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Aerodynamic characteristics of a model of an escape capsule for a supersonic bomber-type airplane at a Mach number of 2.49

Description: Report discussing an investigation of the aerodynamic characteristics of a model of an escape capsule with and without stabilizing fins for a supersonic bomber-type airplane. Lift, drag, longitudinal and lateral stability characteristics, and photographs of the capsule model are presented.
Date: December 3, 1957
Creator: Presnell, John G., Jr.
Partner: UNT Libraries Government Documents Department

Kinetic study of mass transfer by sodium hydroxide in nickel under free-convection conditions

Description: An investigation was conducted using static capsules fabricated from "L" nickel tubing to determine the effect of temperature level, temperature gradient, and test duration on corrosion and mass transfer by molten sodium hydroxide under free-convection conditions. A base temperature range from 1000 degrees to 1600 degrees F with temperature differences to 500 degrees was studied. The rate of mass transfer was found to be strongly dependent on both temperature level and gradient. The rate shows little tendency to decrease for test durations up to 200 hours, although the concentration of nickel in the melt approaches a limited value after 100 hours.
Date: March 10, 1954
Creator: Mosher, Don R. & Lad, Robert A.
Partner: UNT Libraries Government Documents Department

Construction report: GA17-7 (P13N) irradiation capsule

Description: A detailed description of the GA17-7 (P13N) capsule is presented, including fuel sample weights and dimensions, dimensions of capsule components, and piggyback (secondary) experiment locations. The report is intended as a guide for operational thermal analysis, as a reference for post-irradiation examination, and as a reference for future capsule design. (auth)
Date: October 1, 1972
Creator: Steibel, J.S. & Czech, B.A.
Partner: UNT Libraries Government Documents Department

Magnetism in metal-organic capsules

Description: Nickel and cobalt seamed metal-organic capsules have been isolated and studied using structural, magnetic and computational approaches. Antiferromagnetic exchange in the Ni capsule results from coordination environments enforced by the capsule framework.
Date: January 7, 2010
Creator: Atwood, Jerry L.; Brechin, Euan K; Dalgarno, Scott J.; Inglis, Ross; Jones, Leigh F.; Mossine, Andrew et al.
Partner: UNT Libraries Government Documents Department

Decision document for the final disposition of cesium and strontium capsules

Description: This report was prepared to document decisions regarding the disposition of cesium and strontium capsules. A Decision Support Board was established to consider the multiple drivers for decisions regarding disposition of cesium and strontium capsules and make decisions that form the near-term guidance for the project. The decision process included several Decision Board meetings, documented in this report, in which technical and programmatic information was presented by Tank Waste Remediation System (TWRS) technical staff and considered by the Decision Board. The process also included preparation of the decision documentation, which is presented in this report.
Date: March 1, 1997
Creator: Claghorn, R.D., Fluor Daniel Hanford
Partner: UNT Libraries Government Documents Department

Functional design criteria for WESF type-W CsCl capsule overpack

Description: This Functional Design Criteria is designed to summarize and give guidance during the development of design, manufacturing and testing specification documents. As the overview document bounding parameters are specified with detailed acceptance criteria to be developed in the more detailed and separate design, manufacturing and testing specification documents.
Date: February 26, 1997
Creator: Hedquist, K.A., Fluor Daniel Hanford
Partner: UNT Libraries Government Documents Department

Documentation associated with the WESF preparation for receiving 25 cesium capsules from the Applied Radiant Energy Corporation (ARECO)

Description: The purpose of this report is to compile all documentation associated with facility preparation of WESF to receive 25 cesium capsules from ARECO. The WESF validated it`s preparedness by completing a facility preparedness review using a performance indicator checklist.
Date: October 21, 1996
Creator: Pawlak, M.W.
Partner: UNT Libraries Government Documents Department

