The longitudinal electromagnetic interaction of an intense coasting beam with itself, including the effect of a resistive vacuum tank, is investigated theoretically. It is shown that even in the range where the particle frequency is an increasing function of particle energy, the beam can be longitudinally unstable due to the resistivity of the vacuum tank walls. In the absence of frequency spread in the unperturbed beam the beam is shown to be always unstable against longitudinal bunching with a growth rate which depends upon (N/{sigma}){sup 1/2}, where N is the number of particles in the beam and {sigma} is the conductivity of the surface material. By means of the Vlasov equation, a criterion for stability of the beam is obtained; and shown in the limit of high-conductivity walls to involve the frequency spread in the unperturbed beam, the number of particles N, the beam energy, geometrical properties of the accelerator, but not the conductivity {sigma}. A numerical example is presented which indicates that certain observations of beam behavior in the MURA 40 MeV electron accelerator may be related to the phenomena investigated here.

The purpose of this letter is to outline the immediate and long-range plans for increasing the H Reactor coolant flow. The flow can be increased, immediately from the present base of about 84,000 gpm to about 88,000 gpm via the following changes: routine purges; use of non-bumpered fuel; increasing the flow through Fringe enrichment and Fringe Poison tubes by changing orifices; and reaming damaged rear fittings to their original size. The flow can be increased to about 94,000 gpm via the following changes: installing larger Venturis throughout the reactor; reaming rear fittings to a larger size; installing rear nozzles that permit higher tube flows; charging I&E Poison elements in Fringe tubes; and some changes in the water pumping facilities may be necessary.

Since transducers used in rocket engine applications measure time varying quantities, the characteristics which define the behavior of a transducer under dynamic conditions are extremely important in their applications by the design engineer. Proper calibration of transducers in the dynamic or frequency domain required a thorough understanding of the dynamic or frequency domain required a thorough understanding of the dynamic characteristics of a transducer. Analytical models are generated in his report, and the techniques based on these models for determining frequency response are discussed.

A description is given of the preparation and properties of a granular form of potassium hexacyanocobalt(II) ferrate(II) that is a highly selective absorbent for cesium ion. The material is suitable for use in a large-scale icn exchange column, and offers the possibility of isolating and concentrating Cs from the fission product waste solutions which arise from the processing of nuclear fuels. (auth)