1. A conduction cooling system for at least one linear accelerator cavity, said system comprising:
at least one cavity cooler operatively interconnecting said at least one linear accelerator cavity and a cooling connector,
wherein said at least one cavity cooler and said cooling connector comprise a material having a thermal conductivity no lower
than approximately 1Ã—104 W m?1 K?1 at temperatures of approximately 4 degrees K; and
a refrigeration source operatively connected to said cooling connector.