We have developed and installed two accelerator-based cold neutron sources within a electron linac at Hokkaido University and a proton synchrotoron at National Laboratory for High Energy Physics. Solid methane at 20K was adopted as the cold moderator. The methane condensing heat exchangers attached directly to the moderator chambers were cooled by helium gas, which was kept cooled in refrigerators and circulated by ventilation fans. Two cold neutron sources have operated smoothly and safely for the past several years. In this paper we describe some of the results obtained in the preliminary experiments by using a modest capacity refrigerator, the design philosophy of the cooling system for the pulsed cold neutron sources, and outline of two facilities.
An outline of the Superconducting Super Collider (SSC) project, a 20TeV on 20TeV proton-proton collider, is given. The SSC will have immense potential for major advances in understanding the nature of matter. Background information and specifications for the three different types of superconducting magnet with emphasizing various magnetic fields (low field option 3T, medium field option 5T, high field option 6.5T) are provided. Also discussed are specific R & D needs of the SSC project.