GRID (S. González, A. Fernández, V. Lara, S. Martí, F. Martínez, E. Ros, J. Salt, J. Sánchez S....
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GRID (S. González, A. Fernández, V. Lara, S. Martí, F. Martínez, E. Ros, J. Salt, J. SánchezS. Projects DATAGRID (EU-IST) 2001-2004. The objective of the Data Grid project is to enable next generation scientific exploration which requiresintensive computation and analysis of shared large-scale databases, from hundreds of TeraBytes to PetaBytes, across widely distributed scientific communities. CROSSGRID (EU-IST) 2002-2005. It is the goal of the project to explore, incorporate, adapt and validate Grid technology for those application areas that require interactive access to resources, be they Databases, Super Computers, Visualisation Engines, Medical Scanners, or environmental data input devices. LCG-ES (MCyT) 2002-2005. The gaol is initial development and exploitation of DataGrid infrastructure in Spain, driven by the requirements of the integration and comissioning phase of the LHC experiments, but also capable of supporting data analysis of ongoing physics experiments. Resources Next generation experiments in HEP will require unprecedented computing resources for physics analysis. The aim is to develop final user applications for physics analysis running in a distributed mode (Grid services will be validated and tested thoroughly on the testbed), using large distributed databases. Testbed Grid CrossGrid international distributed testb will share resources across fifteen Europ sites, to run interactive applications. N academic network providers and the high-performance European network, Geant, will assure the interconnectivity of all The figure shows the geographical map for the different nodes, including the ma network links. http://ific.uv.es/grid ATLAS ACTIVITIES @ VALENCIA J. E. García, S. González, J. Bernabéu, J. V. Civera, M. J. Costa, J. Fuster, C. García, F. González, C. Lacasta, G. Llosá, S. Martí, P. Modesto, A. Oyanguren, R. Rodriguez, E. Ros, J. Salt, F. J. Sánchez, V. Strachko, L. Sospedra, M. Vos. The Inner Detector is a sub- detector of the ATLAS experiment. It will provide a very precise tracking and vertex determination. The Semiconductor Tracker is a part of the tracking system based upon silicon microstrip detector technology. The SCT will be composed by a Barrel and Forward sectors. Four different types of modules are employed in the SCT (1 for the IFIC SCT group is involved in the Atlas Forward Silicon Tracker construction. 220 modules with 4 detectors each and its corresponding read out electronics have to be assembled and tested. All the different procedures in the Forwad modules assembly and tests are performed in a (class 10.000 and 1.000) 80 m 2 cleanroom with continous temperature and humidity control. Wafers Characterization Wafers Characterization A total of 880 silicon wafers have been fully characterized. This is equivalent to 3.2 m 2 of microstrip silicon detectors. For each wafer the leakage current and depletion voltage have been measured and compared with the SCT specifications. More exhaustive tests are perfomed on a subset of detectors. An automatic measurement system has been developed in order to verify the correct assembly of SCT modules. The device uses a combination of two cameras with high magnification optics and a laser interferometer provide accurate measures of the position with a precision of 0.2 m. Metrology System Metrology System All the components need to be assembled together with high precision, being the alignment tolerances of few microns. An assembly system has been built in Valencia in order to achieve the mechanical precisions . Assembly System Assembly System Through a wire- bonding technique, each strip on the detector is ultrasonically stitched to its corresponding amplifier on a readout chip with an aluminum wire of 17-24 m of diameter. Bonding Bonding A full assembled module must pass several quality assurance (QA) tests. The aim of the QA procedures is to ensure that each SCT forward module fulfills all required specifications Quality Assurance Quality Assurance • Infrared thermal imaging can reveal hidden systematic problems like bonding failures or hybrid hot points. • The behaviour of the chips in Gain and Noise is one of the most important results of the electrical characterization. • The modules need to be tested under beam to probe its particle detection capability. Beam tests are performed at CERN and KEK regularly for this purpose. Detectors Hybrid Chips Fan-in Spine Forward outer module SemiConductor Tracker F.Camarena, J.M.Castelo,V.Castillo, C.Cuenca, F.Fassi, A.Ferrer, E.Fullana, E.Higón, B.Salvachúa TILE CALORIMETER -The 32 RODs calculate energy, time and quality information of the more than 10.000 channels of the calorimeter at level 1 rate (100KHz) providing an output rate of 2.5 Gb/s via a S-link protocol. -High Tech electronics (DSPs and FPGAs) will be implemented in the cards -Optimal Filtering Algorithm will be programmed inside DSPs to reconstruct energy and time