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Start-to-End Simulations of the LCLS Accelerator and FEL Performance at Very Low Charge
The Linac Coherent Light Source (LCLS) is an x-ray Free-electron Laser (FEL) being commissioned at Stanford Linear Accelerator Center (SLAC). Recent beam measurements have shown that, using the LCLS injector-linac-compressors, the beam emittance is very small at 20 pC. In this paper we perform start-to-end simulations of the entire accelerator including the FEL undulator and study the FEL performance versus the bunch charge. At 20 pC charge, these calculations associated with the measured beam parameters suggest the possibility of generating a longitudinally coherent single x-ray spike with 2-femtosecond (fs) duration at a wavelength of 1.5 nm. At 100 pC charge level, our simulations show an x-ray pulse with 10 femtosecond duration and up to 10{sup 12} photons at a wavelength of 1.5 {angstrom}. These results open exciting possibilities for ultrafast science and single shot molecular imaging.
Date:
May 26, 2009
Creator:
Ding, Y; Brachmann, A.; Decker, F. J.; Dowell, D.; Emma, P.; Frisch, J. et al.
Object Type:
Article
System:
The UNT Digital Library
An Assessment of the Commercial Availability of Carbon Dioxide Capture and Storage Technologies as of June 2009
Currently, there is considerable confusion within parts of the carbon dioxide capture and storage (CCS) technical and regulatory communities regarding the maturity and commercial readiness of the technologies needed to capture, transport, inject, monitor and verify the efficacy of carbon dioxide (CO2) storage in deep, geologic formations. The purpose of this technical report is to address this confusion by discussing the state of CCS technological readiness in terms of existing commercial deployments of CO2 capture systems, CO2 transportation pipelines, CO2 injection systems and measurement, monitoring and verification (MMV) systems for CO2 injected into deep geologic structures. To date, CO2 has been captured from both natural gas and coal fired commercial power generating facilities, gasification facilities and other industrial processes. Transportation via pipelines and injection of CO2 into the deep subsurface are well established commercial practices with more than 35 years of industrial experience. There are also a wide variety of MMV technologies that have been employed to understand the fate of CO2 injected into the deep subsurface. The four existing end-to-end commercial CCS projects – Sleipner, Snøhvit, In Salah and Weyburn – are using a broad range of these technologies, and prove that, at a high level, geologic CO2 storage …
Date:
June 26, 2009
Creator:
Dooley, James J.; Davidson, Casie L. & Dahowski, Robert T.
Object Type:
Report
System:
The UNT Digital Library
Libby Mitigation Program, 2007 Annual Progress Report: Mitigation for the Construction and Operation of Libby Dam.
Libby Reservoir was created under an International Columbia River Treaty between the United States and Canada for cooperative water development of the Columbia River Basin (Columbia River Treaty 1964). Libby Reservoir inundated 109 stream miles of the mainstem Kootenai River in the United States and Canada, and 40 miles of tributary streams in the U.S. that provided habitat for spawning, juvenile rearing, and migratory passage (Figure 1). The authorized purpose of the dam is to provide power (91.5%), flood control (8.3%), and navigation and other benefits (0.2%; Storm et al. 1982). The Pacific Northwest Power Act of 1980 recognized possible conflicts stemming from hydroelectric projects in the northwest and directed Bonneville Power Administration to 'protect, mitigate, and enhance fish and wildlife to the extent affected by the development and operation of any hydroelectric project of the Columbia River and its tributaries' (4(h)(10)(A)). Under the Act, the Northwest Power Planning Council was created and recommendations for a comprehensive fish and wildlife program were solicited from the region's federal, state, and tribal fish and wildlife agencies. Among Montana's recommendations was the proposal that research be initiated to quantify acceptable seasonal minimum pool elevations to maintain or enhance the existing fisheries (Graham et …
Date:
May 26, 2009
Creator:
Dunnigan, James; DeShazer, J. & Garrow, L.
