Deflections of dynamic momentum flux and electron diamagnetic thrust in a magnetically steered rf plasma thruster

Imai, Ryoji; Takahashi, Kazunori

doi:10.1088/1361-6463/ac4451

Cited by 8 publications

(8 citation statements)

References 46 publications

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“…The Gaussian deconvolution method, or Gaussian fitting, has been used to obtain the ion-energy distribution function from the I-V characteristics measured by a retarding field energy analyzer 2,16,19 . This involves an iterative process of integrating a Gaussian curve that models the ion-energy distribution function until the raw I-V data are reconstructed.…”

Section: Gaussian Deconvolutionmentioning

confidence: 99%

“…The ion-energy distribution function has usually been computed by obtaining the first derivative of the collected current over the discriminator voltage 2,5,6,[14][15][16][17][18][19] . It can be shown that, by assuming a one-dimensional velocity distribution 14 , the ion-energy distribution g i (ε i ) is proportional to the negative derivative of the collected current I C with respect to the discriminator grid voltage V D :…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, analog differentiation has been performed by using appropriate electronics circuitry to obtain the IEDF and the EEPF 3,17,[28][29][30] . The IEDF has also been obtained using a Gaussian deconvolution method 2,16,19 .…”

Section: Introductionmentioning

confidence: 99%

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Data Processing Techniques for Ion and Electron Energy Distribution Functions

Caldarelli¹,

Filleul²,

Boswell³

et al. 2022

Preprint

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Retarding field energy analyzers and Langmuir probes are routinely used to obtain ion and electron energy distribution functions (IEDF, EEDF). These typically require knowledge of the first and second derivatives of the I-V characteristics, both of which can be obtained in various ways. This poses challenges inherent to differentiating noisy signals, a frequent problem with electric-probe plasma diagnostics. A brief review of commonly used analog and numerical filtering and differentiation techniques is presented, together with their application on experimental data collected in a radio-frequency plasma. The application of each method is detailed with regards to the obtained IEDF and EEDF, the deduced plasma parameters, dynamic range, energy resolution and signal distortion.

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Section: Gaussian Deconvolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Data Processing Techniques for Ion and Electron Energy Distribution Functions

Caldarelli¹,

Filleul²,

Boswell³

et al. 2022

Preprint

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“…The concept of thrust vectoring via a steerable magnetic nozzle has also been the subject of different research campaigns [27][28][29][30]. This could allow for a mechanically simpler and more reliable orbit and attitude control mechanism since it does not comprise any moving or rotating components.…”

Section: Introductionmentioning

confidence: 99%

“…the location of plasma excitation coincides with the magnetic nozzle throat), the experiments presented herein are conducted in an RF plasma device in which the antenna and the coils are not placed on the same axial location (see figure 3). Studies with a similar experimental design have been carried out by [16,21,29,[31][32][33][34]. In this configuration, the plasma is created remotely with respect to the magnetic nozzle throat.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic nozzle strength and orientation on radio-frequency plasma expansion

Caldarelli

Filleul

Charles

et al. 2023

Plasma Sources Sci. Technol.

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To improve the efficiency of radio-frequency magnetic nozzle plasma thrusters, it is important to better understand the coupling between plasma expansion and a convergent-divergent magnetic field. This study explores the effects of magnetic field strength and orientation on plasma expansion in a magnetic nozzle.Two-dimensional measurements of the plasma characteristics obtained both in the source and in the expansion region are presented to investigate the influence of magnetic field strength on the formation of high-density conics in a symmetric magnetic nozzle. The measurements are repeated in a deflected magnetic nozzle using a novel magnetic steering system. Measurements of the ion saturation current and floating potential profiles are used respectively to qualitatively assess the plasma density distribution and the presence of high-energy electrons for the magnetic field configurations analysed. In the symmetric magnetic nozzle configuration, it is observed that the ion saturation current peaks on axis in the plasma source, but downstream of the nozzle throat, a double-peaked hollow profile is observed for all cases studied. The location of the high-density conics structure matches the most radial field lines that intersect the antenna and can freely expand downstream outside the source. Negative values of the floating potential are measured in the same peripheral regions, which could be a sign of the presence of high-energy electrons. When the magnetic field is deflected, the ion saturation current profile shows only a single peak centred around the bent field line that reconnects to the antenna. Again, a region of negative floating potential is measured at the location of the maximum ion current. Thus, it is shown how, independent of magnetic field strength and orientation, the magnetic field lines interacting with the antenna dictate the local plasma profiles downstream from the magnetic nozzle.

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Radial characterization of an ion beam in a deflected magnetic nozzle

et al. 2022

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The radial characterization of an ion beam generated in a magnetically steered radio-frequency (RF) plasma source is presented. In the symmetrical magnetic nozzle (MN) configuration, radial profiles of the ion saturation current obtained with a planar Langmuir probe show a double-peaked profile. The same behaviour is confirmed by the radial measurements of the total ion current and the ion energy distribution functions (IEDFs) obtained with a retarding field energy analyzer. The IEDFs also show the presence of an ion beam centred at $$r = -2$$ r = - 2 cm. On the contrary, radial measurements taken with a magnetic nozzle deflected on the $$r - z$$ r - z plane exhibit a single-peaked profile with both the local ion population and the ion beam centred at $$r = -5$$ r = - 5 cm, in the direction of the MN orientation. It is shown that the ion beam location is changed as a result of a deflected magnetic nozzle, and that it follows the direction of increasing radial magnetic field.

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Deflections of dynamic momentum flux and electron diamagnetic thrust in a magnetically steered rf plasma thruster

Cited by 8 publications

References 46 publications

Data Processing Techniques for Ion and Electron Energy Distribution Functions

Data Processing Techniques for Ion and Electron Energy Distribution Functions

Effects of magnetic nozzle strength and orientation on radio-frequency plasma expansion

Radial characterization of an ion beam in a deflected magnetic nozzle

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