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Characterization of Oxy-combustion Impacts in Existing Coal-fired Boilers

Characterization of Oxy-combustion Impacts in Existing Coal-fired Boilers

Date: June 30, 2009
Creator: Adams, Bradley; Fry, Andrew; Senior, Constance; Shim, Hong; Wang, Huafeng; Wendt, Jost et al.
Description: This report summarizes Year 1 results of a research program designed to use multi-scale experimental studies and fundamental theoretical models to characterize and predict the impacts of retrofit of existing coal-fired utility boilers for oxy-combustion. Through the course of Year 1 activities, great progress was made toward understanding the issues associated with oxy-combustion retrofit of coal-fired boilers. All four Year 1 milestones and objectives have been, or will be, completed on schedule and within budget. Progress in the four milestone areas may be summarized as follows: • University of Utah has performed size segregated ash composition measurements in the Oxy-Fuel Combustor (OFC). These experiments indicate that oxy-combustion retrofit may impact ash aerosol mineral matter composition. Both flame temperature and flue gas composition have been observed to influence the concentration of calcium, magnesium and iron in the fine particulate. This could in turn impact boiler fouling and slagging. • Sandia National Labs has shown that char oxidation rate is dependent on particle size (for sizes between 60 and 100 microns) by performing fundamental simulations of reacting char particles. These predictions will be verified by making time-resolved optical measurements of char particle temperature, velocity and size in bench-scale experiments before the end ...
Contributing Partner: UNT Libraries Government Documents Department
Progress and prospects for an FI relevant point design

Progress and prospects for an FI relevant point design

Date: November 2, 2011
Creator: Key, M; Amendt, P; Bellei, C; Clark, D; Cohen, B; Divol, L et al.
Description: The physics issues involved in scaling from sub ignition to high gain fast ignition are discussed. Successful point designs must collimate the electrons and minimize the stand off distance to avoid multi mega-joule ignition energies. Collimating B field configurations are identified and some initial designs are explored.
Contributing Partner: UNT Libraries Government Documents Department
A Compact and High Performance Muon Capture Channel for Muon Accelerators

A Compact and High Performance Muon Capture Channel for Muon Accelerators

Date: March 28, 2011
Creator: Stratakis, D.; Gallardo, J. & Palmer, R.B.
Description: It is widely believed that a neutrino factory would deliver unparallel performance in studying neutrino mixing and would provide tremendous sensitivity to new physics in the neutrino sector. Here we will describe and simulate the front-end of the neutrino factory system, which plays critical role in determining the number of muons that can be accepted by the downstream accelerators. In this system, a proton bunch on a target creates secondaries that drift into a capture transport channel. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to nearly equal central energies, and initiates ionization cooling. For this, the muon beams are transported through sections containing high-gradient cavities and strong focusing solenoids. In this paper we present results of optimization and variation studies toward obtaining the maximum number of muons for a neutrino factory by using a compact transport channel. It has been suggested computationally and experimentally that the maximum achievable gradient is enhanced by introducing an external magnetic field at right angles to the rf electric field since it suppresses field-emission processes. Here, we have discussed a possible scheme for extending the concept of magnetic insulation to capture, transport, ...
Contributing Partner: UNT Libraries Government Documents Department
Calculation of TMD Evolution for Transverse Single Spin Asymmetry Measurements

Calculation of TMD Evolution for Transverse Single Spin Asymmetry Measurements

Date: June 1, 2012
Creator: Mert Aybat, Ted Rogers, Alexey Prokudin
Description: In this letter, we show that it is necessary to include the full treatment of QCD evolution of Transverse Momentum Dependent parton densities to explain discrepancies between HERMES data and recent COMPASS data on a proton target for the Sivers transverse single spin asymmetry in Semi-Inclusive Deep Inelastic Scattering (SIDIS). Calculations based on existing fits to TMDs in SIDIS, and including evolution within the Collins-Soper-Sterman with properly defined TMD PDFs are shown to provide a good explanation for the discrepancy. The non-perturbative input needed for the implementation of evolution is taken from earlier analyses of unpolarized Drell-Yan (DY) scattering at high energy. Its success in describing the Sivers function in SIDIS data at much lower energies is strong evidence in support of the unifying aspect of the QCD TMD-factorization formalism.
Contributing Partner: UNT Libraries Government Documents Department
Power Plant Replacement Study

Power Plant Replacement Study

Date: September 30, 2010
Creator: Reed, Gary
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Evapotranspiration Cover for the 92-Acre Area Retired Mixed Waste Pits, Area 5 Waste Management Division, Nevada National Security Site, Final CQA Report

