Catania
The JLAB12 group of the INFN / Catania Section is formed by four researchers,a mechanical engineer and several technicians and relies on the significant contribution of the Advanced Technologies Service and Electronics Service of CT/ Section, which have greatly contributed to the design and construction of GEM detectors ( size 50 x 40 cm 2) for the new SBS tracker of the Hall A Collaboration, work taken over by the JLAB12 group of INFN/CT. Both the structure and services of triple GEM chambers mechanical design and the accommodation and arrangement of a dedicated area of the clean room of Section, for the tests of the chambers during the various phases of construction, were completed. For this purpose, a special TENDIGEM has been built in order to put under tension, properly controlled , the GEM foils and prepare them for the bonding.The work continued with the design and construction of ” frames” and different other components of the detector, furthermore CERN GEM foils electrical test and bonding of different triple GEM chamber parts were performed. Moreover we are preparing a triple-GEM chambers test system by using sources and cosmic rays. At present two triple GEM detectors were completed and tested by using an electron beam with an energy from 2 to 6 GeV, in the period April 22 – May 6 2013, at DESY (Hamburg), Germany.