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Quantitative Experiments With Electrons in a Positively Charged Beam
Intense ion beams are an extreme example of, and difficult to maintain as, a non-neutral plasma. Experiments and simulations are used to study the complex interactions between beam ions and (unwanted) electrons. Such ''electron clouds'' limit the performance of many accelerators. To characterize electron clouds, a number of parameters are measured including: total and local electron production and loss for each of three major sources, beam potential versus time, electron line-charge density, and gas pressure within the beam. Electron control methods include surface treatments to reduce electron and gas emission, and techniques to remove, or block, electrons from the beam. Detailed, self-consistent simulations include beam-transport fields, and electron and gas generation and consistent transport, to compute unexpectedly rich behavior, much of which is confirmed experimentally. For example, in a quadrupole magnetic field, ion and dense electron plasmas interact to produce multi-kV oscillations in the electron plasma and distortions of the beam velocity space distribution, without becoming homogenous or locally neutral.
Date:
October 27, 2006
Creator:
Molvik, A W; Vay, J; Covo, M K; Cohen, R; Baca, D; Bieniosek, F et al.
Object Type:
Article
System:
The UNT Digital Library
Quantitative experiments with electrons in a positively chargedBeam
None
Date:
October 27, 2006
Creator:
Molvik, A. W.; Vay, J. L.; Kireef Covo, M.; Cohen, R.; Baca, D.; Bieniosek, F. et al.
Object Type:
Article
System:
The UNT Digital Library
The Ranger (San Antonio, Tex.), Vol. 80, No. 7, Ed. 1 Friday, October 27, 2006
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
October 27, 2006
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Rice Thresher, Vol. 94, No. 9, Ed. 1 Friday, October 27, 2006
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
October 27, 2006
Creator:
Brown, David
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 91, No. 352, Ed. 1 Friday, October 27, 2006
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 27, 2006
Creator:
Mattox, Jami
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Scene: North Texas Daily (Denton, Tex.), Vol. 91, No. 35, Ed. 1 Friday, October 27, 2006
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
October 27, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Scrape-Off Layer Transport and Deposition Studies in DIII-D
Trace {sup 13}CH{sub 4} injection experiments into the main scrape-off layer of low density L-mode and high-density H-mode plasmas have been performed in the DIII-D tokamak [Luxon{_}NF02] to mimic the transport and deposition of carbon arising from a main chamber sputtering source. These experiments indicated entrainment of the injected carbon in plasma flow in the main SOL, and transport toward the inner divertor. Ex-situ surface analysis showed enhanced {sup 13}C surface concentration at the corner formed by the divertor floor and the angled target plate of the inner divertor in L-mode; in H-mode, both at the corner and along the surface bounding the private flux region inboard of the outer strike point. Interpretative modeling was made consistent with these experimental results by imposing a parallel carbon ion flow in the main SOL toward the inner target, and a radial pinch toward the separatrix. Predictive modeling carried out to better understand the underlying plasma transport processes suggests that the deuterium flow in the main SOL is related to the degree of detachment of the inner divertor leg. These simulations show that carbon ions are entrained with the deuteron flow in the main SOL via frictional coupling, but higher charge state carbon …
Date:
October 27, 2006
Creator:
Groth, M.; Allen, S.; Boedo, J.; Brooks, N.; Elder, J.; Fenstermacher, M. et al.
