A5076471800- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Laser-Matter Interactions and Applications
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Photocathodes and Microchannel Plates
- Electromagnetic Simulation and Numerical Methods
- Photonic and Optical Devices
- Advancements in Photolithography Techniques
- Particle Detector Development and Performance
- Viral Infectious Diseases and Gene Expression in Insects
- Antenna Design and Analysis
- Scientific Computing and Data Management
- Advanced Multi-Objective Optimization Algorithms
- Superconducting Materials and Applications
- Non-Destructive Testing Techniques
- Electron and X-Ray Spectroscopy Techniques
- Energy Harvesting in Wireless Networks
- Reservoir Engineering and Simulation Methods
- Advanced Antenna and Metasurface Technologies
- Machine Learning and Data Classification
- Advanced Electron Microscopy Techniques and Applications
- bioluminescence and chemiluminescence research
- Advanced Fluorescence Microscopy Techniques
Stanford University
2022-2024
SLAC National Accelerator Laboratory
2020-2024
Illinois Institute of Technology
2017-2019
Argonne National Laboratory
2013-2018
IIT Research Institute
2018
University of Houston
2013
High-fidelity physics simulations are powerful tools in the design and optimization of charged particle accelerators. However, computational burden these often limits their use practice for experiment planning. It also precludes as on-line models tied directly to accelerator operation. We introduce an approach based on machine learning create nonlinear, fast-executing surrogate that informed by a sparse sampling simulation. The $\mathcal{O}({10}^{6})--\mathcal{O}({10}^{7})$ times more...
This article reviews the development of some novel low-profile antennas for CubeSats. The integrated were developed using microstrip-antenna technology, and designed to be low profile while having minimal (or zero) blockage solar panels on CubeSat. Two types designs investigated: 1) transparent antennas, which are placed above (supersolar) 2) nontransparent below (subsolar). For past: metal a wire mesh design. indium tin oxide has comparatively high sheet impedance, makes an antenna design...
A long-sought-after goal for photocathode electron sources has been to improve performance by temporally shaping the incident excitation laser pulse. The narrow bandwidth, short wavelength, and picosecond pulse duration make it challenging employ conventional spectral techniques. We present a novel efficient intensity-envelope technique achieved during nonlinear upconversion through opposite-chirp sum-frequency mixing. also numerical case study of linac coherent light source-II photoinjector...
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Simple antennas such as wire whips are commonly used on CubeSats because they do not obstruct the solar panels. These mechanically deployed and prone to failure. This paper offers several antenna solutions that address challenges associated with launching standards need for Each design aims fit onto a face of 3-unit (3U) CubeSat. The frequencies 2.4 GHz 434 MHz ground communication, 1.616 communication Iridium satellite constellation, 900 between CubeSats. Based simulation results, three...
Many sophisticated computer models have been developed to understand the behaviour of particle accelerators. Even these complex often do not describe measured data. Interactions beam with external fields, other particles in same and walls all present modelling challenges. These can be challenging model correctly even modern supercomputers. This paper describes OPAL (Object Oriented Parallel Accelerator Library), a parallel open source tool for charged-particle optics linear accelerators...
Particle accelerators are invaluable tools for research in the basic and applied sciences, such as materials science, chemistry, biosciences, particle physics, nuclear physics medicine. The design, commissioning, operation of accelerator facilities is a nontrivial task, due to large number control parameters complex interplay several conflicting design goals. Argonne Wakefield Accelerator facility has some unique challenges resulting from its purpose carry out advanced R Individual...
This paper presents a comprehensive technical overview of the Linac Coherent Light Source II (LCLS-II) photoinjector laser system, its first and foremost component. The LCLS-II system serves as an upgrade to original LCLS at SLAC National Accelerator Laboratory. advanced generates high-quality beams for LCLS-II, contributing instrument's unprecedented brightness, precision, flexibility. Our discussion extends various subsystems that comprise photoinjector, including photocathode laser,...
Machine learning (ML) models of accelerator systems ('surrogate models') are able to provide fast, accurate predictions physics phenomena. However, approaches date typically do not include measured input diagnostics, such as the initial beam distributions, which critical for accurately representing evolution through system. In addition, these inputs often vary over time, and that can account changing conditions needed. As time measurements is limited, simulations in some cases needed...
VTMOP is a Fortran 2008 software package containing two modules for solving computationally expensive bound-constrained blackbox multiobjective optimization problems. implements the algorithm of [ 32 ], which handles or more objectives, does not require any derivatives, and produces well-distributed points over Pareto front. The first module contains general framework problems by combining response surface methodology, trust region an adaptive weighting scheme. second features driver...
Photoinjectors and Free Electron Lasers (FEL) are amongst the most advanced systems in accelerator physics have consistently pushed boundaries of emittance x-ray peak power. In this paper, laser shaping at cathode is proposed to further lower reduce electron beam tails, which would result brighter production. Using dispersion controlled nonlinear (DCNS), pulses dynamics were simulated LCLS-II. The photoinjector was optimized resulting e-beam profiles then linac. Finally, expected FEL...
We present a novel, versatile framework to generate W-level temporally shaped UV picosecond pulses via non-colinear sum frequency generation and demonstrate it producing flattop, high-power capable of enhancing femtosecond- attosecond-level X-ray free electron lasers.
Model-based, derivative-free, trust-region algorithms are increasingly popular for optimizing computationally expensive numerical simulations. A strength of such methods is their efficient use function evaluations. In this paper, we one algorithm to optimize the beam dynamics in two cases interest at Argonne Wakefield Accelerator (AWA) facility. First, minimize emittance a 1 nC electron bunch produced by AWA rf photocathode gun adjusting three parameters: phase, solenoid strength, and laser...
Particle accelerators are invaluable tools for research in the basic and applied sciences, fields such as materials science, chemistry, biosciences, particle physics, nuclear physics medicine. The design, commissioning, operation of accelerator facilities is a non-trivial task, due to large number control parameters complex interplay several conflicting design goals. We propose tackle this problem by means multi-objective optimization algorithms which also facilitate parallel deployment. In...
The Two-Beam Acceleration (TBA) is a modified approach to the structure-based wakefield acceleration which may meet luminosity, efficiency, and cost requirement of future linear collider. Recently, various TBA experiments have been carried out at Argonne Wakefield Accelerator Facility (AWA). With X-band metallic power extractors accelerators, 70 MeV/m average accelerating gradient has demonstrated in two stages while 150 as well 300 MW extracted achieved single stage. In addition, low K-band...
We present a thorough description of the LCLS-II photoinjector laser system, an instrument underpinning ultrafast X-ray sciences. Our presentation will highlight key components and advancements in generating high-quality, high-energy, ultrashort pulses Free Electron Lasers.
Machine learning models of accelerator systems (`surrogate models') are able to provide fast, accurate predictions physics phenomena. However, approaches date typically do not include measured input diagnostics, such as the initial beam distributions, which critical for accurately representing evolution through system. In addition, these inputs often vary over time, and that can account changing conditions needed. Simulations in some cases needed sufficient training data. These represent...