A5102785396- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Advanced Aircraft Design and Technologies
- Underwater Acoustics Research
- Product Development and Customization
- Computational Fluid Dynamics and Aerodynamics
- Aerodynamics and Fluid Dynamics Research
- Manufacturing Process and Optimization
- Aerospace and Aviation Technology
- Fluid Dynamics and Turbulent Flows
- Design Education and Practice
- Fuel Cells and Related Materials
- Photocathodes and Microchannel Plates
- Systems Engineering Methodologies and Applications
- Ocean Waves and Remote Sensing
- Atomic and Molecular Physics
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Gas Dynamics and Kinetic Theory
- Air Traffic Management and Optimization
- Gyrotron and Vacuum Electronics Research
- Underwater Vehicles and Communication Systems
- Spacecraft and Cryogenic Technologies
- Advanced Battery Technologies Research
- Aerospace Engineering and Energy Systems
Georgia Institute of Technology
2011-2022
Sensors (United States)
2020-2022
Georgia Tech Research Institute
2019-2021
Georgia Southern University
2016
Brookhaven National Laboratory
1992-2012
Advanced Energy Systems (United States)
2010
RIKEN BNL Research Center
1993-2006
Laboratoire des Sciences de l'Ingénieur, de l'Informatique et de l'Imagerie
2000
Université de Strasbourg
1999
The previous works of Prandtl, Jones, and Klein Viswanathan addressed the problem determining lift distribution that minimizes induced drag for a given specified bending moment. In these formulations, moment is considered to be surrogate wing weight. These classical methods require constraints imposed at same coefficient which minimized. practice, however, it commonly desired minimize representative cruise while imposing limiting structural load condition, such as maneuver coefficient. This...
Aircraft with modular airframe components may offer significant flexibility in mission performance by enabling reconfiguration between sorties. This paper introduces an approach for optimizing a family of aircraft variants defined library interchangeable such as wings, tails, engines, and payloads. First, the combinatorial problemof composing into feasible assigning to missions is posed. Next, two methods are presented determine optimal reconfigurable designs. The then applied example...
A wide range of model calibration methods and formulas have been introduced in the literature for calibrating low-fidelity (LF) computer models against high-fidelity (HF) or data. Although most existing techniques assume that LF HF identical inputs, some engineering applications, example, wing aerodynamics computations, inputs to are often defined differently due different levels abstraction modeling simulation. For these problems, this paper proposes a new method calibrates mapping from by...
A half-cell superconducting rf electron gun is designed to provide 0.5 A, 2 MeV beam for the Brookhaven National Laboratory R Energy Recovery Linac. Total power of 1 MW must be delivered meet current and energy specifications, resulting in very strong coupling. Two opposing fundamental couplers (FPCs) are employed minimize transverse kick traversing structure halve through coupler. single-window coaxial coupler has been average coupling requirements. The features a planar beryllia window...
We report progress on the R&D program for electron-cooling of Relativistic Heavy Ion Collider (RHIC). This electron cooler is designed to cool 100 GeV/nucleon at storage energy using 54 MeV electrons. The source will be a superconducting RF photocathode gun. accelerator recovery linac. frequency set 703.75 MHz. maximum bunch 9.38 MHz, with charge 20 nC. has following components: photoinjector and its photocathode, linac cavity, start-to-end beam dynamics magnetized electrons, cooling...
Next generation light-sources, electron coolers, high-power FELs, Compton X-ray sources and many other accelerators were made possible by the emerging technology of high-power, high-brightness beams. In order to get anticipated performance level ampere-class currents, technological barriers are yet be broken. BNL's Collider-Accelerator Department is pursuing some these technologies for its cooling RHIC application, as well a future electron-hadron collider. We will describe work on CW,...
We present the design and parameters of an energy recovery linac (ERL) facility, which is under construction in Collider-Accelerator Department at BNL. This R&D facility has goal demonstrating CW operation ERL with average beam current range 0.1 - 1 ampere very high efficiency recovery. The possibility a future upgrade to two-pass also being considered. heart 5-cell 703.75 MHz super-conducting RF strong Higher Order Mode (HOM) damping. flexible lattice provides test-bed for exploring issues...
We present here the design and construction of an all niobium superconducting RF injector to generate high average current, brightness electron beam. A 1/2 cell cavity has been designed, built, tested. cryostat built cool /spl sim/2 K. The system can deliver up 500 W at 1.3 GHz cavity. mode-locked Nd:YVO/sub 4/ laser, operating 266 nm with 0.15 power, phase locked RF, will irradiate a laser cleaned Nb surface back wall Description critical components their status are presented in paper....
