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in creator/contributor: "Smith, T."

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Provably Optimal Parallel Transport Sweeps on Regular Grids

No Description Available.

Date: January 31, 2013

Creator: Adams, M. P.; Adams, M. L.; Hawkins, W. D.; Smith, T.; Rauchwerger, L.; Amato, N. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Plastic Laminate Pulsed Power Development

The desire to move high-energy Pulsed Power systems from the laboratory to practical field systems requires the development of compact lightweight drivers. This paper concerns an effort to develop such a system based on a plastic laminate strip Blumlein as the final pulseshaping stage for a 600 kV, 50ns, 5-ohm driver. A lifetime and breakdown study conducted with small-area samples identified Kapton sheet impregnated with Propylene Carbonate as the best material combination of those evaluated. … more

Date: September 1, 2000

Creator: Alexander, Jeff A.; Shope, Steven L.; Pate, Ronald C.; Rinehart, Larry F.; Jojola, John M.; Ruebush, Mitchell H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Optimization of Beam Injection into the First Accelerating Module at TTF With Cavity Dipole Mode Signals

The TESLA Test Facility (TTF) is a user facility for intense VUV-FEL light. The facility is densely equipped with diagnostics, essential in obtaining the necessary beam parameters, in particular the low emittance. However there is no dedicated component for alignment of the beam in the accelerating modules, each containing eight superconducting cavities. Large beam offsets can lead to an increase of the beam emittance. The centering of the beam in these modules is therefore important, mostly at… more

Date: April 10, 2006

Creator: Baboi, N.; Kreps, G.; Schlarb, H.; Wendt, M.; Frisch, J.; McCormick, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH

FLASH (Free Electron Laser in Hamburg) is a user facility for a high intensity VUV-light source [1]. The radiation wavelength is tunable in the range from about 40 to 13 nm by changing the electron beam energy from 450 to 700 MeV. The accelerator is also a test facility for the European XFEL (X-ray Free Electron Laser) to be built in Hamburg [2] and the project study ILC (International Linear Collider) [3]. The superconducting TESLA technology is tested at this facility, together with other acc… more

Date: March 20, 2007

Creator: Baboi, N.; Molloy, S.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nanosecond-Timescale Intra-Bunch-Train Feedback for the Linear Collider: Results of the FONT2 Run

We report on experimental results from the December 2003/January 2004 data run of the Feedback On Nanosecond Timescales (FONT) experiment at the Next Linear Collider Test Accelerator at SLAC. We built a second-generation prototype intra-train beam-based feedback system incorporating beam position monitors, fast analogue signal processors, a feedback circuit, fast-risetime amplifiers and stripline kickers. We applied a novel real-time charge-normalization scheme to account for beam current varia… more

Date: May 11, 2005

Creator: Barlow, R.; Dufau, M.; Kalinin, A.; Myatt, G.; Perry, C.; Burrows, P. N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Incident Analysis Report: B696 MOVER Event, August 19, 2004

On August 19, 2004, three operators [employees of Washington TRU Solutions Central Characterization Project (CCP)] and one Health and Safety Technician [(H&ST), an employee of the University of California (UC)] were working in the mobile characterization unit, known as the Mobile Visual Examination and Repackaging Unit (MOVER). The unit, which was located in the Decontamination and Waste Treatment Facility (DWTF) Yard, uses a glovebox to repackage Transuranic (TRU) drums. Work was in progre… more

Date: April 27, 2005

Creator: Beach, D R; Carr, S L; Anderson, B L; Lewis, J S; Merrigan, J R; Richards, J D et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Incident Analysis Report: B696 MOVER Event, August 19, 2004

Date: November 11, 2004

Creator: Beach, D. R.; Carr, S.; Anderson, B.; Lewis, J.; Merrigan, J.; Richards, J. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of the low return loss 340-size ceramic window for the APS linac.

The Advanced Photon Source (APS) linac high-power switching system makes use of 340-size waveguide components. These components include vacuum-grade furnace-brazed transitions, pressurized-grade aluminum 340-size switches, and more recently 340-size ceramic windows. The fabrication of these 340-size windows proceeded with brazing of ceramic membrane to thin-walled copper sleeves and real-time network analyzer testing performed by the ASD (Accelerator Systems Division) RF (Radio Frequency) Group… more

Date: October 10, 2002

Creator: Berg, S.; Bromberek, D.; Goeppner, G.; Haase, A.; Hoyt, J.; Michalek, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the ATF Damping Ring BPM Upgrade Project

A substantial upgrade of the beam position monitors (BPM) at the ATF (Accelerator Test Facility) damping ring is currently in progress. Implementing digital read-out signal processing techniques in line with an optimized, low-noise analog downconverter, a resolution well below 1 mum could be demonstrated at 20 (of 96) upgraded BPM stations. The narrowband, high resolution BPM mode permits investigation of all types of non-linearities, imperfections and other obstacles in the machine which may l… more

