A vacuum pumping system that provides a cryo surface for condensing and freezing of H/sub 2/ gas is described. A closed-loop vacuum system was designed and built at Lawrence Livermore Laboratory to pump down the neutralizer LH/sub e/ dewar with a volurae of 350 l and the lambda point dewar with a LH/sub e/ volume of 250 l. Both of these dewars can be pumped down simultaneously or one at a time. 100% of the H/sub e/ gas is recovered free of contaminations. The vacuum pump can handle 340 SCFM of gas. The LH/sub e/ dewars are pumped down below the lambda point. This condition reduces the LH/sub e/ container wall temperature to 2.1 deg K giving a base pressure of 10/sup -13/ torr for H/sub 2/ gas/sup 2/. To attain a stable condition the LH /sub e/ baths are puuped down to 33 torr or lower to give a surface temperatare of about 2/sup 0/K/sup 3/. The Baseball II helium factlity is a close loop system. The H/sub e/ gas is recovered from all the LH/sub e/ usage point. This gas is accumulated in one of the two 8000 cu ft inflatable gas bags. The gas from the gas …

Recent efforts in controlled fusion experiments have indicated the need for large neutral-beam sources to provide an initial plasma for further plasma buildup, for use as a stoking source to makeup losses, or for plasma heating. Experiments now operating or envisioned for the near future anticipate the need for kilo-amp neutral beams in the 20-keV energy range and higher. These sources will be required to focus into relatively small-volume targets, have good gas efficiency, and use a minimum of excess gas for downstream neutralization. A test facility with sufficient pumping capacity to handle sources of this size is described. The ion source, mockup extraction grid, and the requisite electronic and power equipment for a 200-amp neutral-deuterium beam are discussed. The beam pulse length will be from 2 to 10 msec. (auth)

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The linear Scyllac theta-pinch machine required mirror coils on each end of the 5-m-long lead coil, which would give mirror ratios of two to three times the 100-kG main coil magnetic field. A pulsed magnetic field of 250 RG was established as a design goal for the mirror coils. Several different designs were evaluated using the 178- kJ, 80-kV Scyllac prototype capacitor bank. Calculations were made to determine the coil geometry for each 250-kG cotl design. A copper-lined, steel-jacketed coil, and an all steel coil were fabricated and tested (4 to 5 cm bores). The types of materials selected for each coli, strength considerations, and fabricating techniques are discussed. The final design of the mirror coils for the 11.2-cm-bore Scyllac machine was established using an all-steel (Maraging type 250) design. An aluminium coil (2014-T652) was built and tested to failure in order to establish data as to the maximum fields that aluminum coils could be subjected to in a typical pulsed theta-pinch evironment. This program and conclusions are discussed. (auth)

The design of the 2XII-B pulse coil system is presented. Development of the coil geometry is given as well as the results of magnetic field calculations. A discussion of the forces developed by this high-energy coil set and the electrical stress on the magnet insulation is presented. The results of materials selection for both the coil insulation and structure are included, and also a description of the fabrication procedure. (auth)

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From American Institute of Biological Sciences meeting; Amherst, Massachusetts, USA (21 Jun 1973).

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A program for evaluation of precipitation scavenging as a mechanism of removal of contaminants from power plant plumes has been in progress. This program began with field studies at the Keystone plant in Western Pennsylvania, which led to the development of new gas-washout models and related field studies at other locations. The progress of this program is described and some comparisons of measured SO/sub 2/ washout concentrations with those predicted by reversible and irreversible gas washout models are presented. Recommendations for application of the gas-washout models for environmental impact analysis are made. (auth)

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From 19th annual analytical chemistry conference; Jackson Hole, Wyoming, USA (3 Sep 1973). An alpha spectroscopy system for analysis of environmental samples at Rocky Flats is described. The system consists of 16 silicon detectors and associated electronics (preamplifiers, amplifiers, multiplier/router, analog- to-digital convcrter, pulseheight analyzer) for input in a NOVA 1200 minicomputer with 24 K, 16 bit memory. Software is briefly discussed. (WHK)

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A new analytical mechanism for distributing air sampling locations around nuclear facilities, including reactors, fuel fabrication, fuel reprocessing and research centers, has been devised. This method was developed to facilitate the efficient incorporation of past experiences into environmental surveillance programs for now or developing installations. The technique provides an initial distribution of air samplers around a site which correlates well with placements on sites which have been occupied by long established programs with their inherent evolution and refinements. The applicability of this approach has been examined by comparing sampling locations in well-established air monitoring programs scattered worldwide with location distributions recommended by this mechanism. Results of these comparisons will be detailed.

From 5th symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). Due to space limitations on the windings, the power efficiencies of toroidal field coils for tokamak experiments are in general rather poor. Very substantial improvement can be achieved by using asymmetrical magnet coil designs. The results of mathematical analysis and electric-current-flow plotting for various types of asymmetrical coil designs are discussed, and numerical data of resistance measurements with the High-Field ORMAK prototype coil are given. (auth)

From 2nd internationnl conference on elementary particles; Aix-en- Provence, France (6 Sep 1973). A formation type experiment made in a heavy liquid bubble chamber for the channel K/sup -/p yields SIGMA /sup o/ pi /sup o/ in the 1575 to 1750 M eV cm energy range is considered. From the results containing ~2/3 of the statistics, essentially the total and differential cross sections for this channel are presented and compared with the results of a hydrogen BC experiment made by a CHS collaboration, where the SIGMA /sup o/ pi / sup o/ channel was studied indirectly. (auth)

From 5th sympostum on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). Results of analyses of the tritium distribution and leakage characteristics for two current fusion power reactor designs -the Princeton Reference Model Tokamak and the LASL/ANL Reference Theta Pinch Reactor--are presented and compared. The philosophy of the model used in these analyses is discussed, and the computer code, developed to carry out the calculations, is described. Consideration is given to the practical aspects of those design features which have the greatest influence on tritium inventories and leakage rates; i.e., (1) the blanket and fuel processing systems, (2) the protective atmospheres, and (3) the application of some special materials as tritium barriers. The results of these analyses have permitted several interesting comparisons to be made between a molten salt-stainless steel reactor design (the Princeton Tokamak model) and a liquid lithiumrefractory metal reactor design (the LASL/ANL Theta-Pinch model). (auth)

as a basis for classiftcation of clays and for tracing the origin of the parent materials used in pottery manufacturing, Nine pottery specimens were analyzed as a very preliminary test of the potential of correlation between clay and pottery compositions. (LK)

Neutron activation analysis and emission spectroscopy were used to analyze ancient Egyptian glass. The emission spectroscopic method for determining Li, Na, K, Rb, Mg, Ca, Sr, Ba, B, Al, P, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Ag, Sn, Sb, Pb, and Bi is described in the appendix. Neutron activation was used to determine Na, K, Rb, Ba, Sc, La, Ce, Eu, Lu, Hf, Th, Ta, Cr, Fe, Co, and Sb by a method described by Tobia and Sayre at the conference. (DHM)