Dr
Kendall Reeves
(University of Texas at Dallas (US))
06/07/2012, 09:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
The Semi-Conductor Tracker (SCT) and the Pixel Detector are the key precision
tracking devices in the Inner Detector of the ATLAS experiment at CERN LHC.
The SCT is a silicon strip detector and is constructed of 4088 silicon detector modules for a total of 6.3 million strips. Each module is designed, constructed and tested to operate as a stand-alone unit, mechanically, electrically,...
Dr
Erik Butz
(Massachusetts Inst. of Technology (US))
06/07/2012, 09:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
The CMS silicon tracker is the largest silicon detector ever built. It consists of a hybrid pixel detector with 66 million channels and a 200 m2 silicon strip detector with 10 million read out channels. The presentation describes the operation of this detector during the first three year of LHC both during proton-proton as well as heavy ion collisions. Results on the operational performance...
Dr
Carlos Solans Sanchez
(Universidad de Valencia (ES))
06/07/2012, 09:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Its calorimeter system measures the energy and direction of final state particles with pseudo rapidity $|\eta| < 4.9$. Accurate identification and measurement of the characteristics of electromagnetic objects (electrons/photons) are performed by liquid argon (LAr)-lead...
Dr
Riccardo Paramatti
(INFN - Rome I (IT))
06/07/2012, 09:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the LHC is a hermetic, fine grained, homogeneous calorimeter, comprising 75,848 lead tungstate (PbWO4) scintillating crystals, located inside the CMS superconducting solenoidal magnet. The scintillation light is detected by avalanche photodiodes (APDs) in the barrel section and by vacuum phototriodes (VPTs)...
Mr
Eric Torrence
(University of Oregon (US))
06/07/2012, 10:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
A precision luminosity measurement is of critical importance for the ATLAS physics program, both for searches for new physics as well as for precision measurements of Standard Model cross-sections. ย The absolute calibration of the ATLAS luminosity scale is based on beam separation (van der Meer) scans which are used to calibrate a variety of luminosity-sensitive detectors. ย These detectors...
Mr
Nathaniel Jay Odell
(Northwestern University (US))
06/07/2012, 10:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
The CMS Beam Conditions and Radiation Monitoring system (BRM) is installed to protect the CMS detector from high beam losses and to provide feedback to the LHC and CMS on the beam conditions. The Fast Beam Condition Monitor (BCM1F), one of the sub-detectors in the BRM system, is installed inside the pixel volume close to the beam pipe and consists of two planes of 4 modules each located 1.8 m...
Prof.
Marko Mikuz
(University of Ljubljana, Jozef Stefan Institute (SI))
06/07/2012, 10:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
Progress in experimental particle physics in the coming decade depends crucially upon the ability to carry out experiments at high energies and high luminosities. These conditions imply that future experiments will take place in very high radiation areas. In order to perform these complex and expensive experiments new radiation hard technologies will have to be developed. Chemical Vapour...
Dr
Gabriella Pugliese
(Universita e INFN & Politecnico di Bari (IT))
06/07/2012, 11:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
The Drift Tubes (DT) detector in the CMS experiment triggered and recorded high quality data during the LHC run in 2011, observing muons from pp collisions at a center of mass energy of 7 TeV. More than 99% of the detector channels participated in data taking with very good performances in terms of up-time and efficiency. Prompt data were monitored in order to evaluate noise and backgrounds...
Dr
Mansoora Shamim
(University of Oregon (US))
06/07/2012, 11:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
Charged leptons play an important role in the physics programme at the LHC. The performance of identification of charged leptons must be know with high precision. This talk present the studies of the muon and tau identification performance at the ATLAS experiment.
In 2012 the LHC is operated in a mode leading to up to 40 inelastic pp collisions per bunch crossing, so-called โpile-upโ, with...
Dr
Roberto Castello
(Universite Catholique de Louvain (BE))
06/07/2012, 11:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
The CMS all-silicon tracker consists of 16588 modules: aligning them with the desired precision of a few micrometers is only feasible using track based alignment procedures. Ultimate precision is now achieved by the determination of sensor curvatures in addition to the local translation and rotation of modules in space. This challenges the alignment algorithms to determine about 200k...
