Programme Director: Kenneth Österberg

NB: CMS embarks on data collection at 13 TeV

The Large Hadron Collider (LHC) started to operate in November 2009. Huge event rates make the computing in CMS experiment a tremendous challenge. Up to a thousand million proton-proton collisions, with hundreds of particles in each, take place every second. Electric signals from thousands of particles are processed parallel in millions of measurement channels with the rate of 40 MHz, i.e. once in every 25 ns.


  • CMS Experiment    Personnel
    The HIP physics analysis team takes active part in the CMS computing, software and analysis effort. The activities range from detector and physics simulation studies in view of exploring the CMS physics performance to the reconstruction and analysis of the events.
  • CMS Upgrade    Personnel
    The HIP CMS Upgrade Project is in charge of the Finnish participation in the CMS Tracker and its future upgrade. The Tracker is based on silicon sensors, and it is the largest silicon detector ever constructed. It is the innermost detector of the CMS (Compact Muon Solenoid) experiment, located just around the LHC (Large Hadron Collider) beam pipe.
  • CMS Forward Physics    Personnel
    The main focus of the CMS forward physics Project during 2023-25 will be the completion, full commissioning and operation of the time-of-flight (TOF) detector of the CMS Precision Proton Spectrometer (PPS) in LHC Run 3 (2022-25).
  • Tier-2 Operations    Personnel
    HIP supports the computing needs of the LHC experiments ALICE, CMS and TOTEM. ALICE computing resources in Finland are part of the distributed Nordic Data Grid Facility (NDGF) Tier-1 resource within the Nordic e-Infrastructure Collaboration (NeIC), while the CMS resources are of Tier-2 level using some services from NDGF. These Tier-1 and Tier-2 resources are part of the distributed Worldwide LHC Computing Grid, WLCG. The good performance of WLCG is an essential factor in all the physics analyses and publications.

Old Projects

  • TOTEM (2017-2022)
    The TOTEM experiment was conceived to cover elastic scattering, total cross section and diffraction dissociation at the LHC. It is understood that TOTEM constitutes the experiment of forward physics at the LHC. This experiment, together with the CMS, cover more phase space than any other detector installation at a large hadron collider.