Author: Makino, K.
Paper Title Page
MOPPT019 A Compact, GeV, High-Intensity (CW) Racetrack FFAG 73
  • C. Johnstone
    Fermilab, Batavia, Illinois, USA
  • M. Berz, K. Makino
    MSU, East Lansing, Michigan, USA
  • P. Snopok
    Illinois Institute of Technology, Chicago, Illinois, USA
  High-intensity and energy compact proton accelerators, especially those requiring milliamp currents, imply both CW operation and high acceleration gradients to mitigate losses. Above a few hundred MeV, losses must be under a per cent to avoid massive shielding and unmanageable activation. As relativistic energies are approached, the orbit separation on consecutive acceleration turns decreases for isochronous performance and to achieve higher acceleration gradients and orbit separation, RF modules must be employed rather than Dees, resulting in the larger separated-sector cyclotron footprint. However, the addition of strong focusing – with reversed gradients to capture both transverse planes – to conventional cyclotron fields promote inclusion of long synchrotron-like straight sections and implementation of high-gradient RF, even SCRF. The nsFFAG design has evolved into a a recirculating linear accelerator form with FFAG arcs. An ultra-compact, 0.2 – 1 GeV RLA FFAG design will be discussed (with a 3m x 5-6m footprint) that uses SC RF cryomodules achieving complete orbit separation at extraction and CW operation.