The CEBAF Cavity Cryostat

The modular design of the linac cryostat system based on a cavity-pair is presented.Description of the cryogenic module consisting of four cavity-pairs is included.The methods of making a cavity-pair hermetic during cryostat assembly, introducing the waveguides, supporting the helium vessels and introducing instrumentation are presented.Also included are the methods of tuning the cavities, aligning them to exterior references and connecting cryogenic fluid circuits to adjacent modules and transfer lines