Object Type:
Report
System:
The UNT Digital Library
Lexington Observer (Lexington, Okla.), Vol. 13, No. 47, Ed. 1 Thursday, February 26, 2009
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 26, 2009
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Lexington Observer (Lexington, Okla.), Vol. 13, No. 51, Ed. 1 Thursday, March 26, 2009
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 26, 2009
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wylie News (Wylie, Tex.), Vol. 62, No. 15, Ed. 1 Wednesday, August 26, 2009
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
August 26, 2009
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
Citizen Engagement in Post-Hurricane Katrina Planning in Harrison County, Mississippi
This article describes the experiences of Ohio State University’s Knowlton School of Architecture in facilitating a citizen-engagement process for communitywide planning on the Mississippi Gulf Coast.
Date:
February 26, 2009
Creator:
Evans-Cowley, Jennifer & Zimmerman Gough, Meghan
Object Type:
Article
System:
The UNT Digital Library
Identity Theft: Trends and Issues
This report first provides a brief federal legislative history of identity theft laws. It analyzes the current trends in identity theft, including prevalent identity theft-related crimes, the federal agencies involved in combating identity theft, and the trends in identity theft complaints and prosecutions.
Date:
August 26, 2009
Creator:
Finklea, Kristin M.
Object Type:
Report
System:
The UNT Digital Library
Annual Site Environmental Report for Calendar Year 2004
This report provides the U.S. Department of Energy (DOE) and the public with information on the level of radioactive and non-radioactive pollutants (if any) that are added to the environment as a result of Princeton Plasma Physics Laboratory's (PPPL) operations. The results of the 2004 environmental surveillance and monitoring program for PPPL's are presented and discussed. The report also summarizes environmental initiatives, assessments, and programs that were undertaken in 2004.
Date:
March 26, 2009
Creator:
Finley, V.
Object Type:
Report
System:
The UNT Digital Library
Senior Recital: 2009-04-26 - Casey B. Finnigan, tenor
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Concert Hall.
Date:
April 26, 2009
Creator:
Finnigan, Casey B.
Object Type:
Sound
System:
The UNT Digital Library
The Case for the Younger Dryas Extraterrestrial Impact Event: Mammoth, Megafauna and Clovis Extinction
The onset of>1000 years of Younger Dryas cooling, broad-scale extinctions, and the disappearance of the Clovis culture in North America simultaneously occurred 12,900 years ago followed immediately by the appearance of a carbon-rich black layer at many locations. In situ bones of extinct megafauna and Clovis tools occur only beneath this black layer and not within or above it. At the base of the black mat at 9 Clovis-age sites in North America and a site in Belgium numerous extraterrestrial impact markers were found including magnetic grains highly enriched in iridium, magnetic microspherules, vesicular carbon spherules enriched in cubic, hexagonal, and n-type nanodiamonds, glass-like carbon containing Fullerenes and nanodiamonds, charcoal, soot, and polycyclic aromatic hydrocarbons. The same impact markers were found mixed throughout the sediments of 15 Carolina Bays, elliptical depressions along the Atlantic coast, whose parallel major axes point towards either the Great Lakes or Hudson Bay. The magnetic grains and spherules have an unusual Fe/Ti composition similar to lunar Procellarum KREEP Terrane and the organic constituents are enriched in 14C leading to radiocarbon dates often well into the future. These characteristics are inconsistent with known meteorites and suggest that the impact was by a previous unobserved, possibly extrasolar …
Date:
October 26, 2009
Creator:
Firestone, Richard B.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Andrew Firm, February 26, 2009
The National Museum of the Pacific War presents an oral interview with Andrew Firm. Firm joined the Navy in June 1942 and only received 28 days of training before boarding the light cruiser USS Montpelier (CL-57). As a gunner’s mate, his first duty was greasing the guns while the Montpelier patrolled The Slot around Guadalcanal. During island bombardments, he added special tips to shells that would clear trees from the beachheads. In the blazing heat of the Marianas, he was stunned to see a warmly dressed Japanese corpse float by. Returning home in September 1944, Firm transferred to the USS Gilbert Islands (CVE-107), where he maintained a quad-40mm and a 5-inch gun. At the end of the war, he sailed to Okinawa and Tokyo Bay, ultimately leaving the service with six battle stars and a Good Conduct Medal.
