High-current conduction cooled superconducting radio-frequency cryomodule

A superconducting radio-frequency (SRF) cryomodule for accelerating an electron beam, comprising:

• a vacuum vessel;
• an elliptical SRF cavity within said vacuum vessel;
• two coaxial input power couplers extending through said vacuum vessel and connected to said SRF cavity;
• one or more cryocoolers each having a first stage cold head and a second stage cold head with said second stage cold head of said cryocoolers maintaining a temperature of 4.3-9 K;
• a water-cooled beam pipe higher-order mode absorber for damping of high-order modes;
• a thermal shield;
• a magnetic shield;
• and
• an entrance beam tube and an exit beam tube.

A method for accelerating an electron beam to an electron beam current of at least 1 ampere at an energy of 1 to 10 MeV, comprising:

• providing a superconducting radio-frequency (SRF) cryomodule including a vacuum vessel, an SRF cavity within said vacuum vessel, an coaxial input power coupler extending through said vacuum vessel and connected to said SRF cavity, a cryocooler, an entrance beam tube and an exit beam tube, a thermal shield, a magnetic shield, and a water-cooled beam pipe higher-order mode absorber on said exit beam tube;
• cooling said SRF cavity to between 4.3 K and 9 K with said cryocooler;
• providing said exit beam tube with a greater diameter than said entrance beam tube to damp high-order modes in said SRF cavity;
• further damping high-order modes in said SRF cavity with said water-cooled beam pipe higher-order mode absorber;
• removing infrared heat generated by the SRF cavity with said thermal shield;
• and
• removing magnetic flux lines of interfering magnetic fields with said magnetic shield.