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Interaction of xenon light with the surface of 304 stainless steel

Description: Laser amplifier frames fabricated from Type 304 stainless steel are known to cause damage to glass lenses by ejecting particles which are deposited on the lenses. High energy pulses of xenon light interact with the steel surface to produce damage sites. Heat treatment and surface cleaning procedures greatly affect the surface stability of the steel and influence contamination generated by the steel. It is believed that inclusions and/or carbides play a role, and the size of damage sites observe… more
Date: February 14, 1978
Creator: Krenzer, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Geothermal aquaculture project: Real Property Systems Inc. , Harney Basin, Oregon

Description: Real Property Systems Inc., (RPS) owns two parcels in the vicinity of Harney Lake, Oregon. One parcel is 120 acres in size, the other is 200 acres. A study concludes that the 200 acre parcel has the greater potential for geothermal development. RPS is interested in an aquaculture operation that produces fresh water prawns, (Macrobrachium rosenbergii) for the market. To supply the heat necessary to maintain the ideal temperature of 82/sup 0/F desired for these prawns, a geothermal resource havin… more
Date: August 14, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Acoustical heat-pumping engine

Description: The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to … more
Date: August 14, 1981
Creator: Wheatley, John C.; Swift, Gregory W. & Migliori, Albert
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Polarizing holographic reflector for electron cyclotron resonant heating (ECRH) on the Tandem Mirror Experiment Upgrade (TMX-U)

Description: A reflector for electron cyclotron resonant heating on the Tandem Mirror Experiment Upgrade has been designed to convert the high-power TE/sub 01/ output of the circular waveguide system into a linearly polarized gaussian intensity pattern in the plasma. The reflector is a computer-generated holographic optical element with a twist polarizer. Its design, fabrication, and performance are discussed. Results of the low- and high-power tests are presented. Low-power tests were used to determine the… more
Date: November 14, 1983
Creator: Coffield, F.E.; Felker, B.; Gallagher, N.C. Jr.; Pedrotti, L.R.; Stallard, B.W.; Sweeney, D.W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Trenton ICES. Volume I. Phase I, final report

Description: Phase I Preliminary Design and Evaluation for a Grid Connected Thermally Controlled Integrated Community Energy System (ICES) for Trenton, New Jersey has been carried out. The findings of the study are that: it is technically feasible, utilizing commercially available hardware; it is economically competitive with conventional alternatives for heating and cooling buildings; it will produce an overall reduction in fuel consumed of 32 to 43% when compared with conventional alternatives for heating… more
Date: July 14, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Onset of Convection in Two Liquid Layers with Phase Change

Description: We perform linear stability calculations for horizontal fluid bilayers that can undergo a phase transformation, taking into account both buoyancy effects and thermocapillary effects in the presence of a vertical temperature gradient. We compare the familiar case of the stability of two immiscible fluids in a bilayer geometry with the less-studied case that the two fluids represent different phases of a single-component material, e.g., the water-steam system. The two cases differ in their interf… more
Date: September 14, 2006
Creator: McFadden, G B; Coriell, S R; Gurski, K F & Cotrell, D L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ion Cyclotron Resonant Heating slot antenna for the Tandem Mirror Experiment-Upgrade

Description: The Ion Cyclotron Resonant Heating (ICRH) slot antenna has been a part of the ion and electron plasma heating system in the central cell region of the Tandem Mirror Experiment-Upgrade (TMX-U). This paper presents the mechanical design and arrangement of the antenna, coax feed lines, feedthroughs, and matching network for the slot antenna.
Date: November 14, 1985
Creator: Brooksby, C. A.; Calderson, M. O.; Cummins, W. F.; Ferguson, S. W. & Williamson, V. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Tandem Mirror Experiment Upgrade (TMX-U) overview-recent events

Description: Since its construction and commissioning was completed in the winter of 1981, the Tandem Mirror Experiment Upgrade (TMX-U) has been conducting tandem mirror thermal barrier experiments. The work, following the fall of 1983 when strong plugging with thermal barriers was achieved, has been directed toward controlling radial transport and forming thermal barriers with high density and Beta. This paper describes the overall engineering component of these efforts. Major changes to the machine have i… more
Date: November 14, 1985
Creator: Calderon, M.O. & Bell, H.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Use of polarimetry to measure the current profile in MTX

Description: It is possible in principle to measure the poloidal magnetic field profile, and hence, the profile of the plasma current measuring the change in the polarization of a sequence of microwave beams that pass through the plasma. Actual measurements of the plasma current profile would be very interesting in connection with Lower-Hybrid (or EC) current drive experiments since this would provide direct information on modification of the current profile by the application of rf power. A microwave polar… more
Date: July 14, 1987
Creator: Nevins, W. M.; Hooper, E. B. & Bernstein, I. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Plasma confinement calculations for TIBER-II: Final report

