Generation of negative slow muon beam in J-PARC muon facility
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The world strongest pulsed muon facility has been operated since 2008 in J-PARC (Japan Proton Accelerator Research Complex). This facility utilizes 3-GeV proton to produce muon beam, and thus the negative pion and also negative muon yields are superior to the other meson factories in the world. We try to slow down these negative muons. Negative slow muon beam is desired to check the standard model and search a new physical rule, as well as various applications in material science.Keywords:
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The muon science facility (MUSE), along with the neutron, hadron, and neutrino facilities, is one of the experimental areas of the J‐PARC project, which was approved for construction at the Tokai JAEA site. The MUSE facility is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. Construction of the MLF building was started in the beginning of 2004, and first muon beam is expected in the autumn of 2008.As a next step, we are planning to install, a Super Omega muon channel with a large acceptance of 400 msr, to extract the world strongest pulsed surface muon beam. Its goal is to extract 4×108 surface muons/s for the generation of the intense ultra slow muons, utilizing laser resonant ionization of Mu by applying an intense pulsed VUV laser system. As maximum 1×106 ultra slow muons/s will be expected, which will allow for the extension of μSR into the field of thin film and surface science.
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Muon Cooling is the key factor in building of a Muon collider, (to a less degree) Muon storage ring, and a Neutrino Factory. Muon colliders potential to provide a probe for fundamental particle physics is very interesting, but may take a considerable time to realize, as much more work and study is needed. Utilizing high intensity Muon sources–Neutrino Factories, and other intermediate steps are very important and will greatly expand our abilities and confidence in the credibility of high energy muon colliders. To obtain the needed collider luminosity, the phase-space volume must be greatly reduced within the muon life time. The Ionization cooling is the preferred method used to compress the phase space and reduce the emittance to obtain high luminosity muon beams. We note that, the ionization losses results not only in damping, but also heating. The use of alternating solenoid lattices has been proposed, where the emittance are large. We present an overview of the cooling and discuss formalism, solenoid magnets and some beam dynamics.
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Intense muon beams have many potential applications, including neutrino factories and muon colliders. However, muons are produced as tertiary beams, resulting in diffuse phase space distributions. To make useful beams, the muons must be rapidly cooled before they decay. An idea conceived recently for the collection and cooling of muon beams, namely, the use of a Quasi-Isochronous Helical Channel (QIHC) to facilitate capture of muons into RF buckets, has been developed further. The resulting distribution could be cooled quickly and coalesced into a single bunch to optimize the luminosity of a muon collider. After a brief elaboration of the QIHC concept, some recent developments are described.
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Multi-TeV muon colliders are an important option for a future energy frontier lepton collider since synchrotron radiation in a circular collider is significantly less than that expected in an electron collider. Muon decays are a major source of beam induced backgrounds that can affect the physics seen in a muon collider. For a muon collider with 750 GeV μ + μ with 2×10 12 μ per bunch we would expect 8.6×10 5 muon decays per meter for the two beams. These backgrounds include electrons from muon decays, synchrotron radiation from the decay electrons, hadrons produced by photo-nuclear interactions, coherent and incoherent beam-beam pair production and Bethe-Heitler (B-H) muon production. This paper will describe a simulation of the B-H muon production in a muon collider. These muons can penetrate the collider ring magnets and shielding and can enter into the detector region. This simulation tracks B-H muons produced in the collider ring in the range of ±175 m from the interaction point.
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Muon cooling is an important technology for novel muon experiments involving muon acceleration such as the J-PARC muon g-2/EDM experiment, a muon microscope, and a muon collider. At J-PARC, the ultra-slow muon source, generated by laser ionization of thermal muonium in the vacuum, is under development. The emittance of the muon beam can be reduced by three orders of magnitude compared to the conventional muon beam through the re-acceleration of the ultra-slow muon. At the H2 area, one of the branches of the high-intensity pulsed muon beamline (H-line) at J-PARC, the designed flux of the ultra-slow muon source is an order of $10^5$/s, with completion projected for FY 2026. This paper provides the current status of muon cooling at J-PARC and its future prospects.
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Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Y. Matsuda, P. Bakule, P. Strasser, K. Ishida, T. Matsuzaki, M. Iwasaki, Y. Miyake, K. Shimomura, S. Makimura, K. Nagamine; Recent Development of a point positive muon source at the RIKEN‐RAL muon facility. AIP Conf. Proc. 14 October 2004; 721 (1): 313–316. https://doi.org/10.1063/1.1818423 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search
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Employing intense muon sources to carry out forefront low energy research, such as the search for muon-number non-conservation, or for the purpose of providing intense high energy neutrino beams (ν factory) represents very interesting possibilities. If successful, such efforts would significantly advance the state of muon technology and provides intermediate steps in technologies required for a future high energy muon collider complex. High intensity muon: production, capture, cooling, acceleration, and multiturn muon storage rings are some of the key technology issues that needs more studies and development. A muon collider require basically same number of muons as for the muon storage ring Neutrino Factory, but would require more cooling, and simultaneus capture of both ±μ. We present an overview of Muon Sources–Neutrino Factories, example of a muon storage ring at BNL, and possible upgrades to a full Muon Collider.
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