13 Matching Results

Search Results

Results: 1 - 13
open access

High energy negative deuterium beams using double charge-exchange or surface production

Description: Experimental and theoretical research on production of negative ion beams is described. Results from a double charge-exchange experiment include 10 ms pulses of 100 ma of D/sup -/ accelerated to 60 kV. Equilibrium fractions of D/sup -/ in several metal vapors are presented. Mechanisms and measurements of D/sup -/ on surfaces are described, and a scheme is shown for producing high current, high energy beams originating on surfaces.
Date: November 29, 1977
Creator: Hooper, E. B. Jr.; Anderson, O. A.; Orzechowski, T. & Poulsen, P.
Partner: UNT Libraries Government Documents Department
open access

Coil winder for the magnet of the mirror fusion test facility

Description: A coil winder was designed for the purpose of fabricating the superconducting magnets of the Mirror Fusion Test Facility. The superconducting magnets are a displaced ying-yang pair, each having major and minor radii of 2.5 and 0.75 m, respectively, and cross section of 0.42 m by about 1.03 m. The superconductor cross section is a square, 13 mm on a side, and consists of a core of niobium-titanium embedded copper and a solid copper stabilizer. Conceptual studies made at Lawrence Livermore Labora… more
Date: August 29, 1977
Creator: Ling, R.C.
Partner: UNT Libraries Government Documents Department
open access

Samanid ceramics and neutron activation analysis

Description: Glazed pottery known as ''Afrasiyab'' and ''Nishapur'' wares (early Islamic ceramics) are generally attributed to the Samanid dynasty (819-1005). The clay composition of Samanid wares and discarded kiln items found in situ were analyzed by NAA and the elemental composition compared with that of other sherds. 7 figures, 1 table. (DLC)
Date: August 29, 1977
Creator: Azarpay, G.; Frierman, J.D. & Asaro, F.
Partner: UNT Libraries Government Documents Department
open access

Compact 80-keV neutral-beam module

Description: A compact and maintainable source of 80-keV neutral beams that focus to a high power density is required for the Mirror Fusion Test Facility (MFTF). In the new source being designed and built to meet these requirements, the cross-sectional area is reduced in two ways: by immersing the source in a vacuum where high voltage can be held over smaller distances and by redesigning grid supporting structures. Reliability is increased by reducing the electric fields everywhere else below those present … more
Date: September 29, 1977
Creator: Molvik, A. W.; Baird, E. D.; Berkner, K. H.; Cooper, W. S.; Duffy, T. J.; Ehlers, K. W. et al.
Partner: UNT Libraries Government Documents Department
open access

4. pi. interferometric measurements of laser fusion targets

Description: Apparatus is described for rapidly manipulating a hollow glass microsphere laser fusion target and scanning the entire wall with a double pass interference microscope.
Date: September 29, 1977
Creator: Weinstein, B.W.; Willenborg, D.L.; Weir, J.T. & Hendricks, C.D.
Partner: UNT Libraries Government Documents Department
open access

Regulated 15-V, 7500-A, neutral-beam filament supply

Description: Lawrence Livermore Laboratory (LLL) designed a cost-effective, regulated 15-V, 7500-A filament supply for use with the High-Voltage Test Stand , a major ERDA developmental neutral-beam test facility. The filament supply can float to 200 kV and can provide pulse widths up to 30 s. Powered by a 24-V, 0.5-TJ battery bank, it avoids the use of expensive isolation transformers and induction voltage regulators (IVR's). Battery output is regulated by a water-cooled resistor-contactor combination in wh… more
Date: September 29, 1977
Creator: Reass, W.
Partner: UNT Libraries Government Documents Department
open access

Tradeoffs in capacitor bank design

Description: When designing a capacitor bank for energy storage, the engineer should not use more capacitors, voltage, or energy than necessary to supply the load and to overcome losses. Universal curves presented here aid the designer in making intelligent choices. For example, there is a minimum stored energy to be achieved, but no minimum voltage at which to store it. Included in the curves are the effects of series losses such as voltage drops in regulator tubes or in current-limiting resistors. Capacit… more
Date: September 29, 1977
Creator: Leavitt, G.A.
Partner: UNT Libraries Government Documents Department
open access

Negative-ion-based neutral beams and upgraded fusion devices (TFTR, MFTF)

Description: The development of negative-ion-based (H/sup -/, D/sup -/) neutral beams for TFTR and MFTF is discussed. Problems with existing equipment include providing beam current and current density, voltage holding, and gas pumping. The problem of stripping the D/sup -/ is described; it is concluded that photodetachment would be desirable to prevent formation of high-energy D/sup +/. Estimates of the parameters associated with photodetachment show it may be feasible although a detailed study will be req… more
Date: November 29, 1977
Creator: Hooper, E. B. Jr. & Fink, J. H.
Partner: UNT Libraries Government Documents Department
open access

Microradiographic measurement of laser fusion targets

Description: A technique is described for making contact microradiographs of microsphere targets, and for obtaining the target characteristics by fitting the data with a parametric equation.
Date: September 29, 1977
Creator: Singleton, R.M.; Hendricks, C.D. & Weinstein, B.W.
Partner: UNT Libraries Government Documents Department
open access

Fast-scan, beam-profile monitor

Description: A minimodular, data-acquisition system can be used to rapidly interrogate a 45-point matrix of beam-current sampling targets over the 3- x 12-in. rectangular, output beam cross section of a 50-A, neutral-beam ion source. This system, operating at a throughput rate of 12 ..mu..s per channel, can make several complete scans during the 10- to 25-ms-duration beam pulse. Data obtained are available in both analog and digital form. The analog signal is used to create an immediately interpretable CRT … more
Date: September 29, 1977
Creator: Waugh, A. F.
Partner: UNT Libraries Government Documents Department
open access

Sputtering calculations with the discrete ordinated method

Description: The purpose of this work is to investigate the applicability of the discrete ordinates (S/sub N/) method to light ion sputtering problems. In particular, the neutral particle discrete ordinates computer code, ANISN, was used to calculate sputtering yields. No modifications to this code were necessary to treat charged particle transport. However, a cross section processing code was written for the generation of multigroup cross sections; these cross sections include a modification to the total m… more
Date: November 29, 1977
Creator: Hoffman, T. J.; Dodds Jr., H. L.; Robinson, M.T. & Holmes, D.K.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen