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2009 Toxic Chemical Release Inventory Report for the Emergency Planning and Community Right-to-Know Act of 1986, Title III, Section 313
For reporting year 2009, Los Alamos National Laboratory (LANL) submitted a Form R report for lead as required under the Emergency Planning and Community Right-to- Know Act (EPCRA) Section 313. No other EPCRA Section 313 chemicals were used in 2009 above the reportable thresholds. This document was prepared to provide a description of the evaluation of EPCRA Section 313 chemical use and threshold determinations for LANL for calendar year 2009, as well as to provide background information about data included on the Form R reports.
Date:
November 1, 2010
Creator:
(ENV-ES), Environmental Stewardship Group
Object Type:
Report
System:
The UNT Digital Library
Development of Regional Wind Resource and Wind Plant Output Datasets: Final Subcontract Report, 15 October 2007 - 15 March 2009
This report describes the development of the necessary and needed wind and solar datasets used in the Western Wind and Solar Integration Study (WWSIS).
Date:
March 1, 2010
Creator:
3TIER, Seattle, Washington
Object Type:
Report
System:
The UNT Digital Library
[Funeral Program for Elnora Coleman-Cunningham, February 1, 2011]
Funeral program for Elnora Coleman-Cunningham, born September 30, 1915 and died January 23, 2011. The funeral was held February 1, 2011 at Mt. Sinai Baptist Church, officiated by Rev. Jessie Hardeman. Funeral arrangements were made through Lewis Funeral Home and she was buried in Meadowlawn Memorial Park in San Antonio, Texas.
Date:
February 1, 2011
Creator:
A Clark's Creation
Object Type:
Pamphlet
System:
The Portal to Texas History
Nuclear physics with a medium-energy Electron-Ion Collider
A polarized ep/eA collider (Electron-Ion Collider, or EIC) with variable center-of-mass energy {radical}s {approx} 20-70 GeV and a luminosity {approx}10{sup 34} cm{sup -2} s{sup -1} would be uniquely suited to address several outstanding questions of Quantum Chromodynamics (QCD) and the microscopic structure of hadrons and nuclei: (i) the three-dimensional structure of the nucleon in QCD (sea quark and gluon spatial distributions, orbital motion, polarization, correlations); (ii) the fundamental color fields in nuclei (nuclear parton densities, shadowing, coherence effects, color transparency); (iii) the conversion of color charge to hadrons (fragmentation, parton propagation through matter, in-medium jets). We briefly review the conceptual aspects of these questions and the measurements that would address them, emphasizing the qualitatively new information that could be obtained with the collider. Such a medium-energy EIC could be realized at Jefferson Lab after the 12 GeV Upgrade (MEIC), or at Brookhaven National Lab as the low-energy stage of eRHIC.
Date:
June 1, 2012
Creator:
A. Accardi, V. Guzey, A. Prokudin, C. Weiss
Object Type:
Article
System:
The UNT Digital Library
Raising Photoemission Efficiency with Surface Acoustic Waves
We are developing a novel technique that may help increase the efficiency and reduce costs of photoelectron sources used at electron accelerators. The technique is based on the use of Surface Acoustic Waves (SAW) in piezoelectric materials, such as GaAs, that are commonly used as photocathodes. Piezoelectric fields produced by the traveling SAW spatially separate electrons and holes, reducing their probability of recombination, thereby enhancing the photoemission quantum efficiency of the photocathode. Additional advantages could be increased polarization provided by the enhanced mobility of charge carriers that can be controlled by the SAW and the ionization of optically-generated excitons resulting in the creation of additional electron-hole pairs. It is expected that these novel features will reduce the cost of accelerator operation. A theoretical model for photoemission in the presence of SAW has been developed, and experimental tests of the technique are underway.
Date:
July 1, 2012
Creator:
A. Afanasev, F. Hassani, C.E. Korman, V.G. Dudnikov, R.P. Johnson, M. Poelker, K.E.L. Surles-Law
Object Type:
Article
System:
The UNT Digital Library
Epicyclic Twin-helix Magnetic Structure for Parametric-resonance Ionization Cooling
Parametric-resonance Ionization Cooling (PIC) is envisioned as the final 6D cooling stage of a high-luminosity muon collider. Implementing PIC imposes stringent constraints on the cooling channel's magnetic optics design. This paper presents a linear optics solution compatible with PIC. Our solution consists of a superposition of two opposite-helicity equal-period and equal-strength helical dipole harmonics and a straight normal quadrupole. We demonstrate that such a system can be adjusted to meet all of the PIC linear optics requirements while retaining large acceptance.
