[en] We propose a new experiment to measure the muon anomalous magnetic moment g - 2 and electric dipole moment with a novel technique called ultra-slow muon beam at J-PARC. Precision measurement of these dipole moments plays an important role in fundamental physics to search for a new physics beynd standard model. The concept of the experiment and its current status is described.

No abstract available

[en] The spin structure of the nucleon has been investigated for long years. In the light of new experimental data from HERMES, COMPASS, J-Lab, and RHIC-spin, current status of our knowledge of the spin structure is discussed. Prospects with future facilities are also described

[en] The E704 experiment conducted at the Fermi National Accelerator Laboratory found a large single spin asymmetry (SSA), which has lead to a great extention of the framework for high energy processes based on Quantum Chromodynamics (QCD). The SSA reflects the chiral symmetry breaking in the strong interaction. Clarification of its origin requires formulating the intrinsic transverse momentum of quarks and the quark-gluon correlation in the hadrons, which has become a hot and challenging subject in QCD. Experimentally, RHIC at the Brookhaven National Laboratory is measuring SSA at higher energy, and the measurement of SSA in lepton-nucleon scattering is also ongoing. This article is devoted to survey the recent development in the understanding of SSA. (author)

[en] Polarized pp collisions at high energy will provide a unique opportunity to study the spin structure of the nucleon and the symmetries in the nature. The physics program with the polarized beams at RHIC is overviewed with the expected sensitivities and the successful commissioning of the first polarized proton beam at RHIC is reported

[en] The development of a superconducting solenoid for a new Muonium HyperFine Structure, MuHFS, measurement at J-PARC has been underway since 2010. High homogeneity of magnetic field below 1 ppm is required for this experiment. Superconducting main coils were designed and error fields caused by the main coil misalignment were evaluated for designing superconducting shim coils. The coil deformation by the coil winding, thermal contraction and hoop stress due to the magnetic force was also estimated. A quench protection study was performed to determine the required parameters of the superconducting strand.

[en] This proceeding describes update of the magnet for muon g-2/EDM precision measurements. The design method for the magnet has been developed and candidate coil block (CB) and iron yoke placements have been designed considering the superconducting limitations of current density 125 A/mm2 and maximum magnetic field on CBs less than 5.5 T, as reported on NIMA vol.890 2018. Since then, the magnet design has progresses and introduced holes on the iron yoke for shim trays and refrigerators. The progresses have made it necessary to optimize the CB placements again according to the iron yoke new design. This presentation discusses the optimization results of magnetic field distribution and CB placements, comparing the former magnetic design. (author)

[en] Experiments of g-2/EDM precise measurements are under preparation in J-PARC and they use a high field (3.0 T) muon beam storage magnet (MBSM) with a fiducial volume of cylindrical fiducial volume with 3cm-radial width, 10cm-vertical (axial) height and 66.6 cm diameter with less than 0.2 ppm peak-to-peak magnetic field homogeneity. Muons will be injected by the spiral injection from the magnet top through iron-yoke, reducing axial speed by the fringe field and will be stopped by a kicker radial field. However, there are some error fields and some corrections of muon injection orbit are necessary. Then, the steering magnets (SMs) are under developments and they will be placed inside and outside of the MBSM. SMs should have active shield coils to avoid additional error fields from magnetic interactions with structural metals. Then, they are ASSMs (Active Shield SM). Furthermore, ASSM should have small joule heat generations to avoid error fields due to temperature change of the iron-yoke. Under these specifications, we have done a trial design ASSMs using newly developed magnetic design method expanded from MRI gradient field coil design method. (author)

[en] Contribution of strange quark spin to the proton spin, Δs, is one of the major interests in connection with 'Proton Spin Problem'. Neutrino-nucleon elastic scattering is a unique method to determine directly Δs, while lepton DIS measures the partial moment of Δs. Extensive physics simulation has been done to study the sensitivity of the Δs determination at the J-PARC neutrino beam line using two liquid scintillator targets

[en] Japan Proton Accelerator Research Complex (J-PARC), which is JAERI and KEK Joint Project, is now under construction at the Tokai campus of JAERI. Project purpose is providing the high intensity proton beam for nuclear/particle physics, material sciences so far. However, several experiments require the polarized proton beam is also proposed for spin physics. In this report, the scheme of the polarized proton beam acceleration at the J-PARC accelerator complex will be discussed. (author)