MO-A-213AB-02: Redesign of a 6 MV Linear Accelerator Waveguide to Produce Energies Up to 10 MV

Medical Physics
D BaillieS Steciw

Abstract

To investigate the feasibility of producing a short, high-energy linear accelerator for use in a proposed hybrid linear accelerator magnetic resonance imager (linac-MRI). A short 6MV waveguide was previously simulated in COMSOL and benchmarked against experiment. The simulated input power is increased from 2.5 to 7.5 MW to reflect replacing the magnetron power source with a commercially available klystron, and the RF fields within the waveguide are calculated. The RF solution is used as an input into PARMELA, an electron-tracking software, to calculate the electron energy and spatial distribution exiting the waveguide. The electric fields within the waveguide are compared with experimental thresholds for electric breakdown within the waveguide to determine the possibility of operation at increased input power. The energy spectrum of the electron beam incident on the target is analyzed for suitability for radiotherapy. Finally, some potential modifications to the simulated cavity dimensions and positioning are discussed, and a preliminary estimate of the effects on the electron distributions are analyzed. When the input power is increased, peak surface electric fields within the waveguide of 215 MV/m are calculated, below the th...Continue Reading

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