Month

Language

[Man speaking at podium with NALEO emblem]

NALEO is the National Association of Latino Elected and Appointed Officials.
Date: June 26, 2006
Creator: Castillo, José L.
Object Type: Photograph
System: The Portal to Texas History
Texas Attorney General Opinion: GA-0441 (open access)

Texas Attorney General Opinion: GA-0441

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification: Authority of a municipality to lease its oil, gas and mineral property and the terms under which it may do so.
Date: June 26, 2006
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Export Controls: Improvements to Commerce's Dual-Use System Needed to Ensure Protection of U.S. Interests in the Post-9/11 Environment (open access)

Export Controls: Improvements to Commerce's Dual-Use System Needed to Ensure Protection of U.S. Interests in the Post-9/11 Environment

A letter report issued by the Government Accountability Office with an abstract that begins "In regulating exports of dual-use items, which have both commercial and military applications, the Department of Commerce's Bureau of Industry and Security (BIS) seeks to allow U.S. companies to compete globally while minimizing the risk of items falling into the wrong hands. In so doing, BIS faces the challenge of weighing U.S. national security and economic interests, which at times can be divergent or even competing. In light of the September 2001 terror attacks, GAO was asked to examine BIS's dual-use export control system. In response, GAO is reporting on BIS's (1) evaluations of and changes to the system, (2) screening of export license applications against its watchlist, and (3) actions to correct weaknesses previously identified by GAO."
Date: June 26, 2006
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Personal Information: Key Federal Privacy Laws Do Not Require Information Resellers to Safeguard All Sensitive Data (open access)

Personal Information: Key Federal Privacy Laws Do Not Require Information Resellers to Safeguard All Sensitive Data

A letter report issued by the Government Accountability Office with an abstract that begins "The growth of information resellers--companies that collect and resell publicly available and private information on individuals--has raised privacy and security concerns about this industry. These companies collectively maintain large amounts of detailed personal information on nearly all American consumers, and some have experienced security breaches in recent years. GAO was asked to examine (1) financial institutions' use of resellers; (2) federal privacy and security laws applicable to resellers; (3) federal regulators' oversight of resellers; and (4) regulators' oversight of financial institution compliance with privacy and data security laws. To address these objectives, GAO analyzed documents and interviewed representatives from 10 information resellers, 14 financial institutions, 11 regulators, industry and consumer groups, and others."
Date: June 26, 2006
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
[Historic Marker Application: Ott Hotel] (open access)

[Historic Marker Application: Ott Hotel]

Application materials submitted to the Texas Historical Commission requesting a historic marker for the Ott Hotel, in Liberty, Texas. The materials include the inscription text of the marker, narrative, and photographs.
Date: June 26, 2006
Creator: Texas Historical Commission
Object Type: Text
System: The Portal to Texas History
U.S. Assistance to the Former Soviet Union (open access)

U.S. Assistance to the Former Soviet Union

Since 1992, the United States has provided more than $28 billion in assistance to the 12 states of the former Soviet Union (FSU). It continues to provide nearly $2 billion annually. This report describes the broad framework of U.S. assistance programs and policies in the region and then focuses on the FREEDOM Support Act (FSA) account under the foreign operations budget which, encompassing all U.S. objectives in the region, has often been the means by which Congress has expressed its views and sought to influence policy.
Date: June 26, 2006
Creator: Tarnoff, Curt
Object Type: Report
System: The UNT Digital Library
Nonproliferation and Threat Reduction Assistance: U.S. Programs in the Former Soviet Union (open access)

Nonproliferation and Threat Reduction Assistance: U.S. Programs in the Former Soviet Union

None
Date: June 26, 2006
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Steel: Price and Policy Issues (open access)

Steel: Price and Policy Issues

None
Date: June 26, 2006
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Security Classified and Controlled Information: History, Status, and Emerging Management Issues (open access)

Security Classified and Controlled Information: History, Status, and Emerging Management Issues

None
Date: June 26, 2006
Creator: Relyea, Harold C.
Object Type: Report
System: The UNT Digital Library
Vertical Beam Size Control in TLS and TPS (open access)

