A digital holography ex situ measurement characterization of plasma-exposed surface erosion from an electrothermal arc source
Abstract
Digital holography has been proposed to fulfill a need for an imaging diagnostic capable of in situ monitoring of surface erosion caused by plasma–material interaction in nuclear fusion devices. A digital holography diagnostic for 3D surface erosion measurement has been developed at Oak Ridge National Laboratory with the goal of deployment on a plasma device. A proof-of-concept in situ demonstration is planned which would involve measurement of plasma erosion on targets exposed to an electrothermal arc source. This work presents the results of an ex situ characterization of the capability and limitations of holographic imaging of targets exposed to the arc source. Targets were designed to provide a fiducial for comparison of deformed and unaffected areas. The results indicated that the average net erosion was ~150 nm/plasma exposure, which is expected to be within the diagnostic’s measurement capacity. Surface roughness averages determined by holographic image analysis showed good agreement with measurements taken with a profilometer. Finally, the limit of the holography diagnostic’s x–y spatial resolution was characterized by comparison with scanning electron microscope imaging.
- Authors:
-
[2];
[2];
[3]
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Third Dimension Technologies, Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1771885
- Alternate Identifier(s):
- OSTI ID: 1769446
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; Plasma material interactions; Optical imaging; Measuring instruments; Digital holography; Scanning electron microscopy; Plasma devices; Profilometry; Nuclear fusion; Measurement theory
Citation Formats
Smith, Cary D., Biewer, Theodore M., Gebhart, III, Trey, Echols, John, and Thomas, Jr., C. E. A digital holography ex situ measurement characterization of plasma-exposed surface erosion from an electrothermal arc source. United States: N. p., 2021.
Web. doi:10.1063/5.0041279.
Smith, Cary D., Biewer, Theodore M., Gebhart, III, Trey, Echols, John, & Thomas, Jr., C. E. A digital holography ex situ measurement characterization of plasma-exposed surface erosion from an electrothermal arc source. United States. https://doi.org/10.1063/5.0041279
Smith, Cary D., Biewer, Theodore M., Gebhart, III, Trey, Echols, John, and Thomas, Jr., C. E. Fri .
"A digital holography ex situ measurement characterization of plasma-exposed surface erosion from an electrothermal arc source". United States. https://doi.org/10.1063/5.0041279. https://www.osti.gov/servlets/purl/1771885.
@article{osti_1771885,
title = {A digital holography ex situ measurement characterization of plasma-exposed surface erosion from an electrothermal arc source},
author = {Smith, Cary D. and Biewer, Theodore M. and Gebhart, III, Trey and Echols, John and Thomas, Jr., C. E.},
abstractNote = {Digital holography has been proposed to fulfill a need for an imaging diagnostic capable of in situ monitoring of surface erosion caused by plasma–material interaction in nuclear fusion devices. A digital holography diagnostic for 3D surface erosion measurement has been developed at Oak Ridge National Laboratory with the goal of deployment on a plasma device. A proof-of-concept in situ demonstration is planned which would involve measurement of plasma erosion on targets exposed to an electrothermal arc source. This work presents the results of an ex situ characterization of the capability and limitations of holographic imaging of targets exposed to the arc source. Targets were designed to provide a fiducial for comparison of deformed and unaffected areas. The results indicated that the average net erosion was ~150 nm/plasma exposure, which is expected to be within the diagnostic’s measurement capacity. Surface roughness averages determined by holographic image analysis showed good agreement with measurements taken with a profilometer. Finally, the limit of the holography diagnostic’s x–y spatial resolution was characterized by comparison with scanning electron microscope imaging.},
doi = {10.1063/5.0041279},
journal = {Review of Scientific Instruments},
number = 3,
volume = 92,
place = {United States},
year = {Fri Mar 05 00:00:00 EST 2021},
month = {Fri Mar 05 00:00:00 EST 2021}
}
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