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in creator/contributor: "Nelson, B."  
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Plasma Fueling, Pumping, and Tritium Handling Considerations for FIRE

Description: Tritium pellet injection will be utilized on the Fusion Ignition Research Experiment (FIRE) for efficient tritium fueling and to optimize the density profile for high fusion power. Conventional pneumatic pellet injectors, coupled with a guidetube system to launch pellets into the plasma from the high, field side, low field side, and vertically, will be provided for fueling along with gas puffing for plasma edge density control. About 0.1 g of tritium must be injected during each 10-s pulse. The… more
Date: November 13, 1999
Creator: Fisher, P. W.; Foster, C. A.; Gentile, C. A.; Gouge, M. J. & Nelson, B. E.
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Partner: UNT Libraries Government Documents Department
open access

Techniques for Measuring the Composition of Hydrogenated Amorphous Silicon-Germanium Alloys

Description: The authors grow hydrogenated amorphous silicon-germanium alloys by the hot-wire chemical vapor deposition technique at deposition rates between 0.5 and 1.4 nanometers per second. They prepared a set of these alloys to determine the concentrations of the alloying elements as measured by various techniques. This set consists of samples throughout the range of germanium alloying from 0% (a-Si:H) to 100% (a-Ge:H). They find that by making the appropriate calibrations and corrections, their composi… more
Date: October 25, 1999
Creator: Nelson, B. P.; Xu, Y.; Webb, J. D.; Mason, A.; Reedy, R. C.; Gedvilas, L. M. et al.
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Partner: UNT Libraries Government Documents Department
open access

Helium-Cooled Refractory Alloys First Wall and Blanket Evaluation

Description: Under the APEX program the He-cooled system design task is to evaluate and recommend high power density refractory alloy first wall and blanket designs and to recommend and initiate tests to address critical issues. We completed the preliminary design of a helium-cooled, W-5Re alloy, lithium breeder design and the results are reported in this paper. Many areas of the design were assessed, including material selection, helium impurity control, and mechanical, nuclear and thermal hydraulics desig… more
Date: August 1, 1999
Creator: Wong, C. P. C.; Nygren, R. E.; Baxi, C. B.; Fogarty, P.; Ghoniem, N.; Khater, H. et al.
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Partner: UNT Libraries Government Documents Department
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EVOLVE - an advanced first wall/blanket system.

Description: A new concept for an advanced fusion first wall and blanket has been identified. The key feature of the concept is the use of the heat of vaporization of lithium (about 10 times higher than water) as the primary means for capturing and removing the fusion power. A reasonable range of boiling temperatures of this alkali metal is 1200 to 1400 C, corresponding with a saturation pressure of 0.035 to 0.2 MPa. Calculations indicate that a evaporative system with Li at {approximately}1200 C can remove… more
Date: July 21, 1999
Creator: Khater, H.; Majumdar, S.; Malang, S.; Mattas, R. F.; Mogahed, E.; Nelson, B. et al.
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Partner: UNT Libraries Government Documents Department
open access

Anisotropy in Hydrogenated Amorphous Silicon Films as Observed Using Polarized FTIR-ATR Spectroscopy

Description: We used polarized attenuated total reflection (ATR) measurements together with Fourier transform infrared (FTIR) spectroscopy to investigate the vibrational spectra of hydrogenated amorphous silicon (a-SiH{sub x}) films 0.5-1.0 microns in thickness. We deposited the films using hot-wire or plasma-enhanced chemical vapor deposition methods (HWCVD or PECVD, respectively) on crystalline silicon and cadmium telluride substrates. Our ATR technique gave a spectral range from 2100-400 cm{sup -1}, alth… more
Date: May 14, 1999
Creator: Webb, J. D.; Gedvilas, L. M.; Crandall, R. S.; Iwaniczko, E.; Nelson, B. P.; Mahan, A. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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