Secondary Emission From Clusters Composed of Spherical Grains

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10334190" target="_blank" >RIV/00216208:11320/16:10334190 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1109/TPS.2015.2509238" target="_blank" >http://dx.doi.org/10.1109/TPS.2015.2509238</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TPS.2015.2509238" target="_blank" >10.1109/TPS.2015.2509238</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Secondary Emission From Clusters Composed of Spherical Grains

Popis výsledku v původním jazyce

Dust grains or their clusters can be frequently found in many space environments-interstellar clouds, atmospheres of planets, tails of comets, or planetary rings are only typical examples. Space dust grains are formed by various processes and their shapes are complex. These grains are exposed to electrons with different energies, and thus, they can acquire positive or negative charge during this interaction. We present a systematic study of well-defined systems-clusters consisting of different numbers of small spherical (1 mu m) grains and such objects can be considered as examples of real irregularly shaped space grains. The charges acquired by investigated objects as well as their secondary emission yields are calculated using the secondary emission model. We have found that: 1) the charge and surface potential of clusters exposed to the electron beam are influenced by the number of grains and by their geometry within a particular cluster; 2) the model results are in an excellent agreement with the experiment; and 3) there is a large difference between charging of a cluster levitating in the free space and that attached to a planar surface. The calculation provides a reduction of the secondary electron emission yield of the surface covered by dust clusters by a factor of 1.5 with respect to the yield of a smooth surface.

Název v anglickém jazyce

Secondary Emission From Clusters Composed of Spherical Grains

Popis výsledku anglicky

Dust grains or their clusters can be frequently found in many space environments-interstellar clouds, atmospheres of planets, tails of comets, or planetary rings are only typical examples. Space dust grains are formed by various processes and their shapes are complex. These grains are exposed to electrons with different energies, and thus, they can acquire positive or negative charge during this interaction. We present a systematic study of well-defined systems-clusters consisting of different numbers of small spherical (1 mu m) grains and such objects can be considered as examples of real irregularly shaped space grains. The charges acquired by investigated objects as well as their secondary emission yields are calculated using the secondary emission model. We have found that: 1) the charge and surface potential of clusters exposed to the electron beam are influenced by the number of grains and by their geometry within a particular cluster; 2) the model results are in an excellent agreement with the experiment; and 3) there is a large difference between charging of a cluster levitating in the free space and that attached to a planar surface. The calculation provides a reduction of the secondary electron emission yield of the surface covered by dust clusters by a factor of 1.5 with respect to the yield of a smooth surface.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

IEEE Transactions on Plasma Science

ISSN

0093-3813

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

505-511

Kód UT WoS článku

000374162900012

EID výsledku v databázi Scopus

2-s2.0-84953297929