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ND280 is a near detector of the T2K experiment which is located in the J-PARCaccelerator complex in Japan. After a decade of fruitful data-taking, ND280 isscheduled for upgrade. The time-of-flight (ToF) detector, which is described inthis article, is one of three new detectors that will be installed in thebasket of ND280. The ToF detector has a modular structure. Each modulerepresents an array of 20 plastic scintillator bars which are stacked in aplane of 2.4 x 2.2 m2 area. Six modules of similar construction will beassembled in a cube, thus providing an almost 4pi enclosure for an activeneutrino target and two TPCs. The light emitted by scintillator is absorbed byarrays of large-area silicon photo-multipliers (SiPMs) which are attached toboth ends of every bar. The readout of SiPMs, shaping and analog sum ofindividual SiPM signals within the array are performed by a discrete circuitamplifier. An average time resolution of about 0.14 ns is achieved for a singlebar when measured with cosmic muons. The detector will be installed in thebasket of ND280, where it will be used to veto particle originating outside theneutrino target, improve the particle identification and provide a cosmictrigger for calibration of detectors which are enclosed inside it.

A 4pi time-of-flight detector for the ND280/T2K upgrade