11.424 Ghz Stripline Transversal Filter for Sub-Picosecond Bunch Timing Measurements (open access)

11.424 Ghz Stripline Transversal Filter for Sub-Picosecond Bunch Timing Measurements

Measurement of time-of-arrival or instantaneous longitudinal position is a fundamental beam diagnostic. We present results from a stripline transversal periodic coupler structure which forms the heart of a sub-ps beam timing detector. This filter structure approximates a sinx/x response in the frequency domain which corresponds to a limited pulse length response in the time domain. These techniques have been used extensively in beam feedback systems at 3 GHz center frequencies with operational single-shot resolutions of 200 fs [1]. We present a new design, based on a 11.424 GHz center frequency, which is intended to offer a factor of four improvement in time resolution. Two-dimensional electromagnetic simulation results are shown, and the design optimization approach leading to the final circuit implementation is illustrated. The prototype circuit has been fabricated on 64mil Rogers 4003 and lab frequency domain and time domain data are compared to the 2-D simulation results. Performance of the prototype circuit is shown with applicability to sub-ps beam measurements in LINAC and FEL applications.
Date: August 26, 2010
Creator: Van Winkle, D.; Young, A. & Fox, J. D.
Object Type: Article
System: The UNT Digital Library
100 Area D4 Project Building Completion Report: December 2008 to December 2009 (open access)

100 Area D4 Project Building Completion Report: December 2008 to December 2009

This report documents the final status of buildings after the completion of D4 activities at the 100 Area of the U.S. Department of Energy Hanford Site from December 1, 2008, to December 31, 2009.
Date: October 26, 2010
Creator: K.G. Finucane, J.P. Harrie
Object Type: Report
System: The UNT Digital Library
2008 East Tennessee Technology Park Annual Illness and Injury Surveillance Report (open access)

2008 East Tennessee Technology Park Annual Illness and Injury Surveillance Report

The U.S. Department of Energy’s (DOE) commitment to assuring the health and safety of its workers includes the conduct of epidemiologic surveillance activities that provide an early warning system for health problems among workers. The Illness and Injury Surveillance Program monitors illnesses and health conditions that result in an absence of workdays, occupational injuries and illnesses, and disabilities and deaths among current workers.
Date: October 26, 2010
Creator: United States. Department of Energy. Office of Illness and Injury Prevention Programs.
Object Type: Report
System: The UNT Digital Library
Accelerated Vehicle Retirement Programs in Japan and South Korea: Background for Congress (open access)

Accelerated Vehicle Retirement Programs in Japan and South Korea: Background for Congress

This report discusses the accelerated vehicle retirement (AVR) programs initiated in 2009 by the United States, Japan, South Korea, and other industrial nations (commonly known in the U.S. as the "cash for clunkers" program). The U.S. program began in June 2009, when President Obama signed the Consumer Assistance to Recycle and Save (CARS) Act. The report discusses how these various AVR programs affected the automobile industries in the U.S., Japan, and South Korea, specifically. Neither Japan nor South Korea imports large numbers of foreign vehicles, a circumstance not much altered by AVR program implementation.
Date: October 26, 2010
Creator: Canis, Bill; Grimmett, Jeanne J.; Platzer, Michaela D. & Yacobucci, Brent D.
Object Type: Report
System: The UNT Digital Library
Acceso al Idioma: Ciertos organismos pueden mejorar los servicios que prestan a las personas que tienen dominio insuficiente del ingles (Spanish Language Summary) (open access)

Acceso al Idioma: Ciertos organismos pueden mejorar los servicios que prestan a las personas que tienen dominio insuficiente del ingles (Spanish Language Summary)

A letter report issued by the Government Accountability Office with an abstract that begins "This is the Spanish language highlights associated with GAO-10-91. Executive Order 13166 (August 11, 2000) directs each federal agency to improve access to federal programs and services for persons with limited English proficiency (LEP). Using guidance issued by DOJ, agencies are generally required to develop recipient guidance and/or an LEP plan outlining steps for ensuring that LEP persons can access federal services and programs. As requested, GAO (1) determined which agencies have completed their recipient guidance and LEP plan, (2) assessed the extent to which the selected agencies have implemented the Executive Order consistent with DOJ's guidance, and (3) examined DOJ's and the three selected agencies' efforts to enhance collaboration. GAO analyzed the Executive Order and agencies' recipient guidance and plans posted on LEP.gov; selected the IRS, FEMA, and SBA for this review because of the amount and significance of their interaction with LEP persons; and reviewed documentation of agencies' collaborative efforts to provide access to federal services. (Spanish Language Summary)"
Date: April 26, 2010
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Access to Broadband Networks: The Net Neutrality Debate (open access)

