Pub Date : 2014-11-28DOI: 10.1109/NSSMIC.2013.6829408
S. Schanne, H. Le Provost, P. Kestener, A. Gros, Marin Cortial, D. Götz, P. Sizun, F. Château, B. Cordier
The on-board Scientific Trigger Unit (UTS) is designed to detect Gamma Ray Bursts (GRBs) in real-time, using the data produced by the ECLAIRs camera, foreseen to equip the future French-Chinese satellite mission SVOM (Space-based Variable Objects Monitor). The UTS produces GRB alerts, sent to the ground for GRB follow-up observations, and requests the spacecraft slew to repoint its narrow field instruments onto the GRB afterglow. Because of the diversity of GRBs in duration and variability, two simultaneously running GRB trigger algorithms are implemented in the UTS, the so called Image Trigger performing systematic sky image reconstruction on time scales above 20 s, and the Count-Rate Trigger, selecting a time scale from 10 ms to 20 s showing an excess in count-rate over background estimate, prior to imaging the excess for localization on the sky. This paper describes both trigger algorithms and their implementation in a library, compiled for the Scientific Software Model (SSM) running on standard Linux machines, and which can also be cross-compiled for the Data Processing Model (DPM), in order to have the same algorithms running on both platforms. While the DPM permits to validate the hardware concept and benchmark the algorithms (see paper II), the SSM allows to optimize the algorithms and estimate the GRB trigger-rate of ECLAIRs/UTS. The result of running on the SSM a dynamic photon by photon simulation based on the BATSE GRB catalog is presented.
{"title":"A Scientific Trigger Unit for space-based real-time gamma ray burst detection I - Scientific software model and simulations","authors":"S. Schanne, H. Le Provost, P. Kestener, A. Gros, Marin Cortial, D. Götz, P. Sizun, F. Château, B. Cordier","doi":"10.1109/NSSMIC.2013.6829408","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829408","url":null,"abstract":"The on-board Scientific Trigger Unit (UTS) is designed to detect Gamma Ray Bursts (GRBs) in real-time, using the data produced by the ECLAIRs camera, foreseen to equip the future French-Chinese satellite mission SVOM (Space-based Variable Objects Monitor). The UTS produces GRB alerts, sent to the ground for GRB follow-up observations, and requests the spacecraft slew to repoint its narrow field instruments onto the GRB afterglow. Because of the diversity of GRBs in duration and variability, two simultaneously running GRB trigger algorithms are implemented in the UTS, the so called Image Trigger performing systematic sky image reconstruction on time scales above 20 s, and the Count-Rate Trigger, selecting a time scale from 10 ms to 20 s showing an excess in count-rate over background estimate, prior to imaging the excess for localization on the sky. This paper describes both trigger algorithms and their implementation in a library, compiled for the Scientific Software Model (SSM) running on standard Linux machines, and which can also be cross-compiled for the Data Processing Model (DPM), in order to have the same algorithms running on both platforms. While the DPM permits to validate the hardware concept and benchmark the algorithms (see paper II), the SSM allows to optimize the algorithms and estimate the GRB trigger-rate of ECLAIRs/UTS. The result of running on the SSM a dynamic photon by photon simulation based on the BATSE GRB catalog is presented.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129134130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-24DOI: 10.1109/NSSMIC.2013.6829754
Y. Nishimura, T. Takahashi, K. Sakaue, M. Washio, T. Takatomi, J. Urakawa
We have been developing an S-band Cs-Te photocathode rf electron gun system for various application researches such as pulse radiolysis experiments and laser Compton scattering experiments at Waseda University. These researches demande for high quality and well controlled electron beam. In order to measure the ultra-short electron bunch, we decided to use rf-deflector cavity, which can convert the longitudinal distribution to the transverse. With this technique, the longitudinal bunch profile can be obtained as the transverse profile on the screen monitor. We used the 3D electromagnetic field simulation codes HFSS for designing rf-deflector cavity and GPT for beam tracking. The cavity has two-cell structures operating on π-mode, standing wave, dipole(TM120)mode at 2856 MHz. We have confirmed on HFSS that two-cell rf-deflector cavity can produce 660 G magnetic field per cell on beam line with 750 kW input rf-power. This field strength is equivalent with our target, which is 100 fs bunch length measurement at 4.3 MeV. In this paper, we will present the cavity structure design, and the measurement results of manufactured cavity.
