Keyword: cyclotron
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TUA1CO04 Simulation of Beam Dynamics in a Strong Focusing Cyclotron ion, cavity, space-charge, focusing 251
  • P.M. McIntyre, J. Gerity, A. Sattarov
    Texas A&M University, College Station, USA
  • S. Assadi
    HiTek ESE LLC, Madison, USA
  • K.E. Badgley
    Fermilab, Batavia, Illinois, USA
  • N. Pogue
    LLNL, Livermore, California, USA
  Funding: This work is supported by the US Dept. of Energy Accelerator Stewardship Program.
The strong-focusing cyclotron is an isochronous sector cyclotron in which slot-geometry superconducting half-cell cavities are used to provide sufficient energy gain per turn to fully separate orbits and superconducting quadrupoles are located in the aperture of each sector dipole to provide strong focusing and control betatron tune. The SFC offers the possibility to address the several effects that most limit beam current in a CW cyclotron: space charge, bunch-bunch interactions, resonance-crossing, and wake fields. Simulation of optical transport and beam dynamics entails several new challenges: the combined-function fields in the sectors must be properly treated in a strongly curving geometry, and the strong energy gain induces continuous mixing of horizontal betatron and synchrotron phase space. We present a systematic simulation of optical transport using modified versions of MAD-X and SYNERGIA. We report progress in introducing further elements that will set the stage for studying dynamics of high-current bunches.
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TUPOA10 Cyclotrons for Accelerator-Driven Systems ion, proton, neutron, target 305
  • T.-Y. Lee, J. Lee, S. Shin
    PAL, Pohang, Kyungbuk, Republic of Korea
  • C.U. Choi, M. Chung
    UNIST, Ulsan, Republic of Korea
  Accelerator-Driven system (ADS) can transmute long lived nuclear waste to short lived species. For this system to be fully realizable, a very stable high energy and high power proton beam (typically, 1 GeV beam energy and 10 MW beam power) is required, and preparing such a powerful and stable proton beam is very costly. Currently, the most promising candidate is superconducting linear accelerators. However, high power cyclotrons may be used for ADS particularly at the stage of demonstrating proof of principle of ADS. This paper discusses how cyclotrons can be used to demonstrate ADS.  
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THB3CO03 Thermoacoustic Range Verification for Ion Therapy ion, proton, target, cavity 1265
  • S.K. Patch, Y.M. Qadadha
    UWM, Milwaukee, Wisconsin, USA
  • R. Albright, P. Bloemhard, K. Campbell, A.P. Donoghue, T.L. Gimpel, A. Jackson, M.B. Johnson, M. Kireeff Covo, B. Ninemire, L. Phair, C.R. Siero, S.M. Small
    LBNL, Berkeley, California, USA
  Funding: We acknowledge support from a UWM Intramural Instrumentation Grant and by the Director, Office of Science, Office of Nuclear Physics, of the U.S. Dept. of Energy under Contract No. DE-AC02-05CH11231.
The potential of particle therapy due to focused dose deposition in the Bragg peak has not yet been fully realized due to inaccuracies in range verification. We report correlation of the Bragg peak location with target structure, by overlaying thermoacoustic localization of the Bragg peak onto a standard ultrasound image. Pulsed delivery of 50 MeV protons was accomplished by a fast chopper installed between the ion source and the inflector of the 88" cyclotron at Lawrence Berkeley National Lab. 2 Gy were delivered in 2 μs by a beam with peak current of 2 μA. Thermoacoustic emissions were detected by a clinical ultrasound array, which also generated a grayscale ultrasound image. Data was collected in a room temperature water bath and gelatin phantom with a cavity designed to mimic the intestine, where gas pockets can displace the Bragg peak. Experiments were performed with the cavity both empty and filled with olive oil. In the waterbath overlays of the Bragg peak agreed with Monte Carlo simulations to within 800±170 μm. Agreement within 1.3 ± 0.2 mm was achieved in the gelatin phantom, for which stopping power was estimated to first order from CT scans.
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