PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Detector
The upgrade project of the T2K near detector
K. Iwamoto* On behalf of the ND280 Upgrade work group
*corresponding author
Full text: pdf
Published on: August 02, 2019
The T2K neutrino oscillation experiment established the $\nu_{\mu}\rightarrow \nu_{e}$ appearance with 10% of the original beam request of 7.8$\times$10$^{21}$ 30 GeV protons on target (POT). In view of the J-PARC program of upgrades of the beam intensity, the T2K-II proposal extends the run up to 20$\times$10$^{21}$ POT to establish the charge-parity (CP) violation at 3$\sigma$ level for a significant fraction of the possible $\delta_{CP}$ values. To achieve this goal, it is important to accomplish near detector upgrades to reduce the overall statistical and systematic uncertainties from approximately 6\% to the level of 4%.
The T2K near detector ND280 upgrade project was launched in January 2017, and the proposal was submitted to the CERN SPSC and to the JPARC PAC in January 2018. ND280 Upgrade implements two horizontal high-angle time projection chambers (HA-TPCs), a highly segmented scintillator detector Super-FGD, and time-of-flight (TOF) detectors to the upstream of the current near detector. HA-TPCs are built to achieve the wide angle acceptance with the light field cages and resistive Micromegas detectors for the charge readout. SuperFGD consists of $1\times1\times1$ cm$^3$ plastic scintillator cubes readout by three WLS fibers directed to multi-pixel photon counters (MPPCs), providing detailed tracking and particle identification (PID) information. TOF complements the HA-TPCs and Super-FGD PID by determining track direction and time information. Combination of these detectors is planned to be installed to obtain a 4$\pi$ acceptance for neutrino charged current interactions with improved tracking performance for low energy charged particles.
DOI: https://doi.org/10.22323/1.340.0299
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