Date: December 1, 2011

Creator: Briegel, C.; Eddy, N.; Haynes, B.; May, J.; McCormick, D.; Nelson, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tests of the FONT3 Linear Collider Intra-Train Beam Feedback System at the ATF

We report preliminary results of beam tests of the FONT3 Linear Collider intra-train position feedback system prototype at the Accelerator Test Facility at KEK. The feedback system incorporates a novel beam position monitor (BPM) processor with a latency below 5 nanoseconds, and a kicker driver amplifier with similar low latency. The 56 nanosecond-long bunchtrain in the ATF extraction line was used to test the prototype BPM processor. The achieved latency will allow a demonstration of intra-tra… more

Date: March 14, 2006

Creator: Burrows, P. N.; Christian, G.; Clarke, C.; Hartin, A.; Dabiri Khah, H.; Molloy, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurements of Intra-Beam Scattering at Low Emittance in the Advanced Light Source

The beam emittance at the interaction point of linear colliders is expected to be strongly influenced by the emittance of the beams extracted from the damping rings. Intra-beam scattering (IBS) potentially limits the minimum emittance of low-energy storage rings, and this effect strongly influences the choice of energy of damping rings [1]. Theoretical analysis suggests that the NLC damping rings will experience modest emittance growth at 1.98 GeV, however there is little experimental data of I… more

Date: March 13, 2006

Creator: Byrd, J.; Corlett, J.; Nishimura, H.; Robin, D.; De Santis, S.; Steier, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New DIII-D tokamak plasma control system

A state-of-the-art plasma control system has been constructed for use on the DIII-D tokamak to provide high speed real time data acquisition and feedback control of DIII-D plasma parameters. This new system has increased the precision to which discharge shape and position parameters can be maintained and has provided the means to rapidly change from one plasma configuration to another. The capability to control the plasma total energy and the ICRF antenna loading resistance has been demonstrate… more

Date: September 1, 1992

Creator: Campbell, G. L.; Ferron, J. R.; McKee, E.; Nerem, A.; Smith, T; Greenfield, C. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the Short-Pulse X-Ray Project at the Advanced Photon Source

No Description Available.

Date: October 3, 2013

Creator: Carwardine, J.; Fuerst, J. D.; Grelick, A. E.; Kaluzny, J.; Liu, J.; Nassiri, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a raster electronics system for expanding the APT proton beam

A 1700 MeV, 100 mA proton linear accelerator is being designed for Accelerator Production of Tritium (APT). A beam expansion system is required to uniformly irradiate a 19 x 190 cm tritium production target. This paper describes a beam expansion system consisting of eight ferrite dipole magnets to raster the beam in the x- and y-planes and also describes the salient features of the design of the electronics that are unique to the expander. Eight Insulated Gate Bipolar Transistor (IGBT)-based mo… more

Date: December 31, 1998

Creator: Chapelle, S.; Hubbard, E. L.; Smith, T. L.; Schulze, M. E. & Shafer, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The technical viability of alternative blowing agents in polyisocyanurate roof insulation

This paper presents a progress report on field thermal performance measurements on a set of private industry-produced, experimental polyisocyanurate laminate board stock foams blown with CFC-11, HCFC-123, HCFC-141b, 50/50, and 65/35 blends of HCFC-123/HCFC-141b. These boards have been observed for almost 300 days of roof field exposure in East Tennessee. The field data are used to derive an empirical model which can be used to predict effective diffusion coefficients for the air components into… more

Date: January 1, 1990

Creator: Christian, J.E.; Courville, G.E.; Linkous, R.L.; Wendt, R.L.; Graves, R.S. (Oak Ridge National Lab., TN (USA)) & Smith, T.L. (National Roofing Contractors Association, Chicago, IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Effects of Nitrogen on the Interface State Density Near the Conduction Band Edge in 4H and 6H-SiC

Results are reported for the passivation of interface states near the conduction band edge in SiO{sub 2}/SiC MOS capacitors using post-oxidation anneals in nitric oxide, ammonia and forming gas (N{sub 2}5%H{sub 2}). Anneals in nitric oxide and ammonia reduce the interface state density significantly for 4H-SiC, while forming gas anneals are largely ineffective. Results suggest that interface states in SiO{sub 2}/SiC and SiO{sub 2}/SiC have different origins, and a model is described for interfa… more

Date: June 12, 2000

Creator: Chung, G. Y.; Tin, C. C.; Isaacs-Smith, T.; Williams, J. R.; McDonald, K.; DiVentra, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

FACET First Beam Commissioning

No Description Available.