Vertical Beam Size Control in TLS and TPS

Vertical beam size control is an important issue in the light source operations. The horizontal-vertical betatron coupling and vertical dispersion were measured and corrected to small values in the TLS 1.5 GeV storage ring. Estimated beam sizes are compared with the measured values. By employing an effective transverse damping system, the vertical beam blow-up due to transverse coherent instabilities, such as the fast-ion beam instability, was suppressed. As a result, the light source is very stable. In NSRRC we are designing an ultra low emittance 3-GeV storage ring and its designed vertical beam size could be as small as a few microns. The ground and mechanic vibration effects, and coherent instabilities could spoil the expected photon brightness due to blow-up of the vertical beam size if not well taken care of. The contributions of these effects to vertical beam size increase will be evaluated and the counter measures to minimize them will be proposed and reported in this paper.
Date: June 26, 2006
Creator: Kuo, C. C.; Chen, J. R.; Chou, P. J.; Chang, H. P.; Hsu, K. T.; Luo, G. H. et al.
Object Type: Article
System: The UNT Digital Library
Criticality Safety Evaluation of a LLNL Training Assembly for Criticality Safety (TACS) (open access)

Criticality Safety Evaluation of a LLNL Training Assembly for Criticality Safety (TACS)

Hands-on experimental training in the physical behavior of multiplying systems is one of ten key areas of training required for practitioners to become qualified in the discipline of criticality safety as identified in DOE-STD-1135-99, ''Guidance for Nuclear Criticality Safety Engineer Training and Qualification''. This document is a criticality safety evaluation of the training activities (or operations) associated with HS-3200, ''Laboratory Class for Criticality Safety''. These activities utilize the Training Assembly for Criticality Safety (TACS). The original intent of HS-3200 was to provide LLNL fissile material handlers with a practical hands-on experience as a supplement to the academic training they receive biennially in HS-3100, ''Fundamentals of Criticality Safety'', as required by ANSI/ANS-8.20-1991, ''Nuclear Criticality Safety Training''. HS-3200 is to be enhanced to also address the training needs of nuclear criticality safety professionals under the auspices of the NNSA Nuclear Criticality Safety Program.
Date: June 26, 2006
Creator: Heinrichs, D P
Object Type: Report
System: The UNT Digital Library
FURTHER DEVELOPMENT OF A LOW INDUCTANCE METAL VAPOR VACUUM ARC (LIZ-MEVVA) ION SOURCE. (open access)

FURTHER DEVELOPMENT OF A LOW INDUCTANCE METAL VAPOR VACUUM ARC (LIZ-MEVVA) ION SOURCE.

None
Date: June 26, 2006
Creator: Johnson, B. M.; Hershcovitch, A. & Al., Et
Object Type: Article
System: The UNT Digital Library
COMPARISON OF DOUBLE BEND AND TRIPLE BEND ACHROMATIC LATTICE STRUCTURES AND NSLS-II. (open access)

COMPARISON OF DOUBLE BEND AND TRIPLE BEND ACHROMATIC LATTICE STRUCTURES AND NSLS-II.

The Double Bend Achromatic (DBA) and the Triple Bend Achromatic (TBA) lattice have been studied rather extensively for use for the NSLS-II storage ring. The advantage of the TBA compared to the DBA in terms of emittance per period is well known. However, the DBA has the advantage of greater number of ID straight sections for the users and maybe easier to tune the dispersive section for reduced chromatic sextupole strength. We present a comparison of these lattices based on optimization of the non-linear driving terms using high order achromatic cancellation of driving terms of the nonlinear lattice.
Date: June 26, 2006
Creator: Kramer, S. L.; Krinsky, S. & Bengtsson, J.
Object Type: Article
System: The UNT Digital Library
Optimizing the Dynamic Aperture for Triple Bend Achromatic Lattices. (open access)

Optimizing the Dynamic Aperture for Triple Bend Achromatic Lattices.

The Triple Bend Achromatic (TBA) lattice has the potential for lower natural emittance per period than the Double Bend Achromatic (DBA) lattice for high brightness light sources. However, the DBA has been chosen for 3rd generation light sources more often due to the higher number of undulator straight section available for a comparable emittance. The TBA has considerable flexibility in linear optics tuning while maintaining this emittance advantage. We have used the tune and chromaticity flexibility of a TBA lattice to minimize the lowest order nonlinearities to implement a 3rd order achromatic tune, while maintaining a constant emittance. This frees the geometric sextupoles to counter the higher order nonlinearities. This procedure is being used to improve the nonlinear dynamics of the TBA as a proposed lattice for NSLS-II facility. The flexibility of the TBA lattice will also provide for future upgrade capabilities of the beam parameters.
Date: June 26, 2006
Creator: Kramer, S. L. & Bengtsson, J.
Object Type: Article
System: The UNT Digital Library
Finite Element Models for Computing Seismic Induced Soil Pressures on Deeply Embedded Nuclear Power Plant Structures. (open access)

Finite Element Models for Computing Seismic Induced Soil Pressures on Deeply Embedded Nuclear Power Plant Structures.

