CERN large hadron collider compact muon solenoid hadronic calorimeter upgrade works

The Large Hadron Collider (LHC) and its detectors have become the most discussed scientific device around the world with its discoveries. Starting from 2000s, LHC project became real in March 2010, the first successful collision. Just in 2 years, LHC discovered Higgs boson on July 4, 2012. LHC houses 4 big experiments, Compact Muon Solenoid (CMS), A Toroidal Large Hadron Collider ApparatuS (ATLAS), A Large Ion Collider Experiment (ALICE) and Large Hadron Collider beauty (LHCb). CMS is the heaviest and one of general purpose detector of LHC. CMS has hadronic calorimeter (HCAL) to measure and identify hadrons. HCAL consists of hadronic barrel (HB), hadronic outer (HO), hadronic endcap (HE) and hadronic forward (HF) calorimeters. Material of these detectors will be damaged due to increasing integrated radiation for high luminosity of LHC. For that reason, material of subsystems needs to be replaced by stronger ones. For example, hadronic endcap scintillators will be highly damaged by luminosity of High Luminosity Large Hadron Collider (HL-LHC), new phase of LHC starting from 2023. For replacement, 4 different institutes have proposed new scintillators. Irradiation test of these scintillators were done with a dark box, silicon photomultiplier (SiPM) and a readout system in 2015. Measurements were taken in March, June, September and December 2015. In order to understand how much these scintillators will be damaged by radiation, installation box of scintillators were irradiated by installing few cm close to the beam pipe inside the CMS detector –to Centauro And Strange Object Research (CASTOR) table. After taking derivatives of measurement data under different conditions, breakdown voltage (BDV) of SiPMs were calculated in ROOT software package. Adding a specific voltage to BDV, currents were compared to observe radiation damage in scintillators. Due to systematical and statistical errors in previous measurements setup new measurements will be taken via HCAL data acquisition (DAQ) system for reliable results. Work are still continue as of April 2016. In long shutdown 1 (LS1) photomultiplier tubes (PMT) of HF calorimeters were replaced by new ones. To calibrate new PMTs, sourcing data were taken with Co-60 radioactive source, and analysis were done in CMSSW. Applying several corrections and conversions, calibration coefficients of individual PMTs were calculated. New source data were taken in 2016 and analysis of new data were scheduled later this year. Alongside these tasks, there are several ongoing tasks such as HF radiation damage monitoring and online software development. HF-fiber radiation damage monitoring involves local radiation damage data in CMMSW and monitor radiation damage in time. Online software includes developing and upgrading new generation readout box manager (ngRBXManager). This software will operate to take data from readout boxes via new generation clock control module (ngCCM).