Date:
February 26, 2009
Creator:
Firm, Andrew
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Andrew Firm, February 26, 2009
The National Museum of the Pacific War presents an oral interview with Andrew Firm. Firm joined the Navy in June 1942 and only received 28 days of training before boarding the light cruiser USS Montpelier (CL-57). As a gunner’s mate, his first duty was greasing the guns while the Montpelier patrolled The Slot around Guadalcanal. During island bombardments, he added special tips to shells that would clear trees from the beachheads. In the blazing heat of the Marianas, he was stunned to see a warmly dressed Japanese corpse float by. Returning home in September 1944, Firm transferred to the USS Gilbert Islands (CVE-107), where he maintained a quad-40mm and a 5-inch gun. At the end of the war, he sailed to Okinawa and Tokyo Bay, ultimately leaving the service with six battle stars and a Good Conduct Medal.
Date:
February 26, 2009
Creator:
Firm, Andrew
Object Type:
Text
System:
The Portal to Texas History
Surface Transportation Reauthorization Legislation in the 111th Congress: Summary of Selected Major Provisions
None
Date:
August 26, 2009
Creator:
Fischer, John W.; Kirk, Robert S.; Mallett, William J.; Peterman, David Randall; Frittelli, John; Luther, Linda et al.
Object Type:
Report
System:
The UNT Digital Library
The Sachse News (Sachse, Tex.), Vol. 5, No. 5, Ed. 1 Thursday, February 26, 2009
Weekly newspaper from Sachse, Texas that includes local, state and national news along with advertising.
Date:
February 26, 2009
Creator:
Fisher, Donnita Nesbit
Object Type:
Newspaper
System:
The Portal to Texas History
The Sachse News (Sachse, Tex.), Vol. 5, No. 9, Ed. 1 Thursday, March 26, 2009
Weekly newspaper from Sachse, Texas that includes local, state and national news along with advertising.
Date:
March 26, 2009
Creator:
Fisher, Donnita Nesbit
Object Type:
Newspaper
System:
The Portal to Texas History
The Sachse News (Sachse, Tex.), Vol. 5, No. 44, Ed. 1 Thursday, November 26, 2009
Weekly newspaper from Sachse, Texas that includes local, state and national news along with advertising.
Date:
November 26, 2009
Creator:
Fisher, Donnita Nesbit
Object Type:
Newspaper
System:
The Portal to Texas History
Optical People Counting for Demand Controlled Ventilation: A Pilot Study of Counter Performance
This pilot scale study evaluated the counting accuracy of two people counting systems that could be used in demand controlled ventilation systems to provide control signals for modulating outdoor air ventilation rates. The evaluations included controlled challenges of the people counting systems using pre-planned movements of occupants through doorways and evaluations of counting accuracies when naive occupants (i.e., occupants unaware of the counting systems) passed through the entrance doors of the building or room. The two people counting systems had high counting accuracy accuracies, with errors typically less than 10percent, for typical non-demanding counting events. However, counting errors were high in some highly challenging situations, such as multiple people passing simultaneously through a door. Counting errors, for at least one system, can be very high if people stand in the field of view of the sensor. Both counting system have limitations and would need to be used only at appropriate sites and where the demanding situations that led to counting errors were rare.
Date:
December 26, 2009
Creator:
Fisk, William J. & Sullivan, Douglas
Object Type:
Report
System:
The UNT Digital Library
LADTAP-PROB: A PROBABILISTIC MODEL TO ASSESS RADIOLOGICAL CONSEQUENCES FROM LIQUID RADIOACTIVE RELEASES
The potential radiological consequences to humans resulting from aqueous releases at the Savannah River Site (SRS) have usually been assessed using the computer code LADTAP or deterministic variations of this code. The advancement of LADTAP over the years included LADTAP II (a computer program that still resides on the mainframe at SRS) [1], LADTAP XL{copyright} (Microsoft Excel{reg_sign} Spreadsheet) [2], and other versions specific to SRS areas such as [3]. The spreadsheet variations of LADTAP contain two worksheets: LADTAP and IRRIDOSE. The LADTAP worksheet estimates dose for environmental pathways including ingestion of water and fish and external exposure resulting from recreational activities. IRRIDOSE estimates potential dose to individuals from irrigation of food crops with contaminated water. A new version of this deterministic methodology, LADTAP-PROB, was developed at Savannah River National Laboratory (SRNL) to (1) consider the complete range of the model parameter values (not just maximum or mean values), (2) determine the influences of parameter uncertainties within the LADTAP methodology, to perform a sensitivity analysis of all model parameters (to identify the input parameters to which model results are most sensitive), and (3) probabilistically assess radiological consequences from contaminated water. This study presents the methodology applied in LADTAP-PROB.
