Bridging grant for T2K Project

T2 K实验使用的是在日本东海的日本质子加速器研究综合体（J-PARC）产生的高强度μ介子-中微子束。 光束被引导到离轴2.5度的50千吨水切伦科夫探测器，超级神冈（SK），它位于295公里外的神冈矿。 通过使用离轴束的μ子中微子的能谱是狭窄的，并集中在附近的最大概率μ子中微子消失在SK。μ子中微子束也测量了近探测器在280米（ND 280）从中微子束生产目标。 近距离探测器提供了μ子-中微子速率的总体归一化，并测量了振荡前中微子的能谱。 ND 280探测器复合体的一部分是一组三个大体积的时间投影室（TPC），可提供出色的带电粒子跟踪，并使用其动量和dE/dx测量进行粒子识别。

The T2K experiment uses a high intensity muon-neutrino beam produced at the Japan Proton Accelerator Research Complex (J-PARC) in Tokai, Japan. The beam is directed 2.5 degrees off-axis to the 50 kTon water Cerenkov detector, Super-Kamiokande (SK), which sits 295 km away in the Kamioka mine. By using an off-axis beam the energy spectrum of the muon-neutrinos is narrower, and concentrated around the maximum probability for muon-neutrino disappearance at SK. The muon-neutrino beam is also measured by a near detector at 280 m (ND280) from the neutrino beam production target. The near detector provides the overall normalisation for the muon-neutrino rate, and measures the energy spectrum of the neutrinos before oscillation. Part of the ND280 detector complex is a set of three large volume Time Projection Chambers (TPCs) which provide excellent charged particle tracking, and particle identification using its momentum and dE/dx measurements.