Description: This paper compares the empirically based TIBER II design parameters against the reactor parameters of a tokamak based on a theoretical model of heat transport. The motivation behind this project is the following. The present TIBER-II design is based on an empirical scaling of confinement time tau/sub E/ known as Kaye-Goldston scaling. This empirical scaling is based on data from tokamak plasmas whose temperatures did not exceed a few keV, while the TIBER-II requires electron temperatures of 25… more
Date: October 14, 1987
Creator: Ibrahim, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Changes and Developments in Electron Cyclotron Resonant Heating (ECRH) on the Tandem Mirror Experiment Upgrade (TMX-U)

Description: This paper will describe changes to the previously reported Electron Cyclotron Resonant Heating (ECRH) circular waveguide systems that deliver power to the Tandem Mirror Experiment Upgrade (TMX-U) machine. Four gyrotrons and associated waveguide systems, operating at 28-GHz and 200 kW each, helped establish electrostatic plugging in the end cells of TMX-U. A fifth gyrotron has been installed to power two resonant locations in the end plugs. This system and the pair of 10 kG heaters now use a sl… more
Date: November 14, 1985
Creator: Anderson, A. T.; Brooksby, C. A.; Calderon, M. O.; Ellis, R.; Felker, B.; Horton, R. D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hot electrons in the anchor region of the axicell design of the Mirror Fusion Test Facility (MFTF)

Description: The axicell design of the Mirror Fusion Test Facility (MFTF) requires electron cyclotron resonance heating (ECRH) up to average electron energies of as high as 450 keV. These temperatures, plus the magnetic field and plasma beta profiles, lead to the requirement for three frequencies-28, 35, and 56 (or 60) GHz. Power balance studies include the effects of scattering, drag, synchrotron radiation, and cold electron production, and they predict that about 600 kW of ECRH power is needed at each end… more
Date: September 14, 1982
Creator: Shearer, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Time integrated x-ray measurments of the very energetic electron end loss profile in TMX-U

Description: The time-integrated 2-D profile of the thick-target bremsstrahlung produced by energetic end loss electrons has been measured during ECRH operation of TMX-U. Sheets of x-ray film and/or arrays of thermoluminescent dosimeters were placed on the outside of the end tank end wall to measure the relative spatial x-ray profile, with locally added filters of Pb to determine the effective mean x-ray energy. The purpose of this simple survey diagnostic was to allow deduction of the gross features of the… more
Date: September 14, 1984
Creator: Osher, J.E. & Fabyan, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Auxiliary plasma heating and fueling models for use in particle simulation codes

Description: Computational models of a radiofrequency (RF) heating system and neutral-beam injector are presented. These physics packages, when incorporated into a particle simulation code allow one to simulate the auxiliary heating and fueling of fusion plasmas. The RF-heating package is based upon a quasilinear diffusion equation which describes the slow evolution of the heated particle distribution. The neutral-beam injector package models the charge exchange and impact ionization processes which transfe… more
Date: March 14, 1989
Creator: Procassini, Richard J. & Cohen, Bbruce I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigating the Heating of a Potassium-Doped Aluminosilicate Ion Source Using a 1 Micron Laser

Description: The heavy ion fusion (HIF) program is interested in developing a high brightness ion source for high energy density physics (HEDP) experiments. One possible approach to obtaining higher brightness may be to raise the surface temperature of the ion source just prior to extraction. The current ion source material being studied is a layer of potassium-doped aluminosilicate bonded to a tungsten substrate. It is speculated that if the surface temperature of the source is raised above 1200 C (from a … more
Date: December 14, 2004
Creator: Schmitt, R. C.; Meier, W. R.; Kwan, J. W.; Abbott, R. P. & Latkowski, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical Design of the HER Synchrotron Light Monitor Primary Mirror

Description: This paper describes the mechanical design of the primary mirror that images the visible portion of the synchrotron radiation (SR) extracted from the High Energy Ring (HER) of the PEP-II B-Factory. During off-axis operation, the water-cooled GlidCop mirror is subjected to a heat flux in excess of 2000 W/cm2. When on-axis imaging occurs, the heat flux due to scattered SR, resistive wall losses and Higher-Order-Mode (HOM) heating is estimated at 1 W/cm2. The imaging surface is plated with Electro… more
Date: September 14, 2011
Creator: Daly, Edward F.; Fisher, Alan S.; Kurita, Nadine R. & Langton, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Essay: Robert H. Siemann As Leader of the Advanced Accelerator Research Department