Access to Broadband Networks: The Net Neutrality Debate

This report discusses the current debate over "net neutrality." While there is no single accepted definition of "net neutrality," most agree that any such definition should include the general principles that owners of the networks that compose and provide access to the Internet should not control how consumers lawfully use that network, and they should not be able to discriminate against content provider access to that network.
Date: January 26, 2010
Creator: Gilroy, Angele A.
Object Type: Report
System: The UNT Digital Library
AdS/CFT and Large-N Volume Independence (open access)

AdS/CFT and Large-N Volume Independence

We study the Eguchi-Kawai reduction in the strong-coupling domain of gauge theories via the gravity dual of N=4 super-Yang-Mills on R{sup 3} x S{sup 1}. We show that D-branes geometrize volume independence in the center-symmetric vacuum and give supergravity predictions for the range of validity of reduced large-N models at strong coupling.
Date: August 26, 2010
Creator: Poppitz, Erich; U., /Toronto; Unsal, Mithat & /SLAC /Stanford U., Phys. Dept.
Object Type: Article
System: The UNT Digital Library
Advanced Initiation Systems Manufacturing Level 2 Milestone Completion Summary (open access)

Advanced Initiation Systems Manufacturing Level 2 Milestone Completion Summary

None
Date: August 26, 2010
Creator: Chow, R & Schmidt, M A
Object Type: Report
System: The UNT Digital Library
Afghanistan Casualties: Military Forces and Civilians (open access)

Afghanistan Casualties: Military Forces and Civilians

This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001. OEF actions took place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.
Date: February 26, 2010
Creator: Chesser, Susan G.
Object Type: Report
System: The UNT Digital Library
Alternate Alpha Induced Reactions for NIF Radiochemistry (open access)

Alternate Alpha Induced Reactions for NIF Radiochemistry

Radiochemical analysis of NIF capsule residues has been identified as a potential diagnostic of NIF capsule performance. In particular, alpha-induced nuclear reactions that occur on tracer elements added to the NIF capsule have been shown through simulation to be a very sensitive diagnostic for mix. The short range of the alpha particles makes them representative of the hot spot where they are created through the fusion of deuterium and tritium. Reactions on elements doped into the innermost part of the capsule ablator would therefore be sensitive to material that had mixed into the hot spot. Radiochemical determinations of activated detector elements may perhaps be the only true measure of mix that occurs in a NIF capsule, particularly in cases when the capsule fails.
Date: February 26, 2010
Creator: Shaughnessy, D A; Moody, K J & Bernstein, L A
Object Type: Report
System: The UNT Digital Library
American War and Military Operations Casualties: Lists and Statistics (open access)

American War and Military Operations Casualties: Lists and Statistics

This report is written in response to numerous requests for war casualty statistics and lists of war dead. It provides tables, compiled by sources at the Department of Defense (DOD), indicating the number of casualties among American military personnel serving in principal wars and combat actions.
Date: February 26, 2010
Creator: Leland, Anne & Oboroceanu, Mari-Jana
Object Type: Report
System: The UNT Digital Library
Analytical Data Report of Grab Samples Collected From 200-ZP-1 Remedial Action Wells (open access)

Analytical Data Report of Grab Samples Collected From 200-ZP-1 Remedial Action Wells

This is an analytical data report prepared for CHPRC from grab samples received for 200-ZP-1 operable unit.
Date: February 26, 2010
Creator: Lindberg, Michael J.
Object Type: Report
System: The UNT Digital Library
Animal Waste and Hazardous Substances: Current Laws and Legislative Issues (open access)

