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Edge Turbulence Velocity Changes with Lithium Coating on NSTX
Lithium coating improves energy confinement and eliminates edge localized modes in NSTX, but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging (GPI) diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX. __________________________________________________
Date:
August 10, 2012
Creator:
A. Cao, S.J. Zweben, D.P. Stotler, M. Bell, A. Diallo, S.M. Kaye and B. LeBlanc
Object Type:
Report
System:
The UNT Digital Library
Potential for luminosity improvement for low-energy RHIC operation with long bunches
Electron cooling was proposed to increase luminosity of the RHIC collider for heavy ion beams at low energies. Luminosity decreases as the square of bunch intensity due to the beam loss from the RF bucket as a result of the longitudinal intra beam scattering (IBS), as well as due to the transverse emittance growth because of the transverse IBS. Both transverse and longitudinal IBS can be counteracted with electron cooling. This would allow one to keep the initial peak luminosity close to constant throughout the store essentially without the beam loss. In addition, the phase-space density of the hadron beams can be further increased by providing stronger electron cooling. Unfortunately, the defining limitation for low energies in RHIC is expected to be the space charge. Here we explore an idea of additional improvement in luminosity, on top of the one coming from just IBS compensation and longer stores, which may be expected if one can operate with longer bunches at the space-charge limit in a collider. This approach together with electron cooling may result in about 10-fold improvement in total luminosity for low-energy RHIC program.
Date:
February 10, 2012
Creator:
A., Fedotov; Blaskiewicz, & M.
Object Type:
Report
System:
The UNT Digital Library
Luminosity Determination in pp Collisions at sqrt(s)=7 TeV Using the ATLAS Detector at the LHC
None
Date:
June 10, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
LITERATURE REVIEW ON IMPACT OF GLYCOLATE ON THE 2H EVAPORATOR AND THE EFFLUENT TREATMENT FACILITY
Glycolic acid (GA) is being studied as an alternate reductant in the Defense Waste Processing Facility (DWPF) feed preparation process. It will either be a total or partial replacement for the formic acid that is currently used. A literature review has been conducted on the impact of glycolate on two post-DWPF downstream systems - the 2H Evaporator system and the Effluent Treatment Facility (ETF). The DWPF recycle stream serves as a portion of the feed to the 2H Evaporator. Glycolate enters the evaporator system from the glycolate in the recycle stream. The overhead (i.e., condensed phase) from the 2H Evaporator serves as a portion of the feed to the ETF. The literature search revealed that virtually no impact is anticipated for the 2H Evaporator. Glycolate may help reduce scale formation in the evaporator due to its high complexing ability. The drawback of the solubilizing ability is the potential impact on the criticality analysis of the 2H Evaporator system. It is recommended that at least a theoretical evaluation to confirm the finding that no self-propagating violent reactions with nitrate/nitrites will occur should be performed. Similarly, identification of sources of ignition relevant to glycolate and/or update of the composite flammability analysis to …
Date:
May 10, 2012
Creator:
Adu-Wusu, K.
Object Type:
Report
System:
The UNT Digital Library
The Future of the Eurozone and U.S. Interests
Seventeen of the European Union's 27 member states share an economic and monetary union (EMU) with the euro as a single currency. These countries are effectively referred to as the Eurozone. What has become known as the Eurozone crisis began in early 2010 when financial markets were shaken by heightened concerns that the fiscal positions of a number of Eurozone countries, beginning with Greece, were unsustainable. This report provides background information and analysis on the future of the Eurozone in six parts, including discussions on the origins and design challenges of the Eurozone, proposals to define the Eurozone crisis, possible scenarios for the future of the Eurozone, and the implications of the Eurozone crisis for U.S. economic and political interests.
Date:
January 10, 2011
Creator:
Ahearn, Raymond J.; Jackson, James K.; Nelson, Rebecca M. & Weiss, Martin A.
Object Type:
Report
System:
The UNT Digital Library
Does the Endangered Species Act Listing Provide More Protection of the Polar Bear?
