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Gas detector are very light instrument used in high energy physics to measurethe particle properties: position and momentum. Through high electric field ispossible to use the Gas Electron Multiplier (GEM) technology to detect theparticles and to exploit the its properties to construct a large area detector,such as the new IT for BESIII. The state of the art in the GEM production allowto create very large area GEM foils (up to 50x100 cm2) and thanks to the smallthickness of these foil is it possible to shape it to the desired form: aCylindrical Gas Electron Multiplier (CGEM) is then proposed. The innovativeconstruction technique based on Rohacell, a PMI foam, will give solidity tocathode and anode with a very low impact on material budget. The entiredetector is sustained by permaglass rings glued at the edges. These rings areuse to assembly the CGEM together with a dedicated Vertical Insertion Systemand moreover there is placed the On-Detector electronic. The anode has beenimproved w.r.t. the state of the art through a jagged readout that minimize theinter-strip capacitance. The mechanical challenge of this detector requires aprecision of the entire geometry within few hundreds of microns in the wholearea. In this presentation will be presented an overview of the constructiontechnique and the validation of this technique through the realization of aCGEM and its first tests. These activities are performed within the frameworkof the BESIIICGEM Project (645664), funded by the European Commission in theaction H2020-RISE-MSCA-2014.

Innovative design and construction technique for the Cylindrical GEM detector for the BESIII experiment