Understanding and Calibrating the Calorimeter for the T2K Near Detector

T2K (Tokai-to-Kamioka) is a long-baseline neutrino experiment with the primary purpose of measuring the mixing angle θ13, using a νμ beam which is produced at J-PARC and aimed towards Super-Kamiokande (SK). A near detector located 280m from the neutrino production target, the ND280, is used to measure the neutrino energy spectrum, flavour content and interaction rates of the un-oscillated beam and to predict the neutrino interactions at SK. The downstream module of the ND280 electromagnetic calorimeter system, the DsECal, is in situ and taking data. Prior to installation in ND280, calibration data was collected whilst the DsECAL was commissioned in a beam test at CERN in 2009.