[en] The front-end of a neutrino factory (or a μ⁺μ^- collider) has a potential to provide a high-intensity muon beam of low energy. It would give us great physics opportunities with a tremendous number of muons (of about 10¹²/s). Among many possibilities, one of the important physics subjects is a search for muon lepton flavor violation (LFV). The physics motivation of muon LFV and the latest experimental status are given. Finally, a high-intensity muon source, in particular PRISM in Japan, is discussed

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[en] Among various projects for future high-energy colliders a special place is occupied by the muon collider. It is interesting to note that if this machine is ever built, this will be the first place where collisions of unstable particles can be investigated. It turns out that even though the muon is only slightly unstable, this instability, as a matter of principle, brings in a new interesting effect. We name this effect a linear beam size effect because it predicts that certain scattering cross sections must be proportional to the transverse sizes of the colliding muon beams. This paper is devoted to the detailed presentation of this effect. (author)

[en] Backgrounds arising from muon decay at a 4 TeV muon collider are summarized, and some implications for a muon collider detector are discussed. Ideas on how to cope with the significant background levels are also described

[en] During the last few decades, a variety of methods has been developed which makes use of polarized positive muons as a microscopic probe of the magnetic properties of condensed matter (muon spin rotation, relaxation, resonance, μSR). Until now, available beams for μSR studies have delivered 100% polarized muons with energies in the MeV range, resulting in a deep penetration of the muons into the sample material under investigation. This presently limits the applications of the μSR technique to the study of the bulk characteristics of matter. To be able to control the implantation depth, a very low energy beam of polarized muons is being developed at the Paul Scherrer Institute. Very slow polarized muons (kinetic energy ∼10 eV, polarization ∼90%) are obtained from the moderation of a high energy muon beam in a thin film of an appropriate condensed gas. These muons can be used as a source for a beam of tunable energy between a few tens of eV and some tens of keV. Implantation depths in the range of few to a few hundreds of nanometers can thus be achieved by varying the energy. (orig.)

[en] In order to perform μSR and μe measurements with an instantaneously intense pulsed 4-MeV muon beam currently available at Dai Omega, which is a large solid-angle-axial focusing superconducting surface muon channel at KEK-MSL, the detector segmentation in the conventional digital technique was improved to accept the predicted event rate of 2.0x10⁴ muons/spill. A new detection system was designed to collect intense μe decay positrons with 128 two-fold coincidence detector elements. A major feature of the new detection system was an employment of multi-anode phototubes (MAPMT) to make the detection system be compact. We mitigated the problems related cross talks among channels by employing a special fiber holder. The performance of the detection system was confirmed by μSR and μe test experiments

[en] Meson/Muon science research program under planning at the future high intensity proton accelerator of the Japan Hadron Project is reviewed. Main subjects will be μSR studies on condensed matter, muon catalyzed fusion and fundamental physics, etc. Possible future development of new muon beam concept is also described. (author)

[en] The authors discuss the design of a high luminosity (10³⁵ cm^-2s^-1), high energy (2+2 TeV) mu⁺mu^- collider, starting from the proton accelerator needed to generate the muon beams and proceeding through the muon storage ring

[en] In November 1997 a workshop was held at Fermilab to explore the physics potential of the first muon collider, and the physics potential of the accelerator complex at the 'front-end' of the collider. An extensive physics program emerged from the workshop. This paper attempts to summarize this physics program and identify the main conclusions from the workshop