Title: Measurements of dynamic surface changes by digital holography for in situ plasma erosion applications

Abstract

There are currently few viable diagnostic techniques for in situ measurement of plasma facing component erosion. Digital holography is intended to fill this gap. Progress on the development of single and dual CO2 laser digital holography diagnostics for in situ plasma facing component erosion is discussed. The dual laser mode’s synthetic wavelength allows the measurable range to be expanded by a factor of ∼400 compared to single laser digital holography. This allows the diagnostic to measure surface height changes of up to 4.5 μm in single laser mode and up to 2 mm in dual laser mode. Results include ex situ measurements of plasma eroded targets and also dynamic measurements of nm and μm scale motion of a target mounted on a precision translation stage. Dynamic measurements have successfully been made with the system operating in both single and dual laser modes, from ∼50 nm to ∼4 μm in single laser mode and up to ∼400 μm in dual laser mode (limited only by the stage speed and camera acquisition duration). These results demonstrate the feasibility of using digital holography to characterize plasma facing component erosion dynamically, i.e., during plasma exposure. Results of proof-of-principle in situ digital holographic measurements ofmore » targets exposed to an electrothermal arc plasma source are presented.« less

Authors:

Smith, C. D. ;

• Search DOE PAGES for author "Smith, C. D."
• Search DOE PAGES for ORCID "0000-0002-3225-5417"

Biewer, T. M. ;

• Search DOE PAGES for author "Biewer, T. M."
• Search DOE PAGES for ORCID "0000-0001-7456-3509"

Gebhart, T. E. ;

• Search DOE PAGES for author "Gebhart, T. E."
• Search DOE PAGES for ORCID "0000-0001-8259-6095"

Lindquist, E. G. ;

• Search DOE PAGES for author "Lindquist, E. G."
• Search DOE PAGES for ORCID "0000-0002-1407-4890"

Thomas, C. E.

• Search DOE PAGES for author "Thomas, C. E."
• Search DOE PAGES for ORCID "0000-0001-5706-3940"

Publication Date:

Mon Mar 01 00:00:00 EST 2021

Sponsoring Org.:

USDOE

OSTI Identifier:

1768647

Grant/Contract Number:  

AC05-00OR22725

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Review of Scientific Instruments

Additional Journal Information:

Journal Name: Review of Scientific Instruments Journal Volume: 92 Journal Issue: 3; Journal ID: ISSN 0034-6748

Publisher:

American Institute of Physics

Country of Publication:

United States

Language:

English