Author: Morozov, V.S.
Paper Title Page
MOP036 Epicyclic Twin-Helix Ionization Cooling Simulations 163
 
  • A. Afanasev
    Hampton University, Hampton, Virginia, USA
  • Y.S. Derbenev, V.S. Morozov
    JLAB, Newport News, Virginia, USA
  • V. Ivanov, R.P. Johnson
    Muons, Inc, Batavia, USA
 
  Funding: Supported in part by DOE SBIR grant DE-SC0005589
Parametric-resonance Ionization Cooling (PIC) is proposed as the final 6D cooling stage of a high-luminosity muon collider. For the implementation of PIC, we earlier developed an epicyclic twin-helix channel with correlated behavior of the horizontal and vertical betatron motions and dispersion. We now insert absorber plates with short energy-recovering units located next to them at the appropriate locations in the twin-helix channel. We first demonstrate conventional ionization cooling in such a system with the optics uncorrelated. We then adjust the correlated optics state and induce a parametric resonance to study ionization cooling under the resonant condition.
 
 
MOP043 Simulations of a Muon Linac for a Neutrino Factory 181
 
  • K.B. Beard
    Muons, Inc, Batavia, USA
  • S.A. Bogacz, V.S. Morozov, Y. Roblin
    JLAB, Newport News, Virginia, USA
 
  Funding: Supported in part by DOE grant DE-FG-08ER86351
The Neutrino Factory baseline design involves a complex chain of accelerators including a single-pass linac, two recirculating linacs and an FFAG. The first linac follows the capture and bunching section and accelerates the muons from about 244 to 900 MeV. It must accept a high emittance beam about 30 cm wide with a 10% energy spread. This linac uses counterwound, shielded superconducting solenoids and 201 MHz superconducting cavities. Simulations have been carried out using several codes including Zgoubi, OptiM, GPT, and G4beamline, both to determine the optics and to estimate the radiation loads on the elements due to beam loss and muon decay.
 
 
MOP052 Matched Optics of Muon RLA and Non-Scaling FFAG ARCS 196
 
  • V.S. Morozov, S.A. Bogacz, Y. Roblin
    JLAB, Newport News, Virginia, USA
  • K.B. Beard
    Muons, Inc, Batavia, USA
  • D. Trbojevic
    BNL, Upton, Long Island, New York, USA
 
  Funding: Supported in part by US DOE STTR Grant DE-FG02-08ER86351
Recirculating Linear Accelerators (RLA) are an efficient way of accelerating short-lived muons to multi-GeV energies required for Neutrino Factories and TeV energies required for Muon Colliders. To reduce the number of required return arcs, we employ a Non-Scaling Fixed-Field Alternating-Gradient (NS-FFAG) arc lattice design. We present a complete linear optics design of a muon RLA with two-pass linear NS-FFAG droplet return arcs. The arcs are composed of symmetric cells with each cell designed using combined function magnets with dipole and quadrupole magnetic field components so that the cell is achromatic and has zero initial and final periodic orbit offsets for both passes’ energies. Matching to the linac is accomplished by adjusting linac quadrupole strengths so that the linac optics on each pass is matched to the arc optics. We adjust the difference of the path lengths and therefore of the times of flight of the two momenta in each arc to ensure proper synchronization with the linac. We investigate the dynamic aperture and momentum acceptance of the arcs.
 
 
TUOCN2 Spin-Manipulating Polarized Deuterons 747
 
  • V.S. Morozov
    JLAB, Newport News, Virginia, USA
  • A. Chao
    SLAC, Menlo Park, California, USA
  • F. Hinterberger
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
  • A.M. Kondratenko
    GOO Zaryad, Novosibirsk, Russia
  • A.D. Krisch, M.A. Leonova, R.S. Raymond, D.W. Sivers, V.K. Wong
    University of Michigan, Spin Physics Center, Ann Arbor, MI, USA
  • E.J. Stephenson
    IUCF, Bloomington, Indiana, USA
 
  Funding: This research was supported by grants from the German BMBF Science Ministry, its JCHP-FFE program at COSY and the US DOE.
Spin dynamics of polarized deuteron beams near depolarization resonances, including a new polarization preservation concept based on specially-designed multiple resonance crossings, has been tested in a series of experiments in the COSY synchrotron. Intricate spin dynamics with sophisticated pre-programmed patterns as well as effects of multiple crossings of a resonance were studied both theoretically and experimentally with excellent agreement. Possible applications of these results to preserve, manipulate and spin-flip polarized beams in synchrotrons and storage rings are discussed.
 
slides icon Slides TUOCN2 [4.921 MB]  
 
WEP125 Higher-order Spin Resonances in 2.1 GeV/c Polarized Proton Beam 1716
 
  • M.A. Leonova, J. Askari, K.N. Gordon, A.D. Krisch, J. Liu, D.A. Nees, R.S. Raymond, D.W. Sivers, V.K. Wong
    University of Michigan, Spin Physics Center, Ann Arbor, MI, USA
  • F. Hinterberger
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
  • V.S. Morozov
    JLAB, Newport News, Virginia, USA
 
