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Accelerator Operators and Software Development
At Thomas Jefferson National Accelerator Facility, accelerator operators perform tasks in their areas of specialization in addition to their machine operations duties. One crucial area in which operators contribute is software development. Operators with programming skills are uniquely qualified to develop certain controls applications because of their expertise in the day-to-day operation of the accelerator. Jefferson Lab is one of the few laboratories that utilizes the skills and knowledge of operators to create software that enhances machine operations. Through the programs written; by operators, Jefferson Lab has improved machine efficiency and beam availability. Because many of these applications involve automation of procedures and need graphical user interfaces, the scripting language Tcl and the Tk toolkit have been adopted. In addition to automation, some operator-developed applications are used for information distribution. For this purpose, several standard web development tools such as perl, VBScript, and ASP are used. Examples of applications written by operators include injector steering, spin angle changes, system status reports, magnet cycling routines, and quantum efficiency measurements. This paper summarizes how the unique knowledge of accelerator operators has contributed to the success of the Jefferson Lab control system. *This work was supported by the U.S. DOE contract No. DE-AC05-84-ER40150.
Date:
November 1, 2001
Creator:
Miller, April & Joyce, Michele
Object Type:
Article
System:
The UNT Digital Library
Accelerator Physics Issues for Future Electron Ion Colliders
Interest continues to grow in the physics of collisions between electrons and heavy ions, and between polarized electrons and polarized protons [1,2,3]. Table 1 compares the parameters of some machines under discussion. DESY has begun to explore the possibility of upgrading the existing HERA-p ring to store heavy ions, in order to collide them with electrons (or positrons) in the HERA-e ring, or from TESLA [4]. An upgrade to store polarized protons in the HERA-p ring is also under discussion [1]. BNL is considering adding polarized electrons to the RHIC repertoire, which already includes heavy and light ions, and polarized protons. The authors of this paper have made a first pass analysis of this ''eRHIC'' possibility [5]. MIT-BATES is also considering electron ion collider designs [6].
Date:
June 18, 2001
Creator:
Peggs, S.; Ben-Zvi, Ilan; Kewisch, J. & Murphy, J.
Object Type:
Article
System:
The UNT Digital Library
Accent and Grouping Structures in the String Quartets of Béla Bartók
The music of Béla Bartók is defined in part by its unique blend of rhythmic vitality and inventiveness, and his string quartets offer a glimpse into a consistency of technique evident throughout his compositional career. Bartók's rhythmic environments are primarily metrical, but many of his rhythmic configurations are placed in such a way as to potentially override established meter. It is necessary, therefore, to institute an analytical means by which the delineation and comparison of rhythmic structures both within and without the metrical context may be accomplished. An analytical method using Timepoint Accent Structures (TAS) allows for the comparison of rhythms resulting from patterns of accent produced by pitch onset, dynamic stress, articulation or any other accentual factors. Timepoint Grouping Structures (TGS) delineate the number of timepoints present in alternating groups/blocks in a texture, thereby allowing for the recognition of patterning created by these larger groups. By applying TAS and TGS analysis, relationships of rhythmic equivalency, rotation, retrograde, complementation, augmentation, diminution, subset, superset, exchange, compression and expansion are clearly confirmed in the string quartets. In addition, symmetrical structures and arithmetic progressions are discovered. In many ways, Bartók's rhythmic organization mimics his procedures of pitch structuring.
Date:
May 2001
Creator:
Bocanegra, Cheryl D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Acceptable Knowledge Summary Report for Mixed TRU Waste Streams: SR-W026-221F-HET-A through D
This document, along with referenced supporting documents provides a defensible and auditable record of acceptable knowledge for the heterogeneous debris mixed transuranic waste streams generated in the FB-Line after January 25, 1990 and before March 20, 1997.
Date:
October 2, 2001
Creator:
Lunsford, G.F.
