Author: Nissen, E.W.
Paper Title Page
TUEPPB007 A Self Consistent Multiprocessor Space Charge Algorithm that is Almost Embarrassingly Parallel 1128
  • E.W. Nissen
    JLAB, Newport News, Virginia, USA
  • B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  • S.L. Manikonda
    ANL, Argonne, USA
  Funding: Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
We present a space charge code that is self consistent, massively parallelizeable, and requires very little communication between the computer nodes; making the calculation almost embarrassingly parallel. This method is implemented in the code COSY Infinity where the differential algebras used in this code are important to the algorithm's proper functioning. The method works by calculating the self consistent charge distribution using the statistical moments of the test particles, and converting them into polynomial series coefficients. These coefficients are combined with differential algebraic integrals to form the potential, and electric fields. The result is a transfer map which contains the effects of space charge. This method allows for massive parallelization since its statistics based solver doesn’t require any binning of the particles, and only requires a vector containing the partial sums of the statistical moments for the different nodes to be passed. All other calculations are done independently. The resulting maps can be used to analyze the system using normal form analysis, as well as advance particles in numbers and at speeds that were previously impossible.
TUPPR082 MEIC Design Progress 2014
  • Y. Zhang, Y.S. Derbenev, D. Douglas, A. Hutton, G.A. Krafft, R. Li, F. Lin, V.S. Morozov, E.W. Nissen, F.C. Pilat, T. Satogata, C. Tennant, B. Terzić, B.C. Yunn
    JLAB, Newport News, Virginia, USA
  • D.P. Barber
    DESY, Hamburg, Germany
  • Y. Filatov
    JINR, Dubna, Russia
  • C. Hyde
    Old Dominion University, Norfolk, Virginia, USA
  • A.M. Kondratenko
    Science and Technique Laboratory Zaryad, Novosibirsk, Russia
  • S.L. Manikonda, P.N. Ostroumov
    ANL, Argonne, USA
  • M.K. Sullivan
    SLAC, Menlo Park, California, USA
  Funding: Supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177 and No. DE-AC02-06CH11357.
This paper will report the recent progress in the conceptual design of MEIC, a high luminosity medium energy polarized ring-ring electron-ion collider at Jefferson lab. The topics and achievements that will be covered are design of the ion large booster and the ERL-circulator-ring-based electron cooling facility, optimization of chromatic corrections and dynamic aperture studies, schemes and tracking simulations of lepton and ion polarization in the figure-8 collider ring, and the beam-beam and electron cooling simulations. A proposal of a test facility for the MEIC electron cooler will also be discussed.
THPPP027 The Design of a Large Booster Ring for the Medium Energy Electron-Ion Collider at JLab 3791
  • E.W. Nissen, T. Satogata, Y. Zhang
    JLAB, Newport News, Virginia, USA
  Funding: Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
In this paper, we present the current design of the large booster ring for the Medium Energy Electron-Ion Collder (MEIC) at JLab. The booster ring takes 3 GeV protons or ions of equivalent energy from a pre-booster ring, and accelerates them to 20 GeV for protons or equivalent energy for light to heavy ions before sending them to the ion collider ring. The present design calls for a figure-8 shape of the ring for superior preservation of ion polarization. The ring is made of warm magnets and shares a tunnel with the two collider rings. Acceleration is achieved by warm RF systems. A linear optics has been designed with the transition energy above the highest beam energy in the ring so crossing of transition energy will be avoided. Preliminary beam dynamics studies including chromaticity compensation, analyses of dynamic aperture, working point and high order effects are also presented in this paper.