Data Preparation for NA62 Laycock, Paul
EPJ Web of Conferences,
2019, Volume:
214
Journal Article, Conference Proceeding
Peer reviewed
Open access
In 2017, NA62 recorded over a petabyte of raw data, collecting around a billion events per day of running. Data are collected in bursts of 3-5 seconds, producing output files of a few gigabytes. A ...typical run, a sequence of bursts with the same detector configuration and similar experimental conditions, contains 1500 bursts and constitutes the basic unit for offline data processing. A sample of 100 random bursts is used to make timing calibrations of all detectors, after which every burst in the run is reconstructed. Finally the reconstructed events are filtered by physics channel with an average reduction factor of 20, and data quality metrics are calculated.
Initially a bespoke data processing solution was implemented using a simple finite state machine with limited production system functionality. In 2017, the ATLAS Tier-0 team offered the use of their production system, together with the necessary support. Data processing workflows were rewritten with better error-handling and I/O operations were minimised, the reconstruction software was improved and conditions data handling was changed to follow best practices suggested by the HEP Software Foundation conditions database working group. This contribution describes the experience gained in using these tools and methods for data-processing on a petabyte scale experiment.
Prospects for observation at CERN in NA62 Hahn, F; Aliberti, R; Ambrosino, F ...
Journal of physics. Conference series,
07/2015, Volume:
631, Issue:
1
Journal Article
Peer reviewed
Open access
The rare decays are excellent processes to probe the Standard Model and indirectly search for new physics complementary to the direct LHC searches. The NA62 experiment at CERN SPS aims to collect and ...analyse O(1013) kaon decays before the CERN long-shutdown 2 (in 2018). This will allow to measure the branching ratio to a level of 10% accuracy. The experimental apparatus has been commissioned during a first run in autumn 2014.
$K^{+}\rightarrow\pi^{+}\nu\overline{\nu}$ is one of the theoretically
cleanest meson decay where to look for indirect effects of new physics
complementary to LHC searches. The NA62 experiment at ...CERN SPS is designed to
measure the branching ratio of this decay with 10\% precision. NA62 took data
in pilot runs in 2014 and 2015 reaching the final designed beam intensity. The
quality of 2015 data acquired, in view of the final measurement, will be
presented.
Deleterious effects of ionizing radiation and some chemotherapeutic agents are predominantly caused by reactive oxygen agents which are detoxified by antioxidants. This study was designed to evaluate ...the modifying effects of vitamin A-, vitamin E- and selenium serum concentrations and glutathione peroxidase activity on preoperative radio- and chemotherapy of breast cancer.
Tumor volume, vitamin A-, vitamin E-, selenium serum concentrations and glutathione peroxidase activity in circulating erythrocytes were determined in 40 patients with breast cancer before treatment. Interstitial radiohyperthermia was given initially using a single dose of 10 Gy (HDR) combined with hyperthermia between 43.5 to 44.5 degrees C over 60 minutes followed by external beam radiotherapy with 50 Gy in 5 weeks. All patients received anthracyline or anthrachinone containing chemotherapy. Tumor response was determined by histopathological examination. Patients with complete and incomplete remissions were compared using the Wilcoxon test. Pre- and posttreatment tumor-volume differences were correlated with antioxidant concentrations (Spearman correlation coefficient).
Twenty patients (50%) achieved a complete histopathologic tumor regression. This high complete remission rate was not related to the antioxidants under investigation (vitamin A: p = 0.32, vitamin E: p = 0.44, selenium: p = 0.68, glutathione peroxidase: p = 0.3). There was no correlation to pre- and posttreatment tumor-volume-differences either (vitamin A: p = 0.89, vitamin E: p = 0.67, selenium: p = 0.41, glutathione peroxidase: p = 0.87).
In this study serum concentrations of antioxidants had no modifying influence on tumor response in breast cancer patients following induction radio-chemotherapy and subsequent surgery. Further studies measuring tissue levels could clarify if there is any modifying influence of antioxidants on tumor remission.
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