Towards a Scintillatorbased semiDigital HCal

1
Towards a Scintillator-based (semi)Digital HCal

• Vishnu V. Zutshi
• for the
• NICADD/NIU group

2
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 ?

3
Energy Resolution ?
4
N vs. E
0.25mip threshold
5
Single Particle E Resolution
Non-projective geometry
6
Digital vs. Analog
7
Multiple thresholds
8
ZZ Events
Stable MC particles
9
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

10
Energy Fractions
Neutral hadron fraction
g fraction
11
Jet E Resolution
rms used
12
Layer Stack
13
Enough Light ?
14
Cosmic Data with PMT
11 p.e
15
Si-PMs
16
Cosmic Data with Si-PM
17
Cosmic with APD
Hamamatsu S8550
18
Tile-Fiber Processing
19
Surface Treatment/Wrapping
20
Spray It On
Titanium white acrylic
21
Miscellaneous Measurements
NICADD scintillator
1mm round Kurray
0.8 mm square Bicron
22
Response vs. Thickness
23
MEPHI-ITEP-DESY Solution
Can the cost be further reduced?
24
Thickness Tolerances
ELJEN cast
NICADD extruded
25
Response Dispersion
26
Digital Eflow?
27
Density-based Clustering
S ? pp0
Eflow
Density weighted
Cal only
28
Photon Reconstruction
29
Jet Resolution
60 better
eflow
Cal only
30
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