1. Initial Performance Evaluation of a Gridded Radio Frequency Ion Thruster
2. Ulmen, B. "Formation and Extraction of a Dense Plasma Jet from a Helicon-Plasma-Injected Inertial Electrostatic Confinement Device," Ph.D. Dissertation, Nuclear,Plasma, and Radiological Engineering Dept.University of Illinoisat Urbana-Champaign, Champaign, IL,2013.
3. Ahern, D. "Investigation of a Space Propulsion Concept Using Inertial Electrostatic Confinement," Ph.D. Dissertation,Dept. of Aerospace Engineering, Universityof Illinois at Urbana-Champaign, Champaign, IL,2018.
4. Experimental Studies of the Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER)
5. Plasma ionization by helicon waves