Animal Waste and Hazardous Substances: Current Laws and Legislative Issues

The animal sector of agriculture has undergone major changes in the last several decades: organizational changes within the industry to enhance economic efficiency have resulted in larger confined production facilities that often are geographically concentrated. These changes, in turn, have given rise to concerns over the management of animal wastes and potential impact on environmental quality.
Date: July 26, 2010
Creator: Copeland, Claudia
Object Type: Report
System: The UNT Digital Library
Army Corps of Engineers Water Resource Projects: Authorization and Appropriations (open access)

Army Corps of Engineers Water Resource Projects: Authorization and Appropriations

This report summarizes congressional authorization and appropriations processes for the U.S. Army Corps of Engineers. It also discusses agency activities under general authorities.
Date: May 26, 2010
Creator: Carter, Nicole T. & Stern, Charles V.
Object Type: Report
System: The UNT Digital Library
Asian Carp and the Great Lakes Region (open access)

Asian Carp and the Great Lakes Region

This report is on Asian Carp and the Great Lakes Region.
Date: February 26, 2010
Creator: Buck, Eugene H.; Upton, Harold F. & Stern, Charles V.
Object Type: Report
System: The UNT Digital Library
Atmospheric Radiation Measurement Program Climate Research Facility Operation Quarterly Report July 1 - September 30, 2010. (open access)

Atmospheric Radiation Measurement Program Climate Research Facility Operation Quarterly Report July 1 - September 30, 2010.

Individual raw datastreams from instrumentation at the Atmospheric Radiation Measurement (ARM) Climate Research Facility fixed and mobile sites are collected and sent to the Data Management Facility (DMF) at Pacific Northwest National Laboratory (PNNL) for processing in near real-time. Raw and processed data are then sent approximately daily to the ARM Archive, where they are made available to users. For each instrument, we calculate the ratio of the actual number of data records received daily at the Archive to the expected number of data records. The results are tabulated by (1) individual datastream, site, and month for the current year and (2) site and fiscal year (FY) dating back to 1998. The U.S. Department of Energy (DOE) requires national user facilities to report time-based operating data. The requirements concern the actual hours of operation (ACTUAL); the estimated maximum operation or uptime goal (OPSMAX), which accounts for planned downtime; and the VARIANCE [1-(ACTUAL/OPSMAX)], which accounts for unplanned downtime. The OPSMAX time for the fourth quarter of FY2010 for the Southern Great Plains (SGP) site is 2097.60 hours (0.95 2208 hours this quarter). The OPSMAX for the North Slope of Alaska (NSA) locale is 1987.20 hours (0.90 2208) and for the Tropical …
Date: October 26, 2010
Creator: Sisterson, D. L.
Object Type: Report
System: The UNT Digital Library
Axial Anomaly, Dirac Sea, and the Chiral Magnetic Effect (open access)

Axial Anomaly, Dirac Sea, and the Chiral Magnetic Effect

Gribov viewed the axial anomaly as a manifestation of the collective motion of Dirac fermions with arbitrarily high momenta in the vacuum. In the presence of an external magnetic field and a chirality imbalance, this collective motion becomes directly observable in the form of the electric current - this is the chiral magnetic effect (CME). I give an elementary introduction into the physics of CME, and discuss the experimental status and recent developments.
Date: May 26, 2010
Creator: Kharzeev, D.E.
Object Type: Article
System: The UNT Digital Library
Bahrain: Reform, Security, and U.S. Policy (open access)

Bahrain: Reform, Security, and U.S. Policy

This report discusses the current state of Bahrain, which has undergone substantial political reforms since the late 1990s, but which still suffers from tension between the Shiite majority and the Sunni-led government. This report focuses particularly on Bahrain's relationship with Iran and Bahrain's relationship with the United States.
Date: April 26, 2010
Creator: Katzman, Kenneth
Object Type: Report
System: The UNT Digital Library
BDS Thin Film UV Antireflection Laser Damage Competition (open access)

BDS Thin Film UV Antireflection Laser Damage Competition

UV antireflection coatings are a challenging coating for high power laser applications as exemplified by the use of uncoated Brewster's windows in laser cavities. In order to understand the current laser resistance of UV AR coatings in the industrial and university sectors, a double blind laser damage competition was performed. The coatings have a maximum reflectance of 0.5% at 355 nm at normal incidence. Damage testing will be performed using the raster scan method with a 7.5 ns pulse length on a single testing facility to facilitate direct comparisons. In addition to the laser resistance results, details of deposition processes and coating materials will also be shared.
Date: October 26, 2010
Creator: Stolz, C J
Object Type: Article
System: The UNT Digital Library
Bench-Top Impedance Measurements for a Rotatable Copper Collimator for the LHC Phase II Collimation Upgrade (open access)