Object Type:
Report
System:
The UNT Digital Library
Access America E-Gov E-Zine
Access America E-Gov E-Zine tells the stories of how federal employees are using information technology to deliver services to the American people and to improve their own productivity. Their work captures the vision of Vice President Al Gore in his book, Access America: Reengineering Through Information Technology.
Date:
January 3, 2001
Creator:
Woods, Greg & Wood, Patricia
Object Type:
Website
System:
The UNT Digital Library
Accessing the Inaccessible: The Case for Opening up Russia's Closed Cities
The selling of weapons-related nuclear knowledge by Russian scientists for economic gain constitutes a threat to US national security. Some estimate that the number of Russian scientists seeking permanent employment abroad constitute five to ten percent of all researchers who have left the field of science. And, there is concern that those who have left are ''the better minds.'' Moreover, the issue of brain drain concerns not only those who move abroad permanently, but those who still reside in Russia and travel abroad to sell their knowledge. Of particular concern to the US is the potential sale of WMD knowledge by some. To ''mitigate the risk that economic difficulties...might create the temptation for individuals or institutes to sell expertise to countries of proliferation concern and terrorist organizations,'' the Department of Energy launched a Nuclear Cities Initiative (NCI) in 1998 with the goal of creating commercial jobs and economic diversification in the ten closed cities that form the core of Russia's nuclear weapons complex to accommodate the loss of employment in the nuclear weapons industry. However, unless Russia opens access to the areas of its closed cities that are, or could become, involved in commercial activities-while of course carefully controlling access …
Date:
March 21, 2001
Creator:
Ball, D Y
Object Type:
Article
System:
The UNT Digital Library
Accidental Contamination of Samples Used in Canadian Lynx Study Rendered the Study's Preliminary Conclusion Invalid
Correspondence issued by the General Accounting Office with an abstract that begins "This report discusses the validity of the results of a 1998 study of the Canadian lynx. The Forest Service contracted with Dr. John Weaver of the Wildlife Conservation Society in New York City to help survey the Canadian lynx in the Cascade Mountains of Washington and Oregon. In a March 1999 interim report, Dr. Weaver concluded that the Canadian lynx lives in some forests in Washington and Oregon. In March 2000, the Fish and Wildlife Service placed the lynx on its list of threatened species in the forested portions of 13 states, including Washington and Oregon. Issues have since been raised about whether the study's results were falsified. GAO found no evidence that the study was deliberately falsified."
Date:
August 14, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Accounting Data to Web Interface Using PERL
This document will explain the process to create a web interface for the accounting information generated by the High Performance Storage Systems (HPSS) accounting report feature. The accounting report contains useful data but it is not easily accessed in a meaningful way. The accounting report is the only way to see summarized storage usage information. The first step is to take the accounting data, make it meaningful and store the modified data in persistent databases. The second step is to generate the various user interfaces, HTML pages, that will be used to access the data. The third step is to transfer all required files to the web server. The web pages pass parameters to Common Gateway Interface (CGI) scripts that generate dynamic web pages and graphs. The end result is a web page with specific information presented in text with or without graphs. The accounting report has a specific format that allows the use of regular expressions to verify if a line is storage data. Each storage data line is stored in a detailed database file with a name that includes the run date. The detailed database is used to create a summarized database file that also uses run date …
Date:
August 13, 2001
Creator:
Hargeaves, C
Object Type:
Report
System:
The UNT Digital Library
Accounting for Human Resources: Implications for Theory and Practice.
