Modeling of a discharge in crossed fields with account of collisions and ionization

Коваленко, А. С.; Kovalenko, Yu. A.

doi:10.1134/1.1626772

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…In view of the complex dependence of the collision probability on the electron energy, it may be considered that the calculated and experimentally obtained relations correctly represent the dependences of the discharge current on the magnetic field related to the changes in the plasma conductivity in crossed electric and magnetic fields. These relations also agree with the theoretical calculations and experimental results obtained in [9] at lower discharge currents.…”

Section: Resultssupporting

confidence: 93%

Generation of Gas Discharge Plasma by an Arc Source with a Cold Hollow Cathode

2005

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The results from a study of an arc plasma source with a cold hollow cathode are presented. The source generates plasma with a density of ~10 10 cm -3 in a volume of ~0.2 m 3 at discharge currents of up to 150 A, an arc discharge operating voltage of 30-40 V, and a low pressure of 0.1-1 Pa. The motion of the cathode spot in the crossed electric and magnetic fields inside the hollow cathode and the cathode's special design make it possible to eliminate almost completely the penetration of the sputtered cathode material into the working vacuum chamber.

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Section: Resultssupporting

confidence: 93%

Generation of Gas Discharge Plasma by an Arc Source with a Cold Hollow Cathode

2005

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“…The collisionless limit for this region was obtained in [39] as a B-layer solution. Collisions were taken into account in [40,41]. The region of the magnetic B-layer is characterized by the highest deviation of VDF from the equilibrium state.…”

Section: Local Structure Of Discharge and Violation Of Quasi-neutralitymentioning

confidence: 99%

On a force balance and role of cathode plasma in Hall effect thrusters

Chernyshev¹,

Krivoruchko²

2022

Plasma Sources Sci. Technol.

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The cathode plasma is a specific transition region in the Hall Effect Thruster (HET) discharge that localizes between the strongly magnetized acceleration layer (magnetic layer or B-layer) and non-magnetized exhaust plume. Cathode plasma provides a flow of electron current that supplies losses in the magnetic layer (due to ionization, excitation, electron-wall interactions, etc.). The electrons' transport in this region occurs in collisionless mode through the excitation of plasma instabilities. This effect is also known as "anomalous transport/conductivity". In this work, we present the results of a 2d (drift-plane) kinetic simulation of the HET discharge, including the outside region that contains cathode plasma. We discuss the process of cathode plasma formation and the mechanisms of "anomalous transport" inside it. We also analyze how fluid force balance emerges from collisionless kinetic approach. The acceleration mechanism in Hall Effect Thrusters (HETs) is commonly described in terms of force balance. Namely, the reactive force produced by accelerated ions has the same value as Ampère's force acting on a drift current loop. This balance written in integral form provides the basis for quantitative estimations of HETs' parameters and scaling models.

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“…They demonstrated the operation of almost quasi-linear modes of the medium between the anode and the cathode with the ionic current density far exceeding j CL . To achieve this, the authors of [41][42][43] had to use a special procedure in order to choose appropriate conditions for the Poisson equation.…”

Section: Generation Of the Anodic Layer-a Virtual Anodementioning

confidence: 99%

“…First it is assumed that the potential of the anodic layer is smaller than the discharge voltage: j L <V d . As in [40][41][42][43], we neglect the proper magnetic field of the discharge current. But the electron Hall current flowing along the Y-axis will change the magnetic field directed along the Z-axis from a constant external field B 0 to the field B z (x).…”

Section: Generation Of the Anodic Layer-a Virtual Anodementioning

confidence: 99%

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

Bardakov

Ivanov

Kazantsev

et al. 2018

Plasma Sci. Technol.

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In a plasma accelerator with an anodic layer (PAAL), we discovered experimentally the effect of 'super-acceleration' of the bulk of the ions to energies W exceeding the energy equivalent to the discharge voltage V d. The E×B discharge was ignited in an environment of atomic argon and helium and molecular nitrogen. Singly charged argon ions were accelerated most effectively in the case of the largest discharge currents and pressure P of the working gas. Helium ions with W>eV d (e being the electron charge) were only recorded at maximum pressures. Molecular nitrogen was not accelerated to energies W>eV d. Anomalous acceleration is realized in the range of radial magnetic fields on the anode 2.8×10-2 B rA 4×10-2 T. It was also found analytically that the cathode of the accelerator can receive anomalously accelerated ions. In this case, the value of the potential in the anodic layer becomes higher than the anode potential, and the anode current exceeds some critical value. Numerical modeling in terms of the developed theory showed qualitative agreement between modeling data and measurements.

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Modeling of a discharge in crossed fields with account of collisions and ionization

Cited by 8 publications

References 1 publication

Generation of Gas Discharge Plasma by an Arc Source with a Cold Hollow Cathode

Generation of Gas Discharge Plasma by an Arc Source with a Cold Hollow Cathode

On a force balance and role of cathode plasma in Hall effect thrusters

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

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