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[Byrd Photo Service pens]

Description: Photograph of a selection of pens advertising the Byrd Photo Service, Inc. from the Byrd Williams Family Photography Collection, held by UNT Special Collections. They are silver pens with the name and address of the old Byrd Photo Service storefront listed on the side. There is a diamond detail under the clip in red and blue.
Date: July 20, 2016
Creator: Sylve, Joshua
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections

[Closed puzzle box]

Description: Photograph of a secret puzzle box from the Byrd Williams Family Photography Collection, held by UNT Special Collections. There are geometric patterns laid out on the side and a scene of a boat on a lake and a building on the shoreline with mountains and a large tree in an Asian style. The image is surrounded by square and triangle geometric shapes.
Date: July 20, 2016
Creator: Sylve, Joshua
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections

[Open compartments in puzzle box]

Description: Photograph of a secret puzzle box from the Byrd Williams Family Photography Collection, held by UNT Special Collections. There are geometric patterns laid out on the side and on the top is a scene of a boat on a lake and a building on the shoreline with mountains and a large tree in an Asian style. The image is surrounded by square and triangle geometric shapes. The pieces are all pulled apart to open the secret compartment with papers inside of it. There is also a flower painted onto the top o… more
Date: July 20, 2016
Creator: Sylve, Joshua
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections

[Open puzzle box]

Description: Photograph of a secret puzzle box from the Byrd Williams Family Photography Collection, held by UNT Special Collections. There are geometric patterns laid out on the side and on the top is a scene of a boat on a lake and a building on the shoreline with mountains and a large tree in an Asian style. The image is surrounded by square and triangle geometric shapes. The pieces are all pulled apart to open the secret compartment with papers inside of it. There is also a flower painted onto the top o… more
Date: July 20, 2016
Creator: Sylve, Joshua
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
open access

Secondary-electron emission from hydrogen-terminated diamond

Description: Diamond amplifiers demonstrably are an electron source with the potential to support high-brightness, high-average-current emission into a vacuum. We recently developed a reliable hydrogenation procedure for the diamond amplifier. The systematic study of hydrogenation resulted in the reproducible fabrication of high gain diamond amplifier. Furthermore, we measured the emission probability of diamond amplifier as a function of the external field and modelled the process with resulting changes in… more
Date: May 20, 2012
Creator: Wang, E.; Ben-Zvi, Ilan; Rao, T.; Wu, Q.; Dimitrov, D. A. & Xin, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

South pole bang-time diagnostic on the National Ignition Facility

Description: The south pole bang-time (SPBT) diagnostic views National Ignition Facility (NIF) implosions through the lower hohlraum laser entrance hole to measure the time of peak x-ray emission (peak compression) in indirect drive implosions. Five chemical-vapor-deposition (CVD) diamond photoconductive detectors (PCD's) with different filtrations and sensitivities record the time-varying x rays emitted by the target. Wavelength-selecting highly oriented pyrolytic graphite (HOPG) crystal mirror monochromat… more
Date: May 1, 2012
Creator: MacPhee, A.; Edgell, D.; Bradley, D. K.; Bond, E. J.; Burns, S.; Callahan, D. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dielectric-Lined High-Gradient Accelerator Structure

Description: Rectangular particle accelerator structures with internal planar dielectric elements have been studied, with a view towards devising structures with lower surface fields for a given accelerating field, as compared with structures without dielectrics. Success with this concept is expected to allow operation at higher accelerating gradients than otherwise on account of reduced breakdown probabilities. The project involves studies of RF breakdown on amorphous dielectrics in test cavities that coul… more
Date: April 24, 2012
Creator: Hirshfield, Jay L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Raman Investigation of The Uranium Compounds U3O8, UF4, UH3 and UO3 under Pressure at Room Temperature

Description: Our current state-of-the-art X-ray diffraction experiments are primarily sensitive to the position of the uranium atom. While the uranium - low-Z element bond (such as U-H or U-F) changes under pressure and temperature the X-ray diffraction investigations do not reveal information about the bonding or the stoichiometry. Questions that can be answered by Raman spectroscopy are (i) whether the bonding strength changes under pressure, as observed by either blue- or red-shifted peaks of the Raman a… more
Date: December 15, 2011
Creator: Lipp, M. J.; Jenei, Z.; Park-Klepeis, J. & Evans, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THz Pump and X-Ray Probe Development at LCLS

