Initial results of tests of depth markers as a surface diagnostic for fusion devices
The Accelerator-Based In Situ Materials Surveillance (AIMS) diagnostic was developed to perform in situ ion beam analysis (IBA) on Alcator C-Mod in August 2012 to study divertor surfaces between shots. These results were limited to studying low-Z surface properties, because the Coulomb barrier precl...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
Elsevier
2018
|
| Online Access: | http://hdl.handle.net/1721.1/117037 https://orcid.org/0000-0001-5859-7872 https://orcid.org/0000-0002-2110-6766 https://orcid.org/0000-0002-9001-5606 |
| _version_ | 1810990893993295872 |
|---|---|
| author | Hartwig, Z. S. Wright, G. M. Kesler, Leigh Ann Sorbom, Brandon Nils Barnard, Harold Salvadore Whyte, Dennis G |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Hartwig, Z. S. Wright, G. M. Kesler, Leigh Ann Sorbom, Brandon Nils Barnard, Harold Salvadore Whyte, Dennis G |
| author_sort | Hartwig, Z. S. |
| collection | MIT |
| description | The Accelerator-Based In Situ Materials Surveillance (AIMS) diagnostic was developed to perform in situ ion beam analysis (IBA) on Alcator C-Mod in August 2012 to study divertor surfaces between shots. These results were limited to studying low-Z surface properties, because the Coulomb barrier precludes nuclear reactions between high-Z elements and the ∼1 MeV AIMS deuteron beam. In order to measure the high-Z erosion, a technique using deuteron-induced gamma emission and a low-Z depth marker is being developed. To determine the depth of the marker while eliminating some uncertainty due to beam and detector parameters, the energy dependence of the ratio of two gamma yields produced from the same depth marker will be used to determine the ion beam energy loss in the surface, and thus the thickness of the high-Z surface. This paper presents the results of initial trials of using an implanted depth marker layer with a deuteron beam and the method of ratios. First tests of a lithium depth marker proved unsuccessful due to the production of conflicting gamma peaks, among other issues. However, successful trials with a boron depth marker show that it is possible to measure the depth of the marker layer with the method of gamma yield ratios. |
| first_indexed | 2024-09-23T12:45:02Z |
| format | Article |
| id | mit-1721.1/117037 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:45:02Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1170372022-09-28T09:51:50Z Initial results of tests of depth markers as a surface diagnostic for fusion devices Hartwig, Z. S. Wright, G. M. Kesler, Leigh Ann Sorbom, Brandon Nils Barnard, Harold Salvadore Whyte, Dennis G Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Kesler, Leigh Ann Sorbom, Brandon Nils Barnard, Harold Salvadore Whyte, Dennis G The Accelerator-Based In Situ Materials Surveillance (AIMS) diagnostic was developed to perform in situ ion beam analysis (IBA) on Alcator C-Mod in August 2012 to study divertor surfaces between shots. These results were limited to studying low-Z surface properties, because the Coulomb barrier precludes nuclear reactions between high-Z elements and the ∼1 MeV AIMS deuteron beam. In order to measure the high-Z erosion, a technique using deuteron-induced gamma emission and a low-Z depth marker is being developed. To determine the depth of the marker while eliminating some uncertainty due to beam and detector parameters, the energy dependence of the ratio of two gamma yields produced from the same depth marker will be used to determine the ion beam energy loss in the surface, and thus the thickness of the high-Z surface. This paper presents the results of initial trials of using an implanted depth marker layer with a deuteron beam and the method of ratios. First tests of a lithium depth marker proved unsuccessful due to the production of conflicting gamma peaks, among other issues. However, successful trials with a boron depth marker show that it is possible to measure the depth of the marker layer with the method of gamma yield ratios. United States. Department of Energy. (grant number DE-FG02-94ER54235, cooperative agreement number DEFC02-99ER54512) 2018-07-20T19:35:28Z 2018-07-20T19:35:28Z 2016-12 2016-10 2018-07-17T17:02:41Z Article http://purl.org/eprint/type/JournalArticle 2352-1791 http://hdl.handle.net/1721.1/117037 Kesler, L.A., B.N. Sorbom, Z.S. Hartwig, H.S. Barnard, G.M. Wright, and D.G. Whyte. “Initial Results of Tests of Depth Markers as a Surface Diagnostic for Fusion Devices.” Nuclear Materials and Energy 12 (August 2017): 1277–1281. © 2016 Published by Elsevier Ltd. https://orcid.org/0000-0001-5859-7872 https://orcid.org/0000-0002-2110-6766 https://orcid.org/0000-0002-9001-5606 http://dx.doi.org/10.1016/J.NME.2016.11.013 Nuclear Materials and Energy Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Elsevier |
| spellingShingle | Hartwig, Z. S. Wright, G. M. Kesler, Leigh Ann Sorbom, Brandon Nils Barnard, Harold Salvadore Whyte, Dennis G Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title | Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title_full | Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title_fullStr | Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title_full_unstemmed | Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title_short | Initial results of tests of depth markers as a surface diagnostic for fusion devices |
| title_sort | initial results of tests of depth markers as a surface diagnostic for fusion devices |
| url | http://hdl.handle.net/1721.1/117037 https://orcid.org/0000-0001-5859-7872 https://orcid.org/0000-0002-2110-6766 https://orcid.org/0000-0002-9001-5606 |
| work_keys_str_mv | AT hartwigzs initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices AT wrightgm initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices AT keslerleighann initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices AT sorbombrandonnils initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices AT barnardharoldsalvadore initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices AT whytedennisg initialresultsoftestsofdepthmarkersasasurfacediagnosticforfusiondevices |