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Dan T. Abell Senior Research Scientist
Principal Research Scientist
Dan T. Abell received his BA in physics from Swarthmore College in 1982 and his PhD from the University of Maryland at College Park in 1995. Dan is an expert on Hamiltonian methods and symplectic maps, especially with application to beam dynamics in particle accelerators. Early in his career, he developed the codes CREMONA and CTRACK to perform map symplectification and fast symplectic tracking. These codes were later used for tracking studies of the Large Hadron Collider (LHC). Dan helped to design the Spallation Neutron Source, considering the effect of magnet fringe fields on tune spread, the use of octupole magnets to shape the tune footprint, and particle tracking through the injection magnet to explore dumping of stripped electrons. Dan developed a technique for computing generalized gradients for RF cavity fields, used to compute high-order maps. He has worked extensively with the Polymorphic Tracking Code (PTC) and with GPUSPINTRACK, a GPU-accelerated code for fast and accurate tracking and analysis of spin-orbit motion in particle accelerators. Dan has also worked on the development and implementation of symplectic algorithms for the efficient simulation of RF cavity beam loading in the presence of multiple high-order modes. Most recently, he has worked on improvements to the accelerator ray-tracing code Zgoubi, and on the magnet design code Radia.
David Bruhwiler has devoted over 25 years to the simulation of experiments and physical systems, including beam and laser-driven plasma accelerators, electron cooling of relativistic heavy ion beams, electron and ion sources, particle tracking and accelerator design and nonlinear dynamical systems. In addition to codeveloping both free and commercial software, and coauthoring more than 30 refereed journal articles, David has managed more than $10M in contracts and grants, and successfully mentored teams of more than 10 scientists, mathematicians and software developers. David is a Fellow of the American Physical Society.
Evan Carlin received a BS in computer science from the University of Puget Sound. After graduation he worked as a consultant on a variety of software projects ranging from a cloud migration for a Fortune 500 bank to building a web app for a streaming TV Service. He then went to work for Google where he focused on customer support data analysis and new tool development.
Stephen Coleman Research Scientist
Stephen Coleman is a research scientist with experience in neutrino physics at Fermilab and J-PARC in Tokai, Japan. He studied physics at the University of Colorado, and received his PhD from the College of William and Mary, working on muon neutrino oscillations in a muon neutrino beam. He also worked for several years in a biology laboratory on a DARPA-funded research project, studying the dynamics of proteins responding to chemical stimulus.
Nathan Cook Research Scientist Group Leader
Research Scientist Nathan Cook is an accelerator physicist with a strong background in a variety of topics, ranging from advanced accelerator concepts to intense beam dynamics to thermionic energy converters. He has published peer-reviewed papers on the subjects of laser driven ion acceleration, RF acceleration, novel algorithms for electrostatic and electromagnetic systems, thermionic emission, ion beam imaging diagnostics, and was an editor of the Pre-Conceptual Design Report for the Ion Rapid Cycling Medical Synchrotron project at Brookhaven National Laboratory. Nathan received his BA in physics and mathematics from Williams College and his PhD in physics from Stony Brook University. His thesis work comprised novel approaches to RF acceleration of carbon ions for a rapid cycling medical synchrotron and laser driven shock acceleration of helium ions from a gas target.
Rebecca “Beck” Cotter is our research administrator. She brings over 10 years of experience in pre-award management and proposal development from both a small business and government program perspective. She has worked extensively with the DOE, NASA, and the USAF to secure funding for earth science and climate related projects. Beck holds a bachelor’s degree in kinesiology from the University of Houston.
Joan Danver Operations Manager
Operations Manager Joan Danver comes to RadiaSoft with a background in project management in a small business setting. She has experience managing government contracted projects requiring extensive filings and oversight. Joan received her BA in biology from Williams College and her MS in biochemistry and cell biology from Stony Brook University, where she investigated the role of microglia in the brain.
Jonathan Edelen Research Scientist Group Leader
Jonathan Edelen is an accelerator physicist with a broad range of experience across the field. He specializes in thermionic cathode guns and space-charge effects in low energy electron beams. Jon earned a PhD in accelerator physics from Colorado State University. After completing his PhD, Jon was selected for the prestigious Bardeen Fellowship at Fermilab. While at Fermilab he worked on RF systems for the PIP-II Injector Test, beam dynamics and RF transient effects in the proposed PIP-II accelerator, and thermionic cathode RF guns at the Advanced Photon Source. Currently, Jon is focused on building advanced control algorithms for particle accelerators including solutions involving machine learning. He is also developing improved simulation tools for studying field enhanced thermionic emission in thermionic energy converters. Jonathan has published papers and presented at international conferences on a variety of topics in accelerators.
Associate Research Scientist Callie Federer received her BS cum laude in computer science from Truman State University and her PhD in computational bioscience from the University of Colorado Anschutz Medical Campus. Her thesis work, Putting More ‘Neural’ in Artificial Neural Networks, focused on the intersection of neuroscience and artificial intelligence—how we can use the brain to build better machine learning algorithms, and how can we use machine learning algorithms to better understand the brain? She was awarded the National Science Foundation (NSF) Graduate Research Fellowship in 2017 which is awarded to 16% of applications who have demonstrated the potential to be high achieving scientists and engineers early in careers.