{"title":"Study on two-cell rf-deflector cavity for ultra-short electron bunch measurement","authors":"Y. Nishimura, T. Takahashi, K. Sakaue, M. Washio, T. Takatomi, J. Urakawa","doi":"10.1109/NSSMIC.2013.6829754","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829754","url":null,"abstract":"We have been developing an S-band Cs-Te photocathode rf electron gun system for various application researches such as pulse radiolysis experiments and laser Compton scattering experiments at Waseda University. These researches demande for high quality and well controlled electron beam. In order to measure the ultra-short electron bunch, we decided to use rf-deflector cavity, which can convert the longitudinal distribution to the transverse. With this technique, the longitudinal bunch profile can be obtained as the transverse profile on the screen monitor. We used the 3D electromagnetic field simulation codes HFSS for designing rf-deflector cavity and GPT for beam tracking. The cavity has two-cell structures operating on π-mode, standing wave, dipole(TM120)mode at 2856 MHz. We have confirmed on HFSS that two-cell rf-deflector cavity can produce 660 G magnetic field per cell on beam line with 750 kW input rf-power. This field strength is equivalent with our target, which is 100 fs bunch length measurement at 4.3 MeV. In this paper, we will present the cavity structure design, and the measurement results of manufactured cavity.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127121449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-03DOI: 10.1109/NSSMIC.2013.6829552
A. Gianelle, S. Amerio, D. Bastieri, M. Corvo, W. Ketchum, Ted Liu, A. Lonardo, D. Lucchesi, S. Poprocki, R. Rivera, L. Tosoratto, P. Vicini, P. Wittich
Interest in many-core architectures applied to real time selections is growing in High Energy Physics (HEP) experiments. In this paper we describe performance measurements of many-core devices when applied to a typical HEP online task: the selection of events based on the trajectories of charged particles. We use as benchmark a scaled-up version of the algorithm used at CDF experiment at Tevatron for online track reconstruction - the SVT algorithm - as a realistic test-case for low-latency trigger systems using new computing architectures for LHC experiment. We examine the complexity/performance trade-off in porting existing serial algorithms to many-core devices. We measure performance of different architectures (Intel Xeon Phi and AMD GPUs, in addition to NVidia GPUs) and different software environments (OpenCL, in addition to NVidia CUDA). Measurements of both data processing and data transfer latency are shown, considering different I/O strategies to/from the many-core devices.
{"title":"Applications of many-core technologies to on-line event reconstruction in High Energy Physics experiments","authors":"A. Gianelle, S. Amerio, D. Bastieri, M. Corvo, W. Ketchum, Ted Liu, A. Lonardo, D. Lucchesi, S. Poprocki, R. Rivera, L. Tosoratto, P. Vicini, P. Wittich","doi":"10.1109/NSSMIC.2013.6829552","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829552","url":null,"abstract":"Interest in many-core architectures applied to real time selections is growing in High Energy Physics (HEP) experiments. In this paper we describe performance measurements of many-core devices when applied to a typical HEP online task: the selection of events based on the trajectories of charged particles. We use as benchmark a scaled-up version of the algorithm used at CDF experiment at Tevatron for online track reconstruction - the SVT algorithm - as a realistic test-case for low-latency trigger systems using new computing architectures for LHC experiment. We examine the complexity/performance trade-off in porting existing serial algorithms to many-core devices. We measure performance of different architectures (Intel Xeon Phi and AMD GPUs, in addition to NVidia GPUs) and different software environments (OpenCL, in addition to NVidia CUDA). Measurements of both data processing and data transfer latency are shown, considering different I/O strategies to/from the many-core devices.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114902902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-22DOI: 10.1109/NSSMIC.2013.6829814
Jiwoong Seo
The Resistive Plate Chambers (RPC) are a part of the muon spectrometer for the Compact Muon Solenoid (CMS) experiment at Large Hadron Collider (LHC). More than 3000 m2 of RPC system was successfully operated with a closed loop gas system in the first three-running-years of the LHC. Annual campaigns were done during 2011 and 2012 to measure the gas leak rates of the RPCs and the results were compared to the flow-cell readout data. The total leak rate on the barrel increased between 2011 and 2012 while the total rate on the endcaps was negligible during the same period. Consequently, the CMS gas consumption increased, but the gas leaks could not be repaired during the whole period of the data taking at the LHC that lasted more than two years. Here, we present the results of the extensive tests for the first long shutdown period of LHC, including the leak detection in the chambers (internal leak) or gas pipes and connectors (external leak), details on the new leak measurement, and the status of a leak repair.
