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337 Matching Results

Start Over Year 2002 Day 23rd

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(open access)

EXB-Drift, Current, and Kinetic Effects on Divertor Plasma Profiles During ELMs

The transient heat load on divertor surfaces from Edge-Localized Modes (ELMs) in tokamaks can be very large and thus of concern for a large device such as ITER. Models for kinetic modifications to fluid models are discussed that should allow them to reasonably describe the long mean-free path regime encountered owing to the high electron and ion temperatures in the SOL during large ELMs. A set of two-dimensional (2D) simulations of the dynamic response of the scrape-off layer (SOL) plasma to an ELM is presented. The role of plasma currents and E x B motion is emphasized, which cause large changes in the response compared to models neglecting them.

Date: May 23, 2002

Creator: Rognlien, T.D. & Shimada, M.

Object Type: Article

System: The UNT Digital Library

(open access)

Foaming in Hanford River Protection Project Waste Treatment Plant LAW Evaporation Processes - FY01 Summary Report

The LAW evaporation processes currently being designed for the Hanford River Protection Project Waste Treatment Plant are subject to foaming. Experimental simulant studies have been conducted in an effort to achieve an effective antifoam agent suitable to mitigate such foaming.

Date: July 23, 2002

Creator: Calloway, T.B.

Object Type: Report

System: The UNT Digital Library

(open access)

Machine Vision for Object Detection and Profiling in an Unstructured Environment

The Handling and Sorting System for 55-Gallon Drums (HANDSS-55) is a DOE project to develop an automated method for retrieving items that are not acceptable at the Waste Isolation Pilot Plant (WIPP) from 55-gallon drums of low-level waste. The HANDSS-55 is a modular system that opens drums, sorts the waste, and then repackages the remaining waste in WIPP compliant barrels. The Sorting Station module relies on a non-contact measurement system to quickly provide a 3D profile of the sorting area. It then analyses the 3D profile and a color image to determine the position and orientation of an operator selected waste item. The item is then removed from the sorting area by a robotic arm. The use of both image and profile information for object determination provides a fast, effective method of finding and retrieving selected objects in the unstructured environment of the sorting module.

Date: May 23, 2002

Creator: Kinoshita, R. A. & Walton, M. C.

Object Type: Article

System: The UNT Digital Library

(open access)

Bends and momentum dispersion during final compression in heavy ion fusion drivers

Between the accelerator and fusion chamber the heavy ion beams are subject to a dramatic but vital series of manipulations, some of which are carried out simultaneously and involve large space charge forces. The beams' quality must be maintained at a level sufficient for the fusion application; this general requirement significantly impacts beam line design, especially in the considerations of momentum dispersion. Immediately prior to final focus onto a fusion target, heavy ion driver beams are compressed in length by typically an order of magnitude. This process is simultaneous with bending through large angles to achieve the required target illumination configuration. The large increase in beam current is accommodated by a combination of decreased lattice period, increased beam radius, and increased strength of the beamline quadrupoles. However, the large head-to-tail momentum tilt (up to 5%) needed to compress the pulse results in a very significant dispersion of the pulse centroid from the design axis. General design features are discussed. A principal design goal is to minimize the magnitude of the dispersion while maintaining approximate first order achromaticity through the complete compression/bend system. Configurations of bends and quadrupoles, which achieve this goal while simultaneously maintaining a locally matched beam-envelope, are analyzed.

Date: January 23, 2002

Creator: Lee, Edward P. & Barnard, John J.

Object Type: Article

System: The UNT Digital Library

(open access)

The RIA driver linac.

The driver linac for the U.S. RIA project will be a 1.4 GV superconducting linac capable of accelerating the full mass range of ions from 900 MeV protons to 400 MeV/u uranium, and delivering a cw beam of 400 kW shared by at least two targets simultaneously. Elements of the linac are being developed at several U.S. laboratories. The current status of linac design and development is reviewed with emphasis on changes in the baseline design since the last linac conference.

Date: September 23, 2002

Creator: Shepard, K. W.

