Relation of Charging History to Field Ion Emission From Gold and Carbon Dust

Jerab, M.; Vaverka, Jakub; Vysinka, Marek; Němeček, Zdenek; Šafránková, Jana

doi:10.1109/tps.2009.2036014

Cited by 3 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect was attributed to an implantation of the beam ions into the grain surface and their backward diffusion and consecutive field ionization of desorbed atoms. This conclusion was confirmed by further measurements that used carbon dust grains and Ar ions (Jerab et al 2010). The authors developed a simple model of the grain discharging that takes into account the field ionization of the residual atmosphere in the vacuum vessel and diffusion and field ionization of the implanted ions.…”

Section: Ion Beam Experimentsmentioning

confidence: 68%

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

et al. 2011

Self Cite

View full text Add to dashboard Cite

Dusty plasma effects in near earth space and interplanetary mediumSpace Science Reviews, 2011, Vol. 161, Issue 1-4: 1-47 10.1007/s11214-011-9762-3Access to the published version may require subscription. Published with permission from:Springer Science+Business Media B.V.Space Science Reviews manuscript No. (will be inserted by the editor) Dusty plasma effects in near Earth space and interplanetary mediumReceived: date / Accepted: date Abstract We review dust and meteoroid fluxes and their dusty plasma effects in the interplanetary medium near Earth orbit and in the Earth's ionosphere. Aside from in-situ measurements from sounding rockets and spacecraft, experimental data cover radar and optical observations of meteors. Dust plasma interactions in the interplanetary medium are observed by the detection of charged dust particles, by the detection of dust that is accelerated in the solar wind and by the detection of ions and neutrals that are released from the dust. These interactions are not well understood and lack quantitative description. There is still a huge discrepancy in the estimates of meteoroid mass deposition into the atmosphere. The radar meteor observations are of particular interest for determining this number. Dust measurements from spacecraft require a better understanding of the dust impact ionization process, as well as of the dust charging processes. The latter are also important for further studying nano dust trajectories in the solar wind. Moreover understanding of the complex dependencies that cause the variation of nano dust fluxes is still a challenge.

show abstract

Section: Ion Beam Experimentsmentioning

confidence: 68%

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…This effect is well known for small grains or the grains of highly non-spherical shape [46]. The surface potential is limited by the field emission in such a case [47]. The heavy line shows the theoretical floating potential of the 1 µm SiO 2 grain computed using the Sternglass theory [33] and corrected on the angular dependence of the SEE yield.…”

Section: Motivationmentioning

confidence: 87%

“…We include the SEE current, J sec , and the thermionic current, J therm , because the grain can be heated by the hot dense plasma. A contribution of the field emission current, J fe caused by the strong electric field above the grain surface [47] can be important for small grains charged to high negative potentials.…”

Section: Dust Charging In Fusion Plasmamentioning

confidence: 99%

The influence of secondary electron emission on the floating potential of tokamak-born dust

Vaverka

Richterová

Vysinka

et al. 2014

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

Dust production and its transport into the core plasma is an important issue for magnetic confinement fusion. Dust grains are charged by various processes, such as the collection of plasma particles and electron emissions, and their charge influences the dynamics of the dust. This paper presents the results of calculations of the surface potential of dust grains in a Maxwellian plasma. Our calculations include the charging balance of a secondary electron emission (SEE) from the dust. The numerical model that we have used accounts for the influence of backscattered electrons and takes into account the effects of grain size, material, and it is also able to handle both spherical and non-spherical grains. We discuss the role of the SEE under tokamak conditions and show that the SEE is a leading process for the grains crossing the scrape-off layer from the edge to core plasma. The results of our calculations are relevant for materials related to fusion experiments in ITER.

show abstract

Linear trap with three orthogonal quadrupole fields for dust charging experiments

Beránek

Cermak²,

Němeček

et al. 2012

Review of Scientific Instruments

View full text Add to dashboard Cite

Investigations of charging processes on a single dust grain under controlled conditions in laboratory experiments are the unique way to understand the behavior of dust grains in complex plasma (in space, in laboratory, or in technological applications). An electrodynamic trap is often utilized for both holding a single grain and continuously measuring its charge-to-mass ratio. We propose a modified design of the linear quadrupole trap with the electrodes split into two parts; each of them being supplied by a designated source. The paper presents basic calculations and the results of the trap prototype tests. These tests have confirmed our expectations and have shown that the suggested solution is fully applicable for the dust charging experiments. The uncertainty of determination of the dust grain charge does not exceed 10(-3). The main advantages of the suggested design in comparison with other traps used for dust investigations can be summarized as: The trap (i) is more opened, thus it is suitable for a simultaneous application of the ion and electron beams and UV source; (ii) facilitates investigations of dust grains in a broader range of parameters; and (iii) allows the grain to move along the axis in a controlled way.

show abstract

Relation of Charging History to Field Ion Emission From Gold and Carbon Dust

Cited by 3 publications

References 17 publications

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

Dusty Plasma Effects in Near Earth Space and Interplanetary Medium

The influence of secondary electron emission on the floating potential of tokamak-born dust

Linear trap with three orthogonal quadrupole fields for dust charging experiments

Contact Info

Product

Resources

About