Author: Bromberg, L.
Paper Title Page
Status of the Development of a Fully Iron-free Cyclotron for Proton Beam Radiotherapy Treatment  
  • D. Winklehner
    MIT, Cambridge, Massachusetts, USA
  • L. Bromberg, J.V. Minervini, A. Radovinsky
    MIT/PSFC, Cambridge, Massachusetts, USA
  Funding: This work was supported by the US Department of Energy under award number DE-SC0013499.
Superconducting cyclotrons are increasingly employed for proton beam radiotherapy treatment. The use of superconductivity in a cyclotron design can reduce its mass by an order of magnitude and size by a factor of 3-4 over conventional resistive magnet technology, yielding significant reduction in overall cost of the device, the accelerator vault, and its infrastructure. In the presented work, we go a step further and remove the iron yoke, generating the magnetic field with a combination of superconducting coils only. Eliminating the iron yoke has two key benefits. First and foremost, the overall weight can be reduced by almost another order of magnitude. Secondly, eliminating all magnetic iron from the flux circuit results in a linear relationship between field and coil current, which allows smooth scaling of the magnetic field and thus the output energy, thereby removing the need for a degrader. Here we describe the status of the design of such an iron-free cyclotron, currently under development at the Plasma Science and Fusion Center at MIT, with coil and cryostat calculations as well as beam dynamics studies and treatment plan considerations pertaining to this type of cyclotron.
slides icon Slides TUB01 [5.954 MB]  
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