Report discussing experiments conducted under the Livermore "Waldo" project to determine "(1) surface densities attainable in a supersonic mercury vapor jet stream, (2) the approximate efficiency of a mercury jet for neutralizing a proton beam, and (3) the mercury partial pressure contribution in the bore due to side streaming from the mercury jet."

The special study group was activated by a charter letter from Sub-Section Managers of Pile Technology on June 20, 1956. The principal objectives were: to collect the information which is presently available for new reactor design and to determine what information should be developed; to make a guess at pile variables; and to point out development programs which must be pursued to achieve a detailed design start in two years. The study was restricted to graphite moderated reactors with H{sub 2}0, D{sub 2}0, and organic coolants. The program was to determine technical feasibility only and detailed economic considerations were not to be included. This report presents the conclusions of the group and some of the reasoning behind these conclusions.

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