Object Type: Article

System: The UNT Digital Library

(open access)

Photo-cathode preparation system of the A0 photo-injector

The A0 Photo-Injector is an electron accelerator located in the AZero high bay area of Fermilab. A pulsed laser system generates electron bunches by the photo-electric effect when hitting a photo-cathode in a 1.5-cell, 1.3 GHz RF gun. A 9-cell, 1.3 GHz superconducting resonant cavity then accelerates the electrons to 15 MeV. The 10 ps time resolved waveform of the laser pulses is transferred to the electron bunches. This report is focused on the first hardware component of this accelerator, the Photo-cathode Preparation System. The reason for its existence is in the nature of the photo-electric material film used: Cs{sub 2}Te (Cesium Telluride), a very reactive compound that once coated on the cathode requires that it be transported and used in ultra high vacuum (UHV), i.e. < 10{sup -9} Torr.

Date: August 23, 2002

Creator: al., Moyses Kuchnir et

Object Type: Report

System: The UNT Digital Library

(open access)

FIREBALL DYNAMICS, ENERGETICS, ABLATION, LUMINOSITY AND FRAGMENTATION MODELING.

None

Date: August 23, 2002

Creator: REVELLE, DOUGLAS O

Object Type: Article

System: The UNT Digital Library

(open access)

Extended Cold Testing of a Russian Pulsating Mixer Pump at the Oak Ridge National Laboratory, Oak Ridge, Tennessee

The effectiveness of a mixer is dependent on the size of the tank to be mixed, the characteristics of the waste, and the operating conditions. Waste tanks throughout the U.S. Department of Energy Complex require mixing and mobilization systems capable of (1) breaking up and suspending materials that are difficult to mix and pump, without introducing additional liquids into the tank; (2) complementing and augmenting the performance of other remotely operated and/or robotic waste retrieval systems; and (3) operating in tanks with various quantities of waste. The Oak Ridge Russian pulsating mixer pump (PMP) system was designed with the flexibility to permit deployment in a variety of cylindrical tanks. The PMP was installed at the Tanks Technology Cold Test Facility at the Oak Ridge National Laboratory (ORNL) to assess the performance of the system over an extended range of operating conditions, including supply pressures up to 175 psig. Previously conducted cold tests proved the applicability of the PMP for deployment in ORNL gunite tank TH-4. The previous testing and hot demonstrations had been limited to operating at air supply pressures of <100 psig. The extended cold testing of the Russian PMP system showed that the system was capable of mobilizing …

Date: December 23, 2002

Creator: Lewis, BE

Object Type: Report

System: The UNT Digital Library

(open access)

Tucker Wireline Open Hole Wireline Logging

The Tucker Wireline unit ran a suite of open hole logs right behind the RMOTC logging contractor for comparison purposes. The tools included Dual Laterolog, Phased Induction, BHC Sonic, and Density-Porosity.

Date: May 23, 2002

Creator: Milliken, M.

Object Type: Report

System: The UNT Digital Library

(open access)

Run scenarios for the linear collider

We have examined how a Linear Collider program of 1000 fb{sup -1} could be constructed in the case that a very rich program of new physics is accessible at {radical}s {le} 500 GeV. We have examined possible run plans that would allow the measurement of the parameters of a 120 GeV Higgs boson, the top quark, and could give information on the sparticle masses in SUSY scenarios in which many states are accessible. We find that the construction of the run plan (the specific energies for collider operation, the mix of initial state electron polarization states, and the use of special e{sup -}e{sup -} runs) will depend quite sensitively on the specifics of the supersymmetry model, as the decay channels open to particular sparticles vary drastically and discontinuously as the underlying SUSY model parameters are varied. We have explored this dependence somewhat by considering two rather closely related SUSY model points. We have called for operation at a high energy to study kinematic end points, followed by runs in the vicinity of several two body production thresholds once their location is determined by the end point studies. For our benchmarks, the end point runs are capable of disentangling most sparticle …

Date: December 23, 2002

Creator: al., M. Battaglia et

Object Type: Article

System: The UNT Digital Library

(open access)

Large scale cluster computing workshop

Recent revolutions in computer hardware and software technologies have paved the way for the large-scale deployment of clusters of commodity computers to address problems heretofore the domain of tightly coupled SMP processors. Near term projects within High Energy Physics and other computing communities will deploy clusters of scale 1000s of processors and be used by 100s to 1000s of independent users. This will expand the reach in both dimensions by an order of magnitude from the current successful production facilities. The goals of this workshop were: (1) to determine what tools exist which can scale up to the cluster sizes foreseen for the next generation of HENP experiments (several thousand nodes) and by implication to identify areas where some investment of money or effort is likely to be needed. (2) To compare and record experimences gained with such tools. (3) To produce a practical guide to all stages of planning, installing, building and operating a large computing cluster in HENP. (4) To identify and connect groups with similar interest within HENP and the larger clustering community.

