1. Towards a Scintillator-based (semi)Digital HCal
Vishnu V. Zutshi
for the
NICADD/NIU group

2. Calice DHCal Meeting, DESY
Introduction
Can a reasonable case for a scintillator-based (semi)digital HCal (~ 9cm2 cells) be made?
can E resolution be maintained ?
is there enough light ?
can cell processing be simplified ?
can Eflow algorithms be developed ?
Calice DHCal Meeting, DESY
11/3/2019

3. Calice DHCal Meeting, DESY
Energy Resolution ?
Calice DHCal Meeting, DESY
11/3/2019

4. Calice DHCal Meeting, DESY
N vs. E
0.25mip threshold
Calice DHCal Meeting, DESY
11/3/2019

5. Single Particle E Resolution
Non-projective geometry
Calice DHCal Meeting, DESY
11/3/2019

6. Calice DHCal Meeting, DESY
Digital vs. Analog
Calice DHCal Meeting, DESY
11/3/2019

7. Calice DHCal Meeting, DESY
Multiple thresholds
Calice DHCal Meeting, DESY
11/3/2019

8. Calice DHCal Meeting, DESY
ZZ Events
Stable MC particles
Calice DHCal Meeting, DESY
11/3/2019

9. Calice DHCal Meeting, DESY
Recipe
Energy Smearing
Fit s as a function of incident E (slide5) and smear neutral hadrons accordingly
g ~ 17%/sqrt(E), generated E for charged hadrons
Jet Reconstruction
pT order stable MC particles (ignoring neutrinos)
start with highest pT particle and cluster in 0.7 cone
repeat for remaining particles
Calice DHCal Meeting, DESY
11/3/2019

10. Calice DHCal Meeting, DESY
Energy Fractions
Neutral hadron fraction
g fraction
Calice DHCal Meeting, DESY
11/3/2019

11. Calice DHCal Meeting, DESY
Jet E Resolution
rms used
Calice DHCal Meeting, DESY
11/3/2019

12. Calice DHCal Meeting, DESY
Layer Stack
Calice DHCal Meeting, DESY
11/3/2019

13. Calice DHCal Meeting, DESY
Enough Light ?
Calice DHCal Meeting, DESY
11/3/2019

14. Calice DHCal Meeting, DESY
Cosmic Data with PMT
~11 p.e
Calice DHCal Meeting, DESY
11/3/2019

15. Calice DHCal Meeting, DESY
Si-PM’s
Calice DHCal Meeting, DESY
11/3/2019

16. Calice DHCal Meeting, DESY
Cosmic Data with Si-PM
Calice DHCal Meeting, DESY
11/3/2019

17. Calice DHCal Meeting, DESY
Cosmic with APD
Hamamatsu S8550
Calice DHCal Meeting, DESY
11/3/2019

18. Tile-Fiber Processing
Calice DHCal Meeting, DESY
11/3/2019

19. Surface Treatment/Wrapping
UNPOLISHED TOP AND
POLISHED BOTTOM
POLISHED TOP AND
UNPOLISHED BOTTOM
0.98
1.00
1.02
Tyvek
Paint
VM 2002
Mylar
CM590
CM500
Alum Foil
1.00
0.89
1.08
0.83
0.28
0.44
0.63
Calice DHCal Meeting, DESY
11/3/2019

20. Calice DHCal Meeting, DESY
Spray It On
Titanium white acrylic
Calice DHCal Meeting, DESY
11/3/2019

21. Miscellaneous Measurements
6cm2/9cm2
Straight/Sigma
Square/Hex
Extruded/Cast
0.95
0.94
0.7
NICADD scintillator
1mm round Kurray
After/Before glue
EJ500/BC600
(optical glues)
Y11/BCF92
1.15
1.0
3.1
0.8 mm square Bicron
Calice DHCal Meeting, DESY
11/3/2019

22. Calice DHCal Meeting, DESY
Response vs. Thickness
Calice DHCal Meeting, DESY
11/3/2019

23. MEPHI-ITEP-DESY Solution
Can the cost be further reduced?
Calice DHCal Meeting, DESY
11/3/2019

24. Calice DHCal Meeting, DESY
Thickness Tolerances
ELJEN cast
NICADD extruded
Calice DHCal Meeting, DESY
11/3/2019

25. Calice DHCal Meeting, DESY
Response Dispersion
Calice DHCal Meeting, DESY
11/3/2019

26. Calice DHCal Meeting, DESY
Digital Eflow?
Calice DHCal Meeting, DESY
11/3/2019

27. Density-based Clustering
S+  pp0
Eflow
Density weighted
Cal only
Calice DHCal Meeting, DESY
11/3/2019

28. Photon Reconstruction
Calice DHCal Meeting, DESY
11/3/2019

29. Calice DHCal Meeting, DESY
Jet Resolution
60% better
eflow
Cal only
Calice DHCal Meeting, DESY
11/3/2019

30. Calice DHCal Meeting, DESY
Summary
It is reasonable to consider a scintillator-based (semi)digital HCal (~ 9cm2 cells)
E resolution can be maintained
there is enough light
cell processing can be simplified
digital Eflow algorithms can be developed
Calice DHCal Meeting, DESY
11/3/2019