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in subjects: "Pumping"

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Sources of polarized ions and atoms

In this presentation we discuss methods of producing large quantities of polarized atoms and ions (Stern-Gerlach separation, optical pumping, and spin-exchange) as well as experimental methods of measuring the degree of polarization of atomic systems. The usefulness of polarized atoms in probing the microscopic magnetic surface properties of materials will also be discussed. 39 refs., 5 figs., 2 tabs.

Date: January 1, 1988

Creator: Cornelius, W.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Feasibility of laser pumping with neutron fluxes from present-day large tokamaks

The minimum fusion-neutron flux needed to observe nuclear-pumped lasing with tokamaks can be reduced substantially by optimizing neutron scattering into the laser cell, located between adjacent toroidal-field coils. The laser lines most readily pumped are probably the /sup 3/He-Ne lines at 0.633 ..mu.. and in the infrared, where the /sup 3/He-Ne gas is excited by energetic ions produced in the /sup 3/He(n,p)T reaction. These lines are expected to lase at the levels of D-T neutron flux foreseen … more

Date: August 1, 1986

Creator: Jassby, D. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Economic impact of using nonmetallic materials in low to intermediate temperature geothermal well construction. Volume 1

The results are presented of an exhaustive literature search and evaluation concerning the properties and economics of commercially available nonmetallic well casing and screens. These materials were studied in terms of their use in low to intermediate temperature geothermal well construction.

Date: December 1, 1979

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Feasibility demonstration of the Sperry down-well pumping system. Final report

Advantages of down-well pumping (vs. free-flowing) of geothermal hot-water wells are presented, and criteria for such a system are discussed. The main body of the report is presented under the following section headings: the Sperry down-well pumping system; field test program; field operations; test results; and, conclusions and recommendations. The appendix includes a summary of boiler heat transfer and pressure drop calculations. (JGB)

Date: May 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Experimental development of nuclear pumped laser candidate inertial confinement fusion driver

This progress report is submitted at the end of the first year of a 3-year project grant studying development of a nuclear pumped atomic iodine laser. The first section of the report will provide background on the study and briefly describe the original plans for the 3-year project. The second section will detail the work done to date. Included will be a description of the preparations made for experimentation, as well as some preliminary results recently obtained. Plans for the upcoming budget… more

Date: May 31, 1989

Creator: Miley, George H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Shale fracturing injections at Oak Ridge National Laboratory: 1977-1979 series

Intermediate-level waste solution generated at ORNL is periodically mixed with a cement-base blend of dry solids and injected into an impermeable shale formation at an approximate depth of 240 m (800 ft). The grout mix sets shortly after the injection, permanently fixing the radionuclides in the shale formation. A series of four injections of intermediate-level waste solution was made between 1977 and 1979. A total of 1.2 million l (314,000 gal) of waste solution containing 81,780 Ci of radionu… more

Date: September 1, 1980

Creator: Weeren, H.O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Experimental development of nuclear pumped laser candidate for inertial confinement fusion driver

A report is given on progress made during the second year of a three year contract studying the feasibility of nuclear pumping the atomic iodine laser. Experimental results are presented showing efficiencies of 25--38% at converting neutron-induced nuclear reaction energy in the excimer XeBr into UV photons which can be used to pump the laser. Parametric studies were done utilizing the {sup 10}B(n,{alpha}){sup 7}Li reaction, with three bromine donor chemicals, over a range of pressures and mix … more

Date: June 6, 1990

Creator: Miley, George H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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/sup 3/He functions in tokamak-pumped laser systems

/sup 3/He placed in an annular cell around a tokamak fusion generator can convert moderated fusion neutrons to energetic ions by the /sup 3/He(n,p)T reaction, and thereby excite gaseous lasants mixed with the /sup 3/He while simultaneously breeding tritium. The total /sup 3/He inventory is about 4 kg for large tokamak devices. Special configurations of toroidal-field magnets, neutron moderators and beryllium reflectors are required to permit nearly uniform neutron current into the laser cell wi… more

Date: October 1, 1986

Creator: Jassby, D. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Interpretation of interference data from the Klamath Falls, Oregon geothermal resource

Data from a seven week pressure interference test in the Klamath Falls, Oregon geothermal resource have been analyzed. The data indicate that productive wells are fed by a highly permeable fracture network and that the less permeable matrix blocks contribute significantly to the reservoir storage capacity. Detailed analysis of data from two wells is presented. Data from both of the wells yield a reservoir permeability-thickness (kh) of approximately 1.3x10/sup 6/ md-ft and a storativity (phi c/… more

