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A large prototype of 1.3m3 was designed and built as a demonstrator of thesemi-digital hadronic calorimeter (SDHCAL) concept proposed for the future ILCexperiments. The prototype is a sampling hadronic calorimeter of 48 units. Eachunit is built of an active layer made of 1m2 Glass Resistive PlateChamber(GRPC) detector placed inside a cassette whose walls are made ofstainless steel. The cassette contains also the electronics used to read outthe GRPC detector. The lateral granularity of the active layer is provided bythe electronics pick-up pads of 1cm2 each. The cassettes are inserted into aself-supporting mechanical structure built also of stainless steel plateswhich, with the cassettes walls, play the role of the absorber. The prototypewas designed to be very compact and important efforts were made to minimize thenumber of services cables to optimize the efficiency of the Particle FlowAlgorithm techniques to be used in the future ILC experiments. The differentcomponents of the SDHCAL prototype were studied individually and strictcriteria were applied for the final selection of these components. Basiccalibration procedures were performed after the prototype assembling. Theprototype is the first of a series of new-generation detectors equipped with apower-pulsing mode intended to reduce the power consumption of this highlygranular detector. A dedicated acquisition system was developed to deal withthe output of more than 440000 electronics channels in both trigger andtriggerless modes. After its completion in 2011, the prototype was commissionedusing cosmic rays and particles beams at CERN.

Construction and commissioning of a technological prototype of a high-granularity semi-digital hadronic calorimeter