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Current ramp-up by lower hybrid waves in the PLT tokamak

Description: Recent lower hybrid current drive experiments have clearly demonstrated that the current in a tokamak discharge can be maintained by rf drive alone. We have extended the operating regime of such plasma to include ramping-up of the current. We find that at densities of approx. 2 x 10/sup 12/ cm/sup -3/ approximately 25% of the launched rf power is converted to magnetic field energy.
Date: March 1, 1985
Creator: Jobes, F. C.; Bernabei, S.; Chu, T. K.; Hooke, W. M.; Meservey, E. B.; Motley, R. W. et al.
Item Type: Refine your search to only Report
open access

Current ramp-up with rf waves in a tokamak

Description: The circuit equations for current-drive in a start-up or ramp-up plasma are derived by finding appropriate response functions in the presence of an electric field. The effect of arbitrary wave-induced fluxes on runaway production and current generation can then be determined. An interpretation of the rather remarkable PLT ramp-up efficiencies, difficult to explain using the steady-state efficiency, is now possible. A parameter regime, available also on reactor-grade devices, is identified where… more
Date: August 1, 1984
Creator: Fisch, N. J. & Karney, C. F. F.
Item Type: Refine your search to only Report
open access

Current Reactor Physics Benchmark Activities at the Idaho National Laboratory

Description: The International Reactor Physics Experiment Evaluation Project (IRPhEP) [1] and the International Criticality Safety Benchmark Evaluation Project (ICSBEP) [2] were established to preserve integral reactor physics and criticality experiment data for present and future research. These valuable assets provide the basis for recording, developing, and validating our integral nuclear data, and experimental and computational methods. These projects are managed through the Idaho National Laboratory (I… more
Date: November 1, 2011
Creator: Bess, John D.; Marshall, Margaret A.; Gorham, Mackenzie L.; Christensen, Joseph; Turnbull, James C. & Clark, Kim
Item Type: Refine your search to only Article
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Current redistribution in cables made of insulated, soldered, or oxidized strands

Description: Current redistributions are compared in cables made of insulated strands, soldered, or oxidized strands and insulated strands with periodic joints. After discussing the different current redistributions in the cases of a rapidly changing current and a dc current, several particular situations are investigated: what happens if a strand is broken, or if a local normal zone appears that does not affect all the strands equally, the detection of this normal zone, and the influence of short circuits … more
Date: July 1, 1979
Creator: Turck, B.
Item Type: Refine your search to only Report
open access

Current regulatory and licensing status for byproduct sources, facilities and applications

Description: Public use of nuclear byproducts, especially radioactive isotopes, will require approval by various regulatory agencies. Use of cesium-137 as an irradiation source for sterilizing medical products will require US Nuclear Regulatory Commission (NRC) approval. Two applications have been filed with NRC, and approval is expected soon. Widespread use of irradiation for food products depends on a favorable ruling by the Food and Drug Administration (FDA). A ruling is pending that would permit irradia… more
Date: February 1, 1985
Creator: Tingey, G. L.; Jensen, G. A. & Hazelton, R. F.
Item Type: Refine your search to only Article
open access

Current relaxation time scales in toroidal plasmas

Description: An approximate normal mode analysis of plasma current diffusion in tokamaks is presented. The work is based on numerical solutions of the current diffusion equation in cylindrical geometry. Eigenvalues and eigenfunctions are shown for a broad range of plasma conductivity profile shapes. Three classes of solutions are considered which correspond to three types of tokamak operation. Convenient approximations to the three lowest eigenvalues in each class are presented and simple formulae for the c… more
Date: February 1, 1987
Creator: Mikkelsen, D.R.
Item Type: Refine your search to only Report
open access

Current Renewable Energy Technologies and Future Projections

Description: The generally acknowledged sources of renewable energy are wind, geothermal, biomass, solar, hydropower, and hydrogen. Renewable energy technologies are crucial to the production and utilization of energy from these regenerative and virtually inexhaustible sources. Furthermore, renewable energy technologies provide benefits beyond the establishment of sustainable energy resources. For example, these technologies produce negligible amounts of greenhouse gases and other pollutants in providing en… more
Date: May 1, 2007
Creator: Allison, Stephen W.; Lapsa, Melissa Voss; Ward, Christina D.; Smith, Barton; Grubb, Kimberly R. & Lee, Russell
Item Type: Refine your search to only Report
open access

