Manipulating the electron distribution through a combination of electron injection and MacKenzie’s Maxwell Demon

Yip, Chi-Shung; Hershkowitz, N.

doi:10.1088/0963-0252/24/3/034004

Cited by 17 publications

(32 citation statements)

References 14 publications

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“…Plasma chemistry and interactions with boundaries are often the responsible mechanisms for producing desired outcomes in industrial devices; so the ability to control them can provide a basis for improving the performance of existing devices, as well as for the development of new devices. Examples of methods being explored in this area include tailored RF waveforms [159], externally biased electrodes [160] and electron emitting surfaces [161].…”

Section: Plasma Theorymentioning

confidence: 99%

The 2017 Plasma Roadmap: Low temperature plasma science and technology

Adamovich

Baalrud

Bogaerts

et al. 2017

J. Phys. D: Appl. Phys.

780

549

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Section: Plasma Theorymentioning

confidence: 99%

The 2017 Plasma Roadmap: Low temperature plasma science and technology

Adamovich

Baalrud

Bogaerts

et al. 2017

J. Phys. D: Appl. Phys.

780

549

View full text Add to dashboard Cite

“…The first model of the fireball diameter [55] combined the Langmuir condition from equation (48) with the requirement that the rate of ion production within the fireball must equal the rate of ion loss into the bulk plasma. The latter condition was modeled by treating the fireball as a complete sphere, and assuming the contribution of the electrode surface is negligible, leading to [55] Γ e Dσ i N = Γ i (52) where D is the diameter, N is the neutral gas number density, and σ i is the electron impact ionization cross section. Combining these provides a prediction for the fireball diameter…”

Section: Sizementioning

confidence: 99%

Interaction of biased electrodes and plasmas: sheaths, double layers, and fireballs

Baalrud

Scheiner

Yee

et al. 2020

Plasma Sources Sci. Technol.

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Biased electrodes are common components of plasma sources and diagnostics. The plasma-electrode interaction is mediated by an intervening sheath structure that influences properties of the electrons and ions contacting the electrode surface, as well as how the electrode influences properties of the bulk plasma. A rich variety of sheath structures have been observed, including ion sheaths, electron sheaths, double sheaths, double layers, anode glow, and fireballs. These represent complex self-organized responses of the plasma that depend not only on the local influence of the electrode, but also on the global properties of the plasma and the other boundaries that it is in contact with. This review summarizes recent advances in understanding the conditions under which each type of sheath forms, what the basic stability criteria and steady-state properties of each are, and the ways in which each can influence plasma-boundary interactions and bulk plasma properties. These results may be of interest to a number of application areas where biased electrodes are used, including diagnostics, plasma modification of materials, plasma sources, electric propulsion, and the interaction of plasmas with objects in space.

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“…The most common situation is the electron saturation region region of a Langmuir probe sweep, but they arise in many other situations including negative ion sources [2] and electron sources [3], positive electrodes employed for blob control [4], particle circulation in dusty plasmas [5], and turbulence-induced particle fluxes [6]. Electron sheaths are also common in several other situations, including: near highly emitting surfaces [7], in microdischarges [8], during the high potential phase of the rf cycle in processing discharges [9], around electrodynamic tethers [10], the lunar photosheath [11], around wire arrays used for electron temperature control [12], and in scrape off layer control [13].…”

Section: Introductionmentioning

confidence: 99%

Electron presheaths: the outsized influence of positive boundaries on plasmas

Yee

Scheiner

Barnat

et al. 2017

Plasma Sources Sci. Technol.

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Electron sheaths form near the surface of objects biased more positive than the plasma potential, such as a Langmuir probe collecting electron saturation current. Generally, the formation of electron sheaths requires that the electron-collecting area be sufficiently smaller ( 2.3me/M times) than the ion-collecting area. They are commonly thought to be local phenomena that collect the random thermal electron current, but do not otherwise perturb a plasma. Here, using experiments on an electrode embedded in a wall in a helium discharge, particle-in-cell simulations, and theory it is shown that under low temperature plasma conditions (Te Ti) electron sheaths are far from local. Instead, a long presheath region (27 mm, approximately an electron's mean free path) extends into the plasma where electrons are accelerated via a pressure gradient to a flow speed exceeding the electron thermal speed at the sheath edge. This fast flow is found to excite instabilities, causing strong fluctuations near the sheath edge.

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Manipulating the electron distribution through a combination of electron injection and MacKenzie’s Maxwell Demon

Cited by 17 publications

References 14 publications

The 2017 Plasma Roadmap: Low temperature plasma science and technology

The 2017 Plasma Roadmap: Low temperature plasma science and technology

Interaction of biased electrodes and plasmas: sheaths, double layers, and fireballs

Electron presheaths: the outsized influence of positive boundaries on plasmas

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