Experimental characterization of non-Maxwellian electron energy distributions in a miniaturized microwave plasma neutralizer

Sekine, Hokuto; Minematsu, R.; Ataka, Yasuho; Ominetti, P.; Koizumi, Hiroyuki; Komurasaki, Kimiya

doi:10.1063/5.0069600

Cited by 7 publications

(3 citation statements)

References 45 publications

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“…The referenced results, however, are assumed to be derived from different plasma parameters from those of the Hall thruster discharge plasma. The typical electron temperature and density are 10-20 eV and 10 17 m −3 for the microwave discharge ion source [45,46], whereas 20-30 eV and 10 18 m −3 for xenon Hall thrusters [47]. Although high temperature electrons additionally produce H + and H + 2 , the reaction rates for them are less than 1/10 of that producing H 2 O + in the typical electron temperature regime [38].…”

Section: Performance Analysis Methodsmentioning

confidence: 99%

Demonstration and experimental characteristics of a water-vapor Hall thruster

et al. 2023

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Water is an attractive candidate for condensable propellants owing to its availability, handleability, and sustainability. This study proposes the use of water vapor as a propellant for a low-power Hall thruster, and experimentally demonstrates the feasibility of this proposal. Based on the performance estimation from the plume diagnostics, a thrust-to-power ratio of 19 mN/kW, specific impulse of 550–860 s, and anode efficiency of 5–8 % were obtained at an anode power of 233–358 W. From further efficiency analysis, the mass utilization efficiency of water was found to be the most deteriorated among the internal efficiencies compared to the conventional xenon propellant, which was consistent with the expectations from a small discharge current oscillation, large beam divergence, and increase in low-energy ions. Moreover, additional power loss via reactions unique to polyatomic molecules was indicated by evaluation of the ionization cost. In this experiment, the mass utilization efficiency was improved with an increase in the anode voltage from 200 to 240 V without degradation of the power utilization. This suggests that operating at a higher voltage is more suitable for a water-vapor Hall thruster.

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Section: Performance Analysis Methodsmentioning

confidence: 99%

Demonstration and experimental characteristics of a water-vapor Hall thruster

et al. 2023

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“…For example, in magnetosphere, plasma particles exhibit super-thermal energy tails that cannot be described by Maxwellian VDF [32]. Likewise, number of laboratory plasmas are reported to have non-Maxwellian electron VDF [33][34][35][36][37]. Moreover, in some situations, the Maxwellian VDF cannot be retained without a heating mechanism or special plasma sources [38].…”

Section: Introductionmentioning

confidence: 99%

Dust-ion-acoustic shock waves in the presence of (r, q) distributed electrons

Khan,

Huzaif,

Kamran

2023

Phys. Scr.

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A three-component dusty plasma system, with non-Maxwellian electrons, is investigated. The ions are considered to be mobile, the (spherical) dust is assumed to be stationary with charge- fluctuations, and the electrons follow the generalized (r , q) velocity distribution function (VDF). The respective Burger's equation, which manifests a shock structure, is derived by employing a reductive perturbation technique (RPT). It is deduced that dust charge fluctuations induce shock potential in a collisionless plasma system. The resultant perturbed potential is evaluated as affected by different plasma parameters, e.g., the ratios of electron to ion temperature (σ_i) and equilibrium densities (μ), and the non-thermal indices r and q. The shock amplitude is seen to decrease when the value of σ_i is increased, and vice versa, whereas an opposite trend is observed for μ. It is found that for r = 0 and increasing values of spectral index q, amplitude of the potential distribution enhances while its width decreases. It is further noted that non-Maxwellian VDF significantly modifies the potential distribution. For the limiting case, namely, r = 0 and q→∞, the corresponding Maxwellian results are retrieved which benchmarks our findings. Present work will be useful in understanding the nonlinear propagation of dust-ion-acoustic shock waves in system where non-thermal population - as caused by various physical processes - of electrons are observed.

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“…Numerous laboratory plasmas, such as direct-current (DC) and electron cyclotron resonance (ECR) discharges [17,18], inductively coupled plasma (ICPs) and capacitively coupled plasma (CCPs) [19,20] are reported to have non-Maxwellian electron VDF. Moreover, the electron VDF in laser-produced plasmas [1] is non-Maxwellian.…”

Section: Introductionmentioning

confidence: 99%

Effect of generalized (r, q)-distributed electrons on ion polytropic coefficient in bounded plasmas

Shabbir¹,

Khan²,

Kamran³

2022

J. Phys. A: Math. Theor.

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The generalized (r, q) velocity distribution function (VDF) is used to describe the quasineutral region of the basic bounded plasma as presented by Tonks and Langmuir. In this regard, the electrons are assumed to follow the (r, q) VDF, and the ions are assumed to be produced as a result of electron-impact ionization of cold neutrals. The plasma approximation is used to calculate the corresponding ion VDF, as well as the ion density, temperature and polytropic coefficient, as affected by the nonthermal indices r and q. The obtained results correspond to the Maxwellian counterparts in proper limits. The present work will be useful in fusion devices where non-Maxwellian electrons may exist due to various physical phenomena.

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Experimental characterization of non-Maxwellian electron energy distributions in a miniaturized microwave plasma neutralizer

Cited by 7 publications

References 45 publications

Demonstration and experimental characteristics of a water-vapor Hall thruster

Demonstration and experimental characteristics of a water-vapor Hall thruster

Dust-ion-acoustic shock waves in the presence of (r, q) distributed electrons

Effect of generalized (r, q)-distributed electrons on ion polytropic coefficient in bounded plasmas

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