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Title: Modeling of reduced secondary electron emission yield from a foam or fuzz surface

Abstract

Complex structures on a material surface can significantly reduce the total secondary electron emission yield from that surface. A foam or fuzz is a solid surface above which is placed a layer of isotropically aligned whiskers. Primary electrons that penetrate into this layer produce secondary electrons that become trapped and do not escape into the bulk plasma. In this manner the secondary electron yield (SEY) may be reduced. We developed an analytic model and conducted numerical simulations of secondary electron emission from a foam to determine the extent of SEY reduction. We find that the relevant condition for SEY minimization is $$\bar{u}$$≡AD/2>>1 while D <<1, where D is the volume fill fraction and A is the aspect ratio of the whisker layer, the ratio of the thickness of the layer to the radius of the fibers. As a result, we find that foam cannot reduce the SEY from a surface to less than 0.3 of its flat value.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1419780
Alternate Identifier(s):
OSTI ID: 1416456
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 2; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Swanson, Charles, and Kaganovich, Igor D. Modeling of reduced secondary electron emission yield from a foam or fuzz surface. United States: N. p., 2018. Web. doi:10.1063/1.5008261.
Swanson, Charles, & Kaganovich, Igor D. Modeling of reduced secondary electron emission yield from a foam or fuzz surface. United States. doi:10.1063/1.5008261.
Swanson, Charles, and Kaganovich, Igor D. Wed . "Modeling of reduced secondary electron emission yield from a foam or fuzz surface". United States. doi:10.1063/1.5008261. https://www.osti.gov/servlets/purl/1419780.
@article{osti_1419780,
title = {Modeling of reduced secondary electron emission yield from a foam or fuzz surface},
author = {Swanson, Charles and Kaganovich, Igor D.},
abstractNote = {Complex structures on a material surface can significantly reduce the total secondary electron emission yield from that surface. A foam or fuzz is a solid surface above which is placed a layer of isotropically aligned whiskers. Primary electrons that penetrate into this layer produce secondary electrons that become trapped and do not escape into the bulk plasma. In this manner the secondary electron yield (SEY) may be reduced. We developed an analytic model and conducted numerical simulations of secondary electron emission from a foam to determine the extent of SEY reduction. We find that the relevant condition for SEY minimization is $\bar{u}$≡AD/2>>1 while D <<1, where D is the volume fill fraction and A is the aspect ratio of the whisker layer, the ratio of the thickness of the layer to the radius of the fibers. As a result, we find that foam cannot reduce the SEY from a surface to less than 0.3 of its flat value.},
doi = {10.1063/1.5008261},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 2,
volume = 123,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: Rendering of an example of the foam surface used in this paper. This foam had 80 bers of radius 0.01 in a height of 1, giving it A = 10; D = 4.3%; $\bar{u}$ = 2.2 This is a dense foam.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.