Transition in electron transport in a cylindrical Hall thruster

Parker, J. B.; Raitses, Y.; Fisch, N. J.
August 2010
Applied Physics Letters;8/30/2010, Vol. 97 Issue 9, p091501
Academic Journal
Through the use of high-speed camera and Langmuir probe measurements in a cylindrical Hall thruster, we report the discovery of a rotating spoke of increased plasma density and light emission which correlates with increased electron transport across the magnetic field. As cathode electron emission is increased, a sharp transition occurs where the spoke disappears and electron transport decreases. This suggests that a significant fraction of the electron current might be directed through the spoke.


Related Articles

  • Probes for high-frequency measurements in a plasma gun. Hurtig, Tomas; Wistedt, Jan // Review of Scientific Instruments;Feb2003, Vol. 74 Issue 2, p1153 

    High-frequency correlation measurements of plasma density, and electric and magnetic fields in a plasma gun have been performed. In this article, we give a description of the probes developed for this purpose. The probes described are characterized by a large bandwidth (> 15 MHz) and very low...

  • Effects of enhanced cathode electron emission on Hall thruster operation. Raitses, Y.; Smirnov, A.; Fisch, N. J. // Physics of Plasmas;May2009, Vol. 16 Issue 5, p057106 

    Interesting discharge phenomena are observed that have to do with the interaction between the magnetized Hall thruster plasma and the neutralizing cathode. The steady-state parameters of a highly ionized thruster discharge are strongly influenced by the electron supply from the cathode. The...

  • Development of a Concept of Reflectometric Diagnostics for the ITER Tokamak for Plasma Probing from the High-Magnetic-Field Side. Vershkov, V. A.; Soldatov, S. V.; Shelukhin, D. A.; Urazbaev, A. O. // Instruments & Experimental Techniques;Mar/Apr2004, Vol. 47 Issue 2, p182 

    The capabilities of the reflectometric diagnostics in the ITER facility during plasma probing from the high-magnetic-field side are investigated. This technique allows measurements of the density profile and the plasma turbulence-rotation velocity at the lower extraordinary wave from a plasma...

  • Oxygen transport in the internal xenon plasma of a dispenser hollow cathode. Capece, Angela M.; Polk, James E.; Mikellides, Ioannis G.; Shepherd, Joseph E. // Journal of Applied Physics;2014, Vol. 115 Issue 15, p153302-1 

    Reactive gases such as oxygen and water vapor modify the surface morphology of BaO dispenser cathodes and degrade the electron emission properties. For vacuum cathodes operating at fixed temperature, the emission current drops rapidly when oxygen adsorbs on top of the low work function surface....

  • Use of Langmuir probes in a weakly ionized, steady-state plasma with strong magnetic field. Batani, D.; Alba, S.; Lombardi, P.; Galassi, A. // Review of Scientific Instruments;Nov97, Vol. 68 Issue 11, p4043 

    Describes the use of Langmuir probes to measure plasma parameters in low density, low temperature plasmas with a strong applied magnetic field. Instrumental and ionic sheath effects; Comparison of experimental results with direct measurements of the electron distribution function in the...

  • Operating a radio-frequency plasma source on water vapor. Nguyen, Sonca V. T.; Foster, John E.; Gallimore, Alec D. // Review of Scientific Instruments;Aug2009, Vol. 80 Issue 8, p083503 

    A magnetically enhanced radio-frequency (rf) plasma source operating on water vapor has an extensive list of potential applications. In this work, the use of a rf plasma source to dissociate water vapor for hydrogen production is investigated. This paper describes a rf plasma source operated on...

  • Anomalous conductivity and secondary electron emission in Hall effect thrusters. Garrigues, L.; Hagelaar, G. J. M.; Boniface, C.; Boeuf, J. P. // Journal of Applied Physics;12/15/2006, Vol. 100 Issue 12, p123301 

    This paper is devoted to the study of the effects of electron-wall interactions on cross magnetic field electron momentum and energy losses in Hall effect thrusters. By coupling a semianalytical model of the wall sheath similar to models used by several authors in this context, with a...

  • Thermal effect on anode during field electron emission from cathode. Nevolin, V. K. // Technical Physics Letters;Dec2006, Vol. 32 Issue 12, p1030 

    It is demonstrated that, during field electron emission from the cathode, the amount of heat evolved in the anode can differ from the classical value, provided that the translational energy of electrons reaching the anode does not exceed the Fermi energies of electrons in the dissimilar...

  • Cathode effects in cylindrical Hall thrusters. Granstedt, E. M.; Raitses, Y.; Fisch, N. J. // Journal of Applied Physics;Nov2008, Vol. 104 Issue 10, p103302 

    Stable operation of a cylindrical Hall thruster has been achieved using a hot wire cathode, which functions as a controllable electron emission source. It is shown that as the electron emission from the cathode increases with wire heating, the discharge current increases, the plasma plume angle...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics