 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

18. IHEP Scintillator Facilities
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

19. V.Poliakov, Shashlik calorimeter
Mould
Scintillators
600 plates per shift
SHIP workshop, 11 June 2014
V.Poliakov, Shashlik calorimeter

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

21. Proposal Shashlik type calorimeter
Dimensions 500x500 cm2
Granularity
Center 200x200 cm cells (3.83x3.83 cm2)
Periphery cells (7.66x7.66 cm2)
Radiation length 17.5mm
Moliere radius 36mm
Radiation thickness 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

22. 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