The main goal of the T2K long-baseline neutrino experiment is the precise measurement of the parameters of neutrino oscillation and the search for CP-violation in the lepton sector. In 2017, the T2K collaboration launched the Near Detector Upgrade project. This upgrade aims to reduce the systematic errors of the oscillation parameters from 6-7% to 3-4%. In order to accomplish such goal, ND280 Upgrade proposes to implement new upstream trackers to improve the wide angle acceptance and low momentum threshold. One of the novel technologies introduced in ND280 Upgrade is super fine-grained (SuperFGD) scintillator target with 3D WLS fiber readout. The detector will consist of about 2 million (192x184x56) scintillation cubes of 1-cm size. Each cube has three orthogonal holes for WLS fibers to provide 3D optical readout. The total mass of the detector is about 2 tons and the number of the readout channels is about 60,000. This paper presents the current status of the development of this detector.

中文翻译：

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用于 T2K 实验的新型 3D 细粒度闪烁探测器

T2K 长基线中微子实验的主要目标是精确测量中微子振荡参数和寻找轻子扇区中的 CP 违规。2017年，T2K合作启动近探测器升级项目。本次升级旨在将振荡参数的系统误差从6-7%降低到3-4%。为了实现这一目标，ND280 Upgrade 建议实施新的上游跟踪器，以提高广角接受度和低动量阈值。ND280 升级中引入的新技术之一是具有 3D WLS 光纤读数的超细粒度 (SuperFGD) 闪烁体目标。探测器将由大约 200 万个 (192x184x56) 大小为 1 厘米的闪烁立方体组成。每个立方体都有三个用于 WLS 光纤的正交孔，以提供 3D 光学读数。探测器总质量约2吨，读出通道数约6万个。本文介绍了该探测器的发展现状。