Date: November 1, 1983

Creator: Benson, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress report, April 1, 1981 to March 31, 1982

Our experiments on chemical reactions might be described by a laser specialist as pump and probe experiments. The pump process is a photodissociation and the probe process is a laser induced fluorescence (LIF). Both these processes would be somewhat limited if they were confined to one photon excitations. For example, to probe vibrationally and rotationally excited CO molecules one can conveniently use Bernheim's technique of exciting the A'..pi.. reverse arrow X'..sigma.. transition in CO by a… more

Date: January 1, 1982

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Behavior of temperature and concentration of shallow groundwater in the Raft River Geothermal Area

A moderate-temperature (140/sup 0/C) geothermal power plant demonstration, sponsored by the Department of Energy, is currently under development in South Central Idaho. Environmental concerns about the quality of the local shallow groundwater prompted a modeling study. Simulation results (1) suggest significant thermal and quality levels within the 30-year projected plant operation and (2) makes obvious the importance of understanding the interconnected hydraulic systems.

Date: May 1, 1980

Creator: Tang, D.H.; Goldman, D.; Martinez, J.A. & Lantz, R.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Impact of advanced fluids on costs of district cooling systems

Three alternate fluids, ice-water slurry, friction reduction additive and the combination of them, have been compared for use in District Cooling Systems (DCS). The effect of the fluids on cost and cooling capacities were considered for the two cases of new and existing DCS separately. Two criteria were used in comparisons among fluids in each case: constant pumping power which allows for the most benefit, and constant velocity which is more practical consideration. An economic assessment for a… more

Date: January 1, 1992

Creator: Choi, U.S. (Argonne National Lab., IL (United States)); France, D.M. & Knodel, B.D. (Argonne National Lab., IL (United States) Illinois Univ., Chicago, IL (United States). Dept. of Mechanical Engineering)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Plasma channel optical-pumping device and method

A device and method are described for optically pumping a gaseous laser using blackbody radiation produced by a plasma channel which is formed from an electrical discharge between two electrodes spaced at opposite longitudinal ends of the laser. A preionization device which can comprise a laser or electron beam accelerator produces a preionization beam which is sufficient to cause an elctrical discharge between the electrodes to initiate the plasma channel along the preionization path. The opti… more

Date: July 17, 1981

Creator: Judd, O.P.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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Optical Pumping for Intense Polarized Ion Sources

Laser optical pumping without buffer gas in dense (NL>10/sup 12/ atoms/cm/sup 2/) sodium vapor targets was investigated. The atomic polarization of the target was determined from the Faraday rotation angle of a second dye laser tuned midway between the sodium D-lines. Substantial polarizations were measured even though the pump laser bandwidth (approx. 1 MHz) was much smaller than the Doppler and hyperfine broadened sodium absorption line (approx. 3 GHz). Theoretical calculations based on rate … more

Date: January 1, 1982

Creator: Cornelius, W. D.; Taylor, D. J.; York, R. L. & Hinds, E. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Aquifer tests near the Idaho Falls Foothills, Idaho

Ground water pumping tests were performed in two wells located in the foothills east of Idaho Falls to determine the aquifer characteristics at these locations. These data were used to differentiate this aquifer from the Snake River Plain aquifer. The wells were pumped at rates of 11 and 14 gallons per minute with 0.03 and 0.04 ft of drawdown measured in the pumping wells. The transmissivity is estimated to be 525,000 gpd/ft and 450,000 gpd/ft, respectively. The hydraulic conductivity is 925 ft… more

Date: October 3, 1991

Creator: Hubbell, J.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Discharge excitation of the XeF C to A transition

Recent success in high efficiency and high energy laser extraction of tunable radiation in the blue-green C-A transition of XeF under intense, short-pulse electron beam excitation has renewed interest in the possibility of similar performance in avalanche discharges. We present preliminary results of discharge excited fluorescence studies in a variety of devices having different degrees of energy loading.