Date: November 21, 2012

Creator: Clarke, C. I.; Colocho, W. S.; Decker, F. J.; Hogan, M. J.; Lipkowitz, N.; Nelson, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Catalytic multi-stage liquefaction (CMSL)

Under contract with the U.S. Department of Energy, Hydrocarbon Technologies, Inc. has conducted a series of eleven catalytic, multi-stage, liquefaction (CMSL) bench scale runs between February, 1991, and September, 1995. The purpose of these runs was to investigate novel approaches to liquefaction relating to feedstocks, hydrogen source, improved catalysts as well as processing variables, all of which are designed to lower the cost of producing coal-derived liquid products. This report summariz… more

Date: November 1, 1996

Creator: Comolli, A. G.; Ganguli, P.; Karolkiewicz, W. F.; Lee, T. L. K.; Pradhan, V. R.; Popper, G. A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Catalytic multi-stage liquefaction (CMSL)

Reported herein are the details and the results of laboratory and bench scale experiments that were conducted at Hydrocarbon Technologies, Inc. under DOE Contract No. DE-AC22-93PC92147 during the period of October 1, 1992, to December 31, 1995. The program results described herein build on the previous technology base and investigating additional methods to improve the economics of producing transportation fuels from coal. This included purely physical parameters, coal treatment and variation i… more

Date: November 1, 1996

Creator: Comolli, A. G.; Ganguli, P.; Karolkiewicz, W. F.; Lee, T. L. K.; Pradhan, V. R.; Popper, G. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Catalytic Two-Stage Liquefaction (CTSL{trademark}) process bench studies and PDU scale-up with sub-bituminous coal. Final report

Reported are the details and results of Laboratory and Bench-Scale experiments using sub-bituminous coal conducted at Hydrocarbon Research, Inc., under DOE Contract No. DE-AC22-88PC88818 during the period October 1, 1988 to December 31, 1992. The work described is primarily concerned with testing of the baseline Catalytic Two-Stage Liquefaction (CTSL{trademark}) process with comparisons with other two stage process configurations, catalyst evaluations and unit operations such as solid separatio… more

Date: March 1, 1993

Creator: Comolli, A. G.; Johanson, E. S.; Karolkiewicz, W. F.; Lee, L. K. T.; Stalzer, R. H. & Smith, T. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Close-coupled Catalytic Two-Stage Liquefaction (CTSL{trademark}) process bench studies. Final report, [October 1, 1988--July 31, 1993]

This is the final report of a four year and ten month contract starting on October 1, 1988 to July 31, 1993 with the US Department of Energy to study and improve Close-Coupled Catalytic Two-Stage Direct Liquefaction of coal by producing high yields of distillate with improved quality at lower capital and production costs in comparison to existing technologies. Laboratory, Bench and PDU scale studies on sub-bituminous and bituminous coals are summarized and referenced in this volume. Details are… more

Date: June 1, 1993

Creator: Comolli, A. G.; Johanson, E. S.; Karolkiewicz, W. F.; Lee, L. K.; Popper, G. A.; Stalzer, R. H. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Catalytic Two-Stage Liquefaction (CTSL) process bench studies with bituminous coal. Final report, [October 1, 1988--December 31, 1992]

Reported herein are the details and results of Laboratory and Bench-Scale experiments using bituminous coal concluded at Hydrocarbon Research, Inc., under DOE contract during the period October 1, 1988 to December 31, 1992. The work described is primarily concerned with the application of coal cleaning methods and solids separation methods to the Catalytic Two-Stage Liquefaction (CTSL) Process. Additionally a predispersed catalyst was evaluated in a thermal/catalytic configuration, and an alter… more

Date: March 1, 1993

Creator: Comolli, A. G.; Johanson, E. S.; Karolkiewicz, W. F.; Lee, L. K.; Stalzer, R. H. & Smith, T. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Catalytic Two-Stage Liquefaction (CTSL{trademark}) process: Laboratory scale studies modelling and technical assessment. Final report, [October 1, 1988--June 30, 1993]

Reported herein are the details and results of Laboratory-Scale experiments using sub-bituminous and bituminous coal concluded at Hydrocarbon Research, Inc., under DOE Contract No. AC22-88PCB8818 during the period October 1, 1988 to June 30, 1993. The work described in this report is primarily concerned with tests on a Laboratory Scale primarily using microautoclaves. Experiments were conducted evaluating coal, solvents, start-up oils, catalysts, thermal treatments, C0{sub 2} addition and sulfu… more

Date: June 1, 1993

Creator: Comolli, A. G.; Johanson, E. S.; Lee, L. K.; Popper, G. A. & Smith, T. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Two-stage, close coupled catalytic liquefaction of coal

During the first quarter of 1990, work was carried out in the microautoclave, microreactor, and Bench-Scale units. An economics analysis on sub-bituminous coal processing at two space velocities was also completed. Several supported catalysts and a sample of iron oxide were screened in the microautoclave unsulfided and sulfided with DMDS and TNPS. A second shipment of Black Thunder coal from Wilsonville, oil agglomerated cleaned Illinois {number sign}6 coal from Homer City, OTISCA cleaned coal … more

Date: September 1, 1990

Creator: Comolli, A. G.; Johanson, E. S.; Panvelker, S. V.; Popper, G. A. & Smith, T. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department