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Proceedings Paper

Laser stimulated grain growth in 304 stainless steel anodes for reduced hydrogen outgassing (Erratum)
Author(s): D. Gortat; M. Sparkes; S. B. Fairchild; P. T. Murray; M. M. Cahay; T. C. Back; G. J. Gruen; N. P. Lockwood; W. O’Neill
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Paper Abstract

Publisher’s Note: This paper, originally published on 2/22/17, was replaced with a corrected/revised version on 5/16/17. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital Library Customer Service for assistance.

Metal anodes in high power source (HPS) devices erode during operation due to hydrogen outgassing and plasma formation; both of which are thermally driven phenomena generated by the electron beam impacting the anode’s surface. This limits the lowest achievable pressure in an HPS device, which reduces its efficiency. Laser surface melting the 304 stainless steel anodes by a continuous wave fiber laser showed a reduction in hydrogen outgassing by a factor of ~4 under 50 keV electron bombardment, compared to that from untreated stainless steel. This is attributed to an increase in the grain size (from 40 - 3516 μm2), which effectively reduces the number of characterized grain boundaries that serve as hydrogen trapping sites, making such laser treated metals excellent candidates for use in vacuum electronics.

Paper Details

Date Published: 22 February 2017
PDF: 7 pages
Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100832E (22 February 2017); doi: 10.1117/12.2252094
Show Author Affiliations
D. Gortat, Univ. of Cambridge (United Kingdom)
M. Sparkes, Univ. of Cambridge (United Kingdom)
S. B. Fairchild, Air Force Research Lab. (United States)
P. T. Murray, Univ. of Dayton Research Institute (United States)
M. M. Cahay, Univ. of Cincinnati (United States)
T. C. Back, Univ. of Dayton Research Institute (United States)
G. J. Gruen, Univ. of Dayton Research Institute (United States)
N. P. Lockwood, Air Force Research Lab. (United States)
W. O’Neill, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 10083:
Fiber Lasers XIV: Technology and Systems
Craig A. Robin; Ingmar Hartl, Editor(s)

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