Object Type:
Article
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 119, No. 87, Ed. 1 Friday, October 27, 2006
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
October 27, 2006
Creator:
Eddleman, Mike & Dang, Tracy
Object Type:
Newspaper
System:
The Portal to Texas History
Stability Of Plasma Configurations During Compression
Magnetized Target Fusion (MTF) efforts are based on calculations showing that the addition of a closed magnetic field reduces the driver pressure and rise time requirements for inertial confinement fusion by reducing thermal conductivity. Instabilities that result in convective bulk transport at the Alphen time scale are of particular concern since they are much faster than the implosion time. Such instabilities may occur during compression due to, for example, an increase in the plasma-magnetic pressure ratio {beta} or, in the case of a rotating plasma, spin-up due to angular momentum conservation. Details depend on the magnetic field topology and compression geometry. A hard core z pinch with purely azimuthal magnetic field can theoretically be made that relaxes into a wall supported diffuse profile satisfying the Kadomtsev criterion for the stability of m = 0 modes, which is theoretically preserved during cylindrical outer wall compression. The center conductor radius and current must also be large enough to keep the {beta} below stability limits to stabilize modes with m > 0. The stability of m > 0 modes actually improves during compression. A disadvantage of this geometry, though, is plasma contact with the solid boundaries. In addition to the risk of high …
Date:
October 27, 2006
Creator:
Ruden, E L & Hammer, J H
Object Type:
Article
System:
The UNT Digital Library
Sunlight Responsive Thermochromic Window System
Pleotint has embarked on a novel approach with our Sunlight Responsive Thermochromic, SRT™, windows. We are integrating dynamic sunlight control, high insulation values and low solar heat gain together in a high performance window. The Pleotint SRT window is dynamic because it reversibly changes light transmission based on thermochromics activated directly by the heating effect of sunlight. We can achieve a window package with low solar heat gain coefficient (SHGC), a low U value and high insulation. At the same time our windows provide good daylighting. Our innovative window design offers architects and building designers the opportunity to choose their desired energy performance, excellent sound reduction, external pane can be self-cleaning, or a resistance to wind load, blasts, bullets or hurricanes. SRT windows would provide energy savings that are estimated at up to 30% over traditional window systems. Glass fabricators will be able to use existing equipment to make the SRT window while adding value and flexibility to the basic design. Glazing installers will have the ability to fit the windows with traditional methods without wires, power supplies and controllers. SRT windows can be retrofit into existing buildings,
Date:
October 27, 2006
Creator:
Millett, F,A & Byker,H, J
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 31, Number 43, Pages 8783-8922, October 27, 2006
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
October 27, 2006
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Title XVI Water Reuse Program: Implementation and Legislative Issues
None
Date:
October 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Transcription: Mvkangya and the monkeys
This is a narrative about Makangya who lived with a group of monkeys. He pretends to be dead and the monkeys throw him off a cliff, where he meets a tiger.
Date:
October 27, 2006
Creator:
LaPolla, Randy
Object Type:
Text
System:
The UNT Digital Library
United Nations Regular Budget Contributions: Members Compared, 1989-2005
None
Date:
October 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[2006 Election Timetable for 2007 Board of Directors]
Texas Daily Newspaper Associations' 2006 election timetable for the 2007 board of directors. The timetable begins on October 05, 2006 with a letter to the TDNA president outlining the nomination process, to November 27, 2006 with the news release of the new board of directors to serve in 2007.
Date:
September 27, 2006
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
[2007 TDNA Officer sand Directors]
Texas Daily Newspaper Associations' list for the 2007 TDNA officers and directors. The officers are, president Charles Moser, vice president Gary Borders, treasurer Nelson Clyde IV, and chairman of the directors Jeremy L. Halbreich. The TDNA directors are, Patrick J. Birmingham, Darrell Coleman, M. Olaf Frandsen, Belinda Gaudet, Charles A. Spence and Doug Toney. Two spots within the TDNA directors are vacant.
Date:
September 27, 2006
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
AFCI Storage & Disposal FY-06 Progress Report
AFCI Storage and Disposal participants at LLNL, ANL and INL provide assessment of how AFCI technology can optimize the future evolution of the fuel cycle, including optimization of waste management. Evaluation of material storage and repository disposal technical issues provides feedback on criteria and metrics for AFCI, and evaluation of AFCI waste streams provides technical alternatives for future repository optimization. LLNL coordinates this effort that includes repository analysis at ANL and incorporation of repository impacts into AFCI criteria at INL. Cooperative evaluation with YMP staff is pursued to provide a mutually agreed technical base. Cooperation with select international programs is supported.
