Report from the

1
Report from the World-Wide Calorimeter and
Forward Detector Project Day
G. Eigen, Bergen U/DESY
Analog HCAL Meeting, DESY 26-11-2003
2
Agenda of Worldwide Calorimeter Forward
Detector Project Day
TIME TITLE OF TALK
SPEAKER 1400-14.25
Status of GLC Calorimeter RD
Kiyotomo Kawagoe (Kobe
U.) 1425-14.45 Performance of a Strip Array
EM Calorimeter Hiroyuki
Matsunaga (Tsukuba U.) 1445-15.05 Silicon
Calorimetry
Il Hon Park (Ewha Women's
U) 1505-1525 Status of CALICE Si-W
Calorimeter Vaclav
Vrba (Prague) 1525-1535 Status of LCcal
RD
Stefano Miscetti (Frascati) 15.35-1555
Status of ECAL Activities in the US
David Strom
(Oregon) 1555-1620 Status of Analog HCAL
studies Erika
Garutti (DESY) 16.20-1645 Status of Digital
HCAL Activities
Jose Repond (Argonne) 1640-1705 Coffee break
17.05-1725 Analog HCAL Simulation Studies
Vassily Morgunov
(DESY) 17.25-1745 Simulation and Algorithm
Development for Digital HCAL Vishnu Zutshi
(NIU) 1745-18.00 Studies for Calorimeter
Prototypes and Schedule Volker
Korbel (DESY) 1800-18.15 Testbeam Plans

Steve Magill (Argonne) 1815-1835
Optimization of the Design of the Forward
Calorimeters Agnieszka Kowal (Krakov) 1835-1850
Hardware Status of Forward Calorimeters
Igor Emiliantchik (Minsk)

• All talks are on the webpage
• http//www-flc.desy.de/Calice-wwm/montpellier
  -agenda.html

3
ECAL

• Scin Tile/Pb sandwich Analog KEK, Japanese
  U
• Scin Strips/Pb sandwich Analog KEK, Japanese
  U
• Si pixel/W sandwich Analog CALICE,
  SD Oregon
• Scin Tile/W sandwich Analog offset
  layers Colorado
• Si-Scin hybrid /W Analog LCCAL,
  Kansas
• Dense Crystals Analog PbWO4
  Caltech, Iowa

4
Scintillator-Pb ECAL Configurations
Tiles WLS fibers
Sci strips WLS fibers
4cm x 4cm x 1mm-cell
Kiyotomo Kawagoe (Kobe U.)
5
Energy resolution (EMC)

• 4mm-Pb/1mm-Sci (ZEUS type) 15.4/sqrt(E)0.2
  (1994)
• 4mm-Pb/4mm-Sci (Strip-array) 12.9/sqrt(E)0
  (2002)
• 4mm-Pb/1mm-Sci/1mm-Acryl (Tile/fiber) to be
  tested in March
• 2004

Strip-array EMC
ZEUS type EMC
15.4/?E ? 0.2
Data 12.9/?E ? 0.
MC 11.8/?E ? 0.
Kiyotomo Kawagoe (Kobe U.)
6
Combined analysis of SHmax DESY Minical

• The position detector is used as a pre-shower
  detector
• EtotEminicalaEpreshower

Energy resolution
Very preliminary
Very preliminary
a
Kiyotomo Kawagoe (Kobe U.)
7
SHmaxMinical Energy Resolution/Linearity

• Resolution/linearity with a0.56
• Resolution was degraded by the large gap between
  detectors
• Energy resolution agrees with Minical
  Measurements

Energy resolution
Very preliminary
Very preliminary
Electron energy (GeV)
Electron energy (GeV)
Kiyotomo Kawagoe (Kobe U.)
8
Spatial resolution
s 2.0 mm around shower max
Position resolution for 4GeV electron
Hiroyuki Matsunaga (Tsukuba U.)
9
Scintillator-W ECAL Design Plans

• 45 layers 1.75 mm W
• 2 mm scintillator (5?5 cm2)
• 150 ?m Tyvek
• 1 mm gap
• Alternate layers are offset
• Effective ?spatial 2.5?2.5 cm2
• R D plans
• ? Light collection efficiency, uniformity
• ? Find cost-effective construction method
• ? Explore extruded scintillator
• ? Check energy flow with offset ght detection
  options (APD,

David Strom (Oregon)
10
HCAL

• Scin Strips-fiber/Pb Analog Japan
• Scin Tile/SS sandwich Analog CALICE Tile
  CAL, ACFA
• Scin pixels/SS Digital 9 cm2
  hexagonal tiles NIU
• RPC/SS Digital 1 cm X
  1 cm pads (many)
• GEM/SS Digital 1 cm X
  1 cm pads (UTA)

11
Tile-Fiber-Lightyield
Center/straight WLS-fiber
Diagonal/bent WLS-fiber

• No stress on fiber,
• Fiber end reflector
• tile reflector

• more stress on fiber,
• fiber end reflector
• tile reflector

L7.85cm
L7,85cm
L5cm

• clear RO fibers
• l1-3.5m to photodetector
• light attenuation lt18

• 1.4 mm drilled polished hole
• in centre
• For 5 cm straight WLS-fiber RO
• Cheep, for Si PMs only

• Single looped fiber
• strong fiber bending,
• most stress on fibers,
• probably aging damages?

