Novel real-time alignment and calibration of LHCb detector for Run II and tracking for the upgrade.

17th International Workshop on Advanced Computing and Analysis Techniques in Physics Research

物理学;计算机科学

Quagliani, Renato^1,2

Laboratoire de l'Accelerateur Lineare, Orsay, France^1

Bristol University, Bristol, United Kingdom^2

关键词: Calibration constants;    Collision rate;    Online selection;    Performance stability;    Running conditions;    Timing constraints;    Track reconstruction;    Tracking system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/762/1/012046/pdf
DOI  :  10.1088/1742-6596/762/1/012046

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

LHCb has introduced a novel real-time detector alignment and calibration strategy for LHC Run II. Data collected at the start of the fill is processed in a few minutes and used to update the alignment, while the calibration constants are evaluated for each run. The procedure aims to improve the quality of the online selection and performance stability. The required computing time constraints are met thanks to a new dedicated framework using the multi-core farm infrastructure for the trigger. A similar scheme is planned to be used for Run III foreseen to start in 2020. At that time LHCb will run at an instantaneous luminosity of 2 x 1033cm-2s-1and a fully software based trigger strategy will be used. The new running conditions and the tighter timing constraints in the software trigger (only 13 ms per event are available) represent a big challenge for track reconstruction. The new software based trigger strategy implies a full detector read-out at the collision rate of 40 MHz. High performance and timing constraints are ensured by a new tracking system and a fast and efficient track reconstruction strategy.