Scientists & Staff

David T. Anderson

Position title: Principal Investigator, Founder

Email: dtanders@wisc.edu

David Anderson is the Jim and Anne Sorden Professor of Electrical and Computer Engineering and the Principal Investigator for the HSX Program. He has been associated with HSX since its initial design activities in 1990, and teaches in the areas of electrodynamics and plasma physics.

Joseph N. Talmadge

Position title: Scientist, Founder

Email: talmadge@wisc.edu

Benedikt Geiger

Position title: Professor

Email: benedikt.geiger@wisc.edu

Benedikt Geiger started his career at UW-Madison in February 2019 and is involved in the physics exploitation of the HSX stellarator experiment. His research interests are the experimental investigation of turbulent particle and heat transport with the aim to develop new turbulence-optimized stellarator experiments. He teaches in the field of nuclear engineering and plasma physics.

Chris Hegna

Position title: Professor

Email: cchegna@wisc.edu

Konstantin Likin

Position title: Scientist

Email: kmlikin@wisc.edu

Santhosh Kumar

Position title: Scientist

Email: stkumar@wisc.edu

Santhosh received his PhD in Physics from the Australian National University in 2008. After receiving his PhD, he came to UW-Madison as a Research Associate in the Department of Physics. Since joining HSX in 2012, Santhosh has been involved with researching experimental plasma physics, flows and electric fields, neoclassical modeling of stellarators, impurity transport, plasma spectroscopy, and diagnostic development.

Aaron Bader

Position title: Scientist

Email: abader@engr.wisc.edu

Aaron received his PhD from MIT in 2011.  Since joining HSX in 2012, Aaron has been involved in computational research of interest to stellarators. His topics of interest include, edge plasma physics, coil design, energetic particle confinement and stellarator optimization.

Benjamin Faber

Position title: Scientist

Email: bfaber@wisc.edu

Benjamin holds a PhD in Physics for the University of Wisconsin-Madison and is an expert on turbulence in stellarator devices. A computational physicist by training, he currently holds a staff scientist position in the Department of Engineering Physics at UW-Madison working on building new tools and infrastructure for stellarator optimization, with a focus on turbulent optimization.

Kyle Roethle

Position title: Mechanical Instrumentation Specialist

Email: kroethle@wisc.edu

Ben Knowles

Position title: Instrumentation Technologist

Email: bdknowles@wisc.edu

Ben Knowles received his MS in Astrophysics from the University of Colorado at Boulder in 2001, and was the ISS Calibration Engineer for the Cassini Mission during its tour of Saturn. He has also worked in private industry as a Software and Controls Engineer, focusing on automation and scientific instrumentation. He moved to the HSX team in August of 2021, where he develops and maintains the HSX computer and data acquisition network.

Rex Wagner

Position title: Operations Director

Email: rex.wagner@wisc.edu

Rex comes to HSX with 20+ years of engineering experience in aerospace, automotive, and nuclear industries.