None
Date:
November 10, 2010
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Gray Wolves Under the Endangered Species Act: Distinct Population Segments and Experimental Populations
This report analyzes the DPS designation process as it is applied to the gray wolf. It also examines experimental populations of wolves under the ESA and their protections. As part of its oversight responsibilities, Congress has conducted hearings on the Fish and Wildlife Service’s application of science to endangered species.
Date:
August 10, 2010
Creator:
Alexander, Kristina & Corn, M. L.
Object Type:
Report
System:
The UNT Digital Library
Tetraquark Interpretation of $E^ E^- \to \Upsilon \pi^ \pi^-$ Belle Data and $E^ E^- \to B \bar{b}$ BaBar Data
None
Date:
June 10, 2013
Creator:
Ali, Ahmed
Object Type:
Article
System:
The UNT Digital Library
Measuring Sparticles with the Matrix Element
We apply the Matrix Element Method (MEM) to mass determination of squark pair production with direct decay to quarks and LSP at the LHC, showing that simultaneous mass determination of squarks and LSP is possible. We furthermore propose methods for inclusion of QCD radiation effects in the MEM. The goal of the LHC at CERN, scheduled to start this year, is to discover new physics through deviations from the Standard Model (SM) predictions. After discovery of deviations from the SM, the next step will be classification of the new physics. An important first goal in this process will be establishing a mass spectrum of the new particles. One of the most challenging scenarios is pair-production of new particles which decay to invisible massive particles, giving missing energy signals. Many methods have been proposed for mass determination in such scenarios (for a recent list of references, see e.g. [1]). In this proceeding, we report the first steps in applying the Matrix Element Method (MEM) in the context of supersymmetric scenarios giving missing energy signals. After a quick review of the MEM, we will focus on squark pair production, a process where other mass determination techniques have difficulties to simultaneously determine the …
Date:
April 10, 2012
Creator:
Alwall, Johan; /SLAC /Taiwan, Natl. Taiwan U.; Freitas, Ayres; U., /Pittsburgh; Mattelaer, Olivier & /INFN, Rome3 /Rome III U. /Louvain U.
Object Type:
Article
System:
The UNT Digital Library
QCD Radiation in the Production of Heavy Colored Particles at the LHC
None
Date:
July 10, 2013
Creator:
Alwall, Johan; de Visscher, Simon & Maltoni, Fabio
Object Type:
Article
System:
The UNT Digital Library
Stauts of the Laser Inertial Fusion Energy (LIFE) Hohlraum Point Design
Progress on the hohlraum point design for the LIFE engine is described. New features in the original design [Amendt et al., Fus. Sci. Technol. 60, 49 (2011)] are incorporated that address the imperatives of low target cost, high manufacturing throughput, efficient and prompt material recycling, an ability for near-term testing of key target design uncertainties on the National Ignition Facility, and robustness to target chamber environment and injection insults. To this end, the novel use of Pb hohlraums and aerogel-supported liquid DT fuel loading within a high-density-carbon (HDC) ablator is implemented in the hohlraum point design.
Date:
April 10, 2012
Creator:
Amendt, P.; Dunne, M.; Ho, D.; Lasinski, B.; Meeker, D. & Ross, J. S.
