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Dual readout calorimeter for CepC

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Presentation on theme: "Dual readout calorimeter for CepC"— Presentation transcript:

1 Dual readout calorimeter for CepC
Franco Bedeschi CDR International Review, Beijing, September 2018 OUTLINE Basic requirements Detector description Detector performance IDEA implementation Future work CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

2 e+e- HZ physics constraints
Calorimeters: Hgg  ECAL resolution As good as possible – at least 16%/ 𝐸 + 1% Hqq, VV  ECAL+HCAL resolution As good as possible – at least 3-4% on jets from W,Z decay (*) LHC may observe these channels with similar ot better precision before CepC CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

3 e+e- Z/WW physics constraints
Additional EW physics drivers: High precision acceptance determination Good e/g/p0 discrimination CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

4 Other drivers p0 important in tau and HF physics
Zt+t- t+r+np+p0n 2 m 2 m p0 important in tau and HF physics No p0: 35% t  l (e, m) nn + 20% t(1,3)p± ln 1 p0: 28% t(1,3)p±p0ln 2 -3p0: 10% tp± (2,3) p0ln High granularity/Pre-shower  p0 identification Overlap with p+ may require longitudinal segmentation FCC week, Amsterdam, April 2018 F. Bedeschi, INFN-Pisa

5 Dual Readout calorimeter
Dual Readout Calorimeters main features Designed to optimize EM, hadronic and jet resolution Large sampling fraction for good EM resolution Event by event correction for EM fluctuations in showers and jets Intrinsic transverse granularity up to 1-2 mm Potential for longitudinal segmentation with timing or specific fiber geometries Particle ID capabilities Fast detector response All electronics in the back simplifies cooling and access CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

6 Basic configuration Alternate clear and scintillating fibers in metal matrix Scintillating fibers sensitive to all charged particles Clear fibers sense only Cherenkov light Mostly electrons and positrons CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

7 Working principle Measure simultaneously:
Scintillation signal (S) Cherenkov signal (Q) Calibrate both signals with e- Unfold event by event fem to obtain corrected energy CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

8 Performance EM Use test beam data to tune simulation
Use simulation to correct for lateral leakage CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

9 Radial shower profile Test beam data CDR Review, Beijing, Nov. 2018
F. Bedeschi, INFN-Pisa

10 Radial shower profile Test beam tuned simulation 100 GeV p0
50 GeV electrons 100 GeV p0 CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

11 Performance HAD Use test beam data to tune simulation
Use simulation to correct for lateral leakage 81 and 91 GeV jet separation CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

12 Particle ID Test beam Test beam tuned simulation Hadrons
80 GeV electron proton separation Rejection power 98% efficiency Electrons Hadrons Mu S+Q Q S CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

13 IDEA implementation Calorimeter outside thin coil Pre-shower in front
Improve p0 ID Improve acceptance determination CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

14 IDEA implementation Projective geometry Full coverage Wedge geometry
CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

15 Readout Dual layer SiPM readout Avoids optical cross-talk
3rd test beam in progress CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

16 Readout Group SiPM to reduce numbers of channels ASIC SiPM Output FPGA
8 fibers/channel  5.6 mm granularity Parallel to serial readout ASIC under study ASIC SiPM Output FPGA CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

17 Future work Physics benchmarks with full simulation Mechanics:
Metal matrix technology Fast module assembly Calorimeter support Electronics SiPM readout optimization (pixel size and x-talk) Define readout chain ASIC selection or development Signal processing on detector Readout and back-end design Explore timing for longitudinal information CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

18 Backup BACKUP CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

19 e+e- operation modes Wide range of running conditions at CepC
Z pole (90 GeV): ~ 10 ns between beam crossing High luminosity O(1035) ZH (250 GeV): ~ 1 ms between beam crossing Moderate luminosity - O(1034) CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

20 CepC, FCC, ILC, CLIC luminosity comparison
Z WW ZH 𝒕 𝒕 100xLEP FCC SR power/beam < 50 MW CepC SR power/beam < 30 MW INFN Town Meeting, Roma 2018 F. Bedeschi, INFN-Pisa

21 2T solenoid Two options: Large bore (R=3.7 m) – calorimeter inside
Smaller bore (R=2.2 m) – calorimeter outside Preferred: simpler/ Extreme EM resolution not needed Thick calorimeter Thin (30 cm): total = 0.74 X0 (0.16 l) at q = 90º Courtesy of H. ten Kate et al. CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

22 Calorimeter Copper dual readout calorimeter Demonstrated EM resolution
Observed Had resolution dominated by lateral leakage (~6%) Courtesy of DREAM/RD52 CDR Review, Beijing, Nov. 2018 F. Bedeschi, INFN-Pisa

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