Chris Hall Research Scientist
Research Scientist Chris Hall is an expert in the simulation and analysis of collective beam effects in energy recovery linac (ERL) driven free-electron lasers (FEL), with an emphasis on coherent synchrotron radiation (CSR) effects. He developed techniques to mitigate the negative impact of CSR on the electron beam, based on analysis of experimental data from the Jefferson Laboratory ERL driven FEL. Chris received a BS in physics and mathematics from Hope College, his MS in physics from Michigan State University, and his PhD in electrical engineering from Colorado State University in 2016.
Senior Software Developer Mike Keilman received his BS cum laude in physics from Oberlin College and his PhD in nuclear physics at the University of Colorado. His thesis experiment, measurement of pion single charge exchange on Deuterium, ran at the Los Alamos Meson Physics Facility using the Neutral Meson Spectrometer. He analyzed the data with tools ranging from Fortran to shell scripting to an obscure language called “HTML.” Thus armed, he shifted to software development in the far-flung realms of herbal medicine and telecommunications, most recently hand-crafting a variety of iOS apps. At RadiaSoft, he builds and maintains web UIs based on the Sirepo framework, supporting back-end software for X-ray optics, particle accelerators, and other applications.
Product Manager Paula Messamer is an experienced research and design professional with extensive industry experience in new product development. Paula holds a PhD in speech, language, and hearing sciences from the University of Colorado and is on the Board of Directors of “Brain Buddy”—a local non-profit serving people with aphasia.
Paul Moeller Principal Software Developer
Principal Software Developer Paul Moeller has developed real-world solutions in a variety of problem domains including finance, graphics, medical billing, and generic user interfaces. Paul holds a BS in computer science from Clarke University and an MS in computer science from Loyola University.
CTO Rob Nagler has designed and deployed leading-edge distributed systems for almost 40 years. Rob has written extensively about software, including his book on agile development methods, Extreme Perl. Rob started his career in the Distributed Systems Group at Stanford working with Dr. David Cheriton. At Sun Microsystems, he worked with Eric Schmidt in the software products division. He led OLAP development at Olsen & Associates, a pioneer in financial research and analysis. At Tandem Computers High Performance Research Center, Rob implemented a multi-platform, distributed architecture based on CORBA and used for internet traffic routing for mobile phone networks. Rob holds a BS in computer engineering from the University of California, San Diego, and an MS in computer engineering from Stanford University.
Research Scientist Boaz Nash is an accelerator physicist with an expertise in synchrotron light sources. Boaz studied math and physics at Reed College, and received his PhD from Stanford University in physics, studying beam dynamics of electron storage rings. He did his first postdoc at Brookhaven National Lab, working on dynamic aperture and Touschek lifetime calculation and optimization for NSLS-II. Starting in 2009, he worked at the European Synchrotron Radiation Facility in Grenoble, France, on existing ESRF, and design for the upgrade EBS machine. He is particularly interested in bridging the gap between the electron beam dynamics and experiments in the synchrotron light sources worldwide.
Senior Research Scientist Ilya Pogorelov is a computational accelerator physicist with over 15 years of experience in the development of scientific software and high-fidelity simulation. He has worked on a number of projects in the areas of relativistic electron cooling, polarized beam transport, free-electron lasers, collective effects in beams, high-order modes in RF structures, non-equilibrium statistical physics, and nonlinear dynamical systems. Ilya’s work has been published in peer-reviewed journals and numerous conference proceedings, and he has been the PI for several DOE SBIR and internal R&D projects.
Scientific Technical Writer Emily “Remy” Poore has seven years’ writing and editing experience, during which she’s worked as a science journalist at Sky & Telescope reporting on space missions and astronomical phenomena; a book editor at Harvard for biographical nonfiction; and a content marketer for Australian startup Propeller Aero. She holds a BA magna cum laude in physics and English literature from University of Redlands and MA in publishing and writing from Emerson College.
Leslie W. Rosczyk Accounting and HR Specialist
Leslie W. Rosczyk is RadiaSoft’s accounting and HR specialist. Leslie has extensive experience with government accounting, contract negotiations, and closeouts as well as proposal submissions and human resource administration. Leslie holds a bachelor’s degree from the University of Wisconsin, Madison.
Xi Tan Associate Research Scientist
Xi Tan is an associate research scientist at RadiaSoft. Her research interests are computational plasma physics, plasm-boundary interactions, vacuum nanoelectronics, etc. Now she is working on high-performance PIC simulation for designing energy-efficient TECs (thermionic emission converters). Xi received her PhD in mechanical engineering from the University of Notre Dame, and her thesis work focuses on field emission-driven microdischarges. She also holds a BS and multiple MS degrees in the field of energy engineering.
Stephen Webb Senior Research Scientist Associate Group Leader
Senior Research Scientist Stephen Webb is an expert in scientific computing and theoretical plasma and beam physics, with an eye towards the theoretical underpinnings of computational algorithms. He has co-authored over 20 conference proceedings and peer-reviewed journal articles covering the fields of intense ion beams, free-electron lasers, and computational plasma and beam physics. Stephen holds a BS in physics from Georgia Tech and a PhD in accelerator physics from Stony Brook University. In 2015, the Air Force Office of Scientific Research awarded Stephen one of its prestigious Young Investigator Research Program awards. His project, “High average power electron beams from a novel compact plasma wakefield accelerator,” developed fundamentally new algorithms and computational tools to enable the accurate simulation of novel ultra-bright electron beams for a wide variety of scientific, industrial, and military applications.