Plasma Acceleration from RF Discharge in Dielectric Capillary

Dunaevsky, A.; Raitses, Yevgeny; Fisch, Nathaniel J.

doi:10.2172/842400

Cited by 4 publications

(9 citation statements)

References 8 publications

(8 reference statements)

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“…Notice the same order of initial electron temperature in the stem of the surface discharge on ferroelectric plasma cathodes in vacuum, which was measured in Ref. 8. The concept of temperature is applicable here, because at the gas pressure of about 10 Torr the frequency of momentum transfer collisions is high, m ϳ4 ϫ10 10 s Ϫ1 , and randomization of the energy gained by electrons from the driving electric field happens fast.…”

Section: Gas Discharge Mode Of Fps Operationsupporting

confidence: 61%

“…8. The initial plasma density was found to be n i ϳ0.4-4ϫ10 17 cm Ϫ3 , which would correspond to an ionization rate of ϳ20%.…”

Section: Vϭmentioning

confidence: 94%

“…Indeed, at the position of the first probe, xϭ5.5 mm from the surface, at tϭ2.2 ms from the beginning of the driving pulse, plasma density in the combined mode at Pϭ8 Torr was found about of order of magnitude higher than in vacuum discharge mode. 8 Difference in the energy consumption between Pϳ10 Ϫ7 Torr and Pϭ8 Torr at the same driving voltage amplitude is only ϳ20%.…”

Section: Vϭmentioning

confidence: 97%

“…Recently, a method of deducing of the initial plasma parameters from temporal profiles of the density of expanding plasma has been developed. 8 It was shown that the initial plasma density in the stem of the discharge could reach (4 -40)ϫ10 16 cm Ϫ3 , and the initial electron temperature is 16 -20 eV. Such a high density corresponds to a pressure of neutral gas of 1-10 Torr at room temperature, assuming full ionization.…”

Section: Introductionmentioning

confidence: 99%

“…It indeed corresponds within an order of magnitude to the estimation of neutral density at the surface reported by Chirko et al 9 Assuming the thickness of the discharge stems as 10-20 m, we obtain an initial density of neutrals у10 17 cm Ϫ3 . 8 Thus, it is reasonable to expect the appearance of a king of gas discharge at the surface of FPS immersed into a gas with a density of several Torr or higher. Indeed, a gas discharge induced by FPS was observed earlier.…”

Section: Introductionmentioning

confidence: 99%

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Operation of ferroelectric plasma sources in a gas discharge mode

Dunaevsky

Fisch

2004

Physics of Plasmas

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Ferroelectric plasma sources in vacuum are known as sources of ablative plasma, formed due to surface discharge. In this paper, observations of a gas discharge mode of operation of the ferroelectric plasma sources (FPS) are reported. The gas discharge appears at pressures between ∼20 and ∼80 Torr. At pressures of 1–20 Torr, there is a transition from vacuum surface discharge to the gas discharge, when both modes coexist and the surface discharges sustain the gas discharge. At pressures between 20 and 80 Torr, the surface discharges are suppressed, and FPS operates in pure gas discharge mode, with the formation of almost uniform plasma along the entire surface of the ceramics between strips. The density of the expanding plasma is estimated to be about 1013 cm−3 at a distance of 5.5 mm from the surface. The power consumption of the discharge is comparatively low, making it useful for various applications. This paper also presents direct measurements of the yield of secondary electron emission from ferroelectric ceramics, which, at low energies of primary electrons, is high and dependent on the polarization of the ferroelectric material.

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Section: Gas Discharge Mode Of Fps Operationsupporting

confidence: 61%

“…8. The initial plasma density was found to be n i ϳ0.4-4ϫ10 17 cm Ϫ3 , which would correspond to an ionization rate of ϳ20%.…”

Section: Vϭmentioning

confidence: 94%

Section: Vϭmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Operation of ferroelectric plasma sources in a gas discharge mode

Dunaevsky

Fisch

2004

Physics of Plasmas

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Dependence of ion sheath collapse on secondary electron emission in plasma immersion ion implantation

Kwok

et al. 2007

Applied Physics Letters

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Numerical studies of collisionless and collisional sheath evolution in plasma source ion implantations Phys. Plasmas 12, 043501 (2005); 10.1063/1.1861057 Effects of assistant anode on planar inductively coupled magnetized argon plasma in plasma immersion ion implantation J. Appl. Phys. 93, 5883 (2003); 10.1063/1.1568151Effect of secondary electron emission on sheath potential in an electron cyclotron resonance plasmaThe collapse of the ion sheath in front of a dielectric substrate during argon plasma immersion ion implantation is investigated using a Langmuir probe. The probe signals during the buildup and collapse of the ion sheath are recorded from a lime glass substrate with a magnesium metal plate placed on top. The collapsing speed of the ion sheath is shown to strongly depend on the secondary electron emission coefficient of the substrate. The authors' results show that it is possible to derive secondary electron emission coefficients from insulating materials based on the probe signals.

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Kinetic sheath in presence of multiple positive ions, negative ions, and particle wall emission

Schiesko

Wünderlich

Montellano

2020

Journal of Applied Physics

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The region between a Maxwellian plasma source and a floating or current-carrying surface is described by a static, one-dimensional collisionless kinetic sheath model. In the plasma source, electrons, negative ions and several positive ion species with different temperatures can be included. The surface (wall) can emit electrons and/or negative ions. When the flux of surface-emitted negative ions and/or electrons reaches a critical value, the sheath becomes spacecharge saturated which leads to the formation of a virtual cathode in front of the emitting wall and set the maximum current density that can be transported from the surface to the plasma. The analytical results are benchmarked against a particle-in-cell code.

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Plasma Acceleration from RF Discharge in Dielectric Capillary

Cited by 4 publications

References 8 publications

Operation of ferroelectric plasma sources in a gas discharge mode

Operation of ferroelectric plasma sources in a gas discharge mode

Dependence of ion sheath collapse on secondary electron emission in plasma immersion ion implantation

Kinetic sheath in presence of multiple positive ions, negative ions, and particle wall emission

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