Knowledge workers are an important resource for the typical modern business firm, yet financial reporting ignores such resources. Some researchers contend that the accounting profession has stressed reliability in order to make the accounting appear objective. Others concur, noting that accounting is an insecure profession and adopts strict rules when faced with uncertainty. Accountants have promulgated a strict rule to expense human resource costs, although many know that such resources have future benefits. Some researchers suggest that any discipline must modify its language in order to initiate change toward providing useful social ameliorations. If accounting theorists extend this idea to the accounting lexicon.s description of investments in human resources, investors and other accounting user groups might gain greater insight into how a firm fosters and nourishes human capital. I tested three hypotheses related to this issue by administering an experiment designed to assess financial analysts. perceptions about alternative financial statement treatments of human resources in an investment recommendation task. I predicted that (1) analysts' perceptions of the reliability (relevance) of the information they received would decrease (increase) as the treatment of human resources increasingly violated GAAP (became more current-oriented), (2) analysts exposed to alternative accounting treatments would report a lower …
Date:
December 2001
Creator:
Stovall, Olin Scott
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accounting Principles, Standards, and Requirements: Title 2 Standards Not Superceded by FASAB Issuances
Guidance issued by the General Accounting Office with an abstract that begins "This is one in a series or reports designed to help federal agencies improve or maintain effective internal control, financial management systems, and financial reporting. GAO discusses the status of the 13 remaining standards in Title 2, "Accounting," of the GAO Policy and Procedures Manual for Guidance of Federal Agencies in light of the most recent compendium of Federal Accounting Standards Advisory Board (FASAB) standards and guidance. GAO either (1) reprinted the standards that remain in effect, along with any updated citations to relevant guidance, or (2) provided the citation of current guidance replacing that standard."
Date:
November 1, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Accuracy and reliability of China's energy statistics
Many observers have raised doubts about the accuracy and reliability of China's energy statistics, which show an unprecedented decline in recent years, while reported economic growth has remained strong. This paper explores the internal consistency of China's energy statistics from 1990 to 2000, coverage and reporting issues, and the state of the statistical reporting system. Available information suggests that, while energy statistics were probably relatively good in the early 1990s, their quality has declined since the mid-1990s. China's energy statistics should be treated as a starting point for analysis, and explicit judgments regarding ranges of uncertainty should accompany any conclusions.
Date:
September 14, 2001
Creator:
Sinton, Jonathan E.
Object Type:
Article
System:
The UNT Digital Library
Accuracy of Projection Methods for the Incompressible Navier-Stokes Equations
Numerous papers have appeared in the literature over the past thirty years discussing projection-type methods for solving the incompressible Navier-Stokes equations. A recurring difficulty encountered is the choice of boundary conditions for the intermediate or predicted velocity in order to obtain at least second order convergence. A further issue is the formula for the pressure correction at each timestep. A simple overview is presented here based on recently published results by Brown, Cortez and Minion [2].
Date:
June 12, 2001
Creator:
Brown, D L
Object Type:
Article
System:
The UNT Digital Library
Accuracy of the Quasistatic Method for Two-Dimensional Thermal Reactor Transients with Feedback
An important aspect in the design and safe operation of a nuclear reactor is the behavior of a reactor in a transient, or nonsteady state, condition. This study shows that the quasistatic method is capable of producing highly accurate results, relative to the direct finite-difference method, for two-dimensional thermal reactor transients with feedback.
Date:
October 23, 2001
Creator:
Dodds, H.L. Jr.
Object Type:
Article
System:
The UNT Digital Library
Accurate GPS Time-Linked Data Acquisition System (ATLAS) User's Manual
None
Date:
May 1, 2001
Creator:
BERG,DALE E. & ZAYAS,JOSE R.
Object Type:
Report
System:
The UNT Digital Library
Accurate hydrogen depth profiling by reflection elastic recoil detection analysis
A technique to convert reflection elastic recoil detection analysis spectra to depth profiles, the channel-depth conversion, was introduced by Verda, et al [1]. But the channel-depth conversion does not correct for energy spread, the unwanted broadening in the energy of the spectra, which can lead to errors in depth profiling. A work in progress introduces a technique that corrects for energy spread in elastic recoil detection analysis spectra, the energy spread correction [2]. Together, the energy spread correction and the channel-depth conversion comprise an accurate and convenient hydrogen depth profiling method.
Date:
January 1, 2001
Creator:
Verda, R. D. (Raymond D.); Tesmer, Joseph R.; Nastasi, Michael Anthony, & Bower, R. W. (Robert W.)
