-- AminaZghiche - 2019-03-20

CMS-DP-2019/005

CMS ECAL with Run2 data

Abstract: CMS ECAL Response to laser light with full Run1 and Run2 laser data.

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Figure Caption
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histories 2011-2012-2015-2016-2017-2018 190208.png
Relative response to laser light (440 nm in 2011 and 447 nm from 2012 onwards) injected in the ECAL crystals, measured by the ECAL laser monitoring system, averaged over all crystals in bins of pseudorapidity (η), for the 2011, 2012, 2015, 2016, 2017 and 2018 data taking periods, with magnetic field at 3.8 T. The response change observed in the ECAL channels is up to 13% in the barrel and it reaches up to 62% at η ~ 2.5, the limit of the tracker acceptance. The response change is up to 96% in the region closest to the beam pipe. The recovery of the crystal response during the periods without collisions is visible. These measurements, performed every 40 minutes, are used to correct the physics data. This is an update of the plots appearing in CMS-DP-2012/007, CMS-DP-2012/015, CMS-DP-2015/016, CMS-DP-2015/063, CMS-DP-2016/031, CMS-DP-2017/003, CMS-DP-2017/023, and CMS-DP-2018/015 and includes measurements taken up to December 2018. The bottom plot shows the instantaneous LHC luminosity delivered during this time period.

-- AminaZghiche - 2019-02-07

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