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2D Optical Streaking for Ultra-Short Electron Beam Diagnostics
We propose a novel approach to measure short electron bunch profiles at micrometer level. Low energy electrons generated during beam-gas ionization are simultaneously modulated by the transverse electric field of a circularly-polarized laser, and then they are collected at a downstream screen where the angular modulation is converted to a circular shape. The longitudinal bunch profile is simply represented by the angular distribution of the electrons on the screen. We only need to know the laser wavelength for calibration and there is no phase synchronization problem. Meanwhile the required laser power is also relatively low in this setup. Some simulations examples and experimental consideration of this method are discussed. At Linac Coherent Light Source (LCLS), an S-band RF transverse deflector (TCAV) is used to measure the bunch length with a resolution 10 femtosecond (fs) rms. An X-band deflector (wavelength 2.6cm) is proposed recently to improve the resolution. However, at the low charge operation mode (20pC), the pulse length can be as short as fs. It is very challenging to measure femtosecond and sub-femtosecond level bunch length. One of the methods is switching from RF to {mu}m level wavelength laser to deflect the bunch. A powerful laser ({approx}10s GW) is required …
Date:
December 14, 2011
Creator:
Ding, Y.T.; Huang, Z. & Wang, L.
Object Type:
Article
System:
The UNT Digital Library
Aerosol Absorption and Scattering Measurements: Field Measuremnets and Laboratory Characterizations.
The objective of this report is to determine the overall impact of atmospheric aerosols on radioactive balance.
Date:
December 14, 2011
Creator:
Marley, Nancy A. & Gaffney, Jeffrey S.
Object Type:
Report
System:
The UNT Digital Library
Agriculture and Related Agencies: FY2012 Appropriations
This report considers the Agriculture and Related Agencies appropriations bill. The report compares and contrasts the Senate and House versions of the bill in terms of budgeting.
Date:
December 14, 2011
Creator:
Monke, Jim
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 177, Ed. 1 Wednesday, December 14, 2011
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 2011
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 245, Ed. 1 Wednesday, December 14, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 162, No. 42, Ed. 1 Wednesday, December 14, 2011
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 14, 2011
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Criticality Safety Analysis on the Mixed Be, Nat-U, and C (Graphite) Reflectors in 55-Gallon Waste Drums and Their Equivalents for HWM Applications
The objective of this analysis is to develop and establish the technical basis on the criticality safety controls for the storage of mixed beryllium (Be), natural uranium (Nat-U), and carbon (C)/graphite reflectors in 55-gallon waste containers and/or their equivalents in Hazardous Waste Management (HWM) facilities. Based on the criticality safety limits and controls outlined in Section 3.0, the operations involving the use of mixed-reflector drums satisfy the double-contingency principle as required by DOE Order 420.1 and are therefore criticality safe. The mixed-reflector mass limit is 120 grams for each 55-gallon drum or its equivalent. a reflector waiver of 50 grams is allowed for Be, Nat-U, or C/graphite combined. The waived reflectors may be excluded from the reflector mass calculations when determining if a drum is compliant. The mixed-reflector drums are allowed to mix with the typical 55-gallon one-reflector drums with a Pu mass limit of 120 grams. The fissile mass limit for the mixed-reflector container is 65 grams of Pu equivalent each. The corresponding reflector mass limits are 300 grams of Be, and/or 100 kilograms of Nat-U, and/or 110 kilograms of C/graphite for each container. All other unaffected control parameters for the one-reflector containers remain in effect for the mixed-reflector …
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
Criticality Safety Controls for 55-Gallon Drums with a Mass Limit of 200 grams Pu-239
The following 200-gram Pu drum criticality safety controls are applicable to RHWM drum storage operations: (1) Mass (Fissile/Pu) - each 55-gallon drum or its equivalent shall be limited to 200 gram Pu or Pu equivalent; (2) Moderation - Hydrogen materials with a hydrogen density greater than that (0.133 g H/cc) of polyethylene and paraffin are not allowed and hydrogen materials with a hydrogen density no greater than that of polyethylene and paraffin are allowed with unlimited amounts; (3) Interaction - a spacing of 30-inches (76 cm) is required between arrays and 200-gram Pu drums shall be placed in arrays for 200-gram Pu drums only (no mingling of 200-gram Pu drums with other drums not meeting the drum controls associated with the 200-gram limit); (4) Reflection - no beryllium and carbon/graphite (other than the 50-gram waiver amount) is allowed, (note that Nat-U exceeding the waiver amount is allowed when its U-235 content is included in the fissile mass limit of 200 grams); and (5) Geometry - drum geometry, only 55-gallon drum or its equivalent shall be used and array geometry, 55-gallon drums are allowed for 2-high stacking. Steel waste boxes may be stacked 3-high if constraint.
