Total and differential sputter yields of boron nitride measured by quartz crystal microbalance

Rubin, Binyamin; Topper, James L.; Yalin, Azer P.

doi:10.1088/0022-3727/42/20/205205

Cited by 35 publications

(30 citation statements)

References 38 publications

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“…It is beyond the scope of this thesis to investigate about the most appropriate sputtering model so that the employed model was decided by the fitting to the Rubin's experiment result 36 with the assumption that the threshold energy equals to 25 eV. Accordingly, the arbitrary fitting parameters were calculated as A ¼ 3.64 and B ¼ 150.0.…”

Section: F Sputtering Modelmentioning

confidence: 99%

Kinetic particle simulation of discharge and wall erosion of a Hall thruster

Cho

Komurasaki²,

Arakawa

2013

Physics of Plasmas

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The primary lifetime limiting factor of Hall thrusters is the wall erosion caused by the ion induced sputtering, which is predominated by dielectric wall sheath and pre-sheath. However, so far only fluid or hybrid simulation models were applied to wall erosion and lifetime studies in which this non-quasi-neutral and non-equilibrium area cannot be treated directly. Thus, in this study, a 2D fully kinetic particle-in-cell model was presented for Hall thruster discharge and lifetime simulation. Because the fully kinetic lifetime simulation was yet to be achieved so far due to the high computational cost, the semi-implicit field solver and the technique of mass ratio manipulation was employed to accelerate the computation. However, other artificial manipulations like permittivity or geometry scaling were not used in order to avoid unrecoverable change of physics. Additionally, a new physics recovering model for the mass ratio was presented for better preservation of electron mobility at the weakly magnetically confined plasma region. The validity of the presented model was examined by various parametric studies, and the thrust performance and wall erosion rate of a laboratory model magnetic layer type Hall thruster was modeled for different operation conditions. The simulation results successfully reproduced the measurement results with typically less than 10% discrepancy without tuning any numerical parameters. It is also shown that the computational cost was reduced to the level that the Hall thruster fully kinetic lifetime simulation is feasible. V C 2013 AIP Publishing LLC. [http://dx

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Section: F Sputtering Modelmentioning

confidence: 99%

Kinetic particle simulation of discharge and wall erosion of a Hall thruster

Cho

Komurasaki²,

Arakawa

2013

Physics of Plasmas

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“…Thus, assuming the emission intensity is linearly proportional to the Boron density, the observation indicates that the erosion rate increases One explanation for the dramatic increase in the Boron erosion rate for increased discharge voltage is that the ions impacting the thruster ceramic walls have much higher energies for high-voltage cases. Experiments of Boron Nitride bombarded by Xe + show that sputtering yield increases as the ion energy impinging on the surface increases [5,22,23,24].In addition, it is expected that the plasma temperature increases as the discharge voltage is increased.Such an increase in plasma temperature would increase the electron induced excitation collision rate, thus the emission intensity. In addition, increased plasma temperature would result in an increase in the wall temperature.…”

Section: Voltage Scanmentioning

confidence: 99%

“…However, some of the high-energy ions hit the channel walls causing the sputtering of the ceramic insulator material [4]. Removal of the wall material this way, eventually causes the underlying magnetic yoke to be exposed [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…According to the study by Rubin et al [5] where the sputter yield measurements, by quartz crystal microbalance, of BoronNitride due to bombardment by Xenon ions of relevant energies are presented, the sputtering predominantly occurs as atoms of B and N, but not so much as BN or other B x N y . Thus, measurements of Boron neutral emission would provide a good measure of the relative total erosion rate of the Hall thruster channels.…”

Section: Introductionmentioning

confidence: 99%

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Use of emission spectroscopy for real-time assessment of relative wall erosion rate of BHT-200 hall thruster for various regimes of operation

Çelik¹,

Batishchev²,

Martı́nez-Sánchez³

2010

Vacuum

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Radiation emission due to Boron atoms sputtered from the Boron-Nitride ceramic walls of a BHT-200 Hall thruster was measured as a diagnostic for real time assessment of thruster wall erosion and to determine the effects of various operation conditions on thruster lifetime. Boron neutral 249.677 and 249.773nm lines were measured using a high resolution spectrometer. Spectral measurement results and the accompanying analysis and discussion are presented in this study. From the spectral measurements it was observed that the Boron emission intensity significantly increases for increased discharge voltage pointing to a large increase in the thruster wall erosion rate. Additionally, the measurements show that for the nominal discharge voltage and the applied magnetic field intensity, there is an optimum propellant flow rate for minimum Boron emission, thus minimum wall erosion rate. The variation in the current to the magnet coils showed that the Boron emission intensity increases for increased magnetic field and the Boron emission intensity shows similar behavior to that of the Xenon single ion emission line intensity at 248.911nm. The findings of the study show that emission spectroscopy can be used in determining the optimum operational parameters for minimum wall erosion for SPT type Hall thrusters.

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“…Also, if the thruster plume is not correctly focused, it can lead to spacecraft charging and arc formation on the solar panel surfaces, which is not good for the overall satellite life time. [1][2][3][4] Once the ceramic wall is completely eroded, the pole piece erosion will begin and there is possibility of modifying the magnetic field profile, which in turn will affect the performance of the thruster. Therefore, ceramic wall erosion investigation and choice of material is very important for the design of a plasma thruster.…”

Section: Introductionmentioning

confidence: 99%

BN/BNSiO2 sputtering yield shape profiles under stationary plasma thruster operating conditions

et al. 2016

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Quartz Crystal Microbalance (QCM) is used to measure the volumetric and total sputtering yield of Boron Nitride (BN) and Boron Nitride Silicon Dioxide (BNSiO2) bombarded by Xenon ions in the energy range of 100 eV to 550 eV. Sputtering yield shape profiles are reported at various angles of incidence 0-85° with surface normal and compared with modified Zhang model. The yield shape profile is found to be symmetric at normal incidence and asymmetric at oblique incidence. Both the materials show a sudden jump in the sputtering yield above 500 eV and at an angle of incidence in the range of 45-65°. Erosion of BN at as low as 74 eV ion energy is predicted using generalized Bohdansky model. BNSiO2 show a marginally higher sputtering yield compare to BN.

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Total and differential sputter yields of boron nitride measured by quartz crystal microbalance

Cited by 35 publications

References 38 publications

Kinetic particle simulation of discharge and wall erosion of a Hall thruster

Kinetic particle simulation of discharge and wall erosion of a Hall thruster

Use of emission spectroscopy for real-time assessment of relative wall erosion rate of BHT-200 hall thruster for various regimes of operation

BN/BNSiO2 sputtering yield shape profiles under stationary plasma thruster operating conditions

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