Date: January 1, 1987

Creator: Sze, R. C.; Greene, D. P.; Bigio, I. J.; Shay, T. M.; McCown, A. W.; Figueira, J. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High field optical-pumping spin-exchange polarized deuterium source

Recent progress in the performance of laser-driven source of polarized deuterium is described. Optical pumping of potassium atoms followed by spin exchange scattering with deuterium atoms in a high magnetic field and RF transitions in a medium field was found to produce an intense, highly spin-polarized beam of deuterium atoms. In particular, the atomic polarization of deuterium was determined to be 73{plus minus}3% at an intensity of 2.1 {times} 10{sup 17} Atomsis. The RF transition efficiency… more

Date: January 1, 1991

Creator: Zghiche, A.; Coulter, K. P.; Holt, R. J.; Kinney, E. R.; Kowalczyk, R. S.; Potterveld, D. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of a Laser Optically Pumped Polarized Target for Use in Heavy-Ion Physics

Important micro- and macroscopic details of heavy-ion reactions may be explicitly determined when nuclear spin aligned (polarized) targets are used. For deformed nuclei, the orientation of the symmetry axis of the nuclear density distribution is determined by the nuclear spin orientation. Polarized targets would thus allow experiments to be performed as a function of the orientation of the symmetry axis of the nuclear density distribution. A polarized target of /sup 151/ /sup 153/Eu is being de… more

Date: January 1, 1982

Creator: Shivakumar, B.; Beene, J.R.; Bemis, C.E. Jr.; Erb, K.A.; Ford, J.L.C. Jr. & Shapira, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Models for geothermal wells

The problem of two-phase flow pressure loss is examined in order to give an answer to the problem of determination of the wellhead conditions. For this purpose two models have been developed, the first based on the pattern structure of the flow and the second on the mixing length theory. The void fraction correlations and the transition conditions are presented in the first model as a means of estimating the pressure loss. Heat losses, and the effect of impurities are examined in detail. An exp… more

Date: June 1, 1980

Creator: Michaelides, E.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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VUV production from a ferrite-driven flash-pumped system

The relative spectral emission as a function of wavelength in the 1200--2900 {Angstrom} region is measured for a vacuum UV flash device whose discharge is initiated by a high resistance formed-ferrite rod. The device is studied because of its usefulness in the optical pumping of large volume laser systems.

Date: January 1, 1991

Creator: Sze, R.C. (Los Alamos National Lab., NM (United States)) & Sentis, M. (Institut de Mecanique des Fluides, 13 - Marseille (France))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Pump down rate for SRF cavities

This note is about calculations aimed at quantifying adequate pumping speeds of evacuation of normally humid clean-room air from typical Superconducting Radiofrequency (SRF) cavities. The subject is of high relevance to the semiconductor industry, where the yield of VLSI (Very Large Scale Integration) chip production is affected by micron size particles which may cause fatal defects to their micron and sub-micron features. The recent availability of particle counters capable of operating in vac… more

Date: February 1, 1992

Creator: Kuchnir, M. (Fermi National Accelerator Lab., Batavia, IL (United States)) & Knobloch, J. (Cornell Univ., Ithaca, NY (United States). Lab. of Nuclear Studies)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Relief valve sizing for the sup 3 He recirculation system of the MP-9 polarized target

This report contains pressure safety analyses for the relief valving of the {sup 3}He pump system, as distinct from the dilution refrigerator (DR). However, in a few instances it has been convenient to include here some aspects of the interaction between the DR and the gas loop proper. The more localized safety aspects of certain elements of the DR, such as the vacuum jacket and window, the Still, and the Phase Separator, will be addressed in a separate analysis.

Date: August 21, 1989

Creator: Hill, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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X rays generated in the interaction of subpicosecond laser pulses with solid targets

We are investigating the generation of short pulse short wavelength x-rays for pumping inner-shell x-ray lasers by photo-ionization. In contrast with previous proposals, we are looking at the use of a single line as an efficient means of pumping these lasers. As a first step we are optimizing the flashlamp x-ray conversion efficiency and characterizing the x-ray pulse length. 18 refs., 5 figs., 2 tabs.

Date: January 1, 1991

Creator: Kyrala, G. A.; Wahlin, E. K.; Fulton, R. D.; Schappert, G. T.; Jones, L. A.; Taylor, A. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Defining an optimum pumping time requirement for sampling ground-water wells on the Hanford site

The objective was to determine the optimum time period necessary to pump water from a well before a representative sample of the ground water can be obtained. It was assumed that a representative sample has been collected if the concentration of chemical parameters is the same in a number of samples taken consecutively, so that the concentration of parameters does not vary with time of collection. Ground-water samples used in this project were obtained by pumping selected wells on the Hanford S… more

Date: April 1, 1982

Creator: Scharnhorst, N.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department