Current research at NBS using synchrotron radiation at SURF-II

Description: The National Bureau of Standards (NBS) Synchrotron Ultraviolet Radiation Facility (SURF-II) is used in conjunction with a high flux normal incidence monochromator for angle resolved wavelength dependent photoelectron studies. The recent work has concentrated on studies of the effect of shape resonances on molecular vibrational intensity distributions as well as the effects of autoionization upon the vibrational intensity distributions over narrow wavelength regions. Results for CO, N/sub 2/, Ar… more
Date: January 1, 1980
Creator: Parr, A. C.; Rakowsky, G.; Ederer, D. L.; Stockbauer, R. L.; West, J. B. & Dehmer, J. L.
Item Type: Refine your search to only Article
open access

Current research in parallel microprocessing systems at Los Alamos

Description: The Computing and Communications Division at the Los Alamos National Laboratory has designed and is building a parallel microprocessor system (PuPS) to serve as a research tool for evaluating parallel processing of large-scale scientific codes. PuPS is an experimental architecture consisting of an orthogonal array of 20 processing elements by 32 memory elements, establishing a tightly coupled, shared-memory (16-Mbyte) machine. The hardware incorporates VLSI components, such as 16-bit microproce… more
Date: May 2, 1984
Creator: Ethridge, C. D.
Item Type: Refine your search to only Article
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CURRENT RESEARCH TOWARDS IMAGING BIOLOGICAL MOLECULES USING FIELD DESORPTION MICROSCOPY AND FIELD ION MICROSCOPY OF DIAMOND

Description: Work is currently in progress investigating the possibility of imaging large organic and biological molecules in a modification of field desorption microscopy (FDM). A field ion microscope (FIM) is being converted to an FDM by installation of a chevron channel tron electron multiplier array (CEMA), commonly called a chevron channel plate. The chevron CEMA has a gain of over 10{sup 7} and can thus produce enough light from single field desorbed ions to be readily photographed. In field desorptio… more
Date: November 1, 1977
Creator: Hirsch, G. & Washburn, J.
Item Type: Refine your search to only Report
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Current research using the ANL High Voltage Electron Microscope-Tandem Accelerator Facility

Description: Recent work at the Argonne National Laboratory, (ANL), HVEM-Tandem Accelerator user facility is summarized: direct observation of cluster defects formed by in-situ ion irradiation at low temperature using the ion-beam interface has led to important fundamental results on defect production processes. Results on solute segregation at elevated temperatures induced by electron and ion irradiation are reported. Other published work is briefly summarized and/or referenced.
Date: November 1, 1984
Creator: Taylor, A. & Ryan, E.A.
Item Type: Refine your search to only Article
open access

Current results from CDF on W, Z, and top

Description: Results based on data collected by the Collider Detector at Fermilab (CDF) during the Tevatron Collider run now in progress are presented. The results cover analyses of W {yields} e{nu}{sub e} and Z {yields} e{sup +}e{sup {minus}}, {mu}{sup +}{mu}{sup {minus}} event candidates, and discuss the status of the CDF top quark search. Preliminary results from studies of events containing a high E{sub T} electron and muon or a high E{sub T} electron plus {ge} 2 jets indicate that it is unlikely that t… more
Date: January 1, 1989
Creator: Wagner, Robert G.
Item Type: Refine your search to only Article
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Current results from the Los Alamos CTX spheromak

Description: Continued discharge cleaning, improved vacuum practices, and optimized plasma formation operation have resulted in the CTX experiment achieving 1-ms plasma lifetimes with average temperatures of 20 to 40 eV. The major advance in operation has been the use of 5 to 20 mTorr H/sub 2/ gas fill. A multipoint Thomson scattering diagnostic with 12 radial positions yields radial profiles of temperature and densities, an example of which is shown. Local ..beta..'s can be determined from the measured pre… more
Date: January 1, 1982
Creator: Barnes, C. W.; Henins, I.; Hoida, H. W.; Jarboe, T. R.; Knox, S. O.; Linford, R. K. et al.
Item Type: Refine your search to only Article
open access

Current results of the tandem mirror experiment

Description: The basic operating characteristics of the Tandem Mirror Experiment, (TMX) at the Lawrence Livermore Laboratory in the USA have been established. Tandem-mirror plasmas have been produced using neutral-beam-fueled end plugs and a gas-fueled center cell. An axial potential well between the end plugs has been measured. There is direct evidence that this potential well enhances the axial confinement of the center-cell ions. The observed densities and loss currents are consistent with preliminary st… more
Date: April 9, 1980
Creator: Drake, R. P.
Item Type: Refine your search to only Article
open access

A CURRENT REVIEW OF BODY FLUID ANALYSIS, PROCEDURES, AND METHOD OF REPORTING--JANUARY 1957

Description: Direct alpha counting to determine fissile material in dilnte solutions of high total solids content is likely to be inaccurate due to the difficulty of preparing thin sources. This report describes a neutron-activation analysis method which eliminates this risk. Results obtained by the neutronactivation analysis for U/sup 238/ in solution are compared with results obtained from other methods. The standard deviation and sensitivity are shown. (auth)
Date: August 1, 1957
Creator: Brown, P.E.; Davis, D.M. & Henley, L.C.
Item Type: Refine your search to only Report
open access

Current scaling of axially radiated power in dynamic hohlraums and dynamic hohlraum load design for ZR.

