The purpose and requirements of the Spallation Neutron Source (SNS) and the target area of the Muon Collider/Neutrino Factory are presented. Parts of the technologies that are being utilized to design these facilities are discussed. Emphasis is given to the technology issues that present the greatest scientific challenges. SPALLATION NEUTRON SOURCE In many areas of physics, chemistry, biology, materials, and nuclear engineering, it is extremely valuable to have a very intense source of neutrons

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... so that the structure and functionality of materials can be studied. Discussions on all the Spallation Neutron Sources under consideration or development are given in Refs. 1-3. One facility under construction at ORNL for this purpose is the Spallation Neutron Source (SNS). This facility will consist basically of three parts: 1) a high-energy (-1 GeV) and high-powered (< 2 MW) proton accelerator (60 Hertz, <1.0 us/pulse, <33 kJ/pulse), 2) a target/moderator/reflector/ shielding/shutter/utility [Target Systems (TS)] assembly, which converts part of the proton beam power to low-energy (< 2eV) neutrons through spallation and delivers them to the third part, 3) the neutron scattering instruments. A picture showing the overall facility is given in Fig. 1 . LBNL is responsible for the front end, which is currently being shipped to ORNL for installation; LANL/JLAB, the linac [parts of the Drift Tube Linac (DTL) and klystrons have been shipped to ORNL for installation]; BNL, the highenergy beam transport system and accumulator ring; ORNL, Target Systems and Conventional Facilities; and ANL, the neutron scattering instruments. Abstract. The purpose and requirements of the Spallation Neutron Source (SNS) and the target area of the Muon Collider/Neutrino Factory are presented. Parts of the technologies that are being utilized to design these facilities are discussed. Emphasis is given to the technology issues that present the greatest scientific challenges.