PAPER DISCUSSES COMPUTATIONS OF SEISMIC INDUCED SOIL PRESSURES USING FINITE ELEMENT MODELS FOR DEEPLY EMBEDDED AND OR BURIED STIFF STRUCTURES SUCH AS THOSE APPEARING IN THE CONCEPTUAL DESIGNS OF STRUCTURES FOR ADVANCED REACTORS.
Date: June 26, 2006
Creator: Xu, J.; Costantino, C. & Hofmayer, C.
Object Type: Article
System: The UNT Digital Library
Summary of Coupling and Tune Feedback Results During Rhic Run 6, and Possible Implications for Lhc Commissioning. (open access)

Summary of Coupling and Tune Feedback Results During Rhic Run 6, and Possible Implications for Lhc Commissioning.

Early efforts [1] to implement tune feedback during the acceleration ramp in RHIC were hampered by large betatron coupling, as well as the requirement for large dynamic range. Both problems have been addressed, the first by implementation of continuous measurement of coupling, and the second by the development of an improved analog front end. With these improvements, simultaneous coupling and tune feedback were successfully implemented for acceleration ramp development during RHIC Run 6. During the course of this work it became clear that direct excitation of the betatron resonances by high harmonics of the 60Hz power frequency was an obstacle to making the system fully operational. They report here on these results from RHIC Run 6, and implications for LHC commissioning.
Date: June 26, 2006
Creator: Cameron, P.; Dellapenna, A.; Hoff, L.; Luo, Y.; Marusic, A.; Ptitsyn, V. et al.
Object Type: Article
System: The UNT Digital Library
Analysis of Availability and Reliability in Rhic Operations. (open access)

Analysis of Availability and Reliability in Rhic Operations.

RHIC has been successfully operated for 5 years as a collider for different species, ranging from heavy ions including gold and copper, to polarized protons. We present a critical analysis of reliability data for RHIC that not only identifies the principal factors limiting availability but also evaluates critical choices at design times and assess their impact on present machine performance. RHIC availability data are typical when compared to similar high-energy colliders. The critical analysis of operations data is the basis for studies and plans to improve RHIC machine availability beyond the 50-60% typical of high-energy colliders.
Date: June 26, 2006
Creator: Pilat, F.; Ingrassia, P. & Michnoff, R.
Object Type: Article
System: The UNT Digital Library
Acceleration of Polarized Protons in the AGS With Two Helical Partial Snakes. (open access)

Acceleration of Polarized Protons in the AGS With Two Helical Partial Snakes.

Acceleration of polarized protons in the energy range of 5 to 25 GeV is particularly difficult: the depolarizing resonances are strong enough to cause significant depolarization but full Siberian snakes cause intolerably large orbit excursions and are not feasible in the AGS since straight sections are too short. Recently, two helical partial snakes with double pitch design have been built and installed in the AGS. With careful setup of optics at injection and along the ramp, this combination can eliminate the intrinsic and imperfection depolarizing resonances encountered during acceleration. This paper presents the accelerator setup and preliminary results.
Date: June 26, 2006
Creator: Huang, H.; Ahrens, L. A.; Bai, M.; Bravar, A.; Brown, K.; Courant, E. D. et al.
Object Type: Article
System: The UNT Digital Library
HIGH FIELD SOLENOID FOR MUON COOLING. (open access)

HIGH FIELD SOLENOID FOR MUON COOLING.

Magnets made with high-temperature superconducting (HTS) coils operating at low temperatures have the potential to produce extremely high fields for use in accelerators and beam lines. The specific application of interest that we are proposing is to use a very high field (of the order of 50 Tesla) solenoid to provide a very small beta region for the final stages of cooling for a muon collider. With the commercial availability of HTS conductor based on BSCCO technology with high current carrying capacity at 4.2 K, very high field solenoid magnets should be possible. In this paper we will evaluate the technical issues associated with building this magnet. In particular we address how to mitigate the high Lorentz stresses associated with this high field magnet.
Date: June 26, 2006
Creator: Kahn, S. A.; Alsharo'a, M.; Hanlet, P.; Johnson, R. P.; Kuchnir, M.; Newsham, F. et al.
Object Type: Article
System: The UNT Digital Library
BEAM TRANSPORT LINES FOR THE BSNS. (open access)

BEAM TRANSPORT LINES FOR THE BSNS.

