1. Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA
2. ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
3. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, USA