Physics

Dr. Roberson received his Ph.D. in Earth and Space Sciences at the University of Washington, researching innovative methods of in-space plasma propulsion. His background in plasma physics includes the common methods of electric propulsion and the natural plasma environment surrounding Earth and the other planets.

He has worked with both undergraduate and graduate students on various projects, including advanced propulsion systems for potential space applications, payloads for high-altitude balloon flights, flight and communications systems for rockets, and vacuum systems to simulate space-like environments.

As part of the Department of Physics at DigiPen, Dr. Roberson leads courses introducing fundamental principles involving forces and motion, energy and momentum, electricity and magnetism, circuits and electronics, light and optics, and other areas of natural science, as well their applications. He also instructs students in more advanced topics such as sound waves and acoustics.

Dr. Erik Mohrmann studied psychology and physics at Rensselaer Polytechnic Institute in Troy, NY. He then moved to Seattle and earned his doctorate in physics at the University of Washington. He thoroughly enjoyed teaching at both institutions and has continued his teaching career at DigiPen Institute of Technology.

Mohrmann’s academic interests include learning models, the biological basis of behavior, nuclear astrophysics, and computational physics simulation, with most of his research in the latter two areas. His current research interests include stellar nuclear reactions and the modeling of deformable bodies.

Professor Mohrmann believes it is of critical importance to make topics pertinent, comprehensible, and interesting to each specific audience, because physicists, engineers, and artists all approach topics from different angles. His research helps him relate classroom physics to the world we all experience every day, and provides guidance to undergraduates and graduates who are researching topics in simulation.

Selected Publications 

• Mohrmann, E. C., et al, “The 7Be(p,γ)8B Astrophysical S-Factor,” Nuclear Physics A 758 (2005): 685-688.
• Mohrmann, E. C., et al, “New Determination of the 7Be(p,γ)8B S-Factor,” Nuclear Physics A 746 (2004): 210-214.
• Mohrmann, E. C., et al, “Precise Measurement of the 7Be(p,γ)8B S-Factor.” Physical Review C 68, no. 6 (2003): 065803.
• Mohrmann, E. C., et al, “A New Measurement of 7Be(p,γ)8B Cross Section and Its Astrophysical Meaning.” Nuclear Physics A 718 (2003): 113-116.
• Mohrmann, E. C., et al, “7Be(p,γ)8B Astrophysical S Factor from Precision Cross Section Measurements.” Physical Review Letters 88, no. 4 (2002): 041101.
• Mohrmann, E. C., et al, “The Fabrication of Metallic 7Be Targets with a Small Diameter for 7Be(p,γ)8B Measurements.” Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 187, no. 2 (2002): 264-274.
• Mohrmann, E. C., et al, “A New Determination of the Astrophysical S-Factor for the 7Be(p,γ)8B Reaction from Direct Cross Section Measurements.” AIP Conference Proceedings 610, no. 1 (April 2, 2002): 461-465.

Charles Duba earned a BS in Physics from UC San Diego, and an MS and Ph.D. in Physics from the University of Washington at the Center for Experimental Nuclear Physics and Astrophysics. His dissertation project was on electronics for the Sudbury Neutrino Observatory, where he helped prove the solution to the long-standing “Solar Neutrino Problem.” (See “Solving the Mystery of the Missing Neutrinos.”) He continues to work on neutrino detection experiments, currently with HALO, a long-term supernova neutrino detector at the SNO lab in Sudbury.

Dr. Duba’s research interests are in weak-interaction physics, physics instrumentation, physics simulation, augmented reality, and hardware design.

