Keyword: longitudinal-dynamics
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MOOBS3 Bunch-End Interpenetration During Evolution to Longitudinal Uniformity in a Space-Charge-Dominated Storage Ring simulation, space-charge, electron, diagnostics 22
 
  • T.W. Koeth, B.L. Beaudoin, S. Bernal, I. Haber, R.A. Kishek, P.G. O'Shea
    UMD, College Park, Maryland, USA
  
  The University of Maryland Electron Ring is a facility for study of the novel physics that occurs as intense space-charge-dominated beams that are transported over long distances. An example presented here is the role of space-charge longitudinal expansion and bunch-end interpenetration in the relaxation of a coasting bunch towards uniformly filling the ring. By comparing experiment to simplified longitudinal simulations the relaxation process is shown to be largely independent of details of the transverse dynamics. However, to get detailed agreement it was found necessary to include the consequences of transverse current loss. Since the AC coupled diagnostics lose information on any DC current loss, a novel beam knockout technique was developed to recover this information.  
slides icon Slides MOOBS3 [2.501 MB]  
 
MOP047 Helical Channels with Variable Slip Factor for Neutrino Factories and Muon Colliders simulation, solenoid, collider, target 187
 
  • C. Y. Yoshikawa, C.M. Ankenbrandt
    Muons, Inc, Batavia, USA
  • D.V. Neuffer, K. Yonehara
    Fermilab, Batavia, USA
  
  Funding: Supported in part by DOE SBIR grant DE-SC0002739.
In order to realize a muon collider or a neutrino factory based on a muon storage ring, the muons must be captured and cooled efficiently. For a muon collider, the resulting train of bunches should be coalesced into a single bunch. Design concepts for a system to capture, cool, and coalesce a muon beam are described here. In particular, variants of a helical channel are used, taking advantage of the ability to vary the slip factor and other parameters of such a channel. The cooling application has been described before; this paper reports recent studies of a system that includes two novel concepts to accomplish capture and coalescing via a slip-controlled helical channel. 		 
 
WEP080 Spin Tracking with GPUs to 250 GeV in RHIC Lattice resonance, acceleration, lattice, quadrupole 1624
 
  • V.H. Ranjbar
    Tech-X, Boulder, Colorado, USA
  • M. Bai, F. Méot
    BNL, Upton, Long Island, New York, USA
  
  Funding: Supported by DOE NP grant DE-SC0004432
We have benchmarked UAL-SPINK against Zgoubi and a list of well understood spin physics results. Along the way we addressed issues relating to longitudinal dynamics and orbit bump and distortion handling as well as appropriate slicing necessary for the TEAPOT-SPINK spin orbit integrator. We have also ported this TEAPOT-SPINK algorithm to the GPU’s. We present the challenges associated with this work. 		 
 
THP127 Analysis of NSLS-II Touschek Lifetime betatron, simulation, synchrotron, closed-orbit 2360
 
  • J. Choi, S.L. Kramer
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by DOE contract DE-AC02-98CH10886
As scrapers are adopted for the loss control of NSLS-II storage ring, Touschek lifetime estimations for various cases are required to assure the stable operation. However, to estimate the Touschek lifetime, momentum apertures should be measured all along the ring and, if we want to estimate the lifetime in various situations, it can take extremely long time. Thus, rather than simulating for each case, semi-analytic methods with the interpolations are used for the measurements of the momentum apertures. In this paper, we described the methods and showed the results.