Mode Coupling Phenomena of Longitudinal Quarter-Wavelength Resonance of a Plasma Column Produced by Surface Waves

Nonaka, Shigehiko

doi:10.1143/jpsj.59.1623

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…The SW reflected from the end of the metal enclosure (Figure 1) results in a standing wave in the plasma column, which ensures the conditions for the formation of longitudinal plasma resonances. [ 14 ] The part of the thruster, where the plasma absorbs the microwave energy and where the high‐density plasma is produced, is denoted as the resonant chamber in Figure 1.…”

Section: Sw Plasma Source and Experimental Setupmentioning

confidence: 99%

“…[8] The METs with effective plasma generation are also constructed by a coaxial cavity with a length, which is less than one-quarter wavelength (l = 1/4 𝜆) [9] or by a coaxial cavity with surface waves (SW) plasma. [10,11] In this study, we present a new type of a microwave electrothermal plasma thruster, [12] which uses SW plasma [13] with longitudinal plasma resonances [14] for heating up the gas in an alumina chamber. It has a low average power consumption (2-3 W) and is suitable for applications in nanosatellites, following the CubeSat standard.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we present a new type of a microwave electrothermal plasma thruster, [ 12 ] which uses SW plasma [ 13 ] with longitudinal plasma resonances [ 14 ] for heating up the gas in an alumina chamber. It has a low average power consumption (2–3 W) and is suitable for applications in nanosatellites, following the CubeSat standard.…”

Section: Introductionmentioning

confidence: 99%

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Microwave electrothermal thruster with surface wave plasma

Kiss'ovski,

Yordanov,

Marinov

et al. 2024

Contrib. Plasma Phys

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A new microwave electrothermal thruster (MET) with small dimensions (length of 25 mm and diameter of 6 mm), utilizing surface wave (SW) plasma at low average power consumption Pav ˜ 2 W, is made. It uses microwaves at a frequency of 2.45 GHz for plasma generation within a dielectric chamber enclosed in a metal shield. The SW is excited at the plasma‐dielectric interface by a coaxial launcher and a standing wave is created due to the wave reflection from the shield. The high‐density plasma produced in this resonant chamber heats up the argon gas, which expands through the nozzle in the axial direction. The temperature of the gas decreases from 1900 K at atmospheric pressure to 1200 K at 10 Torr ambient pressure. This small‐sized MET shows stable low‐pressure operation with a thrust of 4 mN and an efficiency of 8% and is suitable for nanosatellite orbit control.

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Section: Sw Plasma Source and Experimental Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microwave electrothermal thruster with surface wave plasma

Kiss'ovski,

Yordanov,

Marinov

et al. 2024

Contrib. Plasma Phys

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“…The propellant gas (argon) is fed through the core metal tube into the gas heating chamber, which is also a resonance chamber for longitudinal plasma resonances [25] and it is denoted as resonant chamber in Figure 1. Microwave power is applied to the resonant chamber through coaxial transmission line.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the plasma processes for propellant heating in electrothermal plasma thruster for nanosatellites

Ivanov

Kolev

Kiss’ovski

2021

Contributions to Plasma Physics

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Numerical investigation of the plasma processes in a cylindrical chamber with small dimensions of a novel microwave electrothermal plasma thruster for nanosatellites has been conducted. The absorbed microwave power from the electrons in the plasma column of the surface wave discharge is included in the computational model as a heat source with Gaussian distribution. The computational model takes into account the elastic and inelastic collisions of the electrons with the atoms in the ground state and two excited states (−s, −p) and the processes of recombination and deactivation of the plasma species in the volume and on the walls of the chamber. The computational model includes the flow of neutral gas and the processes in the plasma for effective heating of neutral particles by collisions not only with electrons but also with ions. Selected combinations of input power and propellant mass flow rates are used as initial parameters for the numerical investigation. The results show that at higher mass flow rates the heating of the neutral gas is more effective and at power levels of 4 W and propellant mass flow rate of 3 mg/s the electrothermal plasma thruster demonstrates effective performance and thrust levels in the order of 1 mN.

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“…EVERAL STUDIES have investigated standing-wave modes in cylindrical plasma sources closed at both ends [1]- [4]. In this paper, we report on two studies of cylindrical plasma sources with a geometry involving one closed end, an antenna to launch the waves, and an essentially free end well removed from the antenna.…”

mentioning

confidence: 99%

Travelling Modes in Wave-Heated Plasma Sources

Rayner

Cheetham

2010

IEEE Trans. Plasma Sci.

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Abstract-This paper describes a theoretical and experimental study of surface-and helicon-wave-heated plasma sources in which standing waves are set up in the cavity between the closed end plate to a plasma vessel and a wave launcher while travelling waves propagate from the opposite side of the launcher into a region which is long compared with the attenuation distance of the waves. We model the situation as a lossy transmission line of finite length coupled at the launcher to a lossy transmission line of infinite extent. RF power applied to the launcher divides in the ratio of the input impedances of the two transmission lines. For a conducting end plate, the power delivered to the travelling waves is a maximum when the cavity length is an odd number of 1/4 wavelengths long for which its input impedance is a maximum. Similarly, for an insulated end plate, the power delivered to the travelling waves is a maximum for a cavity with a length equal to an integer number of half wavelengths for which its input impedance is again a maximum.

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Mode Coupling Phenomena of Longitudinal Quarter-Wavelength Resonance of a Plasma Column Produced by Surface Waves

Cited by 6 publications

References 11 publications

Microwave electrothermal thruster with surface wave plasma

Microwave electrothermal thruster with surface wave plasma

Numerical investigation of the plasma processes for propellant heating in electrothermal plasma thruster for nanosatellites

Travelling Modes in Wave-Heated Plasma Sources

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