L-R: C. Angelov and V. Genchev preparing RPC chambers for testing at the Institute in Sofia
Bulgarian group testing the RPC chambers at CERN: From left to right: P. Iaydjiev, M. Shopova, M. Rodozov
The first group of Bulgarian technicians, installing cables at the CMS wheels
CMS delegation at the fortieth anniversary of INRNE. From left to right: G. Iaselli, J. Virdee, V. Genchev, I. Golutvin (2012)
Initially, Bulgarian specialists were involved in the development of the CMS Hadron and Electromagnetic Calorimeters (HCAL and ECAL respectively), simulating the processes in different detector configurations. Later many efforts were put into the preproduction of about 700 tonnes of brass plates for the HCAL. In 1994, the “Russia and Dubna Member States (RDMS)” collaboration was formed, including many Russian institutes and the member-states of the Joint Institutes of Nuclear Research at Dubna. In the framework of RDMS, the INRNE Laboratory of Nuclear Electronics, led by I. Vankov and L. Dimitrov (with the support of Fermilab, USA) started a big project – the development and production of a ~500-channel computer-controlled high-voltage system for the photodetectors of HCAL. This system (including 22 Euro-crates) was produced and tested at INRNE and then installed in the CMS cavern at CERN, where it continues operating until today.
Similarly, a second computer-controlled high-voltage system, supplying 1728 photo-multipliers of the CMS forward calorimeter was developed and produced by INRNE and then installed at CMS.
About Institute for Nuclear Research and Nuclear Energy (INRNE)
From: Bulgaria
CMS member since: 1992
Website: http://www.inrne.bas.bg