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

以下调查已经完成。1)液体闪烁体与丙烯酸容器的研究选择了合适的丙烯酸容器。长期稳定性测试仍在进行中。2)制作并测试了500MHz， 8bit的快速FADCA原型模块的研发。线性度：足够好，在FPGA模块上的数字集成已被证明是足够快的触发器。3)与Geant4开发人员合作，实现了Gd吸收中子的模拟过程，将在性能测试后提供给公众使用。用于原型探测器和完整探测器的模拟程序现在几乎准备好使用。现在正在调音。4)低噪声10"光电倍增管测试。用HPK 10" PMT进行了调查。实验证明，它具有足够的中微子探测器性能。采用一种新型的特殊炉，可以实现低噪声PMT。

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.