The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions. / George, Simon.

2010. 487 Paper presented at 35th International Conference of High Energy Physics , Paris, France.

Research output: Contribution to conferencePaperpeer-review

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The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions. / George, Simon.

2010. 487 Paper presented at 35th International Conference of High Energy Physics , Paris, France.

Research output: Contribution to conferencePaperpeer-review

Harvard

George, S 2010, 'The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions.', Paper presented at 35th International Conference of High Energy Physics , Paris, France, 22/07/10 - 28/07/10 pp. 487. <http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=120>

APA

Vancouver

George S. The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions.. 2010. Paper presented at 35th International Conference of High Energy Physics , Paris, France.

Author

George, Simon. / The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions. Paper presented at 35th International Conference of High Energy Physics , Paris, France.5 p.

BibTeX

@conference{198b95a771bd40e3be2a200c783fd1e4,
title = "The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions.",
abstract = "In 2010 ATLAS has seen the first proton-proton collisions at 7 TeV. Later this year a collision rate of nearly 10 MHz is expected. Events of potential interest for physics analysis are selected by a three-level trigger system, with a final recording rate of about 200 Hz. The first level (L1) is implemented in customised hardware, the two levels of the high level trigger (HLT) are software triggers. The selection is described by the Trigger Configuration in the form of menus, each ofwhich contains more than 500 signatures. Each signature corresponds to a chain of algorithms which reconstruct and refine specific event features. The HLT Steering receives information from the Configuration system, dynamically creates chains and controls the execution of algorithms and flow of information during event processing. The Steering tests each signature on L1-acceptedevents, and those satisfying one or more test are recorded for later analysis. To save execution time, the Steering has a facility to cache results, avoiding later recalculation. To control rate, prescale factors can be applied to L1 or HLT signatures. Where needed for later analysis, theSteering has a test-after-accept functionality to provide the results of the tests for prescaled signatures. To maintain high data taking efficiency it is essential that the trigger can be dynamically re-configured in response to changes in the detector or machine conditions, such as the status of detector readout elements, instantaneous LHC luminosity and beam-spot position. This relies on techniques that allow configuration changes, such as L1 and HLT prescale updates, to be made during a run without disrupting data taking, while ensuring a consistent and reproducible configuration across the entire HLT farm. We present the performance of the steering and configuration system during collisions and the expectations for the first phase of LHC exploitation.",
author = "Simon George",
year = "2010",
language = "English",
pages = "487",
note = "35th International Conference of High Energy Physics ; Conference date: 22-07-2010 Through 28-07-2010",

}

RIS

TY - CONF

T1 - The ATLAS High Level Trigger Configuration and Steering Software; Experience with 7 TeV Collisions.

AU - George, Simon

PY - 2010

Y1 - 2010

N2 - In 2010 ATLAS has seen the first proton-proton collisions at 7 TeV. Later this year a collision rate of nearly 10 MHz is expected. Events of potential interest for physics analysis are selected by a three-level trigger system, with a final recording rate of about 200 Hz. The first level (L1) is implemented in customised hardware, the two levels of the high level trigger (HLT) are software triggers. The selection is described by the Trigger Configuration in the form of menus, each ofwhich contains more than 500 signatures. Each signature corresponds to a chain of algorithms which reconstruct and refine specific event features. The HLT Steering receives information from the Configuration system, dynamically creates chains and controls the execution of algorithms and flow of information during event processing. The Steering tests each signature on L1-acceptedevents, and those satisfying one or more test are recorded for later analysis. To save execution time, the Steering has a facility to cache results, avoiding later recalculation. To control rate, prescale factors can be applied to L1 or HLT signatures. Where needed for later analysis, theSteering has a test-after-accept functionality to provide the results of the tests for prescaled signatures. To maintain high data taking efficiency it is essential that the trigger can be dynamically re-configured in response to changes in the detector or machine conditions, such as the status of detector readout elements, instantaneous LHC luminosity and beam-spot position. This relies on techniques that allow configuration changes, such as L1 and HLT prescale updates, to be made during a run without disrupting data taking, while ensuring a consistent and reproducible configuration across the entire HLT farm. We present the performance of the steering and configuration system during collisions and the expectations for the first phase of LHC exploitation.

AB - In 2010 ATLAS has seen the first proton-proton collisions at 7 TeV. Later this year a collision rate of nearly 10 MHz is expected. Events of potential interest for physics analysis are selected by a three-level trigger system, with a final recording rate of about 200 Hz. The first level (L1) is implemented in customised hardware, the two levels of the high level trigger (HLT) are software triggers. The selection is described by the Trigger Configuration in the form of menus, each ofwhich contains more than 500 signatures. Each signature corresponds to a chain of algorithms which reconstruct and refine specific event features. The HLT Steering receives information from the Configuration system, dynamically creates chains and controls the execution of algorithms and flow of information during event processing. The Steering tests each signature on L1-acceptedevents, and those satisfying one or more test are recorded for later analysis. To save execution time, the Steering has a facility to cache results, avoiding later recalculation. To control rate, prescale factors can be applied to L1 or HLT signatures. Where needed for later analysis, theSteering has a test-after-accept functionality to provide the results of the tests for prescaled signatures. To maintain high data taking efficiency it is essential that the trigger can be dynamically re-configured in response to changes in the detector or machine conditions, such as the status of detector readout elements, instantaneous LHC luminosity and beam-spot position. This relies on techniques that allow configuration changes, such as L1 and HLT prescale updates, to be made during a run without disrupting data taking, while ensuring a consistent and reproducible configuration across the entire HLT farm. We present the performance of the steering and configuration system during collisions and the expectations for the first phase of LHC exploitation.

M3 - Paper

SP - 487

T2 - 35th International Conference of High Energy Physics

Y2 - 22 July 2010 through 28 July 2010

ER -