# Future Accelerator-Based Neutrino Beams

## TL;DR

This paper reviews current high-power neutrino beam facilities, discusses planned upgrades, and explores future accelerator proposals, emphasizing R&D efforts to enhance performance and manage costs in neutrino physics research.

## Contribution

It provides a comprehensive overview of existing and planned accelerator-based neutrino beam facilities and outlines future development challenges and R&D strategies.

## Key findings

- Fermilab Main Injector delivers over 0.75 MW of 120 GeV protons.
- J-PARC approaches 0.5 MW of 30 GeV proton beam power.
- Proposals for next-generation accelerator facilities are discussed.

## Abstract

High energy and high beam power accelerators are extensively used for the neutrino physics research. At present, the leading operational facilities are the Fermilab Main Injector complex that delivers over 0.75 MW of 120 GeV protons on the neutrino target, and the J-PARC facility in Japan which recently approached 0.5 MW of the 30 GeV proton beam power. Here we present the status and planned upgrades of the Fermilab and J-PARC accelerators and proposals for the next generation accelerator-based facilities, their challenges and required and ongoing accelerator R&D programs aimed to address corresponding cost and performance risks.