348 - ATLAS Computing

Guests: Frank Berghaus (berghaus.web.cern.ch/berghaus) Host: Markus Voelter Shownoter: Bastian Hundt

To conclude our detailed look at the ATLAS experiment, this episode looks at the computing infrastructure. We start out with the trigger systems that decide, very quickly, whether the data from a particular collision is worth keeping. We then discuss the reconstruction of the event, the simulation needed to understand the background as well as the LHC Grid (en.wikipedia.org/wiki/Worldwide_LHC_Computing_…) used distribute data and computation over the whole planet. Our guest is CERN’n Frank Berghaus (berghaus.web.cern.ch/berghaus).

Introduction of Frank Berghaus
00:03:45
Frank Berghaus (profiles.web.cern.ch/662325) | omega tau about the History of ATLAS (omegataupodcast.net/344-history-and-developmen…) | omega tau about Science at ATLAS (omegataupodcast.net/345-atlas-science) | en.wikipedia.org/wiki/CERN | The Atlas Experiment (en.wikipedia.org/wiki/ATLAS_experiment) | LHC (en.wikipedia.org/wiki/Large_Hadron_Collider)

Basic Structure of LHC/Atlas and the Computing Infrastructure
00:05:25
Particle Physics (en.wikipedia.org/wiki/Particle_physics) | Particle Accelerator (en.wikipedia.org/wiki/Particle_accelerator) | Particle Detector (en.wikipedia.org/wiki/Particle_detector) | en.wikipedia.org/wiki/Beamline | Magnetig Field (en.wikipedia.org/wiki/Magnetic_field) | en.wikipedia.org/wiki/Calorimeter | Atlas Calorimeter (atlas.cern/discover/detector/calorimeter) | en.wikipedia.org/wiki/Energy | en.wikipedia.org/wiki/Muon | Analog to Digital Converter (en.wikipedia.org/wiki/Analog-to-digital_conver…) | Particle Collision (en.wikipedia.org/wiki/Event_(particle_physics)) | Atlas-Trigger (atlas.cern/discover/detector/trigger-daq) | In-Memory-Cache (en.wikipedia.org/wiki/Cache_(computing)) | Resistive Plate Chambers (cms.web.cern.ch/news/resistive-plate-chambers) | Photomultiplier Tube (en.wikipedia.org/wiki/Photomultiplier_tube)

Terminology
00:17:05
Reconstruction / Reduction | Data Processing (en.wikipedia.org/wiki/Data_processing) | Online vs. Offline | Cern Datacenter (home.cern/science/computing/data-centre) | en.wikipedia.org/wiki/Bias

After Event-Trigger Data Processing
00:23:10
Electron Shower (en.wikipedia.org/wiki/Particle_shower) | Network Switch (en.wikipedia.org/wiki/Network_switch) | en.wikipedia.org/wiki/Cryostat | Round-Robin Schedueling (en.wikipedia.org/wiki/Round-robin_scheduling) | Distributed Storage (en.wikipedia.org/wiki/Clustered_file_system) | Event Horizon Telescope (en.wikipedia.org/wiki/Event_Horizon_Telescope)

Data Processing after Storage of Events
00:42:45
Particle Jets (en.wikipedia.org/wiki/Jet_(particle_physics)) | en.wikipedia.org/wiki/Momentum | en.wikipedia.org/wiki/Abstraction

Jet Reconstruction
00:51:25
Topological Clustering (en.wikipedia.org/wiki/Topological_data_analysis) | Cone Algorithm (en.wikipedia.org/wiki/Cone_algorithm)

Processing and Reprocessing / CERN Computing Infrastructure
01:03:55
en.wikipedia.org/wiki/Luminosity_(scattering_t…) | High Luminosity LHC (home.cern/science/accelerators/high-luminosity…) | Vertex Detector (desy.de/~garutti/LECTURES/ParticleDetectorSS12…)

LHC Computing Grid
01:12:40
Worldwide LHC Computing Grid (en.wikipedia.org/wiki/Worldwide_LHC_Computing_…)

Analysis of Events and Computing Infrastructure
01:24:05
en.wikipedia.org/wiki/Simulation | Field Theory (en.wikipedia.org/wiki/Field_(physics)#Field_theory) | Differential Equations (en.wikipedia.org/wiki/Differential_equation) | en.wikipedia.org/wiki/Photon | ROOT Particle Physics Software (en.wikipedia.org/wiki/ROOT) | Machine Learning (en.wikipedia.org/wiki/Machine_learning) | GPU (en.wikipedia.org/wiki/Graphics_processing_unit) | en.wikipedia.org/wiki/Multithreading_(computer…) | en.wikipedia.org/wiki/Supercomputer

Data Organization and End
02:00:25
Relational Database (en.wikipedia.org/wiki/Relational_database) | en.wikipedia.org/wiki/Namespace | Tape Storage (en.wikipedia.org/wiki/Magnetic_tape_data_storage) | Cloud Computing (en.wikipedia.org/wiki/Cloud_computing) | Distributed Computing (en.wikipedia.org/wiki/Distributed_computing) | Standard Model (en.wikipedia.org/wiki/Standard_Model)

CERN File System
02:18:45
CVMFS (cernvm.cern.ch/portal/filesystem) | en.wikipedia.org/wiki/Docker_(software)