while minimizing noise. -1750 (17%) of the Tilecal photomultipliers are tested in Valencia laboratory in a test bench labview based environment. Having the responsibility of the acceptation/rejection decision for the final ATLAS assembly. -Two LEDs (continuous and pulsed) simulate as close as possible Tilecal light conditions. -16 photomultipliers (1%) were rejected -Tilecal calorimeter is a large hadronic sampling calorimeter which makes use of iron as absorber material and scintillating tiles, placed in planes perpendicular to the colliding beam. -315 iron submodules (900 kg each), half extended barrel, were assembled at Valencia. (In green). Standa rd noise Noise reduct ion with OF High P High P T Top Mass Measurement in Single Lepton + Top Mass Measurement in Single Lepton + Jets Channel Jets Channel Using a Large Calorimeter Cluster Using a Large Calorimeter Cluster F. Fassi , I. Efthymiopoulos, V. Castillo, E. Higón Expected strong dependence of mt with the cluster size because of the Underlying Event (UE) contribution. After UE subtraction inv. mass independent of cone size, but lower value: <159.10.11 GeV>. To re-scale mt to top mass, The two jets from W decay in inclusive top sample have been used. The resulting re-scaled top mass is: <175.860.12 GeV>. SUBMODULES CONSTRUCTION PHOTOMULTIPLIERST ETBENCH Read Out Driver (ROD) Physics and detector simulation S. González, E. Ros, M. Vos The potential of the ATLAS detector for the discovery of signatures of physics beyond the Standard Model is evaluated in detailed Monte Carlo studies of new physics processes and the detector response. •The flavour tagging performance of the ATLAS detector is determined using GEANT simulations of the full detector. GRID test bed computing power is used during the siulation and reconstruction phase. •Discovery regions are determined for the muon decay channel of the two lightest MSSM Higgs bosons. Significance after 3 years @low luminosity Top mass (mt) is a fundamental Standard Model (SM) input parameter. It is present in the radiative corrections which connet several other SM parameters. An accurate knowledge of the top mass can put constraints on the Higgs mass. The large production rate at LHC allows the possibility to use special sub-sample of the tt events. Such a sub-sample is the high Pt (>200 GeV) top sample. Due to the high P T , the three jets (jjb) from hadronic top decay are very close in space. To exploit this particular topology, mt is directly reconstructed from the calorimeter towers ( =0.10.1) around the top quark direction.
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Transcript of GRID (S. González, A. Fernández, V. Lara, S. Martí, F. Martínez, E. Ros, J. Salt, J. Sánchez S....
GRID(S. González, A. Fernández, V. Lara, S. Martí, F. Martínez, E. Ros, J. Salt, J. SánchezS. )
Projects
DATAGRID (EU-IST) 2001-2004. The objective of the Data Grid project is to enable next generation scientific exploration which requiresintensive computation and analysis of shared large-scale databases, from hundreds of TeraBytes to PetaBytes, across widely distributed scientific communities. CROSSGRID (EU-IST) 2002-2005. It isthe goal of the project to explore, incorporate, adapt and validate Grid technology for those application areas that require interactiveaccess to resources, be they Databases, Super Computers, Visualisation Engines, Medical Scanners,or environmental data input devices.LCG-ES (MCyT) 2002-2005. The gaol is initial development and exploitation of DataGrid infrastructure in Spain, driven by the requirements of the integration andcomissioning phase of the LHC experiments, but also capable of supporting dataanalysis of ongoing physics experiments.
Resources
Next generation experiments in HEP will require unprecedented computing resourcesfor physics analysis. The aim is to developfinal user applications for physics analysisrunning in a distributed mode (Grid serviceswill be validated and tested thoroughly on the testbed), using large distributed databases.
Testbed Grid
CrossGrid international distributed testbedwill share resources across fifteen Europeansites, to run interactive applications. Nationalacademic network providers and the high-performance European network, Geant,will assure the interconnectivity of all sites.The figure shows the geographical mapfor the different nodes, including the major network links.
http://ific.uv.es/grid
ATLAS ACTIVITIES @ VALENCIA
J. E. García, S. González, J. Bernabéu, J. V. Civera, M. J. Costa, J. Fuster, C. García, F. González, C. Lacasta, G. Llosá, S. Martí, P. Modesto, A. Oyanguren, R. Rodriguez, E. Ros, J. Salt, F. J. Sánchez, V. Strachko, L. Sospedra, M. Vos.
The Inner Detector is a sub-detector of the ATLAS experiment. It will provide a very precise tracking and vertex determination. The Semiconductor Tracker is a part of the tracking system based upon silicon microstrip detector technology. The SCT will be composed by a Barrel and Forward sectors. Four different types of modules are employed in the SCT (1 for the Barrel sector and 3 for the Forward).
