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Multi-Physics Analysis of the Fermilab Booster RF Cavity
After about 40 years of operation the RF accelerating cavities in Fermilab Booster need an upgrade to improve their reliability and to increase the repetition rate in order to support a future experimental program. An increase in the repetition rate from 7 to 15 Hz entails increasing the power dissipation in the RF cavities, their ferrite loaded tuners, and HOM dampers. The increased duty factor requires careful modelling for the RF heating effects in the cavity. A multi-physic analysis investigating both the RF and thermal properties of Booster cavity under various operating conditions is presented in this paper.
Date:
May 14, 2012
Creator:
Awida, M.; Reid, J.; Yakovlev, V.; Lebedev, V.; Khabiboulline, T. & Champion, M.
Object Type:
Article
System:
The UNT Digital Library
Pressure Sensitivity Characterization of Superconducting Spoke Cavities
None
Date:
May 1, 2012
Creator:
Awida, M.H.; Gonin, I.V.; Ristori, L.; Yakovlev, V.P.; /Fermilab; Passarelli, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Analysis and Design of MEBT Beam Absorber for Project-X
A beam absorber is needed for a new high power accelerator to be built in Fermilab. It is called Project-X and should replace the existing linac and the 8 GeV Booster synchrotron. The beam absorber is part of the bunch-by-bunch chopper assigned to create an arbitrary bunch sequence required by experimental program. It will be located in the middle of the medium energy beam transport (MEBT) and has to remove the unnecessary bunches from the initially uniform bunch structure supplied by 2.1 MeV CW RFQ. At nominal RFQ beam current of 5 mA, the maximum power delivered to the beam absorber is about 10 kW. Beam optics requirements result in that the length allocated to the beam absorber is short ({approx}400 mm) and the beam size is small ({sigma}{approx}2mm). That yields high power density of the beam arriving to the absorber. The paper presents the thermal and mechanical analysis of one of proposed designs.
Date:
May 1, 2012
Creator:
Awida, Mohamed H.; Lebedev, Valeri & Yakovlev, Vyacheslav P.
Object Type:
Article
System:
The UNT Digital Library
Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model
We utilize a light-front relativistic quark model (LF RQM) to predict the 3q core contribution to the electroexcitation amplitudes for the {Delta}(1232)P{sub 33}, N(1440)P{sub 11}, N(1520)D{sub 13}, and N(1535)S{sub 11} up to Q{sup 2} = 12 GeV{sup 2}. The parameters of the model have been specified via description of the nucleon electromagnetic form factors in the approach that combines 3q and pion-cloud contributions in the LF dynamics.
Date:
May 1, 2012
Creator:
Aznauryan Inna, Burkert Volker
Object Type:
Article
System:
The UNT Digital Library
Direct Wind Superconducting Corrector Magnets for the SUPERKEKB IR
N/A
Date:
May 21, 2012
Creator:
B., Parker; Anerella, M.; Escallier, J.; Ghosh, A.; Jain, A.; Marone, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Sivers and Boer-Mulders observables from lattice QCD.
We present a first calculation of transverse momentum dependent nucleon observables in dynamical lattice QCD employing non-local operators with staple-shaped, 'process-dependent' Wilson lines. The use of staple-shaped Wilson lines allows us to link lattice simulations to TMD effects determined from experiment, and in particular to access non-universal, naively time-reversal odd TMD observables. We present and discuss results for the generalized Sivers and Boer-Mulders transverse momentum shifts for the SIDIS and DY cases. The effect of staple-shaped Wilson lines on T-even observables is studied for the generalized tensor charge and a generalized transverse shift related to the worm gear function g{sub 1}T. We emphasize the dependence of these observables on the staple extent and the Collins-Soper evolution parameter. Our numerical calculations use an n{sub f} = 2+1 mixed action scheme with domain wall valence fermions on an Asqtad sea and pion masses 369 MeV as well as 518 MeV.