Object Type:
Article
System:
The UNT Digital Library
Accurate Hydrogen Depth Profiling by Reflection Elastic Recoil Detection Analysis
None
Date:
July 1, 2001
Creator:
Verda, R. D.; Tesmer, J. R. & Al, Et
Object Type:
Article
System:
The UNT Digital Library
Achieving closure at Fernald
When Fluor Fernald took over the management of the Fernald Environmental Management Project in 1992, the estimated closure date of the site was more than 25 years into the future. Fluor Fernald, in conjunction with DOE-Fernald, introduced the Accelerated Cleanup Plan, which was designed to substantially shorten that schedule and save taxpayers more than $3 billion. The management of Fluor Fernald believes there are three fundamental concerns that must be addressed by any contractor hoping to achieve closure of a site within the DOE complex. They are relationship management, resource management and contract management. Relationship management refers to the interaction between the site and local residents, regulators, union leadership, the workforce at large, the media, and any other interested stakeholder groups. Resource management is of course related to the effective administration of the site knowledge base and the skills of the workforce, the attraction and retention of qualified a nd competent technical personnel, and the best recognition and use of appropriate new technologies. Perhaps most importantly, resource management must also include a plan for survival in a flat-funding environment. Lastly, creative and disciplined contract management will be essential to effecting the closure of any DOE site. Fluor Fernald, together with …
Date:
February 25, 2001
Creator:
Bradburne, John & Patton, Tisha C.
Object Type:
Article
System:
The UNT Digital Library
ACME Algorithms for Contact in a Multiphysics Environment API Version 0.3a
An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.
Date:
April 1, 2001
Creator:
BROWN, KEVIN H.; GLASS, MICHEAL W.; GULLERUD, ARNE S.; HEINSTEIN, MARTIN W.; JONES, REESE E. & SUMMERS, RANDALL M.
Object Type:
Report
System:
The UNT Digital Library
ACME - Algorithms for Contact in a Multiphysics Environment API Version 1.0
An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.
Date:
October 1, 2001
Creator:
BROWN, KEVIN H.; SUMMERS, RANDALL M.; GLASS, MICHEAL W.; GULLERUD, ARNE S.; HEINSTEIN, MARTIN W. & JONES, REESE E.
Object Type:
Report
System:
The UNT Digital Library
Acoustic Monitor for Liquid Solid Slurries Measurements at Low Weight Fractions
The principal objective of the project is to develop an acoustic probe for determining the volume fraction of particles in a flowing suspension. This will include testing the theory of acoustic wave propagation in suspensions and demonstrating the application of the probe by installing it on a flow loop through which a suspension is flowing and determining the particle volume fraction. The signal from the probe must be processed such that the noise arising from the presence of the gas bubbles, if present in the system, is removed to yield an accurate estimate of the particle volume fraction. Once the probe is developed and tested successfully at Syracuse University, it is to be installed and tested in the flow loop at Oak Ridge National Laboratories for surrogate slurries for the Hanford Nuclear site. Particular attention is to be given to testing suspensions with low particle volume fractions since slurries to be transported in nuclear waste processing will have low particle volume fractions.
Date:
June 1, 2001
Creator:
Taularides, L. L. & Sangani, A.
