Dust Charging in Space‐related Laboratory Experiments: A Review Focused on Secondary Emission

Pavlu, Jiri; Šafránková, Jana; Němeček, Zdenek; Richterová, I.

doi:10.1002/ctpp.200910019

Cited by 15 publications

(6 citation statements)

References 91 publications

(116 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has important consequences for the electric charging of nanograins of size ≲ l e in plasmas: the sticking coefficient of the plasma electrons impacting the grain decreases below unity [17][18][19], and the electron secondary emission induced by impacting electrons exceeds the value for bulk matter [20,21].…”

Section: Size Smaller Than Mean Electron Free Pathsmentioning

confidence: 99%

The physics and detection of nanodust in the solar system

Meyer‐Vernet¹,

Mann²,

Chat³

et al. 2014

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

The mass distribution of small bodies in the solar system extends over more than 35 orders of magnitude, from asteroids to nanodust, which bridge the gap between molecules and macroscopic submicron grains. The small size of nanograins compared to the relevant basic scales gives them peculiar properties. Some of these properties affect their electric charging and their large chargeto-mass ratio drives their acceleration to very high speeds in moving magnetised plasmas, as the solar wind and rotating planetary magnetospheres. The electric charge and/or high speed of nanograins have enabled them to be detected serendipitously in various parts of the solar system by several instruments designed to study larger dust, plasma particles, or waves, on a number of spacecraft. These discoveries have opened an emerging field of research, in which many open questions remain, in particular concerning the lower size limit of the particles.

show abstract

Section: Size Smaller Than Mean Electron Free Pathsmentioning

confidence: 99%

The physics and detection of nanodust in the solar system

Meyer‐Vernet¹,

Mann²,

Chat³

et al. 2014

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…In a first-order approximation, the material of the spheres is unimportant for the interactions of the spheres with the microparticles and the plasma-metallic, dielectric and semiconductor spheres will all attain floating potential when exposed to the plasma. Secondary effects such as secondary electron emission depend on the material [33,34], but are beyond the scope of the present paper to take into account.…”

Section: Introductionmentioning

confidence: 99%

Observation of metallic sphere–complex plasma interactions in microgravity

Schwabe¹,

Zhdanov²,

Hagl³

et al. 2017

New J. Phys.

View full text Add to dashboard Cite

The PK-3 Plus laboratory on board the International Space Station is used to study the interaction between metallic spheres and a complex plasma. We show that the metallic spheres significantly affect both the local plasma environment and the microparticle dynamics. The spheres charge under the influence of the plasma and repel the microparticles, forming cavities surrounding the spheres. The size of the cavity around a sphere is used to study the force balance acting on microparticles at the cavity edge. We show that the ion drag force and pressure force from other microparticles balances with the electric force acting from the sphere to within 20%. At intermediate distances from the sphere surface, the interaction between the microparticles and the metallic spheres is attractive due to the drag force stemming from the ions which are moving towards the highly charged spheres. The spheres thus strongly affect the plasma fluxes. This modification of the plasma flux can lead to an effective surface tension acting on the microparticles, and to the excitation of dust-density waves near the spheres, as the local electric field crosses a threshold.

show abstract

“…(1) cannot be satisfied because ion cannot be negative. This problem can arise when the secondary electron emission (SEE) coefficient of the plasma electrons, γ , exceeds unity for the wall material; this is known or predicted to occur in certain conditions at surfaces in tokamak scrape-off layers [5,6], plasma thruster channels [7], dusty plasmas [8], and hot astrophysical plasmas [9]. When γ > 1, emit = γ p > p for any .…”

Section: Introductionmentioning

confidence: 99%

Negative plasma potential relative to electron-emitting surfaces

Campanell

2013

Phys. Rev. E

View full text Add to dashboard Cite

Most works on plasma-wall interaction predict that with strong electron emission, a nonmonotonic "space-charge-limited" (SCL) sheath forms where the plasma potential is positive relative to the wall. We show that a fundamentally different sheath structure is possible where the potential monotonically increases toward a positively charged wall that is shielded by a single layer of negative charge. No ion-accelerating presheath exists in the plasma and the ion wall flux is zero. An analytical solution of the "inverse sheath" regime is demonstrated for a general plasma-wall system where the plasma electrons and emitted electrons are Maxwellian with different temperatures. Implications of the inverse sheath effect are that (a) the plasma potential is negative, (b) ion sputtering vanishes, (c) no charge is lost at the wall, and (d) the electron energy flux is thermal. To test empirically what type of sheath structure forms under strong emission, a full plasma bounded by strongly emitting walls is simulated. It is found that inverse sheaths form at the walls and ions are confined in the plasma. This result differs from past particle-in-cell simulation studies of emission which contain an artificial "source sheath" that accelerates ions to the wall, leading to a SCL sheath at high emission intensity.

show abstract

Dust Charging in Space‐related Laboratory Experiments: A Review Focused on Secondary Emission

Cited by 15 publications

References 91 publications

The physics and detection of nanodust in the solar system

The physics and detection of nanodust in the solar system

Observation of metallic sphere–complex plasma interactions in microgravity

Negative plasma potential relative to electron-emitting surfaces

Contact Info

Product

Resources

About