{"title":"Optimization of the gas system in the CMS RPC detector at the LHC","authors":"Jiwoong Seo","doi":"10.1109/NSSMIC.2013.6829814","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829814","url":null,"abstract":"The Resistive Plate Chambers (RPC) are a part of the muon spectrometer for the Compact Muon Solenoid (CMS) experiment at Large Hadron Collider (LHC). More than 3000 m2 of RPC system was successfully operated with a closed loop gas system in the first three-running-years of the LHC. Annual campaigns were done during 2011 and 2012 to measure the gas leak rates of the RPCs and the results were compared to the flow-cell readout data. The total leak rate on the barrel increased between 2011 and 2012 while the total rate on the endcaps was negligible during the same period. Consequently, the CMS gas consumption increased, but the gas leaks could not be repaired during the whole period of the data taking at the LHC that lasted more than two years. Here, we present the results of the extensive tests for the first long shutdown period of LHC, including the leak detection in the chambers (internal leak) or gas pipes and connectors (external leak), details on the new leak measurement, and the status of a leak repair.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116792162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-22DOI: 10.1109/NSSMIC.2013.6829736
D. Damazio
The ATLAS detector operated successfully at the LHC studying the proton-proton collisions produced with a center-of-mass of energy up to 8 TeV. During the period from 2009 to 2012, called the LHC Run 1, up to more than 37 independent collisions were produced every 50 ns at the LHC. The ATLAS detector has a set of calorimeters measuring the energy of different types of particles. The liquid argon calorimeters work by ionization of their active material and the free electrons are collected by electrodes at high voltages. Multiple samples of the analog signal are registered and digital signal processing techniques are used to extract its amplitude which is related to the energy deposited. The signal pulse is relatively long (up to 400 ns) and the probability of other physics events happening in the same detector area during that interval is high. A technique called Optimal Filter is used to minimize the effects of such pile-up. In the next data taking period, the luminosity will be higher and new techniques are being considered to mitigate the impact of the pile-up induced noise. Such techniques are also being envisaged for usage in the ATLAS trigger. This paper will discuss these techniques and their implementation in the ATCA standard electronics. A prototype using the processing power of FPGAs is being prepared for studies and planned to be used when the LHC returns to operation in 2015.
{"title":"Signal processing for the ATLAS liquid argon calorimeter: Studies and implementation","authors":"D. Damazio","doi":"10.1109/NSSMIC.2013.6829736","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829736","url":null,"abstract":"The ATLAS detector operated successfully at the LHC studying the proton-proton collisions produced with a center-of-mass of energy up to 8 TeV. During the period from 2009 to 2012, called the LHC Run 1, up to more than 37 independent collisions were produced every 50 ns at the LHC. The ATLAS detector has a set of calorimeters measuring the energy of different types of particles. The liquid argon calorimeters work by ionization of their active material and the free electrons are collected by electrodes at high voltages. Multiple samples of the analog signal are registered and digital signal processing techniques are used to extract its amplitude which is related to the energy deposited. The signal pulse is relatively long (up to 400 ns) and the probability of other physics events happening in the same detector area during that interval is high. A technique called Optimal Filter is used to minimize the effects of such pile-up. In the next data taking period, the luminosity will be higher and new techniques are being considered to mitigate the impact of the pile-up induced noise. Such techniques are also being envisaged for usage in the ATLAS trigger. This paper will discuss these techniques and their implementation in the ATCA standard electronics. A prototype using the processing power of FPGAs is being prepared for studies and planned to be used when the LHC returns to operation in 2015.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129062415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-22DOI: 10.1109/NSSMIC.2013.6829576
D. Damazio
The ATLAS detector operated very successfully at the LHC Run 1 data taking period collecting a large number of events used for different physics analyses, such as the ones leading to the discovery of the Higgs boson as well as for the search for beyond the Standard Model physics. In the main search channels related to the finding of the Higgs, the ATLAS calorimeter system played a major role by measuring the energy of photons, electrons, jets, taus and neutrinos, via missing transverse energy measurement. The ATLAS trigger system selects from the huge amount of events produced every second, those few that are recorded for physics analyses (less than one out of 40 thousand can be kept). The selection process is performed in three levels with increasing complexity and resolution. The first level is hardware based, seeding the two other software levels called together the HighLevel Trigger (HLT). The paper will describe details of the calorimeter based HLT algorithms with special emphasis on the algorithms used for missing transverse energy reconstruction and jet detection performance which was improved in 2012 with respect to the 2011 data taking despite the higher luminosity levels.