Description: We present designs for dynamic hohlraum z-pinch loads on the 28 MA, 140 ns driver ZR. The scaling of axially radiated power with current in dynamic hohlraums is reviewed. With adequate stability on ZR this scaling indicates that 30 TW of axially radiated power should be possible. The performance of the dynamic hohlraum load on the 20 MA, 100 ns driver Z is extensively reviewed. The baseline z-pinch load on Z is a nested tungsten wire array imploding onto on-axis foam. Data from a variety of x-r… more
Date: March 1, 2007
Creator: Mock, Raymond Cecil; Nash, Thomas J. & Sanford, Thomas W. L.
Item Type: Refine your search to only Report
open access

Current schemes for National Synchrotron Light Source UV beamlines

Description: We describe in some detail four beamlines proposed for the National Synchrotron Light Source uv ring at Brookhaven National Laboratory. Three grazing-incidence instruments, one of the plane grating Mijake type and two with toroidal gratings at grazing angles of 2-1/2/sup 0/ and 15/sup 0/ are described. Two normal incidence instruments, one using the source as entrance slit and accepting 75 milliradians horizontally are also discussed. In each case we have estimated the output fluxes expected fr… more
Date: January 1, 1979
Creator: Williams, G. P.; Howells, M. R. & McKinney, W. R.
Item Type: Refine your search to only Article
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Current segmented gamma-ray scanner technology

Description: A new generation of segmented gamma-ray scanners has been developed at Los Alamos for scrap and waste measurements at the Savannah River Plant and the Los Alamos Plutonium Facility. The new designs are highly automated and exhibit special features such as good segmentation and thorough shielding to improve performance.
Date: January 1, 1987
Creator: Bjork, C. W.
Item Type: Refine your search to only Article
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Current sensing in magnetic fusion experiments by Faraday rotation in single-mode optical fibers

Description: We find that sensors exploiting the Faraday effect in single-mode optical fibers are practical means of measuring large currents in the MFE environment. Work still needs to be done to overcome the effects of linear birefringence. We have seen distortion caused by dynamic stress-induced birefringence and shown the importance of physically eliminating it because of the difficulty of treating it analytically.
Date: January 1, 1983
Creator: Chandler, G.I. & Jahoda, F.C.
Item Type: Refine your search to only Article
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Current situation for exoelectron dosimeters of BeO ceramic in neutron dosimetry

Description: Much of the early enthusiasm for using exoelectron dosimeters (ceramic BeO Thermalox 995) in neutron dosimetry was predicted on the belief that the response to fast neutrons, relative to gamma rays, was 0.18 to 0.28 on a R/sub ..gamma../ equiv/tissue rad n/sub f/ basis for neutron energies between 0.1 and 16 MeV. Pairs of BeO disks had to be used, one covered with a polyethylene radiator for producing recoil protons, and the other covered with Teflon. More recent studies indicated a considerabl… more
Date: January 1, 1977
Creator: Gammage, R. B.
Item Type: Refine your search to only Article
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Current Social Security Issues

Description: Social Security is the focus of intense public interest. Projected long-range funding problems, public skepticism about its future, and a growing perception that Social Security will not be as good a value for future retirees as it is today are fueling calls for reform. This report discusses a number of the major Social Security issues currently drawing congressional attention.
Date: May 21, 1998
Creator: Koitz, David & Kollmann, Geoffrey
Item Type: Refine your search to only Report
open access

Current Social Security Issues

Description: Social Security is the focus of intense public interest. Projected long-range funding problems, public skepticism about its future, and a growing perception that Social Security will not be as good a value for future retirees as it is today are fueling calls for reform. This report, updated regularly, discusses a number of the major Social Security issues currently drawing congressional attention.
Date: May 21, 1998
Creator: Koitz, David Stuart & Kollmann, Geoffrey
Item Type: Refine your search to only Report
open access

Current Solutions: Recent Experience in Interconnecting Distributed Energy Resources

Description: This report catalogues selected real-world technical experiences of utilities and customers that have interconnected distributed energy assets with the electric grid. This study was initiated to assess the actual technical practices for interconnecting distributed generation and had a particular focus on the technical issues covered under the Institute of Electrical and Electronics Engineers (IEEE) 1547(TM) Standard for Interconnecting Distributed Resources With Electric Power Systems.
Date: September 1, 2003
Creator: Johnson, M.
Item Type: Refine your search to only Report
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