Transcript CMS Experiment CMS Hadron Calorimeter - Arie Bodek

Rochester
HCAL
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
We==Rochester CDF Plug Upgrade/CMS-HCAL Task D Group)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
1
Rochester
•
HCAL
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
2
Rochester
HCAL
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)->TOB
Agnieszka Sanocka (technician) -100% CMS Projectd Funds (At FNAL)->TOB
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
3
Rochester
HCAL
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.
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
4
Rochester
HCAL
Status of HCAL detectors,
May 2003
HE
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
HB
5
H2 Testbeam - Motion Table
built by Rochester Dzero Group
Rochester
HCAL
Built by
HO
HB
Slattery,
Lobkowicz,
Ginther and
Engineer
Tom Haelen
HE
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
6
Rochester
HCAL
CMS Detector
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
7
Rochester
HCAL
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
8
Rochester
HCAL
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 ----> 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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
9
Rochester
HCAL
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 ECAL+HCAL calorimeter
to hadrons.
• Radiation damage of clear and WLS fibers
assuming int. luminosity of 5x10**5 pb-1 for first ten years
of LHC operations, radiation dose will reach 30 kRads for
HB (eta=1.1). Radiation dose scales with 1/theta**3, so that
high eta region (eta ~2.8, HE) is affected most (2.4 Mrads).
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
10
Rochester
HCAL
•
•
•
•
•
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
11
Rochester
HCAL
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 ADC’s (QIE).
Specialized calibration modules designed and built to
achieve goals.
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
12
Rochester
HCAL
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
13
Rochester
HCAL
Source / Beam Data
e RMS 2%
-
m- RMS 3%
We verified wire source calibration works
(with muons and electrons)
 use to get absolute calibration to 2 – 3 %
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
14
Rochester
TB 2002 versus GEANT4
HCAL
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
15
Rochester
HCAL
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 ECAL+HCAL,
especially in the 53deg crack region.
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
16
Rochester
HCAL
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
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
17
Rochester
HCAL
•
•
•
•
1.
2.
3.
4.
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.
University of Rochester DoE Review: CMS Experiment, Arie Bodek, July 23, 2003
18