Technical manual for continuous flow LHe4 cryopump J.N. 2977

This report concerns the operation and maintenance of the liquid helium condensation cryopump system built for and in collaboration with the Air Force Geophysics Laboratory at Hanscom AFB. The first section briefly describes the theory of operation and discusses the precautions that should be taken when using the system. The second section describes the system and assembly procedures. The third section explains how to use the storage dewar. The fourth section describes the operating procedure of the cryopump. In the fifth section troubleshooting and maintenance procedures are explained. All relevant drawings and tables are included in the sixth and last section.