Optimization of the measurement of the mixing angle θ_<e3> by using neutrinos from Kashiwazaki-Kariwa Nuclear Reactors.

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The following investigation has been done.1) Investigation of liquid scintillator and acrylic vesselAppropriate acryl for a vessel has been chose.Long term stability test is still going on.2) R/D of fast FADCA prototype FADC module of 500MHz, 8bit has been produced and tested.Linearity : sufficiently goodDigital integration in FPGA on the module has been proved to be sufficiently fast for a trigger.3) SimulationA process for the absorption of neutrons by Gd has been implemented by the collaboration with Geant4 developers, which will be provided for the public use after the test of the performance.A simulation program both for a prototype detector and for a full detector is now almost ready for use. The is now being tuned.4) Test of Low noise 10" photomultiplier tube.Investigation has been done by usin HPK 10" PMT. It has been proved that it has sufficient performance for the neutrino detector. Low noise PMT is considered to be available by using a new special furnace.