The cavity design for the large ring of the proposed synchrotron light source is being considered. It represents the worst case situation in all respects so that a similar design for the small ring will face no problems. Basic requirements are that the cavity provide a peak gap voltage of up to 500 kV at a frequency of 53.52 MHz. Sufficient tuning range must be provided to allow for the reactive detuning of the beam and also thermal changes. Provisions for phase and amplitude control of two cavities operating together must also be available and attention must be given to possible higher order mode excitation at frequencies which are harmonically related to the operating frequency and also to some degree the 2.23 MHz rotation frequency. There are also space limitations imposed by the chosen magnet lattice and the need for a beam wiggler in the same straight section as the rf cavity. The practical upper limits of cavity diameter and length are about 1.25 m and 1.7 m, respectively.

Along the general run of the vacuum chamber synchrotron radiation strikes the wall at a glancing angle of about 5.6/sup 0/. The heat source is well-approximated by a ribbon of uniform power density having a small vertical height and an infinite azimuthal length. The heat transfer problem reduces to one in two-dimensions and it has been considered in a previous note. At the corner of a beam port the angle of incidence becomes 90/sup 0/, so the temperature rises much higher than elsewhere. Since the power density at the corner is not uniform in its azimuthal dependence, but is strongly peaked at the point of normal incidence, two-dimensional heat flow is not a good approximation. The rectangular 3d problem is considered. This is easily solved and yields a good first estimate of the temperature rise at the corner.

A critical review of U.S. and foreign literature on the use of a mixture of refrigerants rather than a single one in a refrigeration unit indicates that energy can be conserved in properly arranged systems. An independent analytical study performed under the current contract using a 50% mixture of R-12 and R-114 in a two-evaporator refrigerator typical of domestic refrigerators showed an energy saving of 12%. The cycle explored was a non-optimized one, so greater energy savings are theoretically possible. The application of refrigerant mixtures to domestic refrigerators would not be a panacea, but would require a redesign of the refrigeration circuit and a resizing of the compressor. There would be a number of problems to be explored and solved before a successful application could be achieved, but the prospects look favorable at this time. One of the most useful next steps would be to continue to expand the knowledge base on refrigerant mixtures that would be made available to the manufacturers of refrigerators.

This standard establishes the requirements for fabrication, testing, and inspection of control rod assemblies for use in liquid metal fast breeder reactors.

The Morgantown Energy Technology Center (METC) is developing the technology required to recover the deep thin seam Eastern bituminous coal resource by gasification in-situ. The approach is to prove concepts through field tests and to support field testing-with theoretical modeling. METC is currently fielding Pricetown I, the first of two tests scheduled for the Pricetown, West Virginia, underground coal gasification field test. Pricetown I is a small-scale test designed to provide information concerning the in-situ characteristics of the Pittsburgh coal seam; to gain additional experience in the in-situ combustion and gasification of bituminous coal; and to evaluate the functional applicability of the linked vertical concept to recover the Eastern resources. Mound Facility is participating with METC in the design and the implementation of the instrumentation necessary to monitor the surface and subsurface process and product gas stream; and acquire real-time gas analysis and subsurface thermal data. The principal objective of this effort is to provide an integrated instrumentation system that will permit rapid automatic monitoring of subsurface and surface variables and to ensure data storage, retrieval and reduction for process monitoring and results interpretation. Mound also will support METC with the manpower and technical assistance necessary to operate the field …