Capsule design for the National Ignition Facility

Description: Several choices exist in the design and production of capsules intended to ignite and propagate fusion burn of the DT fuel when imploded by indirect drive at the National Ignition Facility. These choices include ablator material, ablator dopant concentration and distribution, capsule dimensions, and x-ray drive profile (shock timings and strengths). The choice of ablator material must also include fabrication and material characteristics, such as attainable surface finishes, permeability, strength, transparency to radio frequency and infrared radiation, thermal conductivity, and material homogeneity. Understanding the advantages and/or limitations of these choices is an ongoing effort for LLNL and LANL designers. At this time, simulations in one- two- and three- dimensions show that capsules with either a copper doped beryllium or a polyimide (C<sup>22</sup>H<sup>10</sup>N<sup>2</sup>O<sup>4</sup>) ablator material have both the least sensitivity to initial surface roughnesses and favorable fabrication qualities. Simulations also indicate the existence of capsule designs based on these ablator materials which ignite and burn when imploded by less than nominal laser performance (900 kJ energy, 250 TW power, producing 250 eV peak radiation temperature). We will describe and compare these reduced scale capsules, in addition to several designs which use the expected 300 eV peak x-ray drive obtained from the nominal NIF laser (1.3 MJ, 500 TW).
Date: August 1, 1998
Creator: Bradley, P. A.; Cook, R. C.; Dittrich, T. R.; Haan, S. W.; Hinkel, D. E.; Marinak, M. M. et al.
Partner: UNT Libraries Government Documents Department

HAPO GRAPHITE IRRADIATION CAPSULES

Description: A summary is presented of the broad field of graphite irradiation capsules. The various capsule designs are considered; they include temperature- controlled and temperature-monitored capsules. The components and materials of the capsules are described. Finally, methods are given for carrying out heat trandsfer calculations in capsule design and neutron spectra calculations for correlation of radiation data from different reactors. (D.L.C.)
Date: September 18, 1963
Creator: Helm, J.W.
Partner: UNT Libraries Government Documents Department

Measurement and simulation of jet mass caused by a high-aspect ratio pertubation

Description: Inertial confinement fusion (ICF) capsule performance can be negatively impacted by the presence of hydrodynamic instabilities. To perform a gas fill on an ICF capsule current plans involve drilling a small hole and inserting a fill tube to inject the gas mixture into the capsule. This introduces a perturbation on the capsule, which can seed hydrodynamic instabilities. The small hole can cause jetting of the shell material into the gas, which might adversely affect the capsule performance. We have performed simulations and experiments to study the hydrodynamic evolution of jets from high-aspect ratio holes, such as the fill tube hole. Although simulations using cold materials over predict the amount of mass in the jet, when a reasonable amount of preheat (&lt; 1 eV) is introduced, the simulations are in better agreement with the experiment.
Date: January 1, 2009
Creator: Keiter, Paul A; Cooley, James; Kyrala, George; Wilson, Doug; Blue, Brent; Elliott, Jim et al.
Partner: UNT Libraries Government Documents Department

Automatic Temperature Control of Irradiation Capsules by a Variable Binary Gas Mixture

Description: Temperature control was achieved by varying the gas mixture, and therefore the thermal conductivity, in a gas annulus surrounding the irradiation capsule. Control systems were used for over one year and maintained capsule temperature to e due to uraniu 10 l F. The system may be used equally satisfactorily with either fueled or nonfueled capsules. The reliability of the system was extremely high, and all maintenance was limited to the readily accessible instrumentation. (auth)
Date: September 12, 1962
Creator: Drescher, R. C. & Johnson, D. E.
Partner: UNT Libraries Government Documents Department

RMF MEASUREMENTS ON MTR-IRRADIATED EUROPIUM OXIDE

Description: Aluminum capsules with Al inserts and He atmospheres and containing 4 strips of Eu/sub 2/O/sub 3/-stainless steel were measured in the Reactivity Measurement Facility at MTR, both before and after irradiation. (T.R.H.)
Date: January 18, 1957
Creator: Henscheid, J.W. & Fast, E.
Partner: UNT Libraries Government Documents Department

