Cryogenic distribution system

Nuclear Science Centre (NSC) is currently building a superconducting linear accelerator (LINAC) using niobium cavities which will act as a booster for the ion beams ejected from existing pelletron. To keep the superconducting cavities cool below its critical temperature (T-c = 9.2 K for the niobium) liquid helium (boiling paint 4.5K @ 16 psia) would be used. In this direct ion an effective plan for cryogenic liquid (both liquid helium and liquid n itrogen) distribution to the cavities has been worked out. This paper descr ibes the details of cryogenic distribution system in terms of design, the o perational aspects and fabrication methodology.