Superconducting linac beam dynamics with high-order maps for RF resonators

Andrew A. Geraci*, Jerry A. Nolen, Richard C. Pardo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The arbitrary-order map beam optics code COSY Infinity has recently been adapted to calculate accurate high-order ion-optical maps for electrostatic and radio-frequency accelerating structures. The beam dynamics of the superconducting low-velocity positive-ion injector linac for the ATLAS accelerator at Argonne National Lab is used to demonstrate some advantages of the new simulation capability. The injector linac involves four different types of superconducting accelerating structures and has a total of 18 resonators. The detailed geometry for each of the accelerating cavities is included, allowing an accurate representation of the on- and off-axis electric fields. The fields are obtained within the code from a Poisson-solver for cylindrically symmetric electrodes of arbitrary geometry. The transverse focusing is done with superconducting solenoids. A detailed comparison of the transverse and longitudinal phase space is made with the conventional ray-tracing code LINRAY. The two codes are evaluated for ease of optimization, with particular attention to higher-order effects, and future applications are discussed.

Original languageEnglish (US)
Pages (from-to)388-395
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
StatePublished - Feb 21 2004
EventProceedings of the Sixth International Conference on Charged (CPO) - Greenbelt, MD, United States
Duration: Oct 21 2002Oct 25 2002


  • Beam optics
  • High-order maps
  • Superconducting linacs

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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