Object Type:
Article
System:
The UNT Digital Library
The SM and NLO Multileg Working Group: Summary Report
After years of waiting, and after six Les Houches workshops, the era of LHC running is finally upon us, albeit at a lower initial center-of-mass energy than originally planned. Thus, there has been a great sense of anticipation from both the experimental and theoretical communities. The last two years, in particular, have seen great productivity in the area of multi-parton calculations at leading order (LO), next-to-leading order (NLO) and next-to-next-to-leading order (NNLO), and this productivity is reflected in the proceedings of the NLM group. Both religions, Feynmanians and Unitarians, as well as agnostic experimenters, were well-represented in both the discussions at Les Houches, and in the contributions to the write-up. Next-to-leading order (NLO) is the first order at which the normalization, and in some cases the shape, of perturbative cross sections can be considered reliable. This can be especially true when probing extreme kinematic regions, as for example with boosted Higgs searches considered in several of the contributions to this writeup. A full understanding for both standard model and beyond the standard model physics at the LHC requires the development of fast, reliable programs for the calculation of multi-parton final states at NLO. There have been many advances in the …
Date:
April 10, 2012
Creator:
Andersen, J. R.; Archibald, J.; Badger, S.; Ball, R. D.; Bevilacqua, G.; Bierenbaum, I. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for Solar Axion Emission from 7Li and D(p,gamma)3He Nuclear Decays with the CAST gamma-ray Calorimeter
None
Date:
July 10, 2013
Creator:
Andriamonje, S.; Aune, S.; Autiero, D.; Barth, K.; Belov, A.; Beltran, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Muon Fluence Measurements for Homeland Security Applications
This report focuses on work conducted at Pacific Northwest National Laboratory to better characterize aspects of backgrounds in RPMs deployed for homeland security purposes. Two polyvinyl toluene scintillators were utilized with supporting NIM electronics to measure the muon coincidence rate. Muon spallation is one mechanism by which background neutrons are produced. The measurements performed concentrated on a broad investigation of the dependence of the muon flux on a) variations in solid angle subtended by the detector; b) the detector inclination with the horizontal; c) depth underground; and d) diurnal effects. These tests were conducted inside at Building 318/133, outdoors at Building 331G, and underground at Building 3425 at Pacific Northwest National Laboratory.
Date:
August 10, 2010
Creator:
Ankney, Austin S.; Berguson, Timothy J.; Borgardt, James D. & Kouzes, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Northern Ireland: The Peace Process
This report provides background information regarding political violence and the peace process in Northern Ireland. It includes further information about the devolved government and recurrent crises (1999-2002, 2003-2007 and 2008-2010), implementation of police reforms, recent events and ongoing challenges, relevant U.S. policy, and recent legislation.
Date:
January 10, 2014
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
U.S.-Nordic Relations
This report briefly discusses U.S. relations with the Nordic countries--Denmark, Finland, Iceland, Norway, and Sweden.
Date:
May 10, 2016
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Algeria: Current Issues
This report examines the current state of Algeria, including Algeria's associations with terrorism, the weakening of the Algerian military, and the nation's growing oil revenues.
Date:
February 10, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Political Transition in Tunisia
This report discusses Tunisia's pro-democracy movement; concerns over potential instability in a previously secure, pro-Western area; and U.S.-Tunisian relations.
Date:
February 10, 2015
Creator:
Arieff, Alexis & Humud, Carla E.
Object Type:
Report
System:
The UNT Digital Library
Reauthorization of SNAP and Other Nutrition Programs in the Next Farm Bill: Issues for the 113th Congress
This report discusses the Nutrition Title (Title IV) of the pending farm bills and elaborates on the most controversial issues and differences between Senate and House proposals. Policies that are not necessarily controversial but are complex are also included in this report.
Date:
December 10, 2013
Creator:
Aussenberg, Randy Alison
Object Type:
Report
System:
The UNT Digital Library
2012 Farm Bill: Changing the Treatment of LIHEAP Receipt in the Calculation of SNAP Benefits
This report describes the contents of the 2012 Farm Bill, cost reducing measures in the Farm Bill, and the implications of both of these. Specifically, the report focuses on SNAP (Supplemental Nutrition Assistance Program) which is a cost saving measure that addresses how certain deductions from income will be calculated.
Date:
July 10, 2012
Creator:
Aussenberg, Randy Alison & Perl, Libby
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report gives an overview of the federal debt limit, its history, and recent increases
Date:
May 10, 2011
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Running Deficits: Positives and Pitfalls
This report discusses how deficit finance can help governments manage their economies and how large and persistent deficits can lead to severe economic problems.
Date:
March 10, 2010
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report gives an historical overview of debt limits, discusses how the total debt of the federal government can increase and how the current economic slowdown has led to higher deficits and thereby a series of debt limit increases, as well as legislation related to these increases.
Date:
January 10, 2013
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Trends in Discretionary Spending
Discretionary spending is provided in, and controlled by, annual appropriations acts, which fund many of the routine activities commonly associated with such federal government functions as running executive branch agencies, congressional offices and agencies, and international operations of the government. Essentially all spending on federal wages and salaries is discretionary. This report discusses historical, current, and projected discretionary spending trends. It also describes how current discretionary spending trends reflect national priorities.
Date:
September 10, 2010
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library