Interpretation of a Planar Langmuir Probe Current — Voltage Characteristic in a Strong Magnetic Field

Stanojević, M.; Čerček, M.; Gyergyek, T.; Jelić, N.

doi:10.1002/ctpp.2150340502

Cited by 15 publications

(14 citation statements)

References 24 publications

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“…Thus, in general, the rate of electron cross-field transport required to sustain the discharge in a low-power thruster may be different from that in kilowatt thrusters. In other types of low-temperature magnetized laboratory plasmas, variation of the electron cross-field diffusion rate with applied magnetic field B occurs indeed: For example, in [22], cross-field diffusion coefficient D ⊥ was observed to approach the Bohm value when B was greater than 2-3 kG, while in B<1 kG case D ⊥ was much smaller than the Bohm value.…”

Section: =300vmentioning

confidence: 99%

Electron cross-field transport in a miniaturized cylindrical Hall thruster

Smirnov

Raitses

Fisch

2006

IEEE Trans. Plasma Sci.

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Conventional annular Hall thrusters become inefficient when scaled to low power. Cylindrical Hall thrusters, which have lower surface-to-volume ratio, are more promising for scaling down. They presently exhibit performance comparable with conventional annular Hall thrusters. The present paper gives a review of the experimental and numerical investigations of electron crossfield transport in the 2.6 cm miniaturized cylindrical Hall thruster (100 W power level). We show that, in order to explain the discharge current observed for the typical operating conditions, the electron anomalous collision frequency ν B has to be on the order of the Bohm value, ν B ≈ω c /16. The contribution of electron-wall collisions to cross-field transport is found to be insignificant. The optimal regimes of thruster operation at low background pressure (below 10-5 Torr) in the vacuum tank appear to be different from those at higher pressure (~10-4 Torr).

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Section: =300vmentioning

confidence: 99%

Electron cross-field transport in a miniaturized cylindrical Hall thruster

Smirnov

Raitses

Fisch

2006

IEEE Trans. Plasma Sci.

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“…Stanojevic and co-workers further developed Stangeby's model in strongly magnetized, low temperature, Ar discharge plasmas. 4,5 In their improved model, Stanojevic and co-workers divided the whole perturbed region near the probe into two subregions: a ''free-fall region'' with the characteristic scale length of the collision mean free path, and a long ''interaction region'' where macroscopic quasineutrality is conserved by ambipolar current collection. From the series of measurements, they calculated the cross-field diffusion coefficient as approaching the corresponding D Ќ Bohm when B was greater than 2-3 kG.…”

Section: Introductionmentioning

confidence: 99%

Langmuir probe in low temperature, magnetized plasmas: Theory and experimental verification

Koo

Hershkowitz

Sarfaty

1999

Journal of Applied Physics

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Articles you may be interested inDetection of electron energy distribution function anisotropy in a magnetized electron cyclotron resonance plasma by using a directional Langmuir probe Phys. Plasmas 21, 073510 (2014); 10.1063/1.4890350Optical emission spectroscopy and Langmuir probe diagnostics of CH3F/O2 inductively coupled plasmasThe Langmuir probe as a diagnostic of the electron component within low temperature laser ablated plasma plumes Rev.Diagnostics of inductively amplified magnetron discharges by optical emission, absorption spectroscopy, and Langmuir probe measurements Langmuir probe theory, adapted to magnetized, partially ionized, low temperature processing plasmas with radial diffusion dominated by electron-neutral collisions, was verified in electron cyclotron resonance ͑ECR͒ plasmas. Plasma parameters such as plasma potential, electron temperature, plasma density, and the ratio of electron saturation current to ion saturation current (I e */I i *) were measured by single-sided planar probe in various ECR plasmas ͑H 2 , He, N 2 , O 2 , Ar, and CF 4 ͒. The neutral pressure was varied between 0.5 and 8.5 mTorr and the microwave power between 170 and 1250 W with good matching conditions; the reflected power was kept at less than 3% of the input power. The measured ratios of I e */I i * , and other plasma parameters were consistent with the probe theory for pressures greater than 2.0 mTorr for various plasmas of Ar, He, H 2 , and N 2 . These results indicate that the electron-neutral collisional probe theory works well for magnetized ECR plasmas ͑magnetic flux densities of 0.8-1.0 kG͒.

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“…However, the ion and electron currents to a floating probe are insensitive to the current reduction factor , and size of the probe in the presence of a magnetic field (Stangeby 1982; Stanojević et al. 1994). In this work, a planar Langmuir probe at floating potential has been employed for the detection of the IAWs.…”

Section: Experimental Set-upmentioning

confidence: 99%

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Deka,

Paul,

Sharma

et al. 2023

J. Plasma Phys.

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An experimental study to investigate the effect of an external magnetic field on the propagation of ion-acoustic waves (IAWs) has been carried out in hydrogen plasma containing two-temperature electrons and dust grains. It is a first step in understanding the propagation properties of IAWs in such an environment. A low-pressure hot cathode discharge method is chosen for plasma production. The desired two-electron groups with distinct temperatures are achieved by inserting two magnetic cages with a cusp-shaped magnetic field of different surface field strengths in the same chamber. The dust grains are dropped into the plasma with the help of a dust dropper, which gain negative charges by interacting with the plasma. The IAWs are excited with the help of a mesh grid inserted into the plasma. A planar Langmuir probe is used as a detector to detect the IAWs. The time-of-flight technique has been applied to measure the phase velocity of the IAWs. The results suggest that in the presence of a magnetic field, the phase velocity of IAWs increases, whereas introducing the dust particles leads to the lower phase velocity. The magnetic field is believed to have a significant effect on the wave damping. This study will aid in utilising IAWs as a diagnostic tool to estimate plasma parameters in the presence of an external magnetic field.

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Interpretation of a Planar Langmuir Probe Current — Voltage Characteristic in a Strong Magnetic Field

Cited by 15 publications

References 24 publications

Electron cross-field transport in a miniaturized cylindrical Hall thruster

Electron cross-field transport in a miniaturized cylindrical Hall thruster

Langmuir probe in low temperature, magnetized plasmas: Theory and experimental verification

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

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