1. An accelerator comprising:at least one accelerator cavity;
an electron gun;
at least one thermally conductive cavity cooler configured to be in thermally conductive contact with said accelerator cavity;
a refrigeration source connected to a cold tip, said refrigeration source configured to conduct thermal energy away from said cold tip; and
a cooling connector connected to said cold tip and connected to said cavity cooler, wherein said cooling connector provides a thermally conductive connection between said cold tip and said cavity cooler.