Demonstration of 10,400 Hours of Operation on 4.5 kW Qualification Model Hall Thruster

Grys, Kristi de; Mathers, Alex; Welander, Ben; Khayms, Vadim

doi:10.2514/6.2010-6698

Cited by 75 publications

(79 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…De Grys et al 8 recovered magnetic shielding to some extent with the Hall2De numerical simulation tool by Mikellides et al 9 Hall2De is an axisymmetric hydrodynamical model, which improves over the HPHall hybrid code developed by Fife, 6 especially by not assuming a priori electron temperature uniformity along field lines. Nonetheless, this model remains limited by the hypothesis of temperature isotropy which implies the absence of magnetic confinement of electrons.…”

mentioning

confidence: 99%

Influence of oblique magnetic field on electron cross-field transport in a Hall effect thruster

Miedzik

Barral²,

Daniłko

2015

Physics of Plasmas

View full text Add to dashboard Cite

The effects of the inclination of the magnetic field with respect to the channel walls in a Hall effect thruster are numerically studied with the use of a one-dimensional quasi-neutral Particle-In-Cell model with guiding center approximation of electron motion along magnetic lines. Parametric studies suggest that the incidence angle strongly influences electron transport across the magnetic field. In ion-focusing magnetic topologies, electrons collide predominantly on the side of the magnetic flux tube closer to the anode, thus increasing the electron cross-field drift. The opposite effect is observed in ion-defocussing topology. V C 2015 AIP Publishing LLC.

show abstract

mentioning

confidence: 99%

Influence of oblique magnetic field on electron cross-field transport in a Hall effect thruster

Miedzik

Barral²,

Daniłko

2015

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

“…However, the thrust generated in the thrusters is very small compared to that of conventional chemical rockets. Accordingly, to take advantage of their high specific impulse and high efficiency, long and continuous operation lasting several years is required 2) . Hollow cathodes are regularly employed as electron sources in Hall thrusters to ionize the propellant using electric discharges and to neutralize the ion beam leaving the thrusters [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Radio Frequency Plasma Cathodes for Hall Thrusters

Watanabe

Deguchi

Takeda

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

View full text Add to dashboard Cite

To liberate Hall thrusters from the drawbacks associated with dispenser hollow cathodes, we construct and experimentally evaluate an outer-coil-type radio frequency (RF) plasma cathode and an inner-coil-type RF plasma cathode. The influence of the coil configuration on the electron-emission characteristics of the RF plasma cathodes is significant. Compared to the inner-coil-type RF plasma cathode, the outer-coil-type RF plasma cathode achieved higher electronemission performance. For the outer-coil-type RF plasma cathode, we obtained an anode current of 3.3 A at an RF power of 140 W, a xenon mass flow rate of 0.3 mg/s, and an anode voltage of 58 V. The anode current is sufficiently high to operate a 1-kW class Hall thruster. The gas utilization factor for the outer-coil-type RF plasma cathode is comparable to that for a conventional dispenser hollow cathode. On the other hand, the electron production cost for the outer-coil-type RF plasma cathode is four times higher than that for the hollow cathode. Thus, there is a need to improve the power consumption for application of RF plasma cathodes to Hall thrusters.

show abstract

“…As previously reviewed, nano-ripples were observed on glass substrates early on by Navez et al (1962). In addition, ripple formations have been seen to develop on the insulator rings of Hall thrusters at the mm-scale (De Grys et al 2010). The latter case likely involved the influence of stress effects due to plasma bombardment and thermal conditions.…”

Section: Kmentioning

confidence: 99%

Stability and symmetry of ion-induced surface patterning

2017

View full text Add to dashboard Cite

We present a continuum model of ion-induced surface patterning. The model incorporates the atomic processes of sputtering, re-deposition and surface diffusion, and is shown to display the generic features of the damped Kuramoto-Sivashinsky (KS) equation of non-linear dynamics. Linear and non-linear stability analyses of the evolution equation give estimates of the emerging pattern wavelength and spatial symmetry. The analytical theory is confirmed by numerical simulations of the evolution equation with the Fast Fourier Transform method, where we show the influence of the incident ion angle, flux, and substrate surface temperature. It is shown that large local geometry variations resulting in quadratic non-linearities in the evolution equation dominate pattern selection and stability at long time scales.

show abstract

Demonstration of 10,400 Hours of Operation on 4.5 kW Qualification Model Hall Thruster

Cited by 75 publications

References 3 publications

Influence of oblique magnetic field on electron cross-field transport in a Hall effect thruster

Influence of oblique magnetic field on electron cross-field transport in a Hall effect thruster

Performance Evaluation of Radio Frequency Plasma Cathodes for Hall Thrusters

Stability and symmetry of ion-induced surface patterning

Contact Info

Product

Resources

About