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Research

Research Interests

  • Complex Plasma Discs
  • Supersonic Dust particles
  • Langmuir Waves

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Introduction
Plasma is an ionized gas often referred to as the fourth state of matter. It has been estimated that over 99% of the matter in the universe is in the plasma state. Common examples of plasmas include: lightning, neon signs, the Northern Lights, the sun, and the stars.

 

Research
The best way to explore the universe is through physics research. Over the past several years students, faculty and I have worked on a number of plasma physics research projects exploring the various properties of Langmuir bursts, double layer generated plasma arcing, and properties of dusty plasma disks. Students and I have presented this research at a number of conferences at the local, national, and even international levels. Student Research can be found on our SPS page.

 

Recent Conferences and Publications:

W. L. Theisen, N. R.Weiner " Plasma Sheath dependence on Power to the Electrode", Ohio Region-APS Meeting, Youngstown State University, OH April 2014

W. L. Theisen, T. E. Sheridan" Sub-Fickean Diffusion in a One-Dimensional Plasma Ring", American Geophysical Union National Meeting, San Francisco, CA December 2013

W. L. Theisen, T. E. Sheridan, "Acoustic Waves in Two-ring Dusty Plasmas", the 13 th Workshop on the Physics of Dusty Plasmas, Waco, TX, May 20-23, 2012.

W.L. Theisen and T.E. Sheridan, " Longitudinal Waves in Strongly Coupled Two-ring Dust Chains , OS-APS Meeting, Ohio State University, Columbus, OH. May 2012.

W. L. Theisen and T. E. Sheridan, "Speed Distribution Characteristics of Supersonic Dust Particles in Dusty Plasmas", American Geophysical Union National Meeting, San Francisco, CA. December 2010.

W. L. Theisen, D. J. Pleshinger, and T. E. Sheridan, "Characterization of Single File Diffusion in One-Dimensional Dusty Plasma", Division of Plasma Physics National Meeting, Chicago, IL. November 2010.

T. E. Sheridan and W. L. Theisen, "Transition to Chaos in a Driven Dusty Plasma", Physics of Plasmas 17, 013703-1-6 (2010).

W.L. Theisen and T.E. Sheridan, "Experimental Study of the Nonlinear Dynamics for a Three Particle Dusty Plasma”, Twelfth Workshop on the Physics of Dusty Plasmas WPDP, Boulder, CO, May 2009.

W.L. Theisen and T.E. Sheridan, "Observation of Quasi-periodic Route to Chaos in Driven Dusty Plasma, The Ohio-Section of the American Physical Society Meeting, Wright State University, Dayton, OH. October 2008.

The Ohio-Section of the American Physical Society Meeting, Youngstown State University, Youngstown OH. "Transition to Chaos in a Complex Plasma”, W.L. Theisen, T.E. Sheridan. April 2008.

W.L. Theisen and C. Koontz, “Supersonic Dust Particles in a Complex Plasma, The Ohio-Section of the American Physical Society Meeting, Eastern Michigan University, Ypsilanti, MI. May 2007.

T.E. Sheridan and W.L. Theisen, "Study of two-dimensional Debye clusters using Brownian motion", Physics of Plasmas 13, 062110 (2006).

W.L. Theisen, "Electrical Discharge Arcing Generated by an Anode Double Layer" American Geophysical Union National Meeting, San Francisco, CA, December 2005.

W.L. Theisen and T.E. Sheridan, "Charge and Debye Length Measurements in Two-Dimensional Clusters using Thermal Fluctuations", American Physical Society Meeting, Cleveland State University, Fall 2005.

T.E. Sheridan, W.L. Theisen, C.R. Buckey, D.J. Cox, R.J. Merrill, ‘Breathing Mode Resonance of a Complex Disk’, Physics Letters A (329). July 2004.

T.E. Sheridan, W.L. Theisen, C.R. Buckey, D.J. Cox, R.J. Merrill, "Breathing Mode Resonance of a Complex Disk", European Physical Society Conference on Plasma Physics, London, U.K. 2004.

W. L. Theisen and Paul Pfieffer, "Plasma Arcing Generated by an Anode Double Layer", Ohio Section of the American Physical Society Conference, Case Western Reserve, 2003.

W. L. Theisen and R. T. Carpenter, 'Time Series Analysis of Langmuir Bursts'. IEEE Transactions on Plasma Science, 28 (2). April 2000.