Design and construction of INGRID neutrino beam monitor for T2K neutrino experiment

Abstract The INGRID(Interactive Neutrino GRID) detector is designed to measure the neutrino beam direction with a precision better than 1 mrad for T2K experiment. INGRID consists of 16 modules and placed around the beam center at 280 m downstream of the proton beam target. The module is a sandwich of iron targets and scintillator tracking planes which consist of X–Y layers. We have constructed all scintillator tracking planes and measured light yield of all scintillators. Currently we install 1st module into the detector hall and cosmic events are observed. INGRID is ready for 1st neutrino event from April 2009.