Sputtering yield and nanopattern formation study of BNSiO2 (Borosil) at elevated temperature relevance to Hall Effect Thruster

Parida, Basanta Kumar; Sooraj, K.P.; Hans, Sukriti; Pachchigar, Vivek; Augustine, Sebin; Remyamol, T.; Ajith, M.R.; Ranjan, Mukesh

doi:10.1016/j.nimb.2022.01.001

Cited by 3 publications

(5 citation statements)

References 31 publications

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“…The gap between the experimental measurements and the numerical estimations by using "enlarged" Ranjan et al's [13] data was attributed to neglecting the effect of wall temperature. By introducing the temperature coefficient C T (Section 2.2), the sputter yield value, and hence the erosion, indeed increases, as demonstrated by Parida et al [12].…”

Section: Resultsmentioning

confidence: 77%

“…The results were obtained with C T = 5.5, which meant considering five times the value of the sputtering yield measured at room temperature (300 K) at each energy and angle. Parida et al [12] experimentally measured that the sputtering yield at 55°and 500 eV (which is higher than the typical value estimated in HETs' channel, i.e., lower than 250 eV) is twice the value at room temperature.…”

Section: Discussionmentioning

confidence: 81%

“…The basic concept of the TS model is that the small region of the surface where the highly energetic particle impacts undergoes a sudden increase in temperature, resulting in evaporation of atoms from the surface. The TS model is proposed to be the reason for the increase in sputtering observed in the experiment carried out by Parida et al [12], too.…”

Section: Discussionmentioning

confidence: 97%

“…With the purpose of including the effect of temperature, the recent work of Parida et al [12] was studied. The authors analyzed how the sputter yield of the Xe-Borosil pair at an incidence of 55°and at an energy of 500 eV vary in the range 300-873 K. The main conclusion is that there is an almost linear variation with temperature.…”

Section: Sputtering Modelingmentioning

confidence: 99%

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Numerical Modeling of Erosion in Hall Effect Thrusters

Passet,

Panelli,

Battista

2024

Particles

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The erosion of the accelerating chamber walls is one of the main factors limiting the operational life of Hall effect thrusters (HETs), and it is mainly related to the sputtering of ceramic walls due to the impacting energetic ion particles. The erosion phenomenon is investigated by means of a numerical model that couples the plasma model HYPICFLU2, used for evaluating the local distributions of ion energies and incidence angles, and a sputtering model specific for the xenon–Borosil pair, which is the most used in HETs application. The sputtering yield model is based on the measurements by Ranjan et al. that are improved with a linear factor to include wall temperature effect, recently studied by Parida et al. The experimental eroded profiles of SPT100 walls are selected as benchmark. The results show that there is a decrease in erosion speed with time, in accordance with experimental measurements, but the model underestimates, by about 50–60%, the erosion at the channel exit, which suggests a stronger dependence of sputter yield on surface temperature. Thus, the need for new experimental measurements of sputtering in the range of impact energy, angle, and wall temperature, respectively, of 10–250 eV, 0–85°, 30–600 °C, arises.

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Section: Resultsmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 97%

Section: Sputtering Modelingmentioning

confidence: 99%

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Numerical Modeling of Erosion in Hall Effect Thrusters

Passet,

Panelli,

Battista

2024

Particles

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“…In the densification phase, the anisotropic growth is negligible [55], and the metals cannot be deformed before the structural transformation of the dielectric has been completed, i.e., when the sample overlaps completely. The thermal spike nature has been proposed to interpret different crystallographic orientations of materials; see for example reference [56]. Ion irradiation of amorphous SiO 2 in various energy ranges (between 1 MeV and 1 GeV) causes structural changes [43].…”

Section: Resultsmentioning

confidence: 99%

Anisotropic deformation of colloidal particles under 4 MeV Cu ions irradiation

Dawi

Mustafa²,

Siahaan³

2022

Mater. Res. Express

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Anisotropic deformation of colloidal particles was investigated under ion irradiation with 4 MeV Cu ions. In this study, 0.5 µm-diameter colloidal silica particles, 0.5 µm-diameter Au-silica core-shell particles, and 15 nm-diameter Au colloids embedding in a planar Si/SiO2 matrix were irradiated with 4 MeV Cu ions at room temperature and normal incidence. In colloidal silica particles, ion beam irradiation causes dramatic anisotropic deformation; silica expands perpendicular to the beam and contracts parallel, whereas Au cores elongate. Au colloids in a planar SiO2 matrix were anisotropically transformed from spherical colloids to elongated nanorods by irradiating them with 4 MeV Cu ions. The degree of anisotropy varied with ion flux. Upon irradiating the embedded Au colloids, dark-field light scattering experiments revealed a distinct color shift to yellow, which indicates a shift in surface plasmon resonance. A surface plasmon resonance measurement reveals the plasmon resonance bands are split along the arrays of Au colloids. Our measurements have revealed resonance shifts that extend into the near-infrared spectrum by as much as 50 nm.

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Experimental observation of low-frequency interactions at different scales and evidence of transit time oscillations in a Hall thruster: Spectral analysis

Delavière—Delion,

Gaboriau,

Fubiani

et al. 2024

Physics of Plasmas

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Hall thrusters are E×B plasma devices characterised by a large azimuthal electron current, which is involved in the formation of a wide variety of instabilities on different frequency scales (from kilohertz to gigahertz) and propagating in different directions. We have focused on a limited number of low-frequency instabilities that could be experimentally observed, such as breathing mode (BM) and ion transit time oscillations (ITTO). There are still gray areas in the understanding of the mechanisms behind these instabilities, which are often described individually, without considering an eventual exchange of information between the different types of instability. A wavelet time-frequency study of the plasma revealed the coexistence and interdependence of distinct instabilities. We suspect a possible interaction between the breathing mode and higher-frequency oscillations leading to ITTOs: it was shown that a transition occurred when the frequency of one of the BM harmonics became a multiple of the frequency of the higher-frequency oscillations. This was also accompanied by a deformation of the ion energy distribution functions.

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Sputtering yield and nanopattern formation study of BNSiO2 (Borosil) at elevated temperature relevance to Hall Effect Thruster

Cited by 3 publications

References 31 publications

Numerical Modeling of Erosion in Hall Effect Thrusters

Numerical Modeling of Erosion in Hall Effect Thrusters

Anisotropic deformation of colloidal particles under 4 MeV Cu ions irradiation

Experimental observation of low-frequency interactions at different scales and evidence of transit time oscillations in a Hall thruster: Spectral analysis

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