High yield inertial fusion design for a z-pinch accelerator

Description: In this paper we discuss design calculations for high yield inertial fusion capsules, indirectly driven by a double-ended z-pinch-driven hohlraum radiation source. The z-pinches are imploded by a high current (- 60 MA) accelerator while enclosed within a hohlraum. Radial spoke arrays and shine shields isolate the capsule from the pinch plasma, magnetic field and direct x-ray shine. Our approach places minimal requirements on z-pinch uniformity and stability, usually problematic due to magneto- Rayleigh Taylor (MRT) instability. The hohlraum smooths the radiation field at the capsule, even in the presence of large millimeter scale inhomogeneities of the pinch and the high-spatial-frequency pertur- bation of the spoke array. The design requires simultaneity and reproducibility of the x-ray output to 5- 10%, however. Reproducibility at this level may be achievable based on experience with the Z and Sat- urn accelerators. Recent Z experiments also suggest a method for generating the required x-ray pulse shape, through implosion of a multi-shell z-pinch. X-ray bursts are calculated and observed to occur at each shell collision. Variation of shell masses and radii allows considerable latitude for creating the desired pulse shape. For the design considered, a capsule absorbing 1 MJ of x-rays at a peak drive tem- perature of 210 eV is found to have adequate stability and produces 400 MJ of yield. A larger capsule with slightly longer drive and similar peak temperature absorbs 2 MJ with a yield of 1200 MJ.
Date: October 1, 1998
Creator: Hammer, J H; Lindl, J; Porter, J L; Rambo, P W; Tabak, M; Toor, A et al.
Partner: UNT Libraries Government Documents Department

[President Hurley's Time Capsule Address]

Description: Video recording of President Hurley's address to the future chancellor of the University of North Texas. This video footage was included in the UNT time capsule buried on campus in 1988 to commemorate the University's final name change from North Texas State University. The time capsule was opened on its scheduled date in 2015.
Date: 1988
Creator: University of North Texas
Partner: UNT Libraries Special Collections

Production of hollow microspheres for inertial confinement fusion experiments

Description: The targets used in inertial confinement fusion (ICF) experiments at the Lawrence Livermore National Laboratory are plastic capsules roughly 0.5 mm in diameter. The capsules, which typically have wall thicknesses from 20 to 60 {mu}m, must possess extraordinary symmetry and concentricity and must have surface finishes of less than 1000 {Angstrom} peak-to-valley variation over surface contours of from 10 to 100`s of {mu}m. This paper reviews the fabrication of these capsules, focusing on the production of the thin-walled polystyrene microshell mandrel around which the capsule is built. The relationship between the capsule characteristics, especially surface finish, and capsule performance is discussed, as are the methods of surface characterization and modification necessary for experiments designed to study the effects of surface roughness on implosion dynamics. Targets for the next generation of ICF facilities using more powerful laser drivers will have to be larger while meeting the same or even more stringent symmetry and surface finish requirements. Some of the technologies for meeting these needs are discussed briefly.
Date: December 1, 1994
Creator: Cook, R.
Partner: UNT Libraries Government Documents Department

AN ANALYSIS OF THE DISTURBANCE OF A URANIUM OXIDE CAPSULE SURFACE TEMPERATURE DISTRIBUTION RESULTING FROM A THERMOCOUPLE ATTACHED TO THE INSIDE SURFACE

Description: A study was initiated to determine the precision with which surface temperature measurements could be made in irradiation capsules containing ceramic fuel. A thermocouple was considered to be positioned in a longitudinal groove prepared in the uranium oxide and metallurgically bonded to the inside surface of the stainless steel clad. A fuel capsule having a 3/4 inch outside diameter, designed as a segment of the EGCR fuel element, and operating with a heat generation rating of 27,500 Btu/hr/lineal foot was assumed. The finite difference approximation was employed to study both the grounded and the ungrounded types of thermocouple junctions. It was found that when a short dummy lead is positioned axially adjacent to the thermocouple junction deviations of about 118 deg F and 101 deg F are obtained for the grounded and ungrounded junction, respectively; in both cases the indicated temperatures are in excess of the undisturbed clad surface temperatures. (auth)
Date: November 1, 1961
Creator: Newell, P.H.
Partner: UNT Libraries Government Documents Department