Mr Sergei Fedotov (Institute for Nuclear Research of the Russian Academy of Sciences)
The long baseline neutrino experiment T2K has launched the upgrade project of its near detector ND280, crucial to reduce the systematic uncertainty in the prediction of number of events at the far detector to less than 4%. An essential component of this upgrade is a highly segmented scintillator detector, acting as a fully active target for the neutrino interactions. We adopt a novel design, called SuperFGD, with dimensions of ~200x180x60 cm^3 and a total mass of about 2 tons. It consists of about 2x106 small scintillator cubes each of 1 cm3. Each cube is covered by a chemical reflector and has three orthogonal cylindrical holes of 1.5 mm diameter. The signal readout from each cube is provided by wavelength shifting fibers inserted in these holes and connected to micro-pixel avalanche photodiodes MPPCs. The front-end electronics will be based on the CITIROC chip designed for the multi-channel readout of SiPM. The total number of channels will be ~60,000. We have demonstrated that this detector, providing three 2D projections, has excellent tracking performance, including a $4 \pi$ angular acceptance, especially important for short proton and pion tracks. Prototypes of this detector have been tested in a beam of charged particles at CERN in 2017-2018 and recently with a neutron beam at LANL in 2019. The project has been approved by CERN as part of the Neutrino Platform (NP07). In this talk, we will report on the design of this detector, its expected performance, the results of the test beams and the plan for the construction.