Date: December 23, 2002

Creator: Skow, Dane & Silverman, Alan

Object Type: Article

System: The UNT Digital Library

(open access)

Texas Register, Volume 27, Number 34, Pages 7665-8056, August 23, 2002

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

Date: August 23, 2002

Creator: Texas. Secretary of State.

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History

Oral History Interview with L. B. England, January 23, 2002

Access: Use of this item is restricted to the UNT Community

Interview with Navy veteran L. B. England. The interview includes England's personal experiences while aboard the battleship USS West Virginia during the Japanese attack at Pearl Harbor on December 7, 1941. England also talks about the death of his brother, Boyd England, who was killed on the West Virginia during the attack. The interview includes an appendix with an article about England.

Date: January 23, 2002

Creator: Marcello, Ronald E. & England, L. B.

Object Type: Book

System: The UNT Digital Library

(open access)

Genetically Modified Foods: Experts View Regimen of Safety Tests as Adequate, but FDA's Evaluation Process Could Be Enhanced

A letter report issued by the General Accounting Office with an abstract that begins "Genetically modified foods pose the same risks to human health as do other foods. These risks include allergens, toxins, and compounds known as antinutrients which inhibit the absorption of nutrients. Before marketing a genetically modified food, company scientists seek to determine whether these foods pose any heightened risks. The Food and Drug Administration (FDA) published guidelines in 1992 to ensure that companies worked with the agency to assess the safety of genetically modified foods. GAO found that FDA's evaluation process could be enhanced by randomly verifying the test data provided and by increasing the transparency of the evaluation process, including communicating more clearly the scientific rationale for FDA's final decision on an assessment of genetically modified food. Scientists expect that genetic modifications will increasingly enhance the nutritional value of genetically modified foods. Although current tests have been adequate for evaluating the few genetically modified foods that have, so far, undergone relatively simple compositional changes, new technologies are being developed to evaluate the increasingly complex compositional changes expected. Monitoring the long-term health risks of genetically modified foods is generally neither necessary nor feasible. No scientific evidence exists, …

Date: May 23, 2002

Creator: United States. General Accounting Office.

Object Type: Report

System: The UNT Digital Library

(open access)

Telecommunications: Many Broadcasters Will Not Meet May 2002 Digital Television Deadline

A letter report issued by the General Accounting Office with an abstract that begins "U. S. broadcast television stations are now switching from analog to digital television (DTV). The transition to digital technologies was sought by many broadcasters and was mandated by Congress and the Federal Communications Commission (FCC). FCC established 2006 as the target date for ending analog transmissions---a deadline later codified by Congress. At least 24 percent of all commercial television stations are now broadcasting a digital signal. However, these stations report little interest in receiving DTV. Transitioning stations reported that funding was one of the most prevalent problems. Seventy-four percent of transitioning stations indicated that the problems they are facing are so significant that they may not be able to begin broadcasting a DTV signal by May 2002, as required. Sixty-eight percent of transitioning stations said that a realistic extension for them would be one year or more. Thirty-one percent of the transitioning stations that said they might miss their May 2002 deadline reported that, if the transition were driven by market forces such as competition, technology, and consumer demand, they likely would not be on the air with a digital signal until after 2010. Another four …

Date: April 23, 2002

Creator: United States. General Accounting Office.

Object Type: Report

System: The UNT Digital Library

(open access)

Contract Management: Guidance Needed for Using Performance-Based Service Contracting

A letter report issued by the General Accounting Office with an abstract that begins "Federal agencies spent $136 billion dollars in 2001 acquiring services ranging from clerical support and consulting services to information technology services, such as network support, and management and operations of government facilities, such as national laboratories. To achieve greater cost savings and better outcomes with this spending, Congress and the administration have encouraged greater use of performance-based contracting. Under this approach, the contracting agency specifies the outcome or result it desires and leaves it to the contractor to decide how best to achieve the desired outcome. Most of the 25 contracts GAO reviewed exhibited at least one or more performance-based attributes, but there was a range in the degree to which they exhibited these attributes."

Date: September 23, 2002

Creator: United States. General Accounting Office.

Object Type: Report

System: The UNT Digital Library