Operational Status and Power Upgrade Prospects of the Neutrino Experimental Facility at J-PARC

TL;DR

This paper reviews the operational experience and upgrade prospects of the J-PARC neutrino facility, highlighting its readiness for higher power beams essential for advancing CP violation research in neutrino physics.

Contribution

It provides a detailed assessment of the facility's operational stability and discusses the technical feasibility of increasing beam power to multi-MW levels.

Findings

Stable operation at 230 kW over five years.

Successful replacement of key components in 2013-2014.

Potential to achieve multi-MW beam power.

Abstract

In order to explore CP asymmetry in the lepton sector, a power upgrade to the neutrino experimental facility at J-PARC is a key requirement for both the Tokai to Kamioka (T2K) long-baseline neutrino oscillation experiment and a future project with Hyper-Kamiokande. Based on five years of operational experience, the facility has achieved stable operation with 230 kW beam power without significant problems on the beam-line apparatus. After successful maintenance works in 2013-2014 to replace all electromagnetic horns and a production target, the facility is now ready to accomodate a 750-kW-rated beam. Also, the possibility of achieving a few to multi-MW beam operation is discussed in detail.