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Absolute Bunch Length Measurements by Incoherent Radiation Fluctuation Analysis
By analyzing the pulse to pulse intensity fluctuations of the radiation emitted by a charge particle in the incoherent part of the spectrum, it is possible to extract information about the spatial distribution of the beam. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory, we have developed and successfully tested a simple scheme based on this principle that allows for the absolute measurement of the rms bunch length. A description of the method and the experimental results are presented.
Date:
December 9, 2009
Creator:
Sannibale, F.; /LBL, Berkeley; Stupakov, G.V.; /SLAC; Zolotorev, M.S.; /LBL, Berkeley et al.
Object Type:
Article
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 4, Ed. 1 Wednesday, December 9, 2009
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 9, 2009
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 316, Ed. 1 Wednesday, December 9, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 9, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Beam Echo Effect for Generation of Short-Wavelength Radiation
The Echo-Enabled Harmonic Generation (EEHG) FEL uses two modulators in combination with two dispersion sections to generate a high-harmonic density modulation starting with a relatively small initial energy modulation of the beam. After presenting the concept of the EEHG, we address several practically important issues, such as the effect of coherent and incoherent synchrotron radiation in the dispersion sections. Using a representative realistic set of beam parameters, we show how the EEHG scheme enhances the FEL performance and allows one to generate a fully (both longitudinally and transversely) coherent radiation. We then discuss application of the echo modulation for generation of attosecond pulses of radiation, and also using echo for generation of terahertz radiation. We present main parameters of a proof-of-principle experiment currently being planned at SLAC for demonstration of the echo modulation mechanism.
Date:
December 9, 2009
Creator:
Stupakov, G.
Object Type:
Article
System:
The UNT Digital Library
BF3 Neutron Detector Tests
Radiation portal monitors used for interdiction of illicit materials at borders include highly sensitive neutron detection systems. The main reason for having neutron detection capability is to detect fission neutrons from plutonium. The currently deployed radiation portal monitors (RPMs) from Ludlum and Science Applications International Corporation (SAIC) use neutron detectors based upon 3He-filled gas proportional counters, which are the most common large neutron detector. There is a declining supply of 3He in the world; thus, methods to reduce the use of this gas in RPMs with minimal changes to the current system designs and detection capabilities are being investigated. Reported here are the results of tests of the efficiency of BF3 tubes at a pressure of 800 torr. These measurements were made partially to validate models of the RPM system that have been modified to simulate the performance of BF3-filled tubes. While BF3 could be a potential replacement for 3He, there are limitations to its use in deployed systems.
Date:
December 9, 2009
Creator:
Kouzes, Richard T.; Ely, James H.; Lintereur, Azaree T.; Siciliano, Edward R. & Woodring, Mitchell L.
Object Type:
Report
System:
The UNT Digital Library
Brady Standard-Herald and Heart of Texas News (Brady, Tex.), Ed. 1 Wednesday, December 9, 2009
Weekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
December 9, 2009
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Calculation of Coherent Synchrotron Radiation Impedance Using the Mode Expansion Method
We study an impedance due to coherent synchrotron radiation (CSR) generated by a short bunch of charged particles passing through a dipole magnet of finite length in a vacuum chamber of a given cross section. In our method we decompose the electromagnetic field of the beam over the eigenmodes of the toroidal chamber and derive a system of equations for the expansion coefficients in the series. The general method is further specialized for a toroidal vacuum chamber of a rectangular cross section where the eigenmodes can be computed analytically. We also develop a computer code that calculates the CSR impedance for a toroid of rectangular cross section. Numerical results obtained with the code are presented in the paper.
Date:
December 9, 2009
Creator:
Stupakov, G. V. & Kotelnikov, I. A.
Object Type:
Article
System:
The UNT Digital Library
Cars and Climate: What Can EPA Do to Control Greenhouse Gases from Mobile Sources?
This report discusses the debate surrounding proposed controls on greenhouse gas emissions. Not all parties are in agreement that controls on GHGs are desirable.
Date:
December 9, 2009
Creator:
McCarthy, James E.
Object Type:
Report
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 160, No. 42, Ed. 1 Wednesday, December 9, 2009
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 9, 2009
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 49, Ed. 1 Wednesday, December 9, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 9, 2009
Creator:
Henry, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
Design Considerations for a PEBB-Based Marx-Topology ILC Klystron Modulator
The concept of Power Electronic Building Blocks (PEBBs) has its origin in the U.S. Navy during the last decade of the past century. As compared to a more conventional or classical design approach, a PEBB-oriented design approach combines various potential advantages such as increased modularity, high availability and simplified serviceability. This relatively new design paradigm for power conversion has progressively matured since then and its underlying philosophy has been clearly and successfully demonstrated in a number of real-world applications. Therefore, this approach has been adopted here to design a Marx-topology modulator for an International Linear Collider (ILC) environment where easy serviceability and high availability are crucial. This paper describes various aspects relating to the design of a 32-cell Marx-topology ILC klystron modulator. The concept of nested droop correction is introduced and illustrated. Several design considerations including cosmic ray withstand, power cycling capability, fault tolerance, etc., are discussed. Details of the design of a Marx cell PEBB are included.
Date:
December 9, 2009
Creator:
Macken, K.; Beukers, T.; Burkhart, C.; Kemp, M. A.; Nguyen, M. N. & Tang, T.
Object Type:
Article
System:
The UNT Digital Library
Earmarks Disclosed by Congress: FY2008 and FY2009 Regular Appropriations Bills
This report provides information on the earmarks disclosed by the House and Senate for the 12 regular, annual appropriations bills for each of FY2008 and FY2009. The report directly analyzes the data in the earmark disclosure lists, without additions or deletions.
