CMS Experiment

1
CMS Experiment

• CMS Hadron Calorimeter - Arie Bodek
• University of Rochester
• DoE Review (15 min Talk) - Wednesday, July 23,
  2003
• I will only talk about Rochester contributions
• WeRochester CDF Plug Upgrade/CMS-HCAL Task D
  Group)
• Brief History - Rochester CDF-Plug Upgrade Group
  
• We invented Megatile-Tile-Fiber Technology for
  CDF
• We built the CDF-Plug HCAL
• We tested and calibrated CDF-Plug Upgrade
  Calorimeter in test beam
• We developed very large Megatile technology for
  CMS-Barrel HCAL
• We are building all the HCAL Megatiles. Optical
  Cables, Optical Decoders/Photodetector Boxes for
  CMS -HCAL
• We installed all the Megatiles into CMS-HCAL at
  CERN
• We have have built an ECAL module for the CERN
  test beam
• Rochester (Slattery-Lobkowicz-Ginther) built the
  massive test beam table
• We have led and are leading test beam efforts and
  analyses at CERN
• We are now in charge of all of US-CMS
  installation at CERN

2
Outline

• Overview
• CMS-HCAL Rochester Group
• Past CMS HCAL Activities at U of R
• Test Beam Motion Table (Slattery/Ginther)
• 1995 and 1996 HCAL Test Beam at CERN (data
  taking, analysis, NIM article)
• Design of the HCAL Optics System
• Construction of Scintillator Megatiles for Hadron
  Barrel Calorimeter
• Rochester L3 Management Responsibilities,
  Fermilab FY98-F03
• Present CMS HCAL Activities
• HCAL Installation and Commissioning, CERN FY03-07
• TestBeam Activities, 2002, 2003, 2004
• Summary

3
Rochester CMS HCAL Group

• Physicists ( at Rochester, FNAL, CERN)
• Prof. Arie Bodek (25 CMS, 25 Neutrino, 50
  CDF) - current effort
• Prof. Paul Slattery (mostly Dzero now)
• Pawel de Barbaro (Senior RA) - At CERN - 90 CMS
  (rest CDF)
• Howard Budd (Senior RA) - At FNAL - 30 CMS
  (rest CDF, Neutrino)
• George Ginther (Senior RA) - At FNAL - 5 CMS
  (rest Dzero)
• Willis Sakumoto (Senior RA) - At FNAL - 5 CMS
  (rest CDF)
• Y, S. Chung (RA) - at FNAL - 5 CMS (rest CDF)
• Technical Staff (we had 6 techs, now down to 4)
• Dan Ruggiero (lab engineer) - 100 CMS Project
  Funds (At FNAL)
• Janina Gielata (technician) - 100 CMS Project
  Funds (At FNAL)-gtTOB
• Agnieszka Sanocka (technician) -100 CMS Projectd
  Funds (At FNAL)-gtTOB
• Heng Bao Zeng (technician) - 100 CMS Project
  Funds (AT FNAL)
• Tom Haelen (Engineer) - At Rochester
• Summer Students
• Matthias Imboden (Bern U., 2002-US citizen
  NSF-REU) - at CERN summer
• Pawel Sopicki (Jagellonian U., 2003) - at CERN
  summer
• Administrative Staff
• Sue Brightman and Judy Mack

4
Installing Megatiles at CERN
Rochester CDF Plug Group was in charge of CMS
HCAL megatile construction at Fermilab and
installation at CERN. Rochester technical staff
flew to CERN. Megatile design made this a rather
simple job.
5
Status of HCAL detectors, May 2003
HB
HE
6
H2 Testbeam - Motion Table built by Rochester
Dzero Group
Built by Slattery, Lobkowicz, Ginther and
Engineer Tom Haelen
HO
HB
HE
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CMS Detector
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US responsibilities in HCAL

• Rochester is responsible for all of HB optics. US
  responsible for all readout electronics
• US is also responsible for readout electronics
  for HE and HO subdetectors

HO 2.2 HB 2.1
HF 2.5
HE 2.3
9
Design of Optical System

• Scintillation light is collected by wavelength
  shifting (WLS) fibers embedded in the tiles
• Outside the tile, WLS fibers are spliced to clear
  fibers
• Clear optical fiber cables with mass terminated
  connectors carry light to the outside of the
  detector ----gt UNIT IS A MEGATILE read by
  Optical Cables with Connectors
• Decoder boxes re-group fibers from layer-wise to
  tower-wise scheme and house photodetectors
• CMS HCAL HB, HE and HO have adopted most of
  design features of the CDF End Plug Upgrade