Date:
January 26, 2009
Creator:
Foley, Trevor Q.; Farfan, Eduardo B. & Jannik, G. Timothy
Object Type:
Article
System:
The UNT Digital Library
FHA-Insured Home Loans: An Overview
This report discusses the feature of the FHA program to insure loans on single-family homes.
Date:
May 26, 2009
Creator:
Foote, Bruce E. & Jones, Katie
Object Type:
Report
System:
The UNT Digital Library
Determining Lamprey Species Composition, Larval Distribution and Adult Abundance in the Deschutes River Subbasin, Oregon ; 2007 Annual Report.
We will report results of an ongoing project in the Deschutes River Subbasin to describe Pacific lamprey (Lampetra tridentata) life history. Project objectives were to determine adult lamprey escapement from Sherars Falls located at Rkm 70.4 and determine lamprey focal spawning areas, spawn timing and habitat through radio telemetry. A mark-recapture study and tribal creel was conducted to determine adult escapement. Lamprey were radio tagged and are currently being mobile, aerial and fixed site tracked to describe spawning. Adult lamprey were collected at Sherars Falls using a long-handled dip net from June-September 2007. The fate of lamprey collected at Sherars Falls was determined based on girth measurements. Fish measuring less than 10.5 cm received two markings for the mark-recapture estimation while those measuring 10.5 cm or greater were implanted with radio transmitters. Two-hundred and nine lamprey were marked during first event sampling, 2,501 lamprey inspected for marks and 64 recaptured during second event sampling. We estimate lamprey abundance to be 8,083 (6,352-10,279) with a relative precision of 19.8. Tribal harvest was 2,303 +/- 88. Escapement was estimated at 5,780 adult lamprey. Thirty-six lamprey received radio transmitters. Lamprey were transported upstream 6.3 Rkm for surgery, held to recover from anesthesia and …
Date:
June 26, 2009
Creator:
Fox, Matt & Graham, Jennifer C.
Object Type:
Report
System:
The UNT Digital Library
Recent Improvements in Fast Wave Heating in NSTX
Recent improvements in high-harmonic fast wave (HHFW) core heating in NSTX are attributed to using lithium conditioning, and other wall conditioning techniques, to move the onset density for perpendicular fast wave propagation further from the antenna. This has resulted in the first observation of HHFW core electron heating in deuterium plasma at a launched toroidal wavenumber, kφ = -3 m-1, NSTX record core electron temperatures of 5 keV in helium and deuterium discharges and, for the first time, significant HHFW core electron heating of deuterium neutral-beam-fuelled H-mode plasmas. Also, kφ = -8 m-1 heating of the plasma startup and plasma current ramp-up has resulted in significant core electron heating, even at central electron densities as low as ~ 4x1018 m-3.
Date:
June 26, 2009
Creator:
G. Taylor, R.E. Bell, R.W. Harvey, J.C. Hosea, E.F. Jaeger, B.P. LeBlanc, C.K. Phillips, P.M. Ryan, E.J. Valeo, J.B. Wilgen, J.R. Wilson, and the NSTX Team
Object Type:
Article
System:
The UNT Digital Library
Interrogation of Detainees: Requirements of the Detainee Treatment Act
This report discusses provisions of the Detainee Treatment Act concerning standards for the interrogation and treatment of detainees.
Date:
August 26, 2009
Creator:
Garcia, Michael J.
Object Type:
Report
System:
The UNT Digital Library
U.N. Convention Against Torture (CAT): Overview and Application to Interrogation Techniques
This report discusses the United Nations Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) requires signatory parties to take measures to end torture within their territorial jurisdiction and to criminalize all acts of torture.
Date:
January 26, 2009
Creator:
Garcia, Michael J.
Object Type:
Report
System:
The UNT Digital Library