1. On behalf of CEPC calorimeter working group
2018/12/26
CEPC ECAL R&D Status
Yunlong Zhang
On behalf of CEPC calorimeter working group
State Key Laboratory of Particle Detection and Electronics, China
University of Science and Technology of China

2. International Workshop on the CEPC 2017
2018/12/26
Outline
Motivation
CEPC ECAL
Sensitive Detector
Readout Electronics
Test Results
Cosmic rays test
Beam test
Summary
International Workshop on the CEPC 2017
2018/12/26

3. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Motivation
Circular Electron Positron Collider (CEPC)
Ecm240GeV, luminosity ~21034 cm-2s-1 can also rum at the Z-pole
Precision measurement of the Higgs boson (and the Z boson)
e+e-  ZH
International Workshop on the CEPC 2017
2018/12/26

4. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Requirements of CEPC EMCal
ILD-like detector with additional considerations.
The Particle Flow Algorithm (PFA) calorimeter concept was proposed
High granularity
Good shower separation
Good energy resolution
International Workshop on the CEPC 2017
2018/12/26

5. International Workshop on the CEPC 2017
2018/12/26
Outline
Motivation
CEPC ECAL
Sensitive Detector
Electronics
Test Results
Cosmic rays test
Beam test
Summary
International Workshop on the CEPC 2017
2018/12/26

6. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
PFA Calorimeter
International Workshop on the CEPC 2017
2018/12/26

7. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
CEPC ECAL
Sampling Calorimeter
Sandwich structure
Absorber+SD+Electronics
Absorber
Tungsten
Sensitive Detector
Scintillator+SiPM
Readout Electronics
SPIROC Chip
International Workshop on the CEPC 2017
2018/12/26

8. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
ECAL Optimization I
Total thickness: 24 X0
Sampling number: 30 layers
Granularity: <10mm*10mm
International Workshop on the CEPC 2017
2018/12/26

9. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
ECAL Optimization II
Dynamic range of ECAL SD
1MIP – 800 MIPs
~10 1 MIP
SiPM ~10k pixels
Gain of SiPM:~105
SPIROC:160fC – 100 pC
240 MeV (800MIPs)
100GeV γ
Max edep in SD
Shower profile in ECAL
International Workshop on the CEPC 2017
2018/12/26

10. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Elements of ECAL
Scintillator （5mm*45mm*2mm）
SiPM（1mm＊1mm10000 pixels）
Dynamic range：~100fC~200pC
channels：36
Dead time：2ms
Polar: positive
power：8mW/channel
International Workshop on the CEPC 2017
2018/12/26

11. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
SiPM Test
LED test system
LED test system was built to test the SiPM dynamic range
Pixel:25um
Pixel:10um
International Workshop on the CEPC 2017
2018/12/26

12. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
SiPM Test
The width of LED light are:12ns,20ns and 30ns
International Workshop on the CEPC 2017
2018/12/26

13. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Scintillator Test
Plastic scintillator
Size: 2mm*5mm*45mm
“high energy” β-rays as MIPs to test SD
pedestal
90Sr Spectrum
Typical Beta energy distribution
International Workshop on the CEPC 2017
2018/12/26

14. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Scintillator Test
Plastic scintillator
Several different package methods
Light yield uniformity: 9%
β-rays
The light yield uniformity
International Workshop on the CEPC 2017
2018/12/26

15. International Workshop on the CEPC 2017
2018/12/26
Readout Electronics
SiPM front-end with ASIC SPIROC2b of 36 channels
FPGA (Artix-7 200T)
DIF is compatible for further FEB
USB for data upload & cmd sending
USB for single DIF, and serial port for DAQ when using multiple DIF
Switched capacitor array store charge measurement
12 bits ADC conversion
Variable Gain due to:
adjustable Cf of pre-amplifer
Rload on the board
Shaping time and delay
International Workshop on the CEPC 2017
2018/12/26

16. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Readout Electronics
Test platform
Signal generator for electronic testing
Sci + SiPM detector with cosmic triggers
Power supply, oscilloscope and PC
FEB
DIF
Test Platform
International Workshop on the CEPC 2017
2018/12/26

17. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Readout Electronics
Sigma=5.6
The details could be seen in Shensen’ Poster
International Workshop on the CEPC 2017
2018/12/26

18. International Workshop on the CEPC 2017
2018/12/26
Outline
Motivation
CEPC ECAL
Sensitive Detector
Electronics
Test Results
Cosmic rays test
Beam test
Summary
International Workshop on the CEPC 2017
2018/12/26

19. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Cosmic Ray Test
Three different scintillator materials were tested by cosmic rays
Plastic scintillator
BC408
EJ200
Crystal
BGO crystal
SiPM
S P
1mm*1mm
10k pixels
The details could be seen in Yazhou’ Poster
International Workshop on the CEPC 2017
2018/12/26

20. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Test Results
EJ200
BC408
BGO
Amp:134
Amp:140
Amp:110
International Workshop on the CEPC 2017
2018/12/26

21. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Test Results
Compared with CALICE-EBU ECAL
Our Result
CALICE-EBU ECAL Results
International Workshop on the CEPC 2017
2018/12/26

22. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Beam Test
Driver circuit: C
S P (Hamamatsu),
BC408 with dimension of 45mm×5mm×2mm
Schematic of readout
Carried out at E3 beam at IHEP in June 2017, Proton and pion mixed irradiation, the momentum of the particles are from 400MeV to 1.1GeV
International Workshop on the CEPC 2017
2018/12/26

23. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Test Results
400MeV/c Pion
700MeV/c Pion
1000MeV/c Pion
400MeV/c Proton
700MeV/c Proton
1000MeV/c Proton
International Workshop on the CEPC 2017
2018/12/26

24. International Workshop on the CEPC 2017
2018/12/26
1.1 关键分系统研制
Test Results
dE/dx vs. Momentum
International Workshop on the CEPC 2017
2018/12/26

25. International Workshop on the CEPC 2017
2018/12/26
Outline
Motivation
CEPC ECAL
Sensitive Detector
Electronics
Test Results
Cosmic rays test
Beam test
Summary
International Workshop on the CEPC 2017
2018/12/26

26. International Workshop on the CEPC 2017
2018/12/26
Summary
Optimization of ECAL
Sampling Calorimeter with high granularity sandwich structure
24 X0, 30 layers, 5mm*5mm granularity…
Electronics board based on SPIROC chip was designed
A 90Sr test system was built to test the uniformity plastic scintillator. The uniformity is better than 10%.
An LED system was built to test the SiPM.
The MIPs signals were tested using cosmic rays
One layer prototype will be built in the first half of next year
International Workshop on the CEPC 2017
2018/12/26

27. International Workshop on the CEPC 2017
2018/12/26
Thank You
International Workshop on the CEPC 2017
2018/12/26