Identification of Pile-up Using the Quality Factor of Pulse Shapes in the ATLAS Tile Calorimeter
2011 (English)In: IEEE Nuclear Science Symposium Conference Record, ISSN 1082-3654, 1188-1193 p.Article in journal (Refereed) Published
The ATLAS experiment records data from the proton-proton collisions produced by the Large Hadron Col lider (LHC). The Tile Calorimeter is the hadronic sampling calorimeter of ATLAS in the region |η|<1.7. It uses iron absorbers and scintillators as active material. The LHC will provide collisions every 25 ns, putting very strong requirements on the energy measurement in presence of energy deposits from different collisions in the same read out window and physical calorimeter channel (pile-up). In 2011 the LHC is running with filled bunches at 50 ns spacing and at intensities which yield up to about 8 proton-proton collisions per bunch crossing. We present a quality factor that can be computed online for each collision and for each calorimeter channel within the 10 μs latency of the ATLAS first level trigger (L1 trigger), and could allow to identify calorimeter channels presenting pile-up. In presence of a poor quality factor the data from the corresponding channel is read out with additional information to allow for an offline dedicated treatment of the signals to account for pile-up.
Place, publisher, year, edition, pages
2011. 1188-1193 p.
Q-factor, energy measurement, nuclear electronics, particle beam bunching, particle calorimetry, position sensitive particle detectors, readout electronics, trigger circuits, ATLAS experiment, ATLAS first level trigger, ATLAS tile calorimeter, Large Hadron Collider, active material, bunch crossing, calorimeter channel, calorimeter channels energy deposits, energy measurement, hadronic sampling calorimeter, iron absorbers, physical calorimeter channel, proton+proton collisions, pulse shapes, quality factor, read out window
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-120008DOI: 10.1109/NSSMIC.2011.6154599OAI: oai:DiVA.org:su-120008DiVA: diva2:850097
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), Valencia, Spain, 23-29 October 2011