Date:
May 1, 2010
Creator:
A. Afanasev, R.P. Johnson, Y.S. Derbenev, V.S. Morozov
Object Type:
Article
System:
The UNT Digital Library
Quadratic electroweak corrections for polarized Moller scattering
The paper discusses the two-loop (NNLO) electroweak radiative corrections to the parity violating electron-electron scattering asymmetry induced by squaring one-loop diagrams. The calculations are relevant for the ultra-precise 11 GeV MOLLER experiment planned at Jefferson Laboratory and experiments at high-energy future electron colliders. The imaginary parts of the amplitudes are taken into consideration consistently in both the infrared-finite and divergent terms. The size of the obtained partial correction is significant, which indicates a need for a complete study of the two-loop electroweak radiative corrections in order to meet the precision goals of future experiments.
Date:
January 1, 2012
Creator:
A. Aleksejevs, S. Barkanova, Y. Kolomensky, E. Kuraev, V. Zykunov
Object Type:
Article
System:
The UNT Digital Library
Production and Testing Experience with the SRF Cavities for the CEBAF 12 GeV Upgrade
The CEBAF recirculating CW electron linear accelerator at Jefferson Lab is presently undergoing a major upgrade to 12 GeV. This project includes the fabrication, preparation, and testing of 80 new 7-cell SRF cavities, followed by their incorporation into ten new cryomodules for subsequent testing and installation. In order to maximize the cavity Q over the full operable dynamic range in CEBAF (as high as 25 MV/m), the decision was taken to apply a streamlined preparation process that includes a final light temperature-controlled electropolish of the rf surface over the vendor-provided bulk BCP etch. Cavity processing work began at JLab in September 2010 and will continue through December 2011. The excellent performance results are exceeding project requirements and indicate a fabrication and preparation process that is stable and well controlled. The cavity production and performance experience to date will be summarized and lessons learned reported to the community.
Date:
September 1, 2011
Creator:
A. Burrill, G.K. Davis, F. Marhauser, C.E. Reece, A.V. Reilly, M. Stirbet
Object Type:
Article
System:
The UNT Digital Library
The Muon LINAC for the International Design Study of the Neutrino Factory
The first stage of muon acceleration in the Neutrino Factory utilises a superconducting linac to accelerate muons from 244 MeV to 900 MeV. The linac was split into three types of cryomodules with decreasing magnetic fields and increasing amounts of RF voltage but with the design of the superconducting solenoid and RF cavities being the same for all cryomodules. The current status of the muon linac for the International Design Study for the Neutrino Factory will be presented including a final lattice design of the linac and tracking simulations.
Date:
September 1, 2011
Creator:
A. Kurup, C. Bontoiu, Morteza Aslaninejad, J. Pozimski, A. Bogacz, V.S. Morozov, Y.R. Roblin, K.B. Beard
Object Type:
Article
System:
The UNT Digital Library
Energy Recovery Linac: 5 Cell 704 MHz SRF Cavity
N/A
Date:
January 1, 2010
Creator:
A., Burrill
Object Type:
Report
System:
The UNT Digital Library
Energy Recovery Linac: SRF Electron Gun
N/A
Date:
January 1, 2010
Creator:
A., Burrill
Object Type:
Report
System:
The UNT Digital Library
Analysis of Vernier Scans during the PP2PP run in 2009 (pp at 100 GeV/beam)
N/A
Date:
May 1, 2012
Creator:
A., Drees
Object Type:
Report
System:
The UNT Digital Library
Intra-beam scattering and its applications to ERL
N/A
Date:
July 1, 2012
Creator:
A., Fedotov
Object Type:
Report
System:
The UNT Digital Library
Projections of potential luminosity improvement for low-energy RHIC operation with electron cooling
N/A
Date:
April 1, 2013
Creator:
A., Fedotov
Object Type:
Report
System:
The UNT Digital Library
Towards demonstration of electron cooling with bunched electron beam
N/A
Date:
May 1, 2012
Creator:
A., Fedotov
Object Type:
Report
System:
The UNT Digital Library
Potential for Luminosity improvement for low-energy RHIC operations with long bunches
N/A
Date:
July 1, 2012
Creator:
A., Fedotov & Blaskiewicz, M.