Description: We report on measurements of broadband, intense, coherent transition radiation at terahertz frequencies, generated as the highly compressed electron bunches in Linear Coherent Light Source (LCLS) pass through a thin metal foil. The foil is inserted at 45{sup o} to the electron beam, 31 m downstream of the undulator. The THz emission passes downward through a diamond window to an optical table below the beamline. A fully compressed 350-pC bunch produces up to 0.5 mJ in a nearly half-cycle pulse … more
Date: November 8, 2011
Creator: Fisher, Alan S; /SLAC, LCLS; Durr, Hermann; /SIMES, Stanford /SLAC, PULSE; Lindenberg, Aaron; Stanford U., Materials Sci.Dept. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Time-Resolved Synchrotron X-ray Diffraction on Pulse Laser Heated Iron in Diamond Anvil Cell

Description: The authors present time-resolved synchrotron x-ray diffraction to probe the {var_epsilon}-{delta} phase transition of iron during pulse-laser heating in a diamond anvil cell. The system utilizes a monochromatic synchrotron x-ray beam, a two-dimensional pixel array x-ray detector and a dual beam, double side laser-heating system. Multiple frames of the diffraction images are obtained in real-time every 22 ms over 500 ms of the entire pulse heating period. The results show the structural evoluti… more
Date: September 21, 2011
Creator: Yoo, C. S.; Wei, H.; Dias, R.; Shen, G.; Smith, J.; Chen, J. Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Synthesis and characterization of a nanocrystalline diamond aerogel

Description: Aerogel materials have myriad scientific and technological applications due to their large intrinsic surface areas and ultralow densities. However, creating a nanodiamond aerogel matrix has remained an outstanding and intriguing challenge. Here we report the high-pressure, high-temperature synthesis of a diamond aerogel from an amorphous carbon aerogel precursor using a laser-heated diamond anvil cell. Neon is used as a chemically inert, near-hydrostatic pressure medium that prevents collapse o… more
Date: July 6, 2011
Creator: Pauzauskie, Peter J.; Crowhurst, Jonathan C.; Worsley, Marcus A.; Laurence, Ted A.; Kilcoyne, A. L. David; Wang, Yinmin et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Novel Way to Characterize Metal-Insulator-Metal Devices via Nanoindentation: Preprint

Description: Metal-Insulator-Metal (MIM) devices are crucial components for applications ranging from optical rectennas for harvesting sunlight to infrared detectors. To date, the relationship between materials properties and device performance in MIM devices is not fully understood, partly due to the difficulty in making and reproducing reliable devices. One configuration that is popular due to its simplicity and ease of fabrication is the point-contact diode where a metal tip serves as one of the metals i… more
Date: July 1, 2011
Creator: Periasamy, P.; Packard, C. E.; O?Hayre, R. P.; Berry, J. J.; Parilla, P. A. & Ginley, D. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Understanding of Defect Physics in Polycrystalline Photovoltaic Materials: Preprint

Description: The performance of thin-film solar cells is influenced by the quality of interfaces and formation of defects such as point defects, stacking faults, twins, dislocations, and grain boundaries. It is important to understand the defect physics so that appropriate methods may be developed to suppress the formation of harmful defects. Here, we review our understanding of defect physics in thin-film photovoltaic (PV) materials such as Si, CdTe, Cu(In,Ga)Se2 (CIGS), Cu2ZnSnSe2 (CZTSe), and Cu2ZnSnS2 (… more
Date: July 1, 2011
Creator: Yan, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

COMPARISON OF THE ACCURACY OF VARIOUS SPATIAL DISCRETIZATION SCHEMES OF THE DISCRETE ORDINATES EQUATIONS IN 2D CARTESIAN GEOMETRY

Description: We present a comprehensive error estimation of four spatial discretization schemes of the two-dimensional Discrete Ordinates (SN) equations on Cartesian grids utilizing a Method of Manufactured Solution (MMS) benchmark suite based on variants of Larsen’s benchmark featuring different orders of smoothness of the underlying exact solution. The considered spatial discretization schemes include the arbitrarily high order transport methods of the nodal (AHOTN) and characteristic (AHOTC) types, the d… more
Date: May 1, 2011
Creator: Schunert, Sebastian; Azmy, Yousry Y. & Fournier, Damien
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plasma Sprayed Pour Tubes and Other Melt Handling Components for Use in Gas Atomization

Description: Ames Laboratory has successfully used plasma sprayed ceramic components made from yttria stabilized zirconia as melt pouring tubes for gas atomization for many years. These tubes have proven to be strong, thermal shock resistant and versatile. Various configurations are possible both internally and externally. Accurate dimensions are achieved internally with a machined fugitive graphite mandrel and externally by diamond grinding. The previous study of the effect of spray parameters on density w… more
Date: April 1, 2011
Creator: Byrd, David; Rieken, Joel; Heidloff, Andy; Besser, Matthew & Anderson, Iver
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Progress on diamond amplified photo-cathode

