Long-baseline neutrino oscillation (LBNO) experiments, such as the currently ongoing T2K experiment and the next-generation experiment Hyper-Kamiokande (HK), extract the oscillation parameters from the neutrino energy spectrum measured at the far detector, SuperKamiokande in the case of T2K. However, the statistical and systematic uncertainties need to be minimized to achieve the desired precision.
For this purpose, LBNO experiments have not only a far detector but also a near detector, called ND280 in T2K, which allows the characterization of the neutrino beam flux before oscillation and the measurement of the relevant neutrino cross-sections.
ND280 has been successfully operated for this purpose since 2009, and it is crucial for the success of T2K. In 2016, the collaboration decided to upgrade ND280 for the T2K-II phase, which will end with the start of HK. The upgraded ND280 is planned to serve also as near detector of HK.
The talk will give an overview of the upgrade project, which was successfully completed with the installation of the last new subdetectors in May 2024, and also a short outlook towards the HK era.
Giada Caneva, Elia Bertoldo, Francesco Sciotti