@@ -15,7 +15,7 @@ A brief description of the CMS Computing operations during LHC RunII and their r
\section{Introduction}
The CMS Experiment \cite{CMS-descr} at CERN collects and analyses data from the pp collisions in the LHC Collider.
The first physics Run, at centre of mass energy of 7-8 TeV, started in late March 2010, and ended in February 2013; more than 25~fb$^{-1}$ of collisions were collected during the Run. RunII, at 13 TeV, started in 2015, and finished at the end of 2018.
The first physics Run, at center of mass energy of 7-8 TeV, started in late March 2010, and ended in February 2013; more than 25~fb$^{-1}$ of collisions were collected during the Run. RunII, at 13 TeV, started in 2015, and finished at the end of 2018.
During the first two years of RunII, LHC has been able to largely exceed its design parameters: already in 2016 instantaneous luminosity reached $1.5\times10^{34}\mathrm{cm^{-2}s^{-1}}$, 50\% more than the planned “high luminosity” LHC phase. The most astonishing achievement, still, is a huge improvement on the fraction of time LHC can serve physics collision, increased form ~35\% of RunI to more than 80\% in some months on 2016.
The most visible effect, computing wise, is a large increase of data to be stored, processed and analysed offline, with 2016 allowing for the collection of more than 40 fb$^{-1}$ of physics data.