{"title":"Performance of the ATLAS calorimeter trigger in the LHC Run 1 data taking period","authors":"D. Damazio","doi":"10.1109/NSSMIC.2013.6829576","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829576","url":null,"abstract":"The ATLAS detector operated very successfully at the LHC Run 1 data taking period collecting a large number of events used for different physics analyses, such as the ones leading to the discovery of the Higgs boson as well as for the search for beyond the Standard Model physics. In the main search channels related to the finding of the Higgs, the ATLAS calorimeter system played a major role by measuring the energy of photons, electrons, jets, taus and neutrinos, via missing transverse energy measurement. The ATLAS trigger system selects from the huge amount of events produced every second, those few that are recorded for physics analyses (less than one out of 40 thousand can be kept). The selection process is performed in three levels with increasing complexity and resolution. The first level is hardware based, seeding the two other software levels called together the HighLevel Trigger (HLT). The paper will describe details of the calorimeter based HLT algorithms with special emphasis on the algorithms used for missing transverse energy reconstruction and jet detection performance which was improved in 2012 with respect to the 2011 data taking despite the higher luminosity levels.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121260136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-21DOI: 10.1109/NSSMIC.2013.6829812
M. Kim
The Resistive Plate Chambers are used in CMS as dedicated muon trigger detector both in the barrel and in the two endcap regions. They also contribute to muon reconstruction and identification with Drift Tube in the barrel and Cathode Strip Chambers in the endcaps. About 3000 square meter of double gap RPCs have been produced and installed in the experiment since 2007. The performance study and operational experience after three years of successful data taking at LHC is presented. Preliminary estimate of efficiency improvement of muon identification by the upgrade for the next two years is also shown.
{"title":"Role of the RPC detector in the CMS muon system for tracking and trigger","authors":"M. Kim","doi":"10.1109/NSSMIC.2013.6829812","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829812","url":null,"abstract":"The Resistive Plate Chambers are used in CMS as dedicated muon trigger detector both in the barrel and in the two endcap regions. They also contribute to muon reconstruction and identification with Drift Tube in the barrel and Cathode Strip Chambers in the endcaps. About 3000 square meter of double gap RPCs have been produced and installed in the experiment since 2007. The performance study and operational experience after three years of successful data taking at LHC is presented. Preliminary estimate of efficiency improvement of muon identification by the upgrade for the next two years is also shown.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127168994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-21DOI: 10.1109/NSSMIC.2013.6829591
M. Kole, Y. Fukazawa, K. Fukuda, S. Ishizu, M. Jackson, T. Kamae, N. Kawaguchi, T. Kawano, M. Kiss, E. Moretti, M. Salinas, M. Pearce, S. Rydstrom, H. Takahashi, T. Yanagida
PoGOLino is a scintillator-based neutron detector. Its main purpose is to provide data on the neutron flux in the upper stratosphere at high latitudes at thermal and non-thermal energies for the PoGOLite instrument. PoGOLite is a balloon borne hard X-ray polarimeter for which the main source of background stems from high energy neutrons. No measurements of the neutron environment for the planned flight latitude and altitude exist. Furthermore this neutron environment changes with altitude, latitude and solar activity, three variables that will vary throughout the PoGOLite flight. PoGOLino was developed to study the neutron environment and the influences from these three variables upon it. PoGOLino consists of two Europium doped Lithium Calcium Aluminium Fluoride (Eu:LiCAF) scintillators, each of which is sandwiched between 2 Bismuth Germanium Oxide (BGO) scintillating crystals, which serve to veto signals produced by gamma-rays and charged particles. This allows the neutron flux to be measured even in high radiation environments. Measurements of neutrons in two separate energy bands are achieved by placing one LiCAF detector inside a moderating polyethylene shield while the second detector remains unshielded. The PoGOLino instrument was launched on March 20th 2013 from the Esrange Space Center in Northern Sweden to an altitude of 30.9 km. A description of the detector design and read-out system is presented. A detailed set of simulations of the atmospheric neutron environment performed using both PLANETOCOSMICS and Geant4 will also be described. The comparison of the neutron flux measured during flight to predictions based on these simulations will be presented and the consequences for the PoGOLite background will be discussed.