Date:
May 1, 2012
Creator:
B.U. Musch, Ph. Hagler, M. Engelhardt, J.W. Negele, A. Schafer
Object Type:
Article
System:
The UNT Digital Library
Consumer Perception of Brand Equity Measurement: a New Scale
Brand equity is perhaps the most important marketing concept in both academia and practice. The term came into use during the late 1980s; and the importance of conceptualizing, measuring, and managing brand equity has grown rapidly in the eyes of practitioners and academics alike. This has resulted in several often-divergent view-points on the dimensions of brand equity, the factors that influence it, the perspectives from which it should be studied, and the ways to measure it. Many different definitions and ways to measure brand equity have been proposed, and most of them are based upon the definition: the added value with which a given brand endows a product. The two most influential conceptualizations of brand equity are Aaker and Keller. Aaker defines brand equity as a set of brand assets and liabilities linked to a brand, its name and symbol, that add to or subtract from the value provided by a product or service to a firm and/or to that firm’s customers. Keller defines consumer-based brand equity (CBBE) as the differential effect of brand knowledge on consumer response to the marketing of the brand. Currently, all research on brand equity has used the same conceptualization of the construct based on …
Date:
May 2012
Creator:
Baalbaki, Sally Samih
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
DEVELOPMENT OF NEW MID-INFRARED ULTRAFAST LASER SOURCES FOR COMPACT COHERENT X-RAY SOURCES
In this project, we proposed to develop laser based mid-infrared lasers as a potentially robust and reliable source of ultrafast pulses in the mid-infrared region of the spectrum, and to apply this light source to generating bright, coherent, femtosecond-to-attosecond x-ray beams.
Date:
May 14, 2012
Creator:
Backus, Sterling
Object Type:
Report
System:
The UNT Digital Library
Energy Renovations: Volume 17: Insulation - A Guide for Contractors to Share with Homeowners
This report was prepared by PNNL for DOE's Building America program and is intended as a guide that energy performance contractors can share with homeowners to describe various insulation options for improving the energy performance and comfort of existing homes. The report provides descriptions of many common insulation types, including their advantages and disadvantages, R-values, characteristics, and typical uses. The report also describes potentially hazardous products such as asbestos and formaldehyde and safety issues when conducting energy-efficient upgrades including radon. The guide is available for download at the DOE Building America website, www.buildingamerica.gov.
Date:
May 15, 2012
Creator:
Baechler, Michael C.; Adams, Karen; Hefty, Marye G.; Gilbride, Theresa L. & Love, Pat M.
Object Type:
Report
System:
The UNT Digital Library
Design Considerations for an MEBT Chopper Absorber of 2.1 MeV H- at the Project X Injector Experiment at Fermilab
The Project X Injector Experiment (PIXIE) will be a prototype of the Project X front end that will be used to validate the design concept and decrease technical risks. One of the most challenging components of PIXIE is the wide-band chopping system of the Medium Energy Beam Transport (MEBT) section, which will form an arbitrary bunch pattern from the initially CW 162.5 MHz 5mA beam. The present scenario assumes diverting 80% of the beam to an absorber to provide a beam with the average current of 1mA to SRF linac. This absorber must withstand a high level of energy deposition and high ion fluence, while being positioned in proximity of the superconductive cavities. This paper discusses design considerations for the absorber. Thermal and mechanical analyses of a conceptual design are presented, and future plans for the fabrication and testing of a prototype are described.
Date:
May 14, 2012
Creator:
Baffes, C.; Awida, M.; Chen, A.; Eidelman, Y.; Lebedev, V.; Prost, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Mechanical Design of a High Energy Beam Absorber for the Advanced Superconducting Test Accelerator (ASTA) at Fermilab
A high energy beam absorber has been built for the Advanced Superconducting Test Accelerator (ASTA) at Fermilab. In the facility's initial configuration, an electron beam will be accelerated through 3 TTF-type or ILC-type SRF cryomodules to an energy of 750MeV. The electron beam will be directed to one of multiple downstream experimental and diagnostic beam lines and then deposited in one of two beam absorbers. The facility is designed to accommodate up to 6 cryomodules, which would produce a 75kW beam at 1.5GeV; this is the driving design condition for the beam absorbers. The beam absorbers consist of water-cooled graphite, aluminum and copper layers contained in a helium-filled enclosure. This paper describes the mechanical implementation of the beam absorbers, with a focus on thermal design and analysis. The potential for radiation-induced degradation of the graphite is discussed.
Date:
May 10, 2012
Creator:
Baffes, C.; Church, M.; Leibfritz, J.; Oplt, S. & Rakhno, I.
Object Type:
Article
System:
The UNT Digital Library
Rare-Earth-Free Traction Motor
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Rare Earth Alternatives in Critical Technologies (REACT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses a new type of traction motor for electric vehicles as part of the "Rare Earth-Free Traction Motor for Electric Vehicle Applications" project.
