FOAC  —  Secondary Beam Facilities: Neutrons, Muons, and Neutrinos   (20-May-05   08:30—10:15)

Chair: C.D. Moore, Fermilab, Batavia, Illinois

Paper Title Page
FOAC001 High Intensity Muon Beam Facilities with FFAG 29
  • Y. Kuno
    Osaka University, Osaka
  A new highly intense muon source with narrow beam energy spread and high purity, based on a FFAG ring, is under development in Japan. It is called the PRISM project, which stands for Phase Rotated Intense Slow Muon source. The aimed beam intensity is about 1011-1012 muons per year, which is about 1000 or 1000 times that presently available. The muon beam energy is low, of 20 MeV in kinetic energy, for stopped muon experiments. In particular, high luminosity would be important, and narrow beam spread can be achieved by phase (bunch) rotation in the FFAG ring. It is expected to compress the beam energy spread from about 30% down to about 3 %. At Osaka university, the PRISM-FFAG ring is now under construction. The special requirements for the PRISM-FFAG ring, compared to other FFAG rings so far developed, is to have large acceptance dedicated for a muon beam, and high-gradient RF to complete phase rotation within a muon lifetime. In this presentation the present designs of PRISM and status of construction will be presented.  
FOAC002 Status of Neutrino Factory Design and R&D 209
  • D. Li
    LBNL, Berkeley, California
  Funding: Work supported by the US Department of Energy under contract No. DE-AC0376SF00098

Neutrino physics has become increasingly interesting to the high-energy physics community, as it may provide clues to new physics beyond the standard model. The physics potential of a Neutrino Factory–a facility to produce high-energy, high-intensity, high-brightness neutrino beams from decays of muons stored in a muon storage ring–is thus very high. There has been a global R&D effort aimed at a Neutrino Factory design that meets the physics requirements and addresses the key technologies, such as targetry, muon ionization cooling and acceleration. Tremendous progress has been made in the past few years in many aspects of accelerator technology. In this paper, we will review recent worldwide progress toward a cost-effective Neutrino Factory design, with emphasis on the associated R&D programs under the auspices of the U.S. Neutrino Factory and Muon Collider Collaboration.

FOAC003 New Concepts in FFAG Design for Secondary Beam Facilities and Other Applications 261
  • M.K. Craddock
    UBC & TRIUMF, Vancouver, British Columbia
  Fixed Field Alternating Gradient accelerators offer much higher acceptances and repetition rates - and therefore higher beam intensities - than synchrotrons, at the cost of more complicated magnet and rf cavity designs. Perhaps because of the difficulty and expense anticipated, early studies never progressed beyond the stage of successful electron models, but in recent years, with improvements in magnet and rf design technology, FFAGs have become the focus of renewed attention. Two proton machines have now been built, and three more, plus a muon phase rotator, are under construction. In addition, more than 20 designs are under study for the acceleration of protons, heavy ions, electrons and muons, with applications as diverse as treating cancer, irradiating materials, driving subcritical reactors, boosting high-energy proton intensity, and producing neutrinos. Moreover, it has become apparent that FFAG designs need not be restricted to the traditional 'scaling' approach, in which the orbit shape, optics and tunes are kept fixed. Dropping this restriction has revealed a range of interesting new design possibilities. This paper will review the various approaches being taken.  
FOAC004 The Numi Neutrino Beam At Fermilab
  • S.E. Kopp
    The University of Texas at Austin, Austin, Texas
  The Neutrinos at the Main Injector (NuMI) is a conventional neutrino beam facility which will use the intense 120 GeV proton beam from the Fermilab Main Injector accelerator. The facility is envisaged to service a variety experiments, in particular the already-constructed MINOS long baseline oscillation experiment, and the proposed NOvA experiment to observe muon neutrino to electron neutrino oscillations. Summarized will be the design of the primary and secondary beam focusing systems, instrumentation to validate the neutrino beam intensity, direction, and energy spectrum, and considerations for coping with the 0.4 MWatt MI beam. The beam line will be commissioned December, 2004, through February, 2005, whereupon operations may begin. Data from the commissioning and experience from first operations will be presented. Further, the suitability of the facility for accepting beam from a proposed 2MW proton driver is discussed.  
FOAC005 Reliability and Availability Studies in the RIA Linac Driver 443
  • E.S. Lessner, P.N. Ostroumov
    ANL, Argonne, Illinois
  Funding: Work supported by the U. S. Department of Energy under contract W-31-109-ENG-38.

The RIA facility will include various complex systems and must provide radioactive beams to many users simultaneously. The availability of radioactive beams for most experiments at the fully-commissioned facility should be as high as possible within design cost limitations. To make a realistic estimate of the achievable reliability a detailed analysis is required. The RIA driver linac is a complex machine containing a large number of SC resonators and capable of accelerating multiple-charge-state beams. At the pre-CDR stage of the design it is essential to identify critical facility subsystem failures that can prevent the driver linac from operating. The reliability and availability of the driver linac are studied using expert information and data from operating machines such as ATLAS, APS, JLab, and LANL. Availability studies are performed with a Monte-Carlo simulation code previously applied to availability assessments of the NLC facility [] and the results used to identify subsystem failures that affect most the availability and reliability of the RIA driver, and guide design iterations and component specifications to address identified problems.

*J.A. Nolen, Nucl. Phys. A. 734 (2004) 661.