Bench-Top Impedance Measurements for a Rotatable Copper Collimator for the LHC Phase II Collimation Upgrade

Simulations have been performed in Omega3P to study both trapped modes and impedance contributions of a rotatable collimator for the LHC phase II collimation upgrade. Bench-top stretched coil probe impedance methods are also being implemented for measurements on prototype components to directly measure the low frequency impedance contributions. The collimator design also calls for a RF contact interface at both jaw ends with contact resistance much less than a milliohm in order to limit transverse impedance. DC resistance measurements in a custom built test chamber have been performed to test the performance of this interface.
Date: August 26, 2010
Creator: Smith, Jeffrey Claiborne; Bane, Karl; Doyle, Eric; Keller, Lew; Lundgren, Steve; Markiewicz, Tom et al.
Object Type: Article
System: The UNT Digital Library
Bigger, Better, Faster, More at the LHC (open access)

Bigger, Better, Faster, More at the LHC

Multijet plus missing energy searches provide universal coverage for theories that have new colored particles that decay into a dark matter candidate and jets. These signals appear at the LHC further out on the missing energy tail than two-to-two scattering indicates. The simplicity of the searches at the LHC contrasts sharply with the Tevatron where more elaborate searches are necessary to separate signal from background. The searches presented in this article effectively distinguish signal from background for any theory where the LSP is a daughter or granddaughter of the pair-produced colored parent particle without ever having to consider missing energies less than 400 GeV.
Date: August 26, 2010
Creator: Izaguirre, Eder; /SLAC; Manhart, Michael; /Rutgers U., Piscataway; Wacker, Jay G. & /SLAC
Object Type: Article
System: The UNT Digital Library
Border Security: Key Agencies and Their Missions (open access)

Border Security: Key Agencies and Their Missions

This report briefly describes the role of various agencies in securing the borders of the United States. These agencies are the Bureau of Customs and Border Protection (CBP), the Bureau of Immigrations and Customs Enforcement (ICE), the United States Coast Guard, and the Transportation Security Administration (TSA).
Date: January 26, 2010
Creator: Haddal, Chad C.
Object Type: Report
System: The UNT Digital Library
Bosnia: Current Issues and U.S. Policy (open access)

Bosnia: Current Issues and U.S. Policy

This report presents an overview of the economic and political situation in Bosnia. It starts out by describing the current situation, the negotiations on forming a new central government, the international role in Bosnia, and the last part discusses the implications of U.S. policy.
Date: January 26, 2010
Creator: Woehrel, Steven
Object Type: Report
System: The UNT Digital Library
BPM Design and Impedance Considerations for a Rotatable Collimator for the LHC Collimation Upgrade (open access)

BPM Design and Impedance Considerations for a Rotatable Collimator for the LHC Collimation Upgrade

The Phase II upgrade to the LHC collimation system calls for complementing the 30 high robust Phase I graphite secondary collimators with 30 high Z Phase II collimators. This paper reports on BPM and impedance considerations and measurements of the integrated BPMs in the prototype rotatable collimator to be installed in the Super Proton Synchrotron (SPS) at CERN. The BPMs are necessary to align the jaws with the beam. Without careful design the beam impedance can result in unacceptable heating of the chamber wall or beam instabilities. The impedance measurements involve utilizing both a single displaced wire and two wires excited in opposite phase to disentangle the driving and detuning transverse impedances. Trapped mode resonances and longitudinal impedance are to also be measured and compared with simulations. These measurements, when completed, will demonstrate the device is fully operational and has the impedance characteristics and BPM performance acceptable for installation in the SPS.
Date: August 26, 2010
Creator: Smith, Jeffrey Claiborne; Keller, Lewis; Lundgren, Steven; Markiewicz, Thomas & Young, Andrew
Object Type: Article
System: The UNT Digital Library