Date:
May 25, 2012
Creator:
Baldor Electric Company
Object Type:
Text
System:
The UNT Digital Library
Transformer Efficiency Assessment - Okinawa, Japan
The US Army Engineering & Support Center, Huntsville (USAESCH), and the US Marine Corps Base (MCB), Okinawa, Japan retained Idaho National Laboratory (INL) to conduct a Transformer Efficiency Assessment of “key” transformers located at multiple military bases in Okinawa, Japan. The purpose of this assessment is to support the Marine Corps Base, Okinawa in evaluating medium voltage distribution transformers for potential efficiency upgrades. The original scope of work included the MCB providing actual transformer nameplate data, manufacturer’s factory test sheets, electrical system data (kWh), demand data (kWd), power factor data, and electricity cost data. Unfortunately, the MCB’s actual data is not available and therefore making it necessary to de-scope the original assessment. Note: Any similar nameplate data, photos of similar transformer nameplates, and basic electrical details from one-line drawings (provided by MCB) are not a replacement for actual load loss test data. It is recommended that load measurements are performed on the high and low sides of transformers to better quantify actual load losses, demand data, and power factor data. We also recommend that actual data, when available, be inserted by MCB Okinawa where assumptions have been made and then the LCC analysis updated. This report covers a generalized assessment …
Date:
May 1, 2012
Creator:
Baldwin, Thomas L.; Turk, Robert J.; Myers, Kurt S.; Gentle, Jake P. & Bush, Jason W.
Object Type:
Report
System:
The UNT Digital Library
Transformer Efficiency Assessment - Okinawa, Japan
The US Army Engineering & Support Center, Huntsville (USAESCH), and the US Marine Corps Base (MCB), Okinawa, Japan retained Idaho National Laboratory (INL) to conduct a Transformer Efficiency Assessment of “key” transformers located at multiple military bases in Okinawa, Japan. The purpose of this assessment is to support the Marine Corps Base, Okinawa in evaluating medium voltage distribution transformers for potential efficiency upgrades. The original scope of work included the MCB providing actual transformer nameplate data, manufacturer’s factory test sheets, electrical system data (kWh), demand data (kWd), power factor data, and electricity cost data. Unfortunately, the MCB’s actual data is not available and therefore making it necessary to de-scope the original assessment. Note: Any similar nameplate data, photos of similar transformer nameplates, and basic electrical details from one-line drawings (provided by MCB) are not a replacement for actual load loss test data. It is recommended that load measurements are performed on the high and low sides of transformers to better quantify actual load losses, demand data, and power factor data. We also recommend that actual data, when available, be inserted by MCB Okinawa where assumptions have been made and then the LCC analysis updated. This report covers a generalized assessment …
Date:
May 1, 2012
Creator:
Baldwin, Thomas L.; Turk, Robert J.; Myers, Kurt S.; Gentle, Jake P. & Bush, Jason W.
Object Type:
Report
System:
The UNT Digital Library
HTGR Measurements and Instrumentation Systems
This report provides an integrated overview of measurements and instrumentation for near-term future high-temperature gas-cooled reactors (HTGRs). Instrumentation technology has undergone revolutionary improvements since the last HTGR was constructed in the United States. This report briefly describes the measurement and communications needs of HTGRs for normal operations, maintenance and inspection, fuel fabrication, and accident response. The report includes a description of modern communications technologies and also provides a potential instrumentation communications architecture designed for deployment at an HTGR. A principal focus for the report is describing new and emerging measurement technologies with high potential to improve operations, maintenance, and accident response for the next generation of HTGRs, known as modular HTGRs, which are designed with passive safety features. Special focus is devoted toward describing the failure modes of the measurement technologies and assessing the technology maturity.
Date:
May 2012
Creator:
Ball, Sydney J.; Holcomb, David Eugene & Cetiner, Mustafa Sacit
Object Type:
Report
System:
The UNT Digital Library
Richardson Extrapolation for Linearly Degenerate Discontinuities
None
Date:
May 21, 2012
Creator:
Banks, J W & Aslam, T D
Object Type:
Article
System:
The UNT Digital Library
A stable FSI algorithm for light rigid bodies in compressible flow
None
Date:
May 21, 2012
Creator:
Banks, J. W.; Henshaw, W. D. & Sjogreen, B.
Object Type:
Article
System:
The UNT Digital Library
The FE-I4 Pixel Readout Chip and the IBL Module
FE-I4 is the new ATLAS pixel readout chip for the upgraded ATLAS pixel detector. Designed in a CMOS 130 nm feature size process, the IC is able to withstand higher radiation levels compared to the present generation of ATLAS pixel Front-End FE-I3, and can also cope with higher hit rate. It is thus suitable for intermediate radii pixel detector layers in the High Luminosity LHC environment, but also for the inserted layer at 3.3 cm known as the 'Insertable B-Layer' project (IBL), at a shorter timescale. In this paper, an introduction to the FE-I4 will be given, focusing on test results from the first full size FE-I4A prototype which has been available since fall 2010. The IBL project will be introduced, with particular emphasis on the FE-I4-based module concept.
Date:
May 1, 2012
Creator:
Barbero, Marlon; Arutinov, David; Backhaus, Malte; Fang, Xiao-Chao; Gonella, Laura; Hemperek, Tomasz et al.
