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Wangler, T. P.

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THPAS051 The RIAPMTQ/IMPACT Beam-Dynamics Simulation Package 3606
  • T. P. Wangler, J. H. Billen, R. W. Garnett
    LANL, Los Alamos, New Mexico
  • V. N. Aseev, B. Mustapha, P. N. Ostroumov
    ANL, Argonne, Illinois
  • K. R. Crandall
    TechSource, Santa Fe, New Mexico
  • M. Doleans, D. Gorelov, X. Wu, R. C. York, Q. Zhao
    NSCL, East Lansing, Michigan
  • J. Qiang, R. D. Ryne
    LBNL, Berkeley, California
  Funding: This work is supported by the U. S. Department of Energy, DOE contract number:W-7405-ENG-36

RIAPMTQ/IMPACT is a pair of linked beam-dynamics simulation codes that have been developed for end-to-end computer simulations of multiple-charge state heavy-ion linacs for future exotic-beam facilities. The simulations can extend from the low-energy beam transport after the ECR source to the end of the linac. The work has been performed by a collaboration including LANL, LBNL, ANL, MSU, and TechSource. The code RIAPMTQ simulates the linac front end including the LEBT, RFQ, and MEBT, and the code IMPACT simulates the main superconducting linac. The codes have been benchmarked for rms beam properties against previously existing codes at ANL and MSU. The codes allow high-statistics runs on parallel supercomputing platforms, such as NERSC at LBNL, as well as runs on desktop PC computers for low-statistics design work. We will show results from 10-million-particle simulations of RIA designs by ANL and MSU, carried out at the NERSC facility. These simulation codes will allow evaluations of candidate designs with respect to beam-dynamics performance including beam losses.

FROBC03 Efficient Accelerating Structures for Low-Energy Light Ions 3824
  • S. S. Kurennoy, L. Rybarcyk, T. P. Wangler
    LANL, Los Alamos, New Mexico
  The radio-frequency quadrupole (RFQ) accelerator is the best structure immediately after an ion source for accelerating light-ion beams with considerable currents. On the other hand, the higher-energy part of the RFQ is known to be not a very efficient accelerator. We consider alternative room-temperature RF accelerating structures for the beam velocities in the range of a few percent of the speed of light - including H-mode cavities and drift-tube linacs - and compare them with respect to their efficiency, compactness, ease of fabrication, and overall cost. Options for the beam transverse focusing in such structures are discussed. Possible applications include a compact deuteron-beam accelerator up to the energy of a few MeV for homeland defense.  
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