Dr
Mark James Tibbetts
(Lawrence Berkeley National Laboratory (US))
06/07/2012, 11:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
ATLAS is a multipurpose experiment at the LHC proton-proton collider. In order to
reconstruct trajectories of charged particles, ATLAS is equipped with a tracking system built using different technologies, silicon planar sensors (pixel and micro-strip) and gaseous drifttubes, all embedded in a 2T solenoidal magnetic field. ATLAS physics goals require high resolution, unbiased measurement of...
Mr
Joram Berger
(KIT (DE))
06/07/2012, 12:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
A summary of the measurements of the jet energy calibration in CMS is presented, performed with data samples collected in proton-proton collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 1.6/fb. The final jet energy calibration is based on dijet, ฮณ+jet and Z+jet events. The results are presented for the "Particle Flow" approach, which attempts to...
Prof.
Ariel Gustavo Schwartzman
(SLAC National Accelerator Laboratory (US))
06/07/2012, 12:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
After the analysis of the 2010 proton proton collision data provided by LHC, the ATLAS experiment has achieved an accuracy of the jet energy measurement between 2-4% for jet transverse momenta from 20 GeV to about 2 TeV in the pseudo-rapidity range up to |eta|=4.5. The jet energy scale uncertainty is derived from in-situ single hadron response measurements along with systematic variations in...
Dr
Hubert Kroha
(Max-Planck-Institut fรผr Physik (DE))
06/07/2012, 12:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
For the planned high-luminosity upgrades of the Large Hadron Collider (LHC)increasing background rates of neutrons and gamma rays are expected exceed the rate capability of the current ATLAS muon tracking detectors. Drift-tube chambers with a tube diameter of 15 mm have (sMDT chambers) been developed for upgrades of the ATLAS muon spectrometer. A full sMDT prototype chamber has been...
Prof.
Donald Hartill
(Cornell University (US))
06/07/2012, 12:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
An accelerator complex that can produce ultra-intense beams of muons presents many opportunities to explore new physics. A facility of this type is unique in that, in a relatively straightforward way, it can present a physics program that can be staged and thus move forward incrementally, addressing exciting new physics at each step. An intense cooled low-energy muon source can be used to...
Dr
Jim Brooke
(University of Bristol (UK))
06/07/2012, 14:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
The first level trigger of the CMS experiment is comprised of custom electronics that process data from the calorimeters and muon detectors in order to select the most interesting events from LHC collisions. The rate of events selected by this Level-1 trigger must be reduced from the beam crossing frequency to no more than 100 kHz before detector digitization and High Level Trigger processing...
Dr
Brian Petersen
(CERN (CH))
06/07/2012, 14:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
During the data taking period from 2009 until 2011, the ATLAS trigger has been very successfully used to collect proton-proton data at LHC centre-of-mass energies between 900 GeV and 7 TeV. The three-level trigger system reduces the event rate from the design bunch-crossing rate of 40 MHz to an average recording rate of about 300 Hz. Using custom electronics with input from the calorimeter and...
Dr
Stรฉphanie Beauceron
(Universite Claude Bernard-Lyon I (FR))
06/07/2012, 14:40
Track 13. Detectors and Computing for HEP
Parallel Sessions
The CMS experiment has been designed with a 2-level trigger system: the Level 1 Trigger, implemented using FPGA and custom ASIC technology, and the High Level Trigger (HLT), implemented running a streamlined version of the CMS offline reconstruction software on a cluster of commercial rack-mounted computers, comprising thousands of CPUs. The design of a software trigger system requires a...
Dr
Reiner Hauser
(Michigan State University (US))
06/07/2012, 14:55
Track 13. Detectors and Computing for HEP
Parallel Sessions
The ATLAS DAQ/HLT system reduces the Level 1 rate of 75 kHz to a few kHz event build rate after Level 2 and a few hundred Hz out output rate to disk. It has operated with an average data taking efficiency of about 94% during the recent years. The performance has far exceeded the initial requirements, with about 5 kHz event building rate and 500 Hz of output rate in 2012, driven mostly by...
Dr
Ivan Kresimir Furic
(University of Florida (US))
06/07/2012, 15:10
Track 13. Detectors and Computing for HEP
Parallel Sessions
A key challenge at high luminosity hadron colliders is the selection of sufficiently pure event samples against large QCD backgrounds, whilst keeping data rates within practical bounds. The CMS trigger system performs the first step in event selection, and its performance dictates the physics reach of the experiment in many areas. As LHC luminosity continues to increase over the next decade,...