Date:
December 9, 2009
Creator:
Hardy Vincent, Carol & Monke, Jim
Object Type:
Report
System:
The UNT Digital Library
Economic Stimulus: Issues and Policy
This report discusses the passing of the American Recovery and Reinvestment Act of 2009, which included tax cut and spending provisions totaling at a cost of $787 billion in an attempt to mitigate the economic fallout of the housing and financial crises on the general economy. The report examines issues surrounding fiscal stimulus such as timeliness, the magnitude of stimulus, long-term effects and previously adopted policies.
Date:
December 9, 2009
Creator:
Gravelle, Jane G.; Hungerford, Thomas L. & Labonte, Marc
Object Type:
Report
System:
The UNT Digital Library
[Envelope Addressed to Texas Stonewall Democratic Caucus]
Photocopy of an envelope addressed to Texas Stonewall Democratic Caucus from Stonewall Democrats of the Rio Grande Valley, postmarked on December 9, 2009.
Date:
December 9, 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, December 9, 2009
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 9, 2009
Creator:
Pittman, Jerry & Wray, Kelly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
FEL and Optical Klystron Gain for an Electron Beam with Oscillatory Energy Distribution
If the energy spread of a beam is larger then the Pierce parameter, the FEL gain length increases dramatically and the FEL output gets suppressed. We show that if the energy distribution of such a beam is made oscillatory on a small scale, the gain length can be considerably decreased. Such an oscillatory energy distribution is generated by first modulating the beam energy with a laser via the mechanism of inverse FEL, and then sending it through a strong chicane. We show that this approach also works for the optical klystron enhancement scheme. Our analytical results are corroborated by numerical simulations.
Date:
December 9, 2009
Creator:
Stupakov, G.; Ding, Y. & Huang, Z.
Object Type:
Article
System:
The UNT Digital Library
Financial Audit: Office of Financial Stability (Troubled Asset Relief Program) Fiscal Year 2009 Financial Statements
A letter report issued by the Government Accountability Office with an abstract that begins "On October 3, 2008, the Emergency Economic Stabilization Act of 2008 (EESA) was signed into law. EESA authorized the Secretary of the Treasury to implement the Troubled Asset Relief Program (TARP) and established the Office of Financial Stability (OFS) within the Department of the Treasury (Treasury) to do so. EESA requires the annual preparation of financial statements for TARP, and further requires GAO to audit these statements. GAO audited OFS's fiscal year 2009 financial statements for TARP to determine whether, in all material respects, (1) the financial statements were fairly stated, and (2) OFS management maintained effective internal control over financial reporting. GAO also tested OFS's compliance with selected provisions of laws and regulations. We will be separately reporting to OFS on additional details concerning the findings in this report along with recommendations for corrective actions. In commenting on a draft of this report, the Assistant Secretary, Office of Financial Stability, stated OFS concurred with the two significant deficiencies in its internal control over financial reporting GAO identified. He also stated that OFS is committed to correcting the deficiencies."
Date:
December 9, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
The G-20 and International Economic Cooperation: Background and Implications for Congress
This report discusses the background of the G-20 (an international forum for discussing and coordinating economic policies) and some of the issues that it has addressed. It includes historic background on the work of the G-20, information about how the group operates, overviews of G-20 summits, major issues that the group is likely to address and the likely effectiveness of the G-20 in the near future.
Date:
December 9, 2009
Creator:
Nelson, Rebecca M.
Object Type:
Report
System:
The UNT Digital Library
Gas Hydrates Research Programs: An International Review
Gas hydrates sediments have the potential of providing a huge amount of natural gas for human use. Hydrate sediments have been found in many different regions where the required temperature and pressure conditions have been satisfied. Resource exploitation is related to the safe dissociation of the gas hydrate sediments. Basic depressurization techniques and thermal stimulation processes have been tried in pilot efforts to exploit the resource. There is a growing interest in gas hydrates all over the world due to the inevitable decline of oil and gas reserves. Many different countries are interested in this valuable resource. Unsurprisingly, developed countries with limited energy resources have taken the lead in worldwide gas hydrates research and exploration. The goal of this research project is to collect information in order to record and evaluate the relative strengths and goals of the different gas hydrates programs throughout the world. A thorough literature search about gas hydrates research activities has been conducted. The main participants in the research effort have been identified and summaries of their past and present activities reported. An evaluation section discussing present and future research activities has also been included.
Date:
December 9, 2009
Creator:
Gabitto, Jorge & Barrufet, Maria
Object Type:
Report
System:
The UNT Digital Library
Government Collection of Private Information: Background and Issues Related to the USA PATRIOT Act Reauthorization
This report discusses the history of constitutional interpretations and legislative responses relevant to the collection of private information for criminal investigation, foreign intelligence gathering, and national security purposes.
Date:
December 9, 2009
Creator:
Henning, Anna C.; Bazan, Elizabeth B.; Doyle, Charles & Liu, Edward C.
Object Type:
Report
System:
The UNT Digital Library
The Greensheet (Dallas, Tex.), Vol. 33, No. 246, Ed. 1 Wednesday, December 9, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
December 9, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 40, No. 532, Ed. 1 Wednesday, December 9, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
December 9, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 40, No. 533, Ed. 1 Wednesday, December 9, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
December 9, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 40, No. 534, Ed. 1 Wednesday, December 9, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
December 9, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History