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Sandwich targets for heavy-ion experiments

Description: Techniques for producing sandwich targets such as Gd + Pb are described. Better contact between the materials is sometimes assured by evaporating one material onto the other rather than by rolling the two together. Experimental data using both types of targets will be shown.
Date: January 1, 1982
Creator: Thomas, G.E.
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Partner: UNT Libraries Government Documents Department
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Characteristics of various Temescal electron beam sources

Description: Various changes have been made in a Temescal electron beam source to make it more suitable for target preparation. The beam spot size has been made more flexible as well as the accessibility to some of the component parts has been improved. 7 refs., 4 figs.
Date: January 1, 1990
Creator: Thomas, G.E.; Greene, J.P. (Argonne National Lab., IL (USA)); Maier-Komor, P. (Technische Univ. Muenchen, Garching (Germany, F.R.)) & Leonard, R.H. (Florida State Univ., Tallahassee, FL (USA))
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Partner: UNT Libraries Government Documents Department
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Thin film coatings which inhibit spin relaxation of polarized potassium atoms

Description: A prototype of a polarized deuterium target which employs the spin exchange method is being developed. The mixing cell for mixing deuterium atoms and potassium vapor requires a surface that will reflect these atoms without being destroyed by the corrosive potassium. Thin film coating methods and a technique for coating pyrex are described. Results of spin relaxation measurements are given. (LEW)
Date: January 1, 1986
Creator: Thomas, G.E.; Holt, R.J.; Boyer, D.; Green, M.C.; Kowalczyk, R.S. & Young, L.
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Partner: UNT Libraries Government Documents Department
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Isotope targets prepared by vapor deposition

Description: As the state of the art for producing thin films has developed, the parameters set by the experiments have in turn become more stringent. Often these targets must be of high purity, extremely thin, self-supporting, and of accurately determined thickness. In addition, the target material may be an expensive isotope which must be reduced to elemental form at the time of vapor deposition. Methods of producing some of these targets will be discussed with such examples as calcium, magnesium and boro… more
Date: January 1, 1980
Creator: Thomas, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Carbon stripper foils for heavy-ion accelerators

Description: Carbon stripper foils have for many years been successfully used with accelerators because they yield higher average charge states than gas strippers. However, with the development of heavy ion accelerators and the resulting use of heavier ions, the carbon stripper foil lifetimes are greatly reduced. Even when using the new foils changer systems, which typically contain two hundred foils or more, it becomes necessary to have frequent accelerator shutdowns for foil reloading. The rate of experim… more
Date: January 1, 1980
Creator: Thomas, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New techniques for producing thin boron films

Description: A review will be presented of methods for producing thin boron films using an electron gun. Previous papers have had the problem of spattering of the boron source during the evaporation. Methods for reducing this problem will also be presented. 12 refs., 4 figs.
Date: January 1, 1988
Creator: Thomas, G.E.
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Partner: UNT Libraries Government Documents Department
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Evaluation of target purity using various vacuum systems

Description: Gold targets were prepared under various conditions using both a cryopump and a conventional diffusion pump evaporator system. Measurements were made at the Argonne Tandem Accelerator system to determine the purity of these targets.
Date: January 1, 1984
Creator: Thomas, G.E.; Rehm, K.E. & Klimczak, G.W.
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Partner: UNT Libraries Government Documents Department
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Target vacuum storage facility

Description: A storage facility was constructed and is now in operation for use with targets which must be kept in a vacuum. The storage chamber of this facility will handle up to ninety targets at a pressure of 5 x 10$sup -7$ torr. Typically, targets are evaporated, moved into a small transfer chamber, and then placed in the storage chamber of the facility--all under vacuum. There are safety devices which minimize accidents. (auth)
Date: January 1, 1975
Creator: Worthington, J.N.; Jedlowski, R.J. & Thomas, G.E.
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Partner: UNT Libraries Government Documents Department
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Preparation of calcium-separated isotope targets using small samples

Description: Targets are routinely evaporated using a few milligram quantities of separated isotopes of calcium with reducing agents. The source to target distance is 3.0 cm with the substrate, if necessary, as thin as 15 $mu$g/cm$sup 2$ carbon or 100 $mu$g/cm$sup 2$ of gold. A tantalum closed boat, heat shield, and special collimator system are used. (auth)
Date: January 1, 1975
Creator: Thomas, G.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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