2D expansion of the low-density interelectrode vacuum arc plasma jet in an axial magnetic field

Keidar, Michael; Beilis, I. I.; Boxman, R.L.; Goldsmith, S.

doi:10.1088/0022-3727/29/7/034

Cited by 175 publications

(90 citation statements)

References 22 publications

(30 reference statements)

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“…The numerical analysis is similar to that developed previously 15 . We use the implicit twolayer method to solve the system of equations (1) …”

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confidence: 59%

Effects of Segmented Electrode in Hall Current Plasma Thrusters

Raitses¹,

Keidar²,

Staack³

et al. 2001

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Segmented electrodes with a low secondary electron emission are shown to alter significantly plasma flow in ceramic channel of Hall thruster. The location of the axial acceleration region relative to the magnetic field can be moved. The radial potential distribution can also be altered near the channel walls. A hydrodynamic model shows that these effects are consistent with a lower secondary electron emission of the segmented electrode as compared to ceramic channel walls.2

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“…The numerical analysis is similar to that developed previously 15 . We use the implicit twolayer method to solve the system of equations (1) …”

mentioning

confidence: 59%

Effects of Segmented Electrode in Hall Current Plasma Thrusters

Raitses¹,

Keidar²,

Staack³

et al. 2001

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“…An iterative self-consistent procedure for finding the plasma density, velocity, electron temperature and potential distribution is employed similarly to Ref. 41. While it is not clear how channel width affects plasma turbulence and associated with this anomalous electron transport, it is expected that the channel width can affect electronwall collisions.…”

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confidence: 99%

Electron-wall Interaction in Hall Thrusters

Raitses¹,

Staack²,

Keidar³

et al. 2005

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Electron-wall interaction effects in Hall thrusters are studied through measurements of the plasma response to variations of the thruster channel width and the discharge voltage.The discharge voltage threshold is shown to separate two thruster regimes. Below this threshold, the electron energy gain is constant in the acceleration region and therefore, secondary electron emission (SEE) from the channel walls is insufficient to enhance electron energy losses at the channel walls. Above this voltage threshold, the maximum electron temperature saturates. This result seemingly agrees with predictions of the temperature saturation, which recent Hall thruster models explain as a transition to space charge saturated regime of the near-wall sheath. However, in the experiment, the maximum saturation temperature exceeds by almost three times the critical value estimated under the assumption of a Maxwellian electron energy distribution function.The channel narrowing, which should also enhance electron-wall collisions, causes unexpectedly larger changes of the plasma potential distribution than does the increase of the electron temperature with the discharge voltage. An enhanced anomalous crossed field mobility (near-wall or Bohm-type) is suggested by a hydrodynamic model as an explanation to the reduced electric field measured inside a narrow channel. We found, however, no experimental evidence of a coupling between the electron temperature and the location of the accelerating voltage drop, which might have been expected due to the SEE-induced near-wall conductivity.2

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“…An important step forward in the development of two-dimensional mathematical models was made by the authors of [4,5] who used hydrodynamic equations for electrons and ions (assuming the constancy of temperatures) along with electrodynamic equations. The problem was reduced to a simultaneous solution of the equation of motion for ions and the equation for potential of the type of Poisson equation with a complex right-hand side dependent on unknown functions.…”

Section: Introductionmentioning

confidence: 99%

“…This model was used to calculate the distributions of densities of current and plasma and determine the shape of the plasma channel boundary for relatively low (~500 A) values of current. The model of [4,5] ignored the anode drop which may affect significantly the current density distribution. In addition, no boundary condition was formulated in [4,5] for the Poisson equation on the cathode boundary of plasma.…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Mathematical Model of a Short Vacuum Arc in External Magnetic Field

Londer

Ul’yanov

2005

High Temp

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A mathematical model of a short high-current vacuum arc is developed. The model involves equations of motion and continuity for electrons and ions, as well as electrodynamic equations. The boundary conditions are formulated on the cathode and anode boundaries of plasma and on the side surface of plasma. The model is based on the method of trajectories, in the case of which a set of partial equations can be reduced to a set of ordinary differential equations written for derivatives along ion trajectories. The model is used to determine the region of steady-state solutions and to calculate the distribution of the parameters of arc plasma in this region.

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2D expansion of the low-density interelectrode vacuum arc plasma jet in an axial magnetic field

Cited by 175 publications

References 22 publications

Effects of Segmented Electrode in Hall Current Plasma Thrusters

Effects of Segmented Electrode in Hall Current Plasma Thrusters

Electron-wall Interaction in Hall Thrusters

A Two-Dimensional Mathematical Model of a Short Vacuum Arc in External Magnetic Field

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