Transcript Towards a Scintillator-based (semi)Digital HCal

Towards a Scintillator-based
(semi)Digital HCal
Vishnu V. Zutshi
for the
NICADD/NIU group
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 ?
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N vs. E
0.25mip threshold
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Single Particle E Resolution
Non-projective geometry
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Digital vs. Analog
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Multiple thresholds
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ZZ Events
Stable MC particles
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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
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Energy Fractions
Neutral hadron fraction
g fraction
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Jet E Resolution
rms used
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Layer Stack
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Cosmic Data with PMT
~11 p.e
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Si-PM’s
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Cosmic Data with Si-PM
Light output vs bias
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Number of PE
40
35
30
25
20
15
10
5
0
51
51.5
52
52.5
53
53.5
54
54.5
Bias (Volts)
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Cosmic with APD
Hamamatsu S8550
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Surface Treatment/Wrapping
UNPOLISHED TOP AND
POLISHED BOTTOM
POLISHED TOP AND
POLISHED BOTTOM
0.98
Tyvek
1.00
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Paint
0.89
UNPOLISHED TOP AND
UNPOLISHED BOTTOM
1.00
VM 2002
1.08
Mylar
0.83
1.02
CM590
CM500
0.28
0.44
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Alum Foil
0.63
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Spray It On
Titanium white acrylic
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2 layers
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6 layers
10 layers
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painted
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Miscellaneous Measurements
6cm2/9cm2
Straight/Sigma
Square/Hex
Extruded/Cast
0.95
0.94
0.7
0.95
NICADD scintillator
1mm round Kurray
EJ500/BC600
(optical glues)
Y11/BCF92
1.15
1.0
3.1
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0.8 mm square Bicron
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After/Before glue
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Response vs. Thickness
RESPONSE NORMALIZED TO 3 MM CELL
NORMALIZED CELL RESPONSE OF Cs-137
1.75
1.55
1.35
1.15
y = 0.8426x + 0.1376
R2 = 0.9852
0.95
0.75
0.75
0.95
1.15
1.35
1.55
1.75
CELL THICKNESS NORMALIZED TO 3 MM
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MEPHI-ITEP-DESY Solution
Can the cost be further reduced?
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Thickness Tolerances
Tile F
Side Four Profile
4.92
4.9
3.2
3.1
4.88
Thickness in mm
Thickness of Scintillator in Millimeters
3.3
3
2.9
2.8
2.7
Side one
Side two
4.84
4.82
2.6
4.8
2.5
ELJEN cast
NICADD extruded
2.4
1
2
3
4
5
Position on Side
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4.86
6
7
4.78
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3
4
5
6
Position in 20 cm steps
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Response Dispersion
Column1
Histogram
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6
4
2
Bin
25
-1.06E-06
-1.10E-06
-1.14E-06
-1.18E-06
-1.22E-06
-1.26E-06
-1.30E-06
0
-9.00E-07
10
-9.40E-07
Frequency
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-9.80E-07
14
Mean
-1.14599E-06
Standard Error
6.53057E-09
Median
-1.1464E-06
Mode
-1.10134E-06
Standard Deviation 6.59555E-08
Sample Variance
4.35012E-15
Frequency
Kurtosis
0.427712361
Skewness
0.44298345
Range
3.4981E-07
Minimum
-1.27961E-06
Maximum
-9.298E-07
Sum
-0.000116891
Count
102
Largest(1)
-9.298E-07
Smallest(1)
-1.27961E-06
Confidence Level(95.0%)1.29549E-08
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-1.02E-06
16
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Density-based Clustering
S+  pp0
Eflow
Density weighted
Cal only
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Photon Reconstruction
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Jet Resolution
60% better
Cal only
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eflow
4/30/2020
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
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