101 Matching Results

Search Results

Results: 1 - 24 next
open access

Selective Filtration of Gadolinium Trichloride for Use in Neutron Detection in Large Water Cherenkov Detectors

Description: Water Cherenkov detectors have been used for many years as inexpensive, effective detectors for neutrino interactions and nucleon decay searches. While many important measurements have been made with these detectors a major drawback has been their inability to detect the absorption of thermal neutrons. We believe an inexpensive, effective technique could be developed to overcome this situation via the addition to water of a solute with a large neutron cross section and energetic gamma daughters… more
Date: April 10, 2013
Creator: Vagins, Mark R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Efficient Inversion of Multi-frequency and Multi-source Electromagnetic Data: Final report

Description: BES grant DE-FG02-06ER15819 supported efforts at Oregon State University (OSU) to develop improved inversion methods for 3D subsurface electromagnetic (EM) imaging. Three interrelated activities have been supported by this grant, and its predecessor (DE-FG02-06ER15818): (1) collaboration with a former student of the PI, Dr. Weerachai Siripunvaraporn (now Professor at Mahidol University in Bangkok, Thailand) on developing and refining inversion methods for 3D Magnetotelluric (MT) data . (2) Deve… more
Date: April 10, 2013
Creator: Egbert, Gary D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Physics of Radiation-driven Islands Near the Tokamak Density Limit

Description: In previous work [1], the onset criterion for radiation driven islands [2] in combination with a simple cylindrical model of tokamak current channel behavior was shown to be consistent with the empirical scaling of the tokamak density limit [3]. A number of the unexplained phenomena at the density limit are consistent with this novel physics mechanism. In this work, a more formal theoretical underpinning, consistent with cylindrical tearing mode theory, is developed for the onset criteria of th… more
Date: January 10, 2013
Creator: D.A. Gates, L. Delgado-Apricio and R.B. White
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Collisionality Scaling of Main-ion Toroidal and Poloidal Rotation in Low Torque DIII-D Plasmas

Description: In tokamak plasmas with low levels of toroidal rotation, the radial electric fi eld Er is a combination of pressure gradient and toroidal and poloidal rotation components, all having similar magnitudes. In order to assess the validity of neoclassical poloidal rotation theory for determining the poloidal rotation contribution to Er , Dα emission from neutral beam heated tokamak discharges in DIII-D [J.L. Luxon, Nucl. Fusion 42 , 614 (2002)] has been evaluated in a sequence of low torque (electro… more
Date: May 10, 2013
Creator: Grierson, B. A.; Burrell, K. H.; Solomon, W. M.; Budny, R. V. & Candy, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FABRICATION AND DEPLOYMENT OF THE 9979 TYPE AF RADIOACTIVE WASTE PACKAGING FOR THE DEPARTMENT OF ENERGY

Description: This paper summarizes the development, testing, and certification of the 9979 Type A Fissile Packaging that replaces the UN1A2 Specification Shipping Package eliminated from Department of Transportation (DOT) 49 CFR 173. The DOT Specification Package was used for many decades by the U.S. nuclear industry as a fissile waste container until its removal as an authorized container by DOT. This paper will discuss stream lining procurement of high volume radioactive material packaging manufacturing, … more
Date: October 10, 2013
Creator: Blanton, P. & Eberl, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An Initial Evaluation Of Characterization And Closure Options For Underground Pipelines Within A Hanford Site Single-Shell Tank Farm

Description: The Hanford Site includes 149 single-shell tanks, organized in 12 'tank farms,' with contents managed as high-level mixed waste. The Hanford Federal Facility Agreement and Consent Order requires that one tank farm, the Waste Management Area C, be closed by June 30, 2019. A challenge to this project is the disposition and closure of Waste Management Area C underground pipelines. Waste Management Area C contains nearly seven miles of pipelines and 200 separate pipe segments. The pipelin… more
Date: January 10, 2013
Creator: Badden, Janet W.; Connelly, Michael P.; Seeley, Paul N. & Hendrickson, Michelle L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

National Emission Standards for Hazardous Air Pollutants - Radionuclide Emissions Calendar Year 2012

Description: The U.S. Department of Energy, National Nuclear Security Administration Nevada Field Office (NNSA/NFO) operates the Nevada National Security Site (NNSS) and North Las Vegas Facility (NLVF). From 1951 through 1992, the NNSS was the continental testing location for U.S. nuclear weapons. The release of radionuclides from NNSS activities has been monitored since the initiation of atmospheric testing. Limitation to underground detonations after 1962 greatly reduced radiation exposure to the public s… more
Date: June 10, 2013
Creator: Warren, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A New Electrostatically-focused UV HPD for Liquid Xenon

Description: Appropriate photodetectors are a major challenge for liquid xenon technology as proposed by the next generation of double beta decay, solar neutrino, and dark matter searches. The primary photon signal is tiny and in the hard ultraviolet, the installation is cryogenic, and the sensors themselves must not introduce background. Hybrid photodiodes (HPDs) provide an easy substitute for a conventional PMT with the added advantages of low radioactivity, better area coverage, and single photoelectron … more
Date: July 10, 2013
Creator: Cushman, Priscilla Brooks
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Conceptual Design of the CLIC Damping Rings

Description: In order to achieve high luminosity in CLIC, ultra-low emittance bunches have to be generated in both electron and positron damping rings. To achieve this goal, big energy loss per turn in the wigglers has to be compensated by the RF system. This results in very strong beam loading transients affecting the longtudinal bunch position and bunch length. In this paper, the conceptual design of the RF system for the CLIC damping ring (DR) is presented. Baseline for the CLIC conceptual design report … more
Date: October 10, 2013
Creator: Boland, M. J.; Korostelev, M.; Palmer, M. A.; Koukovini, E.; Antoniou, F.; Chiggiato, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

REDUCTIONS WITHOUT REGRET: DEFINING THE NEEDED CAPABILITIES

Description: This is the second of three papers (in addition to an introductory summary) aimed at providing a framework for evaluating future reductions or modifications of the U.S. nuclear force, first by considering previous instances in which nuclear-force capabilities were eliminated; second by looking forward into at least the foreseeable future at the features of global and regional deterrence (recognizing that new weapon systems currently projected will have expected lifetimes stretching beyond our a… more
Date: September 10, 2013
Creator: Swegle, J. & Tincher, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DEPLOYMENT OF THE BULK TRITIUM SHIPPING PACKAGE

Description: A new Bulk Tritium Shipping Package (BTSP) was designed by the Savannah River National Laboratory to be a replacement for a package that has been used to ship tritium in a variety of content configurations and forms since the early 1970s. The BTSP was certified by the National Nuclear Safety Administration in 2011 for shipments of up to 150 grams of Tritium. Thirty packages were procured and are being delivered to various DOE sites for operational use. This paper summarizes the design features … more
Date: October 10, 2013
Creator: Blanton, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report

Description: The biochemistry of bacterial proteins involved in redox transformations of metals and minerals is, without dispute, an important area of research. Nevertheless, most studies on bacterial metal transformation have focused not on biochemistry but on genetics and genomics. The objective of this research is to better understand the role of conformation change in electron transfer from cytochromes to minerals, a process that underpins respiratory metal reduction by bacteria in nature and in bioreme… more
Date: September 10, 2013
Creator: Magnuson, Timothy S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen