The First HCAL absorber plate produced at the University of Sofia in 1997. Later, the Sofia-CMS team produced 700 tonnes of the HCAL barrel absorber.
Inside the blue box is the first prototype of the HCAL installed for tests at the H4 beam line (around 1994).
The Sofia-CMS laboratory with the cosmic test stand at which RB3 (barrel RPC, station 3) chambers were assembled and tested with cosmic muons (2002)
The University of Sofia team involved in assembly of the CMS RPC muon system (2005)
The University of Sofia “St. Kliment Ohridski” is the oldest and the biggest university in Bulgaria. A group of researchers from the Faculty of Physics has participated in the CMS project since 1991. Bulgarian physicists were responsible for the Hadron Calorimeter System’s computer simulations, design, production of prototypes and their tests at the SPS beams. They took part in the HCAL calibration and development of methods for energy reconstruction. The absorber plates of the barrel HCAL were produced in Bulgaria. The Sofia-CMS team has a significant contribution in the design, production, installation and commissioning of the CMS RPC system as well. Currently, the main responsibilities of the group are connected with data taking, RPC system maintenance and running, Muon system upgrade, CMS computing and Physics analysis. A CMS Centre and Tier-3 cluster were established and are functioning at the University of Sofia.
About The University of Sofia
From: Bulgaria
CMS member since: 1992