MOA —  WGA - Deam Dynamics in Rings   (04-Oct-21   10:00—11:00)
Paper Title Page
Theory and Design of Optical Stochastic Cooling  
  • V.A. Lebedev
    Fermilab, Batavia, Illinois, USA
  Optical Stochastic Cooling was recently demonstrated at the IOTA ring in Fermilab. The talk discusses major theory developments required for the implementation of optical stochastic cooling at the IOTA and understanding the experimental results. In addition to previously reported developments, the talk discusses how strong x-y coupling affects the redistribution of cooling rates between horizontal and vertical planes and the how the cooling ranges can be obtained from the measurements when OSC is switched to anti-cooling (heating) regime.  
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Ion Beam Growth Caused by Space-Charge Force of Electron Bunches  
  • S. Seletskiy, A.V. Fedotov, D. Kayran, H. Zhao
    BNL, Upton, New York, USA
  Presence of electron beam created by either electron coolers or electron lenses in an ion storage ring can cause an unwanted emittance growth (heating) of the ion bunches. This electron-ion heating is a result of the electron bunch space-charge force randomized by various effects. In this paper we report experimental studies of the electron-ion heating in the Low Energy RHIC electron Cooler (LEReC) and compare the obtained data to theoretical predictions of several models.  
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MOAC3 Development of an Injection-Painted Self-Consistent Beam in the Spallation Neutron Source Ring 7
  • A.M. Hoover
    UTK, Knoxville, Tennessee, USA
  • N.J. Evans
    ORNL RAD, Oak Ridge, Tennessee, USA
  • T.V. Gorlov, J.A. Holmes
    ORNL, Oak Ridge, Tennessee, USA
  A self-consistent beam maintains linear space charge forces under any linear transport, even with the inclusion of space charge in the dynamics. Simulation indicates that it is possible to approximate certain self-consistent distributions in a ring with the use of phase space painting. We focus on the so-called Danilov distribution, which is a uniform density, rotating, elliptical distribution in the transverse plane and a coasting beam in the longitudinal plane. Painting the beam requires measurement and control of the orbit at the injection point, and measuring the beam requires re- construction of the four-dimensional (4D) transverse phase space. We discuss efforts to meet these requirements in the Spallation Neutron Source (SNS) ring.  
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About • Received ※ 18 October 2021 — Revised ※ 21 October 2021 — Accepted ※ 22 November 2021 — Issue date ※ 02 March 2022
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