A5103155212- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Advanced Surface Polishing Techniques
- Thermal Radiation and Cooling Technologies
- Magnetic confinement fusion research
- Magnetic Field Sensors Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Induction Heating and Inverter Technology
- Advanced Measurement and Metrology Techniques
- Advanced Thermoelectric Materials and Devices
- Solar and Space Plasma Dynamics
- Gyrotron and Vacuum Electronics Research
- Distributed and Parallel Computing Systems
- Integrated Circuits and Semiconductor Failure Analysis
- Single-cell and spatial transcriptomics
- Fault Detection and Control Systems
- Energy Harvesting in Wireless Networks
- Particle Detector Development and Performance
- Heat Transfer and Optimization
- Microfluidic and Bio-sensing Technologies
- Transportation Systems and Infrastructure
- Advanced materials and composites
- Space Satellite Systems and Control
- Radiation Detection and Scintillator Technologies
RadiaSoft (United States)
2016-2024
Argonne National Laboratory
2024
Babraham Institute
2024
Lawrence Berkeley National Laboratory
2020
Thomas Jefferson National Accelerator Facility
2015
QED Technologies (United States)
2007-2013
Mahle (Austria)
2010
National Institute of Standards and Technology
2007
University of Nevada, Las Vegas
2007
There are four fundamental steps to precision glass aspheric manufacturing: 1) grinding - generate the rough shape, 2) pre-polishing remove subsurface damage and smooth residuals, 3) metrology quantify surface figure errors 4) finishing reach final roughness specification. The pre-polish step is currently least deterministic process, as conventional sub-aperture tools (e.g. pitch, polyurethane pad) inherently have removal rate variation due tool misfit, pad wear, or slurry over time. This...
Optics manufactured for infrared (IR) applications are commonly produced using single point diamond turning (SPDT). SPDT can efficiently produce spherical and aspheric surfaces with microroughness figure error that is often acceptable use in this region of the spectrum. The tool marks left by process cause high surface degrade performance when used visible For multispectral precision IR applications, may also need to be improved beyond capabilities process. Magnetorheological finishing...
With the evolution of exposure tools for optical lithography towards larger numerical apertures, semiconductor industry expects continued demand improved wafer flatness at site. The allowable site 300 mm wafers is expected to be less than 45 nm by 2010 and it may as low 25 2015 according International Technology Roadmap Semiconductors (ITRS 2006). This requires with thickness variation presents a challenge both polishing metrology tools, which must capable meeting specifications. We report...
Abstract The electron lens in the Fermilab Integrable Optics Test Accelerator (IOTA) will enable new research nonlinear integrable optics, space-charge compensation, cooling, and stability of intense beams. This addresses scientific questions on high-brightness beams operational challenges high-power accelerators for nuclear particle physics. We review roles that lenses play this field physical principles behind their applications. design criteria specifications IOTA storage ring are then...
Shaped emitters are of interest to a broad range applications in vacuum electronic devices. In particular, thermionic energy converters (TECs) take advantage shaped increase the local surface field, thereby extracting more current for given cathode temperature and applied voltage. However, modeling these devices is challenging; Warp [J.-L. Vay, D. P. Grote, R. H. Cohen, A. Friedman, Comput. Sci. Discov. 5, 014019 (2012)] fully 3D particle-in-cell code capable handling wide physics problems...
Abstract Radia 3D magnetostatics code has been used for the design of insertion devices light sources over more than two decades. The uses magnetization integral approach that is efficient solving permanent magnet and hybrid structures. initial version was sequential, its core written in C++ interface Mathematica language. This paper describes a new Python interfaced parallel applications. parallelization implemented on level, where semi-analytical calculations interaction matrix elements...
New optical designs containing freeform optics have recently begun appearing in systems. Applications incorporated parts ranging size from small (e.g.: ~5 – 10 mm rectangles) to large astronomical applications). To meet these needs, QED Technologies introduced two solutions using its Q22-Y and Q22-950F platforms. Magnetorheological Finishing® (MRF®) is a production proven technology for deterministically finishing symmetric (flats, spheres, on-axis aspheres) rotational toolpath, rectangular...
Many present and future accelerators must operate with high intensity beams when distortions induced by space charge forces are among major limiting factors. Betatron tune depression of above approximately 0.1 per cell leads to significant linear optics. aspects machine operation depend on proper relations between lattice functions phase advances, can be improved treatment effects. We implement an adaptive algorithm for re matching full account in the approximation case Fermilab's IOTA ring....
The wiggler-based amplifier of the microbunching instability in electron beam is considered and compared to a longitudinal space charge consisting drifts chicanes. gain magnitude seed perturbation density evaluated analytically as function period perturbation, parameters, wiggler lattice parameters. theory with results numerical calculations based on simulations transport through lattice. Published by American Physical Society 2024
ABSTRACT Although spectral flow cytometry has become a ubiquitous tool for cell analysis, the use of on sorters requires additional considerations arising from unique requirements sorting workflows. Here, we show that care should be taken when ascertaining purity sort sorter, as mismatch buffers used initial sample suspension and collection can affect unmixing data, potentially giving rise to erroneous check results.
Careful characterization of the removal function sub-aperture polishing tools is critical for optimum results. Magnetorheological finishing (MRF®) creates a tool, or "spot", that unique both its locally high rate and slope content. For variety reasons, which will be discussed, longer duration spots are beneficial to improving MRF performance, but yield higher slopes rendering them difficult measure with adequate fidelity. QED's Interferometer Stitching (QIS™) was designed content inherent...
Machine learning (ML) has the potential for significant impact on modeling, operation, and control of particle accelerators due to its ability model nonlinear behavior, interpolate complicated surfaces, adapt system changes over time. Anomaly detection in particular been highlighted as an area where ML can significantly operation accelerators. These algorithms work by identifying subtle behaviors key variables prior negative events. Efforts apply anomaly have largely focused subsystems such...
Abstract Radia is a 3D magnetostatics code that widely used to model range of magnets for particle accelerators, with particularly broad usage within the synchrotron light source community. Recently, has been released as open and made available collaborative development on GitHub. A US DOE SBIR grant obtained its upgrade extension. The ongoing improvements are focused core physics engine, performance enhancements, graphical user interface. Additionally, new Python API (PyRadia) developed...
Thermionic energy converters (TEC) are an attractive technology for modular, efficient transfer of heat to electric energy. TECs comprised narrowly-separated plates held at specified voltages. emission the cathode releases electrons which travel anode, producing a current may generate electrical power. Simple structures often space-charge limited, because operating temperatures produce currents exceeding corresponding Child- Langmuir limit device. The steady-state dynamics TEC depend on...
The spherical primary optical telescope (SPOT) project is an internal research and development program at NASA Goddard Space Flight Center. goals of the are to develop a robust cost effective way manufacture mirror segments demonstrate new wavefront sensing approach for continuous phasing across segmented primary. This paper focuses on fabrication segments. Significant savings were achieved through design, since it allowed be cast rather than machined from glass blank. Casting was followed...
The Linac Extension Area (LEA) is a new beamline planned as an extension of Argonne's APS linac. An S-band 1.6-cell copper photo-cathode (PC) RF gun has been installed and commissioned at the linac front end. PC will provide beam to LEA for accelerator technology development physics experiments, in interleaving with thermionic which provides storage ring operations. Recently experiment was proposed demonstrate TESSA high-efficiency concept LEA. In support this experiment, we have begun...