L20cm
Light yield of MIPs (used for calibration)
18-25 pe on photocathode
Volker Korbel (DESY)
12
Light Collection
Readout with Si PM
Readout with PM
11 p.e./MIP
Readout with APDs Hamamatsu S8550
Jose Repond (Argonne)
13
The MiniCal Structure
e 1-6 GeV
Layer configuration
0.1 cm Ø WLF
97 Shower contained

• 1-loop fiber inserted
• into groove
• Single tiles covered
• by 3M reflector

0.5 cm active
2 cm steel
Erika Garutti (DESY)
14
Silicon PM Calibration

• Cosmic and beam calibration of all tiles w/o
  pre-amplifier
• ? reproducibility studies (LPI)
• ? calibration analysis (MEPHI)
• Single photoelectron peak visible with fast
  pre-amplifier
• ? for calibration only

One photoelectron peak
MIP peak
LED
pedestal
1 MIP 25 pe.
Erika Garutti (DESY)
15
Energy Resolution

• good agreement for PM SiPM
• systematic uncertainty needs
• to be determined (fix at 5)
• SiPM is not corrected for
• saturation effects
• Fit function
• Fit values for PM / MC
• a 0.1 ? 0.2 / 0.4 ? 0.1
• b 21.0 ? 0.4 / 17. 1 ? 0.1

Preliminary
Erika Garutti (DESY)
16
APD Beam Tests
LAL/ECAL preamp Charge sensitive Larger gain
Prague preamp Voltage sensitive
APD
s11 ch
s6 ch s23 ch
s13 ch

pedestal
Preamp required gain APD gain gt200 12
mV/7.2fC APD gain lt100 12 mV/1.8fC
Beam MIP
Erika Garutti (DESY)
17
Pre-amp Test of Single Tile with Source
Charge sensitive Minsk preamp Voltage
sensitive preamp Prague Design
ped
Sr MIP
Sr MIP
ped
LED
LED

• Gate adjustment 90 signal contained
• 300 ns
  120 ns
• noise comparison s(ped)/(MIP-ped)
• 5.0/85 0.06
  12.4/82 0.15
• MIP resolution s(MIP)/(MIP-ped)
• 36.4/85 0.42
  42.3/82 0.52

• We have 2 additional preamp prototypes for
  testing

Erika Garutti (DESY)
18
HCAL Studies in Japan

• Use 1-4 GeV e- beam at KEK,
• 10-200 GeV at FNAL

(46.70.6)/?E
Kiyotomo Kawagoe (Kobe U.)
19
Simulations
20
Prototype Layout
Vassily Morgunov (DESY)
21
Neutron Component
Vassily Morgunov (DESY)
22
Software Compensation
Simple weighting
Vassily Morgunov (DESY)
23
Single Particle E Resolution
Non-projective geometry
Vishnu Zutshi (NIU)
24
Multiple thresholds
Vishnu Zutshi (NIU)
25
Reconstructed Jet Resolution
Reconstructed Z mass
60 better
?0.26
ZZ Events
Digital eflow
Cal only
?0.16
Vishnu Zutshi (NIU)
26
PrototypesBeam Tests
27
Example pad sizes increase x 2
3, 6 and 12 cm
20 16
26 10
30 6
Volker Korbel (DESY)
28
Physics prototype stack

• Absorber plates
• Metal sheet
• EN 10 029-16D x 1005 x 1005 S G
• Steel
• Stahl EN 10 025-Fe 360 B
• 36 layers, Fe,
• 16 /- 0.95 mm,
• flatness 3 mm
• cut to 100x100 cm2
• Cassettes
• -Housing plates provided by
• producer of cassettes
• -Sandwich structure
• 6.5 mm scintillator fibers
• 6.5 mm is max
• also for other detector layers
• 2 x 2 mm cover plates, /- 0.95
• 100 x100 cm outer dimensions
• Thickness tolerances gt0.5 mm

Volker Korbel (DESY)
29
Tile-HCAL P-PT for E-flow studies

• Simulation studies needed to specify
• Active volume
• tile sizes vs depth
• tile grouping to cells
• lateral leakage
• longitudinal leakage
• increasing absorber thickness in depth?

10 GeV pions
100 cm
Leakage detector needed!
100 GeV pions
Volker Korbel (DESY)
30
Testbeam Venues
Steve Magill (Argonne)