Dielectric_wall_accelerator
A dielectric wall accelerator (DWA) is a compact linear particle accelerator concept designed and patented[1] in the late 1990s, that works by inducing a travelling electromagnetic wave in a tube which is constructed mostly from a dielectric material. The main conceptual difference to a conventional disk-loaded linac system is given by the additional dielectric wall and the coupler construction.[clarification needed]
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Possible uses of this concept include its application in external beam radiotherapy (EBRT) using protons or ions.