Abstract
A hybrid single cavity (HSC) linac, combined with radio frequency quadrupole and drift tube structure in a single interdigital-H cavity, operates with high rf power as a prototype injector for cancer therapy synchrotron. The HSC adopts a direct plasma injection scheme (DPIS) with a laser ion source. The input beam current of the HSC is designed to be 20 mA ${\mathrm{C}}^{6+}$ ions. According to simulations, the HSC can accelerate a 6-mA ${\mathrm{C}}^{6+}$ beam which meets the requirement of the particle number for cancer therapy ($1{0}^{8\ensuremath{\sim}9}\text{ }\text{ions}/\text{pulse}$). The HSC injector with DPIS makes the existing multiturn injection system and stripping system unnecessary; what is more, it can also bring down the size of the beam pipe in existing synchrotron magnets, which can reduce the whole cost of the synchrotron. Details of the field measurements of the HSC linac and results of the high power test are reported in this paper.
Highlights
Heavy ion cancer therapy has proved to be a remarkably effective treatment
The hybrid single cavity (HSC) injector with direct plasma injection scheme (DPIS) makes the existing multiturn injection system and stripping system unnecessary; what is more, it can bring down the size of the beam pipe in existing synchrotron magnets, which can reduce the whole cost of the synchrotron
A 65 mm length of exit fringe field (EXITFF) and an alternating phase focusing (APF) structure are adopted for the beam focusing in the end of the radio frequency quadrupole (RFQ) rods and the drift tube (DT) section
Summary
Heavy ion cancer therapy has proved to be a remarkably effective treatment. Its linear accelerator part is over 30 m in length [2], whereas the linear injector length of a new generation of heavy ion cancer therapy facility at Gunma University, which began treatments in 2010, is around 6 m [3]. We aimed to design a compact injection linac that was less than 2 m but had the ability to directly accelerate the high intensity C6þ ion beams by using the direct plasma injection scheme (DPIS).
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More From: Physical Review Special Topics - Accelerators and Beams
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