Mobility Studies of a Pure Electron Plasma in Hall Thruster Fields

Fossum, Emily C.; King, Lyon B.; Makela, Jason M.

doi:10.2514/6.2006-5173

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…These results were consistent with results obtained in previous experiments with this electron trap 21 . …”

Section: B Mobility Measurementssupporting

confidence: 83%

Design and Construction of an Electron Trap for Studying Cross-Field Mobility in Hall Thrusters

Fossum

King²

2007

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Excessive cross-field electron mobility in Hall thrusters has a negative effect on thruster efficiency and has been shown experimentally to be much larger than predicted by classical collisional transport theory. An electron trapping apparatus was constructed at Michigan Tech's Isp Lab in order to study electron dynamics in the defining electric and magnetic fields of a Hall-effect thruster. This apparatus was designed to stably trap a non-neutral electron plasma in a confining volume in order to study these dynamics in a highly controlled environment. Electrons are confined using only electric and magnetic fields in the absence of ions and dielectric walls, which are present in a typical Hall thruster. Mobility studies on a low-density, non-neutral plasma provide several advantages over a typical Hall thuster's quasi-neutral plasma, including a well-defined electric field and the ability to take internal electrostatic probe measurements in the "acceleration" region. Cross-field electron mobility was investigated in response to magnetic and electric field strengths and background neutral density. Experimental design considerations including loading mechanisms, trapping potential, magnetic field design, calibration, and diagnostic techniques are presented along with preliminary experimental results. In this investigation, measured cross-field mobility is much larger than classical theory predicts and appears to be consistent with Bohm-like mobility rather than classical mobility. = permittivity of free space e = elementary charge E = electric field vector E z = axial electric field F µ = magnetic mirror force F E|| = parallel electric field force Nomenclature= current density at the anode J ez = cross-field electron current density J p = current density at the probe m e = electron mass µ, µ 0 = magnetic moment of gyrating particle µ ez = cross-field electron mobility n e , n " = electron number density n 0 = neutral particle density

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“…These results were consistent with results obtained in previous experiments with this electron trap 21 . …”

Section: B Mobility Measurementssupporting

confidence: 83%

Design and Construction of an Electron Trap for Studying Cross-Field Mobility in Hall Thrusters

Fossum

King²

2007

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

Self Cite

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“…Nevertheless, the anomalous diffusion is not believed to be a unique feature of Hall Thrusters. That is why several experiments have been recently designed and carried out to do basic research and analyse the anomalous diffusion mechanism in devices much simpler than typical HETs [50,51,36,52].…”

Section: Chapter 2 Bibliography Reviewmentioning

confidence: 99%

Global Linear Stability Analysis of the Spoke Oscillation in Hall Effect Thrusters

Escobar¹,

Ahedo²

2014

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“…Nevertheless, the anomalous diffusion is not believed to be a unique feature of Hall thrusters. That is why several experiments have been recently designed and carried out to do basic research and analyse the anomalous diffusion mechanism in devices much simpler than typical Hall thrusters [49,50,35,51].…”

Section: Anomalous Diffusionmentioning

confidence: 99%

Electron transport and azimuthal oscillations in hall thrusters

Anton¹

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Mobility Studies of a Pure Electron Plasma in Hall Thruster Fields

Cited by 3 publications

References 15 publications

Design and Construction of an Electron Trap for Studying Cross-Field Mobility in Hall Thrusters

Design and Construction of an Electron Trap for Studying Cross-Field Mobility in Hall Thrusters

Global Linear Stability Analysis of the Spoke Oscillation in Hall Effect Thrusters

Electron transport and azimuthal oscillations in hall thrusters

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