{"title":"A balloon-borne measurement of high latitude atmospheric neutrons using a licaf neutron detector","authors":"M. Kole, Y. Fukazawa, K. Fukuda, S. Ishizu, M. Jackson, T. Kamae, N. Kawaguchi, T. Kawano, M. Kiss, E. Moretti, M. Salinas, M. Pearce, S. Rydstrom, H. Takahashi, T. Yanagida","doi":"10.1109/NSSMIC.2013.6829591","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829591","url":null,"abstract":"PoGOLino is a scintillator-based neutron detector. Its main purpose is to provide data on the neutron flux in the upper stratosphere at high latitudes at thermal and non-thermal energies for the PoGOLite instrument. PoGOLite is a balloon borne hard X-ray polarimeter for which the main source of background stems from high energy neutrons. No measurements of the neutron environment for the planned flight latitude and altitude exist. Furthermore this neutron environment changes with altitude, latitude and solar activity, three variables that will vary throughout the PoGOLite flight. PoGOLino was developed to study the neutron environment and the influences from these three variables upon it. PoGOLino consists of two Europium doped Lithium Calcium Aluminium Fluoride (Eu:LiCAF) scintillators, each of which is sandwiched between 2 Bismuth Germanium Oxide (BGO) scintillating crystals, which serve to veto signals produced by gamma-rays and charged particles. This allows the neutron flux to be measured even in high radiation environments. Measurements of neutrons in two separate energy bands are achieved by placing one LiCAF detector inside a moderating polyethylene shield while the second detector remains unshielded. The PoGOLino instrument was launched on March 20th 2013 from the Esrange Space Center in Northern Sweden to an altitude of 30.9 km. A description of the detector design and read-out system is presented. A detailed set of simulations of the atmospheric neutron environment performed using both PLANETOCOSMICS and Geant4 will also be described. The comparison of the neutron flux measured during flight to predictions based on these simulations will be presented and the consequences for the PoGOLite background will be discussed.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124086195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-20DOI: 10.1109/NSSMIC.2013.6829565
A. Pfeiffer, M. Pia
A software package has been developed to bridge the R analysis model with the conceptual analysis environment typical of radiation physics experiments. The new package has been used in the context of a project for the validation of simulation models, where it has demonstrated its capability to satisfy typical requirements pertinent to the problem domain.
{"title":"Data analysis with R in an experimental physics environment","authors":"A. Pfeiffer, M. Pia","doi":"10.1109/NSSMIC.2013.6829565","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829565","url":null,"abstract":"A software package has been developed to bridge the R analysis model with the conceptual analysis environment typical of radiation physics experiments. The new package has been used in the context of a project for the validation of simulation models, where it has demonstrated its capability to satisfy typical requirements pertinent to the problem domain.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134646874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-11-15DOI: 10.1109/NSSMIC.2013.6829570
V. Grassi
The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Liquid argon sampling calorimeters are used for the identification and characteristics measurement of the electrons, photons and hadronic jets. Since the first collisions in 2010, the calorimeters operated almost optimally, playing a leading role in the discovery of the Higgs boson announced in July 2012. A special emphasis in this paper will be given on the latest developments of the high voltage power supply system. These efforts allowed to equip the calorimeters with innovative power supply modules able to temporarily sustain high current load without major voltage drop.
{"title":"The Atlas liquid argon calorimeter at the CERN Large Hadron Collider: General performance and latest developments of the High Voltage system","authors":"V. Grassi","doi":"10.1109/NSSMIC.2013.6829570","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829570","url":null,"abstract":"The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Liquid argon sampling calorimeters are used for the identification and characteristics measurement of the electrons, photons and hadronic jets. Since the first collisions in 2010, the calorimeters operated almost optimally, playing a leading role in the discovery of the Higgs boson announced in July 2012. A special emphasis in this paper will be given on the latest developments of the high voltage power supply system. These efforts allowed to equip the calorimeters with innovative power supply modules able to temporarily sustain high current load without major voltage drop.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124671850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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