Dr
Mimmo Della Volpe
(Universitร "Federico II" di Napoli & INFN (IT))
06/07/2012, 15:25
Track 13. Detectors and Computing for HEP
Parallel Sessions
In the coming years, the LHC complex will be upgraded to extend the physics potential of the experiments. The average luminosity will be increased by a factor 5 to 10 above the original design one. The planned upgrades require, among other detector and DAQ system improvements, a significant higher selectivity of the trigger system, to cope with the increased radiation level and particle rates....
Prof.
Franz Muheim
(University of Edinburgh (UK))
06/07/2012, 16:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
The LHCb experiment is designed to perform high-precision measurements of CP violation and search for New Physics using the enormous flux of beauty and charmed hadrons produced at the LHC. The operation and the results obtained from the data collected in 2010 and 2011 demonstrate that the detector is robust and functioning very well. However, the limit of ~1 fb-1 of data per year cannot be...
Dr
Markus Elsing
(CERN (CH))
06/07/2012, 16:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
After successful LHC operation at 7 TeV in 2011, the LHC is scheduled to deliver even more data in 2012. Meanwhile, plans are actively advancing for a series of upgrades, culminating roughly 10 years from now in the high luminosity LHC (HL-LHC) project, delivering of order five times the LHC nominal instantaneous luminosity along with luminosity levelling. The final goal is to extend the data...
Prof.
Jeremy Mans
(University of Minnesota (US))
06/07/2012, 16:35
Track 13. Detectors and Computing for HEP
Parallel Sessions
The LHC has successfully delivered more than 12 /fb of data through operations from 2009-2012, which CMS has used for wide range of physics analyses. CMS is planning a set of detector upgrades beginning in 2013 and continuing to support physics in the HL-LHC era, which will extend the delivered luminosity up to 3000 /fb by 2030. The projects already in the technical design phase in planned...
Dr
Mario Giordani
(INFN Trieste (IT))
06/07/2012, 16:50
Track 13. Detectors and Computing for HEP
Parallel Sessions
The upgrades for the ATLAS Pixel Detector will be staged in preparation for high luminosity LHC. The first upgrade for the Pixel Detector will be the construction of a new pixel layer which will be installed during the first shutdown of the LHC machine, foreseen in 2013-14. The new detector, called the Insertable B-layer (IBL), will be installed between the existing Pixel Detector and a new,...
Mr
Ferdinando Giordano
(University of California Riverside (US))
06/07/2012, 17:05
Track 13. Detectors and Computing for HEP
Parallel Sessions
The present CMS pixel detector was designed for a maximum luminosity of 1ร1034 cmโ2sโ1. Following the Phase 1 upgrade of the LHC, the peak luminosity is foreseen to reach 2ร1034 cmโ2sโ1. Due to the radiation damage and large data losses in the readout chip the present pixel system must be replaced by a new one in the long shutdown of 2016. The current status of the CMS pixel detector upgrade...
Dr
Ralf Hertenberger
(Ludwig-Maximilians-Univ. Mรผnchen (DE))
06/07/2012, 17:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
The ATLAS muon spectrometer performs to the specs of efficiency, occupancy and spatial resolution at present LHC peak-luminosities of $4 \times 10^{33}$ $\frac{1}{cm^2~s}$. Ten times higher peak-luminosities are envisaged after the LHC upgrade by end of this decade. Currently used tracking detectors in the most forward part of the muon spectrometer need to be replaced to cope with the...
Dr
Sudarshan Paramesvaran
(University of California Riverside (US))
06/07/2012, 17:35
Track 13. Detectors and Computing for HEP
Parallel Sessions
The hadron calorimeters of the CMS experiment have successfully recorded data at 7 TeV and 8 TeV center-of-mass energy during 2011 and 2012 LHC operation. The performance of all systems (barrel, end-cap, forward and the outer calorimeters) are discussed and results from the full 2011 dataset are shown on noise rejection, calibration, collision timing, and identification of jet candidates and...
Prof.
Kock Kiam Gan
(Ohio State University (US))
06/07/2012, 17:50
Track 13. Detectors and Computing for HEP
Parallel Sessions
We have designed two ASICs for possible applications in the optical links of a new layer of the ATLAS pixel detector for the initial phase of the LHC luminosity upgrade. The ASICs include a high-speed driver for a VCSEL and a receiver/decoder to extract the data and clock from the signal received by a PIN diode. Both ASICs contain 12 channels for operation with a VCSEL or PIN array. Among...
