Abstract
The TRIUMF particle accelerator center in Vancouver, British Columbia, Canada houses a proton therapy beam line formerly used for the treatment of ocular cancer. This existing Proton Therapy Research Centre (PTRC) was upgraded to deliver protons at ultra-high dose rates which would be required for FLASH radiotherapy treatments. A peak dose rate of 110 Gy/s over an area of 20 mm2 was delivered at a beam energy of 21 MeV. This was achieved by degrading the cyclotron extracted beam energy of 70 MeV using polymethyl methacrylate (PMMA) plates. In addition, a fast, versatile and reliable method for producing static ridge filters has been developed to spread the proton beam to the entirety of the target axially (i.e., in depth). FLASH dose rates were maintained with a spread-out Bragg peak of 0.5 cm.
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