This paper demonstrates approaches to assess the performance exibility of recon gurable unmanned air vehicles consisting modular airframe components that can be interchanged between sorties. A notional family aircraft based on a xed forward fuselage and library interchangeable engines wings di erent sizes is de ned. The quanti ed for spectrum intelligence, surveillance, reconnaissance strike mission pro les using multidisciplinary analysis toolset. Performance assessed through three...
Optimal aircraft cruise performance occurs along particular trajectories traversed through Mach number and altitude space as the mission fuel mass is expended. Ideally, these optimal depend primarily on interplay between aerodynamic engine burn rate lapse of metrics with altitude. In many situations, however, ideal operating conditions are constrained by point capabilities aircraft. For example, stall may limit eciency low speed loiter operations, maximum capability reduce achievable specic...
SAS (Synthetic Aperture Sonar) imagery always contains speckle, which is often thought of as a kind multiplicative noise with respect to the underlying scene reflectivity. Speckle arises from coherent interference waves backscattered by rough surfaces within resolution cell. Numerous image processing algorithms have been proposed reduce speckle while preserving features. Frequently, these are evaluated using actual imagery; where noise-free unknown. The lack images along limited number can...
The actual image resolution achieved by synthetic aperture systems often differs from the theoretical performance, and it is advantageous to automatically measure realized of these products monitor their quality. This article describes a novel processing algorithm for measuring based on detection prominent point scatterers. proceeds in following three main steps. 1) Identify candidate scatterers via connected-component labeling dual thresholding. 2) Prune size accepted detections fitting an...
Aircraft with modular aerostructure components may o er signi cant exibility in mission performance by enabling recon guration between sorties. This paper introduces an approach for optimizing a family of aircraft variants de ned library large-scale interchangeable such as wings, tails, engines, and payloads. First, the combinatorial problem composing multiple into feasible is posed. Next, develops two methods to determine optimal gurable architectures. The optimization approaches are then...
We introduce the R&D program for electron-cooling of Relativistic Heavy Ion Collider (RHIC). This electron cooler is designed to cool 100 GeV/nucleon bunched-beam ion collider at storage energy using 54 MeV electrons. The source will be an RF photocathode gun. accelerator a superconducting recovery linac. frequency set 703.75 MHz. maximum bunch 28.15 MHz, with charge 10 nC. has following components: photoinjector, linac, start-to-end beam dynamics magnetized electrons, cooling calculations...
Superposition of spanwise lift distributions is a familiar concept from lifting-line theory. However, even for linear potential flows, superposition not rigorously applicable aerodynamic models and wing geometries in which the shape wake vortex system changes with angle attack. Nonetheless, influence these effects could generally be expected to small, insofar as downstream vortices have weaker than near field wing. In this paper, theoretical framework distribution first examined. Next,...
A common practice in wing design is to twist the airfoil sections of a speci ed planform achieve particular lift distribution at operating condition. Ideally, selected high span e ciency, acceptable stall behavior, and tailoring root bending moment, not only condition, but also or critical o -design points. One challenge this activity that shape will generally change with ight Since an aircraft must operate ectively throughout range conditions, it important understand variation its uence on...
The pumping of helium by various forms sputter-ion pumps (i.e., SIPs) is given in part I [K. M. Welch, D. J. Pate, and R. Todd, Vac. Sci. Technol. A 11, 1607 (1993)]. hydrogen diode triode SIPs herein discussed. type cathode material used these shown to have a significant impact on the effectiveness with which pumped. Examples this include data for aluminum, titanium, titanium-alloy cathodes. Diode aluminum cathodes are be no more effective than helium. use titanium anodes shielding pump...
The development of a suitable photocathode for use in high average current photoinjector at temperatures ranging from 273 K down to 2 is subject considerable interest, and active research. choice material often trade-off made based on the quantum efficiency cathode material, tolerance adverse vacuum conditions, laser wavelength needed produce photoelectrons. In this paper an overview BNL work date CsK <inf xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, a new approach is presented for calculating the incompressible flow around three-dimensional lifting body by modeling surface as vortex sheet, opposed to source and doublet distributions typical of traditional panel methods. The sheet represented triangular panels with linearly varying vorticity, resulting in second-order rate convergence respect refinement. Surface vorticity determined enforcing tangency constraints at each triangle centroid, zero circulation perimeter,...