Description: Robert H. Siemann originally conceived of the Advanced Accelerator Research Department (AARD) as an academic, experimental group dedicated to probing the technical limitations of accelerators while providing excellent educational opportunities for young scientists. The early years of the Accelerator Research Department B, as it was then known, were dedicated to a wealth of mostly student-led experiments to examine the promise of advanced accelerator techniques. High-gradient techniques includin… more
Date: November 14, 2011
Creator: Colby, Eric R. & Hogan, Mark J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cloud Occurrence Frequency at the Barrow, Alaska, ARM Climate Research Facility for 2008 Third Quarter 2009 ARM and Climate Change Prediction Program Metric Report

Description: Clouds represent a critical component of the Earth’s atmospheric energy balance as a result of their interactions with solar and terrestrial radiation and a redistribution of heat through convective processes and latent heating. Despite their importance, clouds and the processes that control their development, evolution and lifecycle remain poorly understood. Consequently, the simulation of clouds and their associated feedbacks is a primary source of inter-model differences in equilibrium clima… more
Date: July 14, 2009
Creator: Jensen, M; Johnson, K & Mather, JH
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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EFRT M12 Issue Resolution: Comparison of PEP and Bench-Scale Oxidative Leaching Results

Description: Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed and constructed and is to be operated as part of a plan to respond to issue M12, “Undemonstrated Leaching Processes.” The P… more
Date: August 14, 2009
Creator: Rapko, Brian M.; Brown, Christopher F.; Eslinger, Paul W.; Fountain, Matthew S.; Hausmann, Tom S.; Huckaby, James L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pulling of 3 mm diameter AlSb rods by micro-pulling down method

Description: We designed and supplied special crucibles for AlSb material. Thermal insulation and limitation of Sb losses were our first work. The protection of the growth environment was also one of our priority to avoid any pollution of the Fibercryst {mu}PD facility. When this work was achieved, the next step was the calibration of the heating power for these new crucibles. Then, it was the definition of single crystal growth conditions that oriented our research. Following our proposal, many growths att… more
Date: May 14, 2009
Creator: Bourret-Courchesne, Edith & Perrodin, Didier
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Implications of NSTX Lithium Results for Magnetic Fusion Research

Description: Lithium wall coating techniques have been experimentally explored on NSTX for the last five years. The lithium experimentation on NSTX started with a few milligrams of lithium injected into the plasma as pellets and it has evolved to a lithium evaporation system which can evaporate up to ~ 100 g of lithium onto the lower divertor plates between lithium reloadings. The unique feature of the lithium research program on NSTX is that it can investigate the effects of lithium in H-mode divertor plas… more
Date: January 14, 2010
Creator: M. Ono, M.G. Bell, R.E. Bell, R. Kaita, H.W. Kugel, B.P. LeBlanc, J.M. Canik, S. Diem, S.P.. Gerhardt, J. Hosea, S. Kaye, D. Mansfield, R. Maingi, J. Menard, S. F. Paul, R. Raman, S.A. Sabbagh, C.H. Skinner, V. Soukhanovskii, G. Taylor, and the NSTX Research Team
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Harmonic Fast Wave Heating Efficiency Enhancemen and Current Drive at Longer Wavelength on the National Spherical Torus Experiment

Description: High harmonic fast wave heating and current drive (CD) are being developed on the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 41, 1435 (2001)] for supporting startup and sustainment of the ST plasma. Considerable enhancement of the core heating efficiency (η) from 44% to 65% has been obtained for CD phasing of the antenna (strap-to-strap φ = -90o, kφ = -8 m-1) by increasing the magnetic field from 4.5 kG to 5.5 kG. This increase in efficiency is strongly correlated t… more
Date: January 14, 2008
Creator: J. Hosea, R. E. Bell, B.P. LeBlanc, C.K. Phillips, G. Taylor, E. Valeo, J.R. Wilson, E.F. Jaeger, P.M. Ryan, J. Wilgen, H. Yuh, F. Levinton, S. Sabbagh, K. Tritz, J. Parker, P.T. Bonoli, R. Harvey, and the NSTX Team
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-Physics Analysis of the Fermilab Booster RF Cavity

Description: After about 40 years of operation the RF accelerating cavities in Fermilab Booster need an upgrade to improve their reliability and to increase the repetition rate in order to support a future experimental program. An increase in the repetition rate from 7 to 15 Hz entails increasing the power dissipation in the RF cavities, their ferrite loaded tuners, and HOM dampers. The increased duty factor requires careful modelling for the RF heating effects in the cavity. A multi-physic analysis investi… more
Date: May 14, 2012
Creator: Awida, M.; Reid, J.; Yakovlev, V.; Lebedev, V.; Khabiboulline, T. & Champion, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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