Object Type:
Article
System:
The UNT Digital Library
Islands and Our Renewable Energy Future
Only US Laboratory Dedicated Solely to Energy Efficiency and Renewable Energy. High Contribution Renewables in Islanded Power Systems.
Date:
May 1, 2012
Creator:
Baring-Gould, I.; Gevorgian, V.; Kelley, K. & Conrad, M.
Object Type:
Presentation
System:
The UNT Digital Library
Ecological Significance and Underlying Mechanisms of Body Size Differentiation in White-tailed Deer
Body size varies according to nutritional availability, which is of ecological and evolutionary relevance. The purpose of this study is to test the hypothesis that differences in adult body size are realized by increasing juvenile growth rate for white-tailed deer (Odocoileus virginianus). Harvest records are used to construct growth rate estimates by empirical nonlinear curve fitting. Results are compared to those of previous models that include additional parameters. The rate of growth increases during the study period. Models that estimate multiple parameters may not work with harvest data in which estimates of these parameters are prone to error, which renders estimates from complex models too variable to detect inter-annual changes in growth rate that this simpler model captures
Date:
May 2012
Creator:
Barr, Brannon
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis of Full Charge Reconstruction Algorithms for X-Ray Pixelated Detectors
Existence of the natural diffusive spread of charge carriers on the course of their drift towards collecting electrodes in planar, segmented detectors results in a division of the original cloud of carriers between neighboring channels. This paper presents the analysis of algorithms, implementable with reasonable circuit resources, whose task is to prevent degradation of the detective quantum efficiency in highly granular, digital pixel detectors. The immediate motivation of the work is a photon science application requesting simultaneous timing spectroscopy and 2D position sensitivity. Leading edge discrimination, provided it can be freed from uncertainties associated with the charge sharing, is used for timing the events. Analyzed solutions can naturally be extended to the amplitude spectroscopy with pixel detectors.
Date:
May 21, 2012
Creator:
Baumbaugh, A.; Carini, G.; Deptuch, G.; Grybos, P.; Hoff, J.; Siddons, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Development of an Early-Stage Toll Revenue Estimation Model
This report contains a standalone, spreadsheet-based model that prepares early-stage traffic and toll revenue estimates.
Date:
May 2012
Creator:
Beaty, Curtis & Lieu, Henry
Object Type:
Report
System:
The Portal to Texas History
Mental Toughness: An Analysis of Sex, Race, and Mood
Mental toughness has become a focus for researchers as coaches, athletes, and others extol its influence in performance success. In this study I examined mental toughness among collegiate athletes, focusing on its potential relationship to different demographic variables and to the athletes’ mood. Two hundred seventy-two student-athletes representing 12 different sports from a southwestern NCAA Division I university, participated by completing the Sports Mental Toughness Questionnaire (SMTQ), the Brief Assessment of Mood (BAM), and providing demographic information. Analyses of variance (ANOVA) assessed differences in mental toughness scores by sex, race, scholarship status, and starting status. Significant differences in mental toughness emerged between Black – White, male – female, and full – partial – zero scholarship athletes. Pearson correlations showed mental toughness was significantly related to lower levels of anxiety, sadness, anger, confusion, fatigue, and total mood disturbance, and higher levels of vigor.
Date:
May 2012
Creator:
Beck, Nicholas M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Reversible Electron Beam Heating for Suppression of Micro bunching Instabilities at Free-Electron Lasers
The presence of microbunching instabilities due to the compression of high-brightness electron beams at existing and future x-ray free-electron lasers (FELs) results in restrictions on the attainable lasing performance and renders beam imaging with optical transition radiation impossible. The instability can be suppressed by introducing additional energy spread, i.e., heating the electron beam, as demonstrated by the successful operation of the laser heater system at the Linac Coherent Light Source. The increased energy spread is typically tolerable for self-amplified spontaneous emission FELs but limits the effectiveness of advanced FEL schemes such as seeding. In this paper, we present a reversible electron beam heating system based on two transverse deflecting radio-frequency structures (TDSs) upstream and downstream of a magnetic bunch compressor chicane. The additional energy spread is introduced in the first TDS, which suppresses the microbunching instability, and then is eliminated in the second TDS. We show the feasibility of the microbunching gain suppression based on calculations and simulations including the effects of coherent synchrotron radiation. Acceptable electron beam and radio-frequency jitter are identified, and inherent options for diagnostics and on-line monitoring of the electron beam's longitudinal phase space are discussed.
Date:
May 30, 2012
Creator:
Behrens, Christopher; Huang, Zhirong & Xiang, Dao
Object Type:
Article
System:
The UNT Digital Library