Strongly Emitting Surfaces Unable to Float below Plasma Potential

Campanell, Michael; Umansky, M.

doi:10.1103/physrevlett.116.085003

Cited by 91 publications

(109 citation statements)

References 35 publications

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“…Similarly, flows can drive instabilities in the plasma-boundary transition region. These include drifts between secondary electrons emitted from a boundary and plasma electrons [158]. They also include differential flows between ions and electrons or different ion species, which are accelerated by pre-sheath electric fields.…”

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

“…Some other kinetic sheath models combined with PIC or Vlasov kinetic simulation also found that strong electron emission causes sheath structure transition from classic sheath to SCL sheath; [20][21][22][23][24] while the sheath was predicted to transit to an inverse Debye layer structure with a fixed ion flux through the sheath region, 25 and a more entirely inverse sheath structure with no ion through the sheath region; 26 and if ion collisions are included, these collisions cause ions get trapped in virtual cathode and force a transition to the inverse sheath. 27 The effect of emitted electron temperature (EET) on potential of critical SCL sheath was specially investigated in recent several years by Sheehan et.al with kinetic theory analysis, particle-in-cell simulation and experiment measurement. 28,29 They found that EET significantly affects sheath potential, especially sheath potential goes to zero when EET equals T e .…”

Section: Introductionmentioning

confidence: 99%

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Qing

Zhou

2017

AIP Advances

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Electrons emitted from a solid surface can noticeably affect characteristics of plasma sheath surrounding that surface by modifying current balance at wall, charge separation in sheath region and Bohm criterion at sheath edge. We establish a static sheath model with kinetic electrons and cold ions to emphasize the effect of different total emitted electron velocity distribution functions (EEVDFs) on classic sheath solution and its structure transition. Four total EEVDFs with same average energy are considered separately. It is found that total EEVDFs influence the sheath solution and the threshold of total electron emission coefficient (EEC) for classic sheath dramatically, and can cause no solution for critical space-charge limited (SCL) sheath. These results indicate that, as EEC increases from zero gradually, the sheath will not transit from classic sheath to SCL sheath structure for some special total EEVDFs.

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“…Campanell and Umansky [] performed simulations of nonmonotonic profiles starting with a negative surface potential and concluded that these are nonequilibrium states that quickly evolve to a positive potential configuration. Given the observational evidence for nonmonotonic negative surface potentials on the lunar dayside, it seems likely that nonmonotonic potentials are stable for extended periods relative to characteristic plasma time scales in the lunar environment.…”

Section: Discussion Of the Functional Formmentioning

confidence: 94%

Stair‐step particle flux spectra on the lunar surface: Evidence for nonmonotonic potentials?

Collier

Newheart

Poppe

et al. 2017

Geophysical Research Letters

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We present examples of unusual “stair‐step” differential flux spectra observed by the Apollo 14 Suprathermal Ion Detector Experiment on the lunar dayside surface in Earth's magnetotail. These spectra exhibit a relatively constant differential flux below some cutoff energy and then drop off precipitously, by about an order of magnitude or more, at higher energies. We propose that these spectra result from photoions accelerated on the lunar dayside by nonmonotonic potentials (i.e., potentials that do not decay to zero monotonically) and present a model for the expected differential flux. The energy of the cutoff and the magnitude of the differential flux are related to the properties of the local space environment and are consistent with the observed flux spectra. If this interpretation is correct, these surface‐based ion observations provide a unique perspective that both complements and enhances the conclusions obtained by remote‐sensing orbiter observations on the Moon's exospheric and electrostatic properties.

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Strongly Emitting Surfaces Unable to Float below Plasma Potential

Cited by 91 publications

References 35 publications

The 2017 Plasma Roadmap: Low temperature plasma science and technology

The 2017 Plasma Roadmap: Low temperature plasma science and technology

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Stair‐step particle flux spectra on the lunar surface: Evidence for nonmonotonic potentials?

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