IFIC SCT group is involved in the Atlas Forward Silicon Tracker construction. 220 modules with 4 detectors each and its corresponding read out electronics have to be assembled and tested. All the different procedures in the Forwad modules assembly and tests are performed in a (class 10.000 and 1.000) 80 m2 cleanroom with continous temperature and humidity control.
Wafers CharacterizationWafers Characterization
A total of 880 silicon wafers have been fully characterized. This is equivalent to 3.2 m2 of microstrip silicon detectors. For each wafer the leakage current and depletion voltage have been measured and compared with the SCT specifications. More exhaustive tests are perfomed on a subset of detectors.
An automatic measurement system has been developed in order to verify the correct assembly of SCT modules. The device uses a combination of two cameras with high magnification optics and a laser interferometer provide accurate measures of the position with a precision of 0.2 m.
Metrology SystemMetrology System
All the components need to be assembled together with high precision, being the alignment tolerances of few microns.
An assembly system has been built in Valencia in order to achieve the mechanical precisions.
Assembly SystemAssembly System
Through a wire-bonding technique, each strip on the detector is ultrasonically stitched to its corresponding amplifier on a readout chip with an aluminum wire of 17-24 m of diameter.
BondingBonding
A full assembled module must pass several quality assurance (QA) tests. The aim of the QA procedures is to ensure that each SCT forward module fulfills all required specifications
Quality AssuranceQuality Assurance
• Infrared thermal imaging can reveal hidden systematic problems like bonding failures or hybrid hot points.
• The behaviour of the chips in Gain and Noise is one of the most important results of the electrical characterization.
• The modules need to be tested under beam to probe its particle detection capability. Beam tests are performed at CERN and KEK regularly for this purpose.
DetectorsHybrid
Chips
Fan-in Spine
Forward outer module
SemiConductor Tracker
F.Camarena, J.M.Castelo,V.Castillo, C.Cuenca, F.Fassi, A.Ferrer, E.Fullana, E.Higón, B.Salvachúa
TILE CALORIMETER
-The 32 RODs calculate energy, time and quality information of the more than
10.000 channels of the calorimeter at level 1 rate (100KHz) providing an output rate
of 2.5 Gb/s via a S-link protocol.
-High Tech electronics (DSPs and FPGAs) will be implemented in the cards
-Optimal Filtering Algorithm will be programmed inside DSPs to reconstruct energy and time while minimizing noise.
-1750 (17%) of the Tilecal photomultipliers are tested in Valencia
laboratory in a test bench labview based environment. Having the responsibility of the acceptation/rejection decision for
the final ATLAS assembly.
-Two LEDs (continuous and pulsed) simulate as close as possible Tilecal light
conditions.
-16 photomultipliers (1%) were rejected
-Tilecal calorimeter is a large hadronic sampling calorimeter which makes use of iron as absorber material and scintillating tiles, placed in planes perpendicular to the colliding beam.
-315 iron submodules (900 kg each), half extended barrel, were assembled at Valencia. (In green).
Standard noise
Noise reduction with OF
High PHigh PTT Top Mass Measurement in Single Lepton + Jets Channel Top Mass Measurement in Single Lepton + Jets ChannelUsing a Large Calorimeter ClusterUsing a Large Calorimeter Cluster
F. Fassi, I. Efthymiopoulos, V. Castillo, E. Higón
Expected strong dependence of mt with the cluster size because of the Underlying Event (UE) contribution. After UE subtraction inv. mass independent of cone size, but lower value: <159.10.11 GeV>. To re-scale mt to top mass, The two jets from W decay in inclusive top sample have been used. The resulting re-scaled top mass is: <175.860.12 GeV>.
SUBMODULES CONSTRUCTION
PHOTOMULTIPLIERSTETBENCH
Read Out Driver (ROD)
Physics and detector simulationS. González, E. Ros, M. Vos
The potential of the ATLAS detector for the discovery of signatures of physics beyond the Standard Model is evaluated in detailed Monte Carlo studies of new physics processes and the detector response.
•The flavour tagging performance of the ATLAS detector is determined using GEANT simulations of the full detector. GRID test bed computing power is used during the siulation and reconstruction phase.
•Discovery regions are determined for the muon decay channel of the two lightest MSSM Higgs bosons.
Significance after 3 years @low luminosity
Top mass (mt) is a fundamental Standard Model (SM) input parameter. It is present in the radiative corrections which connet several other SM parameters. An accurate knowledge of the top mass can put constraints on the Higgs mass. The large production rate at LHC allows the possibility to use special sub-sample of the tt events. Such a sub-sample is the high Pt (>200 GeV) top sample.
Due to the high PT, the three jets (jjb) from hadronic top decay are very close in space. To exploit this particular topology, mt is directly reconstructed from the calorimeter towers ( =0.10.1) around the top quark direction.