Description: Two years ago, we obtained an emission gain of 40 from the Diamond Amplifier Cathode (DAC) in our test system. In our current systematic study of hydrogenation, the highest gain we registered in emission scanning was 178. We proved that our treatments for improving the diamond amplifiers are reproducible. Upcoming tests planned include testing DAC in a RF cavity. Already, we have designed a system for these tests using our 112 MHz superconducting cavity, wherein we will measure DAC parameters, … more
Date: March 28, 2011
Creator: Wang, E.; Ben-Zvi, Ilan; Burrill, A.; Kewisch, J.; Chang, X.; Rao, T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

APPLICATIONS OF BIOTECHNOLOGY IN DEVELOPMENT OF BIOMATERIALS: NANOTECHNOLOGY AND BIOFILMS

Description: Biotechnology is the application of biological techniques to develop new tools and products for medicine and industry. Due to various properties including chemical stability, biocompatibility, and specific activity, e.g. antimicrobial properties, many new and novel materials are being investigated for use in biosensing, drug delivery, hemodialysis, and other medical applications. Many of these materials are less than 100 nanometers in size. Nanotechnology is the engineering discipline encompass… more
Date: November 29, 2010
Creator: Brigmon, R.; Berry, T. & Narayan, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure

Description: Unlike the ferropnictide superconductors, which crystallize in a tetragonal crystal structure, binary FeAs forms in an orthorhombic crystal structure, where the local atomic environment resembles a highly distorted variant of the FeAs{sub 4} tetrahedral building block of the ferropnictide superconductors. However, like the parent compounds of the ferropnictide superconductors, FeAs undergoes magnetic ordering at low temperatures, with no evidence favoring a superconducting ground state at ambie… more
Date: November 10, 2010
Creator: Jeffries, J R; Butch, N P; Cynn, H; Saha, S R; Kirshenbaum, K; Weir, S T et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A diamond detector for inertial confinement fusion X-ray bang-time measurements at the National Ignition Facility

Description: An instrument has been developed to measure X-ray bang-time for inertial confinement fusion capsules; the time interval between the start of the laser pulse and peak X-ray emission from the fuel core. The instrument comprises chemical vapor deposited polycrystalline diamond photoconductive X-ray detectors with highly ordered pyrolytic graphite X-ray monochromator crystals at the input. Capsule bang-time can be measured in the presence of relatively high thermal and hard X-ray background compone… more
Date: November 9, 2010
Creator: MacPhee, A. G.; Brown, C.; Burns, S.; Celeste, J.; Glenzer, S. H.; Hey, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Overview of Recent Tritium Experiments in TPE

Description: Tritium retention in plasma-facing components influences the design, operation, and lifetime of fusion devices such as ITER. Most of the retention studies were carried out with the use of either hydrogen or deuterium. Tritium Plasma Experiment is a unique linear plasma device that can handle radioactive fusion fuel of tritium, toxic material of beryllium, and neutron-irradiated material. A tritium depth profiling method up to mm range was developed using a tritium imaging plate and a diamond wi… more
Date: October 1, 2010
Creator: Shimada, Masashi; Otsuka, T.; Pawelko, R. J.; Calderoni, P. & Sharpe, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of stripper options for FRIB

Description: The US Department of Energy Facility for Rare Isotope Beams (FRIB) at Michigan State University includes a heavy ion superconducting linac capable of accelerating all ions up to uranium with energies higher than 200 MeV/u and beam power up to 400 kW. To achieve these goals with present ion source performance it is necessary to accelerate simultaneously two charge states of uranium from the ion source in the first section of the linac. At an energy of approximately 16.5 MeV/u it is planned to st… more
Date: September 12, 2010
Creator: Marti, F.; Hershcovitch, A.; Momozaki, Y.; Nolen, J.; Reed, C. & Thieberger, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Booster and AGS transverse emittance during the 2006 and 2009 polarized proton runs

Description: This note is an overview of issues relating to transverse polarized proton emittance in the Booster and AGS. It also compares the transverse emittance during the FY09 polarized proton run with it during the FY06 run as several changes were made for the FY09 run in an attempt to reduce the transverse emittance coming out of the AGS. The FY06 run is used for comparison because it was relatively long, and it's believed that the performance of the injectors for polarized protons, up until FY09, was… more
Date: September 1, 2010
Creator: Zeno, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chip-Scale Nanofabrication of Single Spins and Spin Arrays in Diamond

Description: We demonstrate a technique to nanofabricate nitrogen vacancy (NV) centers in diamond based on broad-beam nitrogen implantation through apertures in electron beam lithography resist. This method enables high-throughput nanofabrication of single NV centers on sub-100-nm length scales. Secondary ion mass spectroscopy measurements facilitate depth profiling of the implanted nitrogen to provide three-dimensional characterization of the NV center spatial distribution. Measurements of NV center cohere… more
Date: July 2, 2010
Creator: Toyli, David M.; Weis, Christoph D.; Fuchs, D.; Schenkel, Thomas & Awschalom, David D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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