  Funding: This research was supported by grants from the German Science Ministry
Spin resonances can cause partial or full depolarization or spin-flip of a polarized beam. We studied 1st-, 2nd- and 3rd-order spin resonances with a 2.1 GeV/c vertically polarized proton beam stored in the COSY Cooler Synchrotron. We observed almost full spin-flip when crossing the 1st-order G*gamma=8−nuy vertical-betatron-tune spin resonance and partial depolarization near some 2nd- and 3rd-order resonances. We observed almost full depolarization near the 1st-order G*gamma=8−nux horizontal spin resonance and partial depolarization near some 2nd- and 3rd-order resonances. Moreover, we found that a 2nd-order nux resonance seems about as strong as some 3rd-order nux resonances, while some 3rd-order nuy resonances seem much stronger than a 2nd-order nuy resonance. It was thought that, for flat accelerators, vertical spin resonances are stronger than horizontal, and lower order resonances are stronger than higher order ones. The data suggest that many higher-order spin resonances, both horizontal and vertical, must be overcome to accelerate polarized protons to high energies; the data may help RHIC to better overcome its snake resonances between 100 and 250 GeV/c.
 
 
THP093 Design Status of MEIC at JLab 2306
 
  • Y. Zhang, S. Ahmed, S.A. Bogacz, P. Chevtsov, Y.S. Derbenev, A. Hutton, G.A. Krafft, R. Li, F. Marhauser, V.S. Morozov, F.C. Pilat, R.A. Rimmer, Y. Roblin, T. Satogata, M. Spata, B. Terzić, M.G. Tiefenback, H. Wang, B.C. Yunn
    JLAB, Newport News, Virginia, USA
  • S. Abeyratne, B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  • D.P. Barber
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A.M. Kondratenko
    GOO Zaryad, Novosibirsk, Russia
  • S.L. Manikonda, P.N. Ostroumov
    ANL, Argonne, USA
  • H. K. Sayed
    ODU, Norfolk, Virginia, USA
  • M.K. Sullivan
    SLAC, Menlo Park, California, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
An electron-ion collider (MEIC) is envisioned as the primary future of the JLab nuclear science program beyond the 12 GeV upgraded CEBAF. The present MEIC design selects a ring-ring collider option and covers a CM energy range up to 51 GeV for both polarized light ions and un-polarized heavy ions, while higher CM energies could be reached by a future upgrade. The MEIC stored colliding ion beams, which will be generated, accumulated and accelerated in a green field ion complex, are designed to match the stored electron beam injected at full energy from the CEBAF in terms of emittance, bunch length, charge and repetition frequency. This design strategy ensures a high luminosity above 1034 s−1cm-2. A unique figure-8 shape collider ring is adopted for advantages of preserving ion polarization during acceleration and accommodation of a polarized deuteron beam for collisions. Our recent effort has been focused on completing this conceptual design as well as design optimization of major components. Significant progress has also been made in accelerator R&D including chromatic correction and dynamical aperture, beam-beam, high energy electron cooling and polarization tracking.
 
 
MOP050 EPIC Muon Cooling Simulations using COSY INFINITY 190
 
  • J.A. Maloney, B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  • A. Afanasev, R.P. Johnson
    Muons, Inc, Batavia, USA
  • S.A. Bogacz, Y.S. Derbenev
    JLAB, Newport News, Virginia, USA
  • V.S. Morozov
    ODU, Norfolk, Virginia, USA
 
  Next generation magnet systems needed for cooling channels in both neutrino factories and muon colliders will be innovative and complicated. Designing, simulating and optimizing these systems is a challenge. Using COSY INFINITY, a differential algebra-based code, to simulate complicated elements can allow the computation and correction of a variety of higher order effects, such as spherical and chromatic aberrations, that are difficult to address with other simulation tools. As an example, a helical dipole magnet has been implemented and simulated, and the performance of an epicyclic parametric ionization cooling system for muons is studied and compared to simulations made using G4Beamline, a GEANT4 toolkit.  
 
WEP074 Correcting Aberrations in Complex Magnet Systems for Muon Cooling Channels 1615
 
  • J.A. Maloney, B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  • A. Afanasev, R.P. Johnson
    Muons, Inc, Batavia, USA
  • Y.S. Derbenev
    JLAB, Newport News, Virginia, USA
  • V.S. Morozov
    ODU, Norfolk, Virginia, USA
 
  Funding: Supported in part by DOE SBIR grant DE-SC0005589
Designing and simulating complex magnet systems needed for cooling channels in both neutrino factories and muon colliders requires innovative techniques to correct for both chromatic and spherical aberrations. Optimizing complex systems, such as helical magnets for example, is also difficult but essential. By using COSY INFINITY, a differential algebra based code, the transfer and aberration maps can be examined to discover what critical terms have the greatest influence on these aberrations.