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
Criticality Safety Evaluations on the Use of 200-gram Pu Mass Limit for RHWM Waste Storage Operations
This work establishes the criticality safety technical basis to increase the fissile mass limit from 120 grams to 200 grams for Type A 55-gallon drums and their equivalents. Current RHWM fissile mass limit is 120 grams Pu for Type A 55-gallon containers and their equivalent. In order to increase the Type A 55-gallon drum limit to 200 grams, a few additional criticality safety control requirements are needed on moderators, reflectors, and array controls to ensure that the 200-gram Pu drums remain criticality safe with inadvertent criticality remains incredible. The purpose of this work is to analyze the use of 200-gram Pu drum mass limit for waste storage operations in Radioactive and Hazardous Waste Management (RHWM) Facilities. In this evaluation, the criticality safety controls associated with the 200-gram Pu drums are established for the RHWM waste storage operations. With the implementation of these criticality safety controls, the 200-gram Pu waste drum storage operations are demonstrated to be criticality safe and meet the double-contingency-principle requirement per DOE O 420.1.
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 117, No. 50, Ed. 1 Wednesday, December 14, 2011
Weekly newspaper from Cuero, Texas that includes local, state and national news along with advertising.
Date:
December 14, 2011
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, December 14, 2011
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 2011
Creator:
DeSilver, Debi
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Final Report for research grant "Development of Methods for High Specific Activity Labeling of Biomolecules Using Astatine-211 in Different Oxidation States"
The overall objective of this research effort was to develop methods for labeling biomolecules with higher oxidation state species of At-211. This was to be done in an effort to develop reagents that had higher in vivo stability than the present carbon-bonded At-211-labeled compounds. We were unsuccessful in that effort, as none of the approaches studied provided reagents that were stable to in vivo deastatination. However, we gained a lot of information about At-211 in higher oxidation states. The studies proved to be very difficult as small changes in pH and other conditions appeared to change the nature of the species that obtained (by HPLC retention time analyses), with many of the species being unidentifiable. The fact that there are no stable isotopes of astatine, and the chemistry of the nearest halogen iodine is quite different, made it very difficult to interpret results of some experiments. With that said, we believe that a lot of valuable information was obtained from the studies. The research effort evaluated: (1) methods for chemical oxidation of At-211, (2) approaches to chelation of oxidized At-211, and (3) approaches to oxidation of astatophenyl compounds. A major hurdle that had to be surmounted to conduct the research …
Date:
December 14, 2011
Creator:
Wilbur, D., Scott
Object Type:
Report
System:
The UNT Digital Library
Foster Children: HHS Guidance Could Help States Improve Oversight of Psychotropic Prescriptions [Reissued on December 15, 2011]
A letter report issued by the Government Accountability Office with an abstract that begins "What GAO Found"
Date:
December 14, 2011
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
The Greensheet (Dallas, Tex.), Vol. 35, No. 253, Ed. 1 Wednesday, December 14, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
December 14, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 544, Ed. 1 Wednesday, December 14, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
December 14, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 546, Ed. 1 Wednesday, December 14, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
December 14, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Identity Theft: Trends and Issues
This report first provides a brief federal legislative history of identity theft laws.