Date:
September 27, 2006
Creator:
Halsey, W G; Wigeland, R & Dixon, B
Object Type:
Report
System:
The UNT Digital Library
African-American News & Issues (Houston, Tex.), Vol. 11, No. 34, Ed. 1 Wednesday, September 27, 2006
Newspaper from Houston, Texas that includes local, state, and national news along with advertising.
Date:
September 27, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 108, No. 154, Ed. 1 Wednesday, September 27, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 27, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysis of Recent Manifests for Goods Imported through US Ports
Several active interrogation techniques are being developed to detect shielded special nuclear materials (SNM) hidden in cargo containers loaded on container ships arriving at US ports. It raises the questions of the types of cargos in which SNM could be hidden, and their impact on detected signatures. Since the definition of a set of ''typical'' or standard cargos has proven to be difficult, we analyzed shipping manifests for US imports shipped through North American ports collected on 14 days distributed over 12 months. From these data, we generated several distribution functions such as commodity categories, average densities, and packaging types that could be of interest to the cargo scanning community. One of the cargo scanning techniques currently under development at LLNL is based on neutron active interrogation, and relies on the unique signature of beta-delayed gammas emitted by fission products in the 3 to 7 MeV energy range. {sup 19}F(n,a){sup 16}N, has been identified as the main potential interference for 7 and 9 MeV neutron beams. Estimates of cargo compositions based on manifests identified as containing fluorine are presented.
Date:
September 27, 2006
Creator:
Descalle, M; Manatt, D & Slaughter, D
Object Type:
Report
System:
The UNT Digital Library
Asymptotic Analysis of Time-Dependent Neutron Transport Coupled with Isotopic Depletion and Radioactive Decay
We describe an asymptotic analysis of the coupled nonlinear system of equations describing time-dependent three-dimensional monoenergetic neutron transport and isotopic depletion and radioactive decay. The classic asymptotic diffusion scaling of Larsen and Keller [1], along with a consistent small scaling of the terms describing the radioactive decay of isotopes, is applied to this coupled nonlinear system of equations in a medium of specified initial isotopic composition. The analysis demonstrates that to leading order the neutron transport equation limits to the standard time-dependent neutron diffusion equation with macroscopic cross sections whose number densities are determined by the standard system of ordinary differential equations, the so-called Bateman equations, describing the temporal evolution of the nuclide number densities.
Date:
September 27, 2006
Creator:
Brantley, P S
Object Type:
Article
System:
The UNT Digital Library
Averages of B-Hadron Properties at the End of 2005
This article reports world averages for measurements on b-hadron properties obtained by the Heavy Flavor Averaging Group (HFAG) using the available results as of at the end of 2005. In the averaging, the input parameters used in the various analyses are adjusted (rescaled) to common values, and all known correlations are taken into account. The averages include lifetimes, neutral meson mixing parameters, parameters of semileptonic decays, branching fractions of B decays to final states with open charm, charmonium and no charm, and measurements related to CP asymmetries.
Date:
September 27, 2006
Creator:
Barberio, E.; U., /Melbourne; Bizjak, I.; /Novosibirsk, IYF; Blyth, S.; /CERN et al.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 307, Ed. 1 Wednesday, September 27, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 27, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Benchmark Calculation Of Inclusive Responses In The Four-Body Nuclear System
This paper reports on a recent benchmark calculation in the four-nucleon system, aimed at investigating the reliability of the no-core shell model (NCSM) approach to the description of inclusive response functions via the Lorentz integral transform (LIT) method.
Date:
September 27, 2006
Creator:
Quaglioni, S.; Stetcu, I.; Bacca, S.; Barrett, B. R.; Johnson, C. W.; Navratil, P. et al.
Object Type:
Article
System:
The UNT Digital Library