Selected Publications

• Duba, C. A., Duncan F., Farine J., Habig A., Hime A., Robertson R. G. H., Scholberg K., Shantz T., Virtue C. J., Wilkerson J. F., Yen S., “HALO -The Helium and Lead Observatory for Supernova Neutrinos,” Journal of Physics, Conference Series, Volume 136 (2008).
• Duba, C. A.,”Electronics for the Neutral Current Detection Array at the Sudbury Neutrino Observatory,” Ph.D. Dissertation, University of Washington, 277 pp (2006).
• Duba, C. A., et al, T. D., “Sudbury Neutrino Observatory Neutral Current Detectors Signal Readout System,” IEEE Transactions on Nuclear Science, v 51, n 5, pp 2227-30 (2004).
• Duba, C. A., et al, “Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory,” Physical Review Letters, Volume 89, Issue 1; 746 citations (2002).
• Duba, C. A., et al, “Measurement of the Rate of ne + d -> p + p + e- Interactions Produced by 8B Solar Neutrinos at the Sudbury Neutrino Observatory,” Physical Review Letters, Volume 87, Issue 7; 831 citations (2001).
• Duba, C. A., et al, “Low Background 3He Proportional Counter for Use in the Sudbury Neutrino Observatory,” IEEE Transactions on Nuclear Science, Volume 46, Issue 4 (1999).
• Duba, C., et al, “Solar Fusion Cross Sections,” Reviews of Modern Physics, Volume 70, Issue 4; 437 citations (1998).

Anand Thirumalai earned his bachelor’s degree in materials engineering from the Indian Institute of Technology (IIT) in Roorkee, India. He then went on to earn a master’s degree in materials engineering from the University of British Columbia (UBC). For his master’s thesis he worked on designing and characterizing new-generation turbine blade materials, made of nickel-based superalloys.

After getting his master’s degree, he switched fields completely to follow his passion and scientific curiosity — astrophysics. For his second master’s degree at UBC, this time in astrophysics, he worked on studying the strongest magnetic fields in the known universe — those found in neutron stars — and computing the structure of atoms in such field strengths.

Later, his Ph.D. work looked at the end stages of stellar evolution. He developed a novel stellar wind model combining magnetohydrodynamics with particulate dust-dynamics and stellar rotation. His wind model is applicable to a range of stellar masses and stellar sub-types and presents a route for solving the so-called missing mass-loss mechanism problem in certain types of evolved stars.

Before coming to DigiPen, Dr. Thirumalai was also a School of Earth and Space Exploration Postdoctoral Fellow at Arizona State University. His research there involved studying winds of evolved stars as well as research in computational atomic structure. He has developed some of the fastest and most accurate atomic structure software for atoms in strong magnetic fields. He continues this research work in collaboration with researchers at UBC in Vancouver, as well as with researchers at the University of Oslo in Norway. His research these days focuses on making headway in the almost completely uncharted field of atomic and molecular structure in strong magnetic fields, as well simulations of star and planet formation. A large part of his current research focus involves harnessing the immense computing power of GPUs in astrophysical simulations.

Dr. Thirumalai teaches at all levels of the physics curriculum at DigiPen and believes in promoting diversity and inclusivity in the classroom, placing an emphasis on both teamwork as well as an interdisciplinary approach for solving modern problems using modern methods of solution.

Research website

Selected Publications

• Thirumalai, A., Desch, S. J., and Young, P., “Carbon atom in intense magnetic fields,”. Physical Review A, 90, 052501 (2014).
• Anand Thirumalai and Jeremy S. Heyl, “Energy levels of light atoms in strong magnetic fields,” Invited review article in Advances in Atomic, Molecular and Optical Physics, Vol. 63, Chapter 5, p. 323 (2014).
• Anand Thirumalai and Jeremy S. Heyl, “Two-dimensional pseudospectral Hartree-Fock method for low-Z atoms in intense magnetic fields,” Physical Review A, 89, 052522 (2014).
• Anand Thirumalai and Jeremy S. Heyl, “Is Mira a magneto-dusty rotator?” Monthly Notices of the Royal Astronomical Society, Vol. 430, p. 1359 (2013).
• Anand Thirumalai and Jeremy S. Heyl, “The magnetised bellows of Betelgeuse,” Monthly Notices of the Royal Astronomical Society, Vol. 422, p. 1272 (2012).
• Anand Thirumalai and Jeremy S. Heyl, “A hybrid steady-state magnetohydrodynamic dust-driven stellar wind model for AGB stars,” Monthly Notices of the Royal Astronomical Society, Volume 409, p. 1669 (2010).
• Anand Thirumalai and Jeremy S. Heyl, “Hydrogen and helium atoms in strong magnetic fields,” Physical Review A, vol. 79, 012514 (2009).