10
Techical issues specific to CMS

• Calorimeter Performance in 4 Tesla Magnetic field
• magnetic field has two-fold effect on the
  response of the
• calorimeter. First it changes light yield of
  the scintillator
• and secondly, it affects the particle shower
  development.
• The second effect depends on the field
  orientation.
• HCAL resolution with and w/o crystal ECAL
• presence of highly non-compensating lead
  tungstate crystal electromagnetic calorimeter
  (ECAL) degrades the overall response of the
  combined ECALHCAL calorimeter to hadrons.
• Radiation damage of clear and WLS fibers
• assuming int. luminosity of 5x105 pb-1 for
  first ten years
• of LHC operations, radiation dose will reach
  30 kRads for HB (eta1.1). Radiation dose scales
  with 1/theta3, so that
• high eta region (eta 2.8, HE) is affected
  most (2.4 Mrads).

11
Rochester Management Responsibilities

• P. de Barbaro was L3 manager responsible for HCAL
  Optics
• Rochester managed the production of megatiles for
  Hadron Barrel Calorimeter
• Purchasing of materials (over 2M)
• Organization of production (14
  technicians, 3 years)
• Quality control (light yield,
  uniformity)
• L3 manager responsibilities included supervision
  of several institutes working on the HCAL
  Optics
• Production of scintillator megatiles and optical
  cables has been completed on time
• All HB scintillators have been installed into the
  absorber in 2002

12
HCAL Calibration

• Goal Calibrate from test beam to 3.
• Time in HCAL electronics.
• Monitor performance, including radiation
  damage.
• Tools 1. Nitrogen laser distributed to each
  sub-detector. Excites scintillator
• 2. Laser injects light to photo-detectors.
• 3. LEDs (fast) inject light to photodetector.
  Programmable pulser.
• 4. Moving wire radioactive source for long
  term calibration.
• 5. Charge injection to ADCs (QIE).
• Specialized calibration modules designed and
  built to achieve goals.

13
HCAL Test Beam activities

• HCAL had a major test beam effort in 1995 and
  1996
• The focus of these test beams were to resolve
  some technical issues prior to completing the
  design of optics
• UR played a major role in these test beams
• Lobkowicz/Slattery/Ginther/Haelen have designed
  and constructed HCAL Motion table, able to carry
  over 100t of detectors
• P. de Barbaro was the corresponding author of NIM
  article sumarizing these test beam results -
  analysis done by Rochester

14
Source / Beam Data
m-
e-
RMS 3
RMS 2
We verified wire source calibration works (with
muons and electrons) ? use to get absolute
calibration to 2 3
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TB 2002 versus GEANT4
Resolution
Linearity
Shape difference e/h (e.m. nuclear x-sec),
leakage?
suppressed zero
The agreement is excellent in all the energy range
Data systematic error analysis in progress
Validate GEANT4 physics models
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Test Beam in 2003

• Present test beam runs focus on verification of
  electronics
• We are testing two 20deg HB wedges, 20 deg of HE
  module, and 30deg of HO
• 40 MHz Charge Integrators (QIE) send data to HCAL
  Trigger Cards (HTR) via 1.6 GHz link
• For each channel, we collect 20 time slices, each
  time slice is 25ns wide
• In addition, we have ECAL module (100 PbWO4
  crystals with PMT readout, module
  designed/built/tested by UR) to study response of
  the combined ECALHCAL, especially in the 53deg
  crack region.

17
Rochester Responsibilities at CERN

• P. de Barbaro has assumed responsibilities of
  Installation and Commissioning Coordinator for
  HCAL at CERN
• Rochester responsibilities cover installation of
  scintillators, optical cables, radioactive source
  tubes, readout electronics, cooling.
• Testing of entire chain (scintillator,
  photodetector, QIE, DAQ) vertical slice test

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Rochester CMS HCAL task summary

• Rochester lead the design, management and
  production of the optics system for the HCAL
  Barrel and corresponding test beam activities,
• Production of scintillator megatiles and optical
  cables has been completed. Several test beam runs
  completed - First NIM article published
• Rochester is now responsible for installation and
  commissioning of HCAL detector at CERN
• Rochester Major Tasks in 2003-2004
• installation of HB, HE and HO scintillators,
  optical cables and readout electronics at CERN
• Test and integration of full HCAL readout and DAQ
  with other sub-detectors (vertical slice test) at
  CERN
• At Fermilab, continue construction of Optical
  Decoder Boxes and Electronics.
• Provide Root Support and Test Beam Analysis - CMS
  supplemental request for a postdoc to be at CERN.