This is a study of the effect of core electron and plasma screening on Bremsstrahlung from high-Z impurities in hot plasmas. 3 refs., 7 figs., 1 tab.

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The Separations Technology Laboratory was requested to characterize solids, removed as a slurry, from cleanout of Tank C6A last month. For some time, solids had been appearing in samples taken from this tank. The analytical evidence from this study shows the solids, although principally plutonium and aluminum, to be a complex mixture, stoichiometrically. The solids have likely been forming over the past few years due to conditions leading to insolubility, primarily of aluminum nitrate, in Tank C6A. This mode of formation is probably responsible for the larger particles. Since aluminum nitrate crystals can be highly hydrated, small quantities of plutonium could have been carried along from the 150--200 g Pu/L mother liquor. The smaller particles could have formed in the same manner, but since they contain more plutonium than the larger ones, they could have originated in upstream processing from C6A and have been fine enough to either bypass filtration or be passed along during line breaks to change filters or for other maintenance. Routinely scheduled inspection and/or cleanout is recommended to prevent further buildup of solids in such process vessels.

In the final design of the DO Detector, the three cryostats (CC and both EC's) will ride on a pair of hardened ways so as to move the EC's out and away from the CC cryostat to provide access between cryostats for repairs and such. Each of the cryostats sits on a carriage which has a pair of Tychoway rollers placed at each corner to roll on the hardened ways. When in position, the full weight of the cryostats is to be relieved from the rollers with the use of a pair of 90-ton jacks flanking the pair of rollers at each corner. Due to confined space, these jacks had to be custom made, triple cylinder, single block units. Five manufacturers were presented with the problem and three came back with proposals. All three satisfied the technical requirements but Ram-Pac International was easily the lowest priced.

The installation of flow restricting orifices in both the nitrogen gas and instrument air supply lines in the D-Zero Building limits the flow available to the various users. These orifices are strategically positioned along the lines such that no one user can monopolize the gas supply and deprive others of their flow required to operate. Provided that the necessary orifice plates are machined in a manner similar to that of the prototypes, the orifices for the various lines were sized using the discharge coefficient for the round edge orifice because the calculated values were in good agreement with the empirically obtained values for this case. The final calculated orifice diameters for the round edge, sharp edge, and short tube cases are listed in Table 2.

The Alcator C bolometer array has been modified to be compatible with electron cyclotron heating on the Microwave Tokamak Experiment. Fine wire mesh screens are mounted on the front of the bolometer collimator tubes to attenuate microwave heating of the bolometers. Structural changes eliminate openings in the seams of the bolometer housing, which represent pathways for microwaves to enter the system. This paper outlines the operational principles of the bolometer system, discusses the measured and predicted performance characteristics of the bolometer array, and includes a concise guide to the operation of the bolometer controller. 5 refs., 5 figs., 1 tab.

Information on the applicants to the Texas Academy of Mathematics and Science for the 1988 fall semester.

Report from the Texas House Special Committee On Businesses Owned By Women or Minorities describing the group's goals, activities, accomplishments, and other information, for review by the 71st Texas Legislature.

Final report containing the findings of the Joint Select Committee on Workers' Compensation Insurance regarding the workers' compensation system of Texas. The report also contains staff recommendations regarding workers' compensation, its benefits, and the adjudication of disputes.

Presently the D/null/ detector has three big toroidal magnets; one Central Toroid (CF) and two End Wall Toroids (EF). The EF toroids have central openings 72'' x 72''. Originally, this opening was meant for possible future end-plug calorimeters. Instead we are now designing Small Angle Muon Spectrometer (SAMUS) for the opening. The major component will be built at Serpukhov. The design of the toroid magnets and its magnetic field calculations is being done by exchanging information between Serpukhov and Fermilab. 2 refs., 4 figs., 1 tab.