J-PARC MUSE H-line optimization for the g-2 and MuHFS experiments

TL;DR

This paper details the optimization of the J-PARC MUSE H-line beamline layout to enhance experimental accuracy for g-2 and MuHFS experiments, focusing on maximizing transmission efficiency and minimizing leakage fields.

Contribution

It presents a new optimized beamline design for g-2 and MuHFS experiments at J-PARC/MUSE, balancing beam size, leakage field, and muon containment.

Findings

Optimized beamline layout improves transmission efficiency.

Design reduces leakage field at critical points.

Conceptual designs of final focusing systems are provided.

Abstract

Significant deviation of the anomalous magnetic moment value (g-2) observed by the muon g-2 experiment should be confirmed by the other experiment. This value is experimentally determined by frequency difference observed by the g-2/EDM experiment and muon magnetic moment observed by the muonium hyperfine splitting experiment (MuHFS). Both two experiments are planned to be performed at H-line of the J-PARC/MUSE under construction. We optimized the beamline layout for each experiment with G4beamline. For both experiments, statistics is the most important, thus beamline transmission efficiency should be maximized. Especially for the g-2, the purpose of the present effort is to compromise between small beam size and small leakage field. For the MuHFS, it is crucial to minimize leakage field at around final focus position, and to get all stopped muons within good field region of MuHFS magnet. Conceptual design of the several final focusing systems will be presented. contribution (or invited paper) to NUFACT 11, XIIIth International Workshop on Neutrino Factories, Super beams and Beta beams, 1-6 August 2011, CERN and University of Geneva