03 Particle Sources and Alternative Acceleration Techniques
A09 Muon Accelerators and Neutrino Factories
Paper Title Page
TUPME023 Overview of a muon capture section for muon accelerators 1398
 
  • D. Stratakis, J.S. Berg, H. K. Sayed
    BNL, Upton, Long Island, New York, USA
  • D.V. Neuffer, P. Snopok
    Fermilab, Batavia, Illinois, USA
  • P. Snopok
    Illinois Institute of Technology, Chicago, Illinois, USA
 
  Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
We describe a muon capture section to manipulate the longitudinal and transverse phase-space so that to collect efficiently a muon beam produced from an intense proton source target. We show that this can be achieved by using a set of properly tuned rf cavities that captures the beam into string of bunches and aligns them into nearly equal central energies, and a solenoidal chicane that filters high momentum particles, followed by a proton absorber that reduces the energy of all particles. This work elucidates the key parameters that are needed for successful muon capture, such as the required rf frequencies, rf gradients and focusing field. We discuss the sensitivity in performance against the number of different rf frequencies and accelerating rf gradient.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME023  
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TUPME024 A hybrid six-dimensional muon cooling channel with gas filled cavities 1401
 
  • D. Stratakis
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Obtaining the desired micron-scale emittances for a Muon Collider requires transporting the muon beam through long sections of a beam channel containing rf cavities, absorbers, and focusing solenoids. Here we discuss possible implementation of high-pressure gas-filled RF cavities in a 6D ionization cooling channel and some technical issues associated with it. The key idea of our scheme is a hybrid approach that uses high-pressure gas to avoid cavity breakdown, along with discrete LiH absorbers to provide the majority of the energy loss. We show that the channel performs as well as the original vacuum rf channel while potentially avoiding degradation in rf gradient associated with the strong magnetic field in the cooling channel.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME024  
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TUPRI001 ESSnuSB: A New Facility Concept for the Production of Very Intense Neutrino Beams in Europe 1550
 
  • E. Bouquerel, E. Baussan, M. Dracos, F.R. Osswald, P. Poussot, N. Vassilopoulos
    IPHC, Strasbourg Cedex 2, France
 
  A new project for the production of a very intense neutrino beam has arisen to enable the discovery of leptonic CP violation and neutrino mass hierarchy. This facility will use the proton linac of the European Spallation Source (ESS) in Lund to deliver the neutrino super beam. The ESS linac is expected to be fully operational at 5 MW power by 2022, producing 2 GeV and 2.86 ms long proton pulses at a rate of 14 Hz. An upgrade of the power to 10 MW and a frequency of 28 Hz, in which half is for the neutron beam, is necessary for the production of the neutrino beam. The primary proton beam-line completing the linac will consist of switchyards and accumulator rings. The secondary beam-line producing neutrinos will consist of a four-horn/target station, decay tunnel and beam dump. A megaton scale water Cherenkov detector will be located at a baseline of about 500 km in one of the existing mines in Sweden and it will measure the neutrino oscillations. The elements of the primary and secondary beam-lines and all the possible scenarios impacting the design of the ESSnuSB facility as well as the safety issues due to the high irradiation produced are presented and discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI001  
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TUPRI002 The EUROnu Study for Future High Power Neutrino Oscillation Facilities 1553
 
  • T.R. Edgecock
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
 
  The EUROnu project was a 4 year FP7 design study to investigate and compare three possible options for future, high power neutrino oscillation facilities in Europe. These three facilities are a Neutrino Factory, a neutrino superbeam from CERN to the Frejus Laboratory and a so-called Beta Beam. The study was completed at the end of 2012 and has produced conceptual designs for the facilities and preliminary cost estimates. The designs were used to determine the physics performance. These have been used to compare the facilities. This paper will describe the designs, physics performance and costs and summarise the recommendations of the study.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI002  
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TUPRI003 Simulating the Production and Effects of Dark Currents in MICE Steps V and VI 1556
SUSPSNE014   use link to see paper's listing under its alternate paper code  
 
  • C. Hunt, J. Pasternak, M.A. Uchida
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
 
  Funding: STFC
The completion of the international Muon Ionisation Cooling Experiment (MICE) Step V will involve the construction, commissioning and use of RF cavity and Coupling Coil (RFCC) Modules. The RFCCs consist of 4 RF cavities and a solenoid magnet, and are expected to act as a source of potentially damaging electrons (dark currents) and X-rays. Ongoing work to create a high-statistics simulation of the dark current production, within RF cavities, is described. Current results predict the energy and angular spectra of emitted electrons for an RFCC, and include particle tracking, realistic field maps and ionisation energy losses in cavity windows. Individual electron emitters, parametrised by the Fowler-Nordheim equation, are used and are user-definable, allowing potential worst-case scenarios to be simulated and upper/lower limits for the total dark current to be estimated. These data are being used within the MICE Analysis and User Software (MAUS) to estimate the potential detector backgrounds and the damage that may be inflicted upon the scintillating fibre trackers.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI003  
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TUPRI005 nuSTORM Horn Optimization Study 1562
SUSPSNE015   use link to see paper's listing under its alternate paper code  
 
  • A. Liu, A.D. Bross, D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
 
  The efficiency of using magnetic horns as a pion collection device has been recognized by several neutrino projects. In the study, we began with a “NuMI-like” horn, which was applied to collect the secondary pions from bombarding the target with 120 GeV/c protons in the nuSTORM proposal. The necessity of optimizing the horn for a non-conventional neutrino beamline like the nuSTORM pion beamline was then acknowledged. This paper presents a detailed description of the optimization objectives, the Multi-objective Genetic Algorithm developed for this specific purpose, and the results of the optimization. With the full G4beamline simulation results, the success of the optimization provides an increase of 16\% in the useful muons in the ring. This methodology can be applied to any neutrino beamline configuration.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI005  
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TUPRI006 Decay Ring Design Updates for nuSTORM 1565
 
  • A. Liu, A.D. Bross, D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
 
  The nuSTORM FODO decay ring is designed to achieve both a large phase space acceptance of 2 mm and a large momentum acceptance of 3.8±10\% GeV/c. The goal is challenging, not only because the high dispersion needed at the Beam Combination Section (BCS) of the ring enlarges the beam size, but also because of the nonlinear beam dynamics. In this paper the preliminary design of the nuSTORM ring is presented, which includes the requirements, the ring parameters, and also the tracking results in the MADX PTC\TRACKING module.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI006  
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TUPRI008 Target System Concept for a Muon Collider/Neutrino Factory 1568
 
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • H.G. Kirk, H. K. Sayed, D. Stratakis
    BNL, Upton, Long Island, New York, USA
  • N. Souchlas, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  A concept is presented for a Target System in a staged scenario for a Neutrino Factory and eventual Muon Collider, with emphasis on initial operation with a 6.75 GeV proton beam of 1 MW power, and 50 Hz of pulses 3-ns long. A radiation cooled graphite target will be used in the initial configuration, with an option to replace this with a free-liquid-metal-jet target should 4-MW beam power become available at a later stage.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI008  
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