Date:
December 14, 2011
Creator:
Finklea, Kristin M.
Object Type:
Report
System:
The UNT Digital Library
Intraocular Pressure Changes: An Important Determinant of the Biocompatibility of Intravitreous Implants
Article discussing intraocular pressure changes and an important determinant of the biocompatibility of intravitreous implants.
Date:
December 14, 2011
Creator:
Zou, Ling; Nair, Ashwin; Weng, Hong; Tsai, Yi-Ting; Hu, Zhibing & Tang, Liping
Object Type:
Article
System:
The UNT Digital Library
Jackson County Herald-Tribune (Edna, Tex.), Vol. 105, No. 4, Ed. 1 Wednesday, December 14, 2011
Weekly newspaper from Edna, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 2011
Creator:
Lundstrom, Chris
Object Type:
Newspaper
System:
The Portal to Texas History
Mannford Eagle (Mannford, Okla.), Vol. 54, No. 27, Ed. 1 Wednesday, December 14, 2011
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 14, 2011
Creator:
Hughes, Dustin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
National Infrastructure Bank: Overview and Current Legislation
Several bills to establish a national infrastructure bank have been introduced in the 112th Congress. This report examines three such bills, the Building and Upgrading Infrastructure for Long-Term Development Act (S. 652), the American Infrastructure Investment Fund Act of 2011 (S. 936), and the National Infrastructure Development Bank Act of 2011 (H.R. 402).
Date:
December 14, 2011
Creator:
Mallett, William J.; Maguire, Steven & Kosar, Kevin R.
Object Type:
Report
System:
The UNT Digital Library
The National Telecommunications and Information Administration (NTIA): Policies, Programs, and Funding
The National Telecommunications and Information Administration (NTIA), an agency of the Department of Commerce, is the executive branch's principal advisory office on domestic and international telecommunications and information policies. Its mandate is to provide greater access for all Americans to telecommunications services, support U.S. attempts to open foreign markets, advise on international telecommunications negotiations, and fund research for new technologies and their applications. NTIA also manages the distribution of funds for several key grant programs.
Date:
December 14, 2011
Creator:
Moore, Linda K.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Nonproliferation: Action Needed to Address NNSA's Program Management and Coordination Challenges
A letter report issued by the Government Accountability Office with an abstract that begins "What GAO Found:"
Date:
December 14, 2011
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Observation of Beam ION Instability in Spear3
Weak vertical coupled bunch instability with oscillation amplitude at {mu}m level has been observed in SPEAR3. The instability becomes stronger when there is a vacuum pressure rise by partially turning off vacuum pumps and it becomes weaker when the vertical beam emittance is increased by turning off the skew quadrupole magnets. These confirmed that the instability was driven by ions in the vacuum. The threshold of the beam ion instability when running with a single bunch train is just under 200 mA. This paper presents the comprehensive observations of the beam ion instability in SPEAR3. The effects of vacuum pressure, beam current, beam filling pattern, chromaticity, beam emittance and bunch-by-bunch feedback are investigated in great detail. In an electron accelerator, ions generated from the residual gas molecules can be trapped by the beam. Then these trapped ions interact resonantly with the beam and cause beam instability and emittance blow-up. Most existing light sources use a long single bunch train filling pattern, followed by a long gap to avoid multi-turn ion trapping. However, such a gap does not preclude ions from accumulating during one passage of the single bunch train beam, and those ions can still cause a Fast Ion Instability …
Date:
December 14, 2011
Creator:
Teytelman, D.; Cai, Y.; Corbett, W. J.; Raubenheimer, T. O.; Safranek, J. A.; Schmerge, J. F. et al.
Object Type:
Article
System:
The UNT Digital Library