Evapotranspiration Cover for the 92-Acre Area Retired Mixed Waste Pits, Area 5 Waste Management Division, Nevada National Security Site, Final CQA Report

Date: January 31, 2012
Creator: Management, NSTec Environmental; The Delphi Groupe, Inc. & J. A. Cesare and Associates, Inc.
Description: The report is the Final Construction Quality Assurance (CQA) Report for the 92-Acrew Evapotranspiration Cover, Area 5 Waste Management Division Retired Mixed Waste Pits, Nevada National Security Site, Nevada, for the period of January 20, 2011, to January 31, 2012 The Area 5 RWMS uses engineered shallow-land burial cells to dispose of packaged waste. The 92-Acre Area encompasses the southern portion of the Area 5 RWMS, which has been designated for the first final closure operations. This area contains 13 Greater Confinement Disposal (GCD) boreholes, 16 narrow trenches, and 9 broader pits. With the exception of two active pits (P03 and P06), all trenches and pits in the 92-Acre Area had operational covers approximately 2.4 meters thick, at a minimum, in most areas when this project began. The units within the 92-Acre Area are grouped into the following six informal categories based on physical location, waste types and regulatory requirements: (1) Pit 3 Mixed Waste Disposal Unit (MWDU); (2) Corrective Action Unit (CAU) 111; (3) CAU 207; (4) Low-level waste disposal units; (5) Asbestiform low-level waste disposal units; and (6) One transuranic (TRU) waste trench.
Contributing Partner: UNT Libraries Government Documents Department
Numerical Simulation of Beam-Beam Effects in the Proposed Electron-Ion Colider at Jefferson Lab

Numerical Simulation of Beam-Beam Effects in the Proposed Electron-Ion Colider at Jefferson Lab

Date: May 1, 2010
Creator: Balsa Terzic, Yuhong Zhang
Description: One key limiting factor to a collider luminosity is beam-beam interactions which usually can cause serious emittance growth of colliding beams and fast reduction of luminosity. Such nonlinear collective beam effect can be a very serious design challenge when the machine parameters are pushed into a new regime. In this paper, we present simulation studies of the beam-beam effect for a medium energy ring-ring electron-ion collider based on CEBAF.
Contributing Partner: UNT Libraries Government Documents Department
Pion and Kaon Production of Charm and Charm-Strange States

Pion and Kaon Production of Charm and Charm-Strange States

Date: November 1, 1985
Creator: Anjos, J.C.C.; Santoro, A.F.S.; Souza, M.H.G.; /Rio de Janeiro, CBPF; Appel, J.A.; Dixon, R. et al.
Description: We propose an experiment to measure the properties of hadronic charm production using the Tagged Photon Spectrometer facility. We shall measure the flavor, x and A dependence of this process at the same time and in a single apparatus. In addition to collecting several times more charm than any completed or proposed hadronic experiment, we expect to have a sample of F mesons as much as two orders of magnitude more than published efforts. High statistiCs lifetime measurements of several charm states are expected. The experiment is proposed for the next running period. The experiment will record equal numbers of {pi} and K induced events using a fast transverse energy trigger and a modified data acquisition system capable of recording more than 300 events per second. The transverse energy trigger used in E691, providing an enrichment of about 3 over a simple interaction trigger while keeping 80% of the charmed particles, will be used. It will provide at least 300 million events to be examined for possible writing to tape. A new data acquisition system includes 'Level 3' filtering capability before writing events to tape. The experiment requires a minimal hardware extension to an existing and proven facility and will ...
Contributing Partner: UNT Libraries Government Documents Department
Drain Tank Information for Developing Design Basis of the Preliminary Design

Drain Tank Information for Developing Design Basis of the Preliminary Design

Date: August 1, 2011
Creator: Ferrada, Juan J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
MELCOR model for an experimental 17x17 spent fuel PWR assembly.

MELCOR model for an experimental 17x17 spent fuel PWR assembly.

Date: November 1, 2010
Creator: Cardoni, Jeffrey
Description: A MELCOR model has been developed to simulate a pressurized water reactor (PWR) 17 x 17 assembly in a spent fuel pool rack cell undergoing severe accident conditions. To the extent possible, the MELCOR model reflects the actual geometry, materials, and masses present in the experimental arrangement for the Sandia Fuel Project (SFP). The report presents an overview of the SFP experimental arrangement, the MELCOR model specifications, demonstration calculation results, and the input model listing.
Contributing Partner: UNT Libraries Government Documents Department