This paper presents the design of two beam transport lines at the BSNS: one is the injection line from the Linac to the RCS and the other is the target line from the RCS to the target station. In the injection beam line, space charge effects, transverse halo collimation, momentum tail collimation and debunching are the main concerned topics. A new method of using triplet cells and stripping foils is used to collimate transverse halo. A long straight section is reserved for the future upgrading linac and debuncher. In the target beam line, large halo emittance, beam stability at the target due to kicker failures and beam jitters, shielding of back-scattering neutrons from the target are main concerned topics. Special bi-gap magnets will be used to reduce beam losses in the collimators in front of the target.
Date: June 26, 2006
Creator: WEI, J.
Object Type: Article
System: The UNT Digital Library
Fast Compensation of Global Linear Coupling in Rhic Using Ac Dipoles. (open access)

Fast Compensation of Global Linear Coupling in Rhic Using Ac Dipoles.

Global linear coupling has been extensively studied in accelerators and several methods have been developed to compensate the coupling coefficient C using skew quadrupole families scans. However, scanning techniques can become very time consuming especially during the commissioning of an energy ramp. In this paper they illustrate a new technique to measure and compensate, in a single machine cycle, global linear coupling from turn-by-turn BPM data without the need of a skew quadrupole scan. The algorithm is applied to RHIC BPM data using AC dipoles and compared with traditional methods.
Date: June 26, 2006
Creator: Calaga, R. & Franchi, A. (Gsi), Tomas, R.(Cern)
Object Type: Article
System: The UNT Digital Library
Procedures and Accuracy Estimates for Beta-Beat Correction in the Lhc. (open access)

Procedures and Accuracy Estimates for Beta-Beat Correction in the Lhc.

The LHC aperture imposes a tight tolerance of 20% on the maximum acceptable beta-beat in the machine. An accurate knowledge of the transfer functions for the individually powered insertion quadrupoles and techniques to compensate beta-beat are key prerequisites for successful operation with high intensity beams. They perform realistic simulations to identify quadrupole errors in LHC and explore possible ways of correction to minimize beta-beat below the 20% level.
Date: June 26, 2006
Creator: Tomas, R.; Bruning, O. (Cern); Calaga, R. & Peggs, S.
Object Type: Article
System: The UNT Digital Library
The MUCOOL RF Program (open access)

The MUCOOL RF Program

Efficient muon cooling requires high RF gradients in the presence of high (3T) solenoidal fields. The Muon Ionization Cooling Experiment (MICE) also requires that the x-ray production from these cavities is low, in order to minimize backgrounds in the particle detectors that must be located near the cavities. These cavities require thin Be windows to ensure the highest fields on the beam axis. In order to develop these cavities, the MUCOOL RF Program was started about 6 years ago. Initial measurements were made on a six-cell cavity and a single-cell pillbox, both operating at 805 MHz. We have now begun measurements of a 201 MHz pillbox cavity. This program has led to new techniques to look at dark currents, a new model for breakdown and a general model of cavity performance based on surface damage. The experimental program includes studies of thin Be windows, conditioning, dark current production from different materials, magnetic-field effects and breakdown.
Date: June 26, 2006
Creator: Norem, J.; Bross, A.; Moretti, A.; Norris, B.; Qian, Z.; Torun, Y. et al.
Object Type: Article
System: The UNT Digital Library
The Interactions of Surface Damage on RF Cavity Operation (open access)

The Interactions of Surface Damage on RF Cavity Operation

Studies of low frequency RF systems for muon cooling has led to a variety of new techniques for looking at dark currents, a new model of breakdown, and, ultimately, a model of RF cavity operation based on surface damage. We find that cavity behavior is strongly influenced by the spectrum of enhancement factors on field emission sites. Three different spectra are involved: one defining the initial state of the cavity, the second determined by the breakdown events, and the third defining the equilibrium produced as a cavity operates at its maximum field. We have been able to measure these functions and use them to derive a wide variety of cavity parameters: conditioning behavior, material, pulse length, temperature, vacuum, magnetic field, pressure, gas dependence. In addition we can calculate the dependence of breakdown rate on surface field and pulse length. This work correlates with data from Atom Probe Tomography. We will describe this model and new experimental data.
Date: June 26, 2006
Creator: Norem, J.; Hassanein, A.; Insepov, Z.; Moretti, A.; Qian, Z.; Bross, A. et al.
Object Type: Article
System: The UNT Digital Library