Object Type:
Report
System:
The UNT Digital Library
Energy Recovery Linac: Magnetic Measurement of the ERL Magnets
N/A
Date:
January 1, 2010
Creator:
A., Jain
Object Type:
Report
System:
The UNT Digital Library
Electron-lens test stand instrumentation progress
N/A
Date:
October 1, 2012
Creator:
A., Miller T.; Aronson, J.; Gassner, D.M.; Gu, X.; Pikin, A. & Thieberger, P.
Object Type:
Article
System:
The UNT Digital Library
Optics modification of the electron collector for the Relativistic Heavy Ion Collider Electron Beam Ion Source
N/A
Date:
May 1, 2012
Creator:
A., Pikin; Alessi, J.G.; Beebe, E.N.; Raparia, D. & Snydstrup, L.
Object Type:
Report
System:
The UNT Digital Library
Optics modification of the electron collector for the Relativistic Heavy Ion Collider Electron Beam Ion Source
N/A
Date:
May 1, 2012
Creator:
A., Pikin; Alessi, J.G.; Beebe, E.N.; Raparia, D. & Snydstrup, L.
Object Type:
Report
System:
The UNT Digital Library
A Rosetta Stone Relating Conventions In Photo-Meson Partial Wave Analyses
A new generation of complete experiments in pseudoscalar meson photo-production is being pursued at several laboratories. While new data are emerging, there is some confusion regarding definitions of asymmetries and the conventions used in partial wave analyses (PWA). We present expressions for constructing asymmetries as coordinate-system independent ratios of cross sections, along with the names used for these ratios by different PWA groups.
Date:
April 1, 2012
Creator:
A.M. Sandorfi, B. Dey, A. Sarantsev, L. Tiator, R. Workman
Object Type:
Article
System:
The UNT Digital Library
Effects of the Thickness of Niobium Surface Oxide Layers on Field Emission
Field emission on the inner surfaces of niobium superconducting radio frequency cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results* seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodization technique, the thickness of the surface pentoxide layer was artificially fabricated from 3 nm up to 460 nm. A home-made scanning field emission microscope was employed to perform the scans on the surfaces. Emitters were characterized using a scanning electron microscope together with an energy dispersive x-ray analyzer. The SFEM experimental results were analyzed in terms of surface morphology and oxide thickness of Nb samples and chemical composition and geographic shape of the emitters. A model based on the classic electromagnetic theory was developed trying to understand the experimental results. Possibly implications for Nb SRF cavity applications from this study will be discussed.
Date:
September 1, 2011
Creator:
A.T. Wu, S. Jin, J.D. Mammosser, R.A. Rimmer, X.Y. Lu, K. Zhao
Object Type:
Article
System:
The UNT Digital Library
Fastest Electropolishing Technique on Niobium for Particle Accelerators
Field emission on the inner surfaces of niobium (Nb) superconducting radio frequency (SRF) cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results [1] seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodization technique, the thickness of the surface pentoxide layer was artificially fabricated from 3nm up to 460nm. A home-made scanning field emission microscope (SFEM) was employed to perform the scans on the surfaces. Emitters were characterized using a scanning electron microscope together with an energy dispersive x-ray analyzer. The experimental results could be understood by a simple model calculation based on classic electromagnetic theory as shown in Ref.1. Possibly implications for Nb SRF cavity applications from this study will be discussed.
Date:
September 1, 2011
Creator:
A.T. Wu, S. Jin, R.A. Rimmer, X.Y. Lu, K. Zhao
Object Type:
Article
System:
The UNT Digital Library
Progress of Bep Treatments on Nb at JLAB
Recent experimental results have indicated that Buffered Electropolishing (BEP) is a promising candidate for the next generation of surface treatment technique for Nb superconducting radio frequency (SRF) cavities to be used in particle accelerators. In order to lay the foundation for using BEP as the next generation surface treatment technique for Nb SRF cavities, some fundamental aspects of BEP treatments for Nb have to be investigated. In this report, recent progress on BEP study at JLab is shown. Improvements on the existing vertical BEP are made to allow water cooling from outside of a Nb single cell cavity in addition to cooling provided by acid circulation so that the temperature of the cavity can be stable during processing. Some investigation on the electrolyte mixture was performed to check the aging effect of the electrolyte. It is shown that good polishing results can still be obtained on Nb at a current density of 171 mA/cm when the BEP electrolyte was at the stationary condition and was more than 1.5 years old.
Date:
May 1, 2010
Creator:
A.T. Wu, S. Jin, R.A. Rimmer,X.Y. Lu, K. Zhao
Object Type:
Article
System:
The UNT Digital Library