Object Type:
Report
System:
The UNT Digital Library
Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: April-June 2001
Mechanically weak formations, such as chalks, high porosity sandstones, and marine sediments, pose significant problems for oil and gas operators. Problems such as compaction, subsidence, and loss of permeability can affect reservoir production operations. For example, the unexpected subsidence of the Ekofisk chalk in the North Sea required over one billion dollars to re-engineer production facilities to account for losses created during that compaction (Sulak 1991). Another problem in weak formations is that of shallow water flows (SWF). Deep water drilling operations sometimes encounter cases where the marine sediments, at shallow depths just below the seafloor, begin to uncontrollably flow up and around the drill pipe. SWF problems created a loss of $150 million for the Ursa development project in the U.S. Gulf Coast SWF (Furlow 1998a,b; 1999a,b). The goal of this project is to provide a database on both the rock mechanical properties and the geophysical properties of weak rocks and sediments. These could be used by oil and gas companies to detect, evaluate, and alleviate potential production and drilling problems. The results will be useful in, for example, pre-drill detection of events such as SWF's by allowing a correlation of seismic data (such as hazard surveys) to rock …
Date:
July 1, 2001
Creator:
Scott, Thurman E., Jr.; Abousleiman, Younane & Zaman, Musharraf
Object Type:
Report
System:
The UNT Digital Library
Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: January-March 2001
The oil and gas industry has encountered significant problems in the production of oil and gas from weak rocks (such as chalks and limestones) and from unconsolidated sand formations. Problems include subsidence, compaction, sand production, and catastrophic shallow water sand flows during deep water drilling. Together these cost the petroleum industry hundreds of millions of dollars annually. The goals of this first quarterly report is to document the progress on the project to provide data on the acoustic imaging and mechanical properties of soft rock and marine sediments. The project is intended to determine the geophysical (acoustic velocities) rock properties of weak, poorly cemented rocks and unconsolidated sands. In some cases these weak formations can create problems for reservoir engineers. For example, it cost Phillips Petroleum 1 billion dollars to repair of offshore production facilities damaged during the unexpected subsidence and compaction of the Ekofisk Field in the North Sea (Sulak 1991). Another example is the problem of shallow water flows (SWF) occurring in sands just below the seafloor encountered during deep water drilling operations. In these cases the unconsolidated sands uncontrollably flow up around the annulus of the borehole resulting in loss of the drill casing. The $150 million …
Date:
April 1, 2001
Creator:
Scott, Thurman E., Jr.; Zaman, Musharraf & Abousleiman, Younane
Object Type:
Report
System:
The UNT Digital Library
Acoustical Imaging and Mechanical Properties of Soft Rock and Marine Sediments Progress Report: October-December 2001
During this phase of the project the research team concentrated on acquisition of acoustic emission data from the high porosity rock samples. The initial experiments indicated that the acoustic emission activity from high porosity Danian chalk were of a very low amplitude. Even though the sample underwent yielding and significant plastic deformation the sample did not generate significant AE activity. This was somewhat surprising. These initial results call into question the validity of attempting to locate AE activity in this weak rock type. As a result the testing program was slightly altered to include measuring the acoustic emission activity from many of the rock types listed in the research program. The preliminary experimental results indicate that AE activity in the sandstones is much higher than in the carbonate rocks (i.e., the chalks and limestones). This observation may be particularly important for planning microseismic imaging of reservoir rocks in the field environment. The preliminary results suggest that microseismic imaging of reservoir rock from acoustic emission activity generated from matrix deformation (during compaction and subsidence) would be extremely difficult to accomplish.
Date:
January 31, 2001
Creator:
Scott, Thurman E., Jr.; Abousleiman, Younane & Zaman, Musharraf
Object Type:
Report
System:
The UNT Digital Library
Acquisition and processing of multiparametric information from apixelmatrix
This paper addresses the design of a system intended to readout multiparametric information from a matrix of pixels. The system presented here acquires the charge associated with the signal and provides a timing information from each pixel. Although it lends itself to a broad range of time-correlated imaging situations involving any kind of pixel matrices, the design constraints assumed here are particularly tailored to the application with pixels that sense the output charge distribution from a Micro Channel Plate (MCP). The combination of a microchannel plate and a pixel matrix is an extremely versatile detector and the readout system must be able to fully exploit the intrinsically high position resolution and time accuracy featured by the MCP. The behavior of the readout system described in this paper is based upon advanced concepts to meet the above application requirements and is believed to provide a significant functional improvement over the conventional pixel systems.
Date:
February 1, 2001
Creator:
Manfredi, P.F.; Millaud, J.E. & Sushkov, V.V.
Object Type:
Article
System:
The UNT Digital Library