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...

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Main Authors:	L.A. Kesler, B.N. Sorbom, Z.S. Hartwig, H.S. Barnard, G.M. Wright, D.G. Whyte
Format:	Article
Language:	English
Published:	Elsevier 2017-08-01
Series:	Nuclear Materials and Energy
Online Access:	http://www.sciencedirect.com/science/article/pii/S2352179116300345

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spelling	doaj-a05921bf0f1c4b51831db27411db80182020-11-24T23:39:16ZengElsevierNuclear Materials and Energy2352-17912017-08-011212771281Initial results of tests of depth markers as a surface diagnostic for fusion devicesL.A. Kesler0B.N. Sorbom1Z.S. Hartwig2H.S. Barnard3G.M. Wright4D.G. Whyte5Corresponding author.; Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USADepartment of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USAPlasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USADepartment of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAPlasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USADepartment of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, 02139, USAThe 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. Keywords: Ion beam analysis, In situ diagnostic, AIMS, Depth marker, High-Z erosionhttp://www.sciencedirect.com/science/article/pii/S2352179116300345
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	L.A. Kesler B.N. Sorbom Z.S. Hartwig H.S. Barnard G.M. Wright D.G. Whyte
spellingShingle	L.A. Kesler B.N. Sorbom Z.S. Hartwig H.S. Barnard G.M. Wright D.G. Whyte Initial results of tests of depth markers as a surface diagnostic for fusion devices Nuclear Materials and Energy
author_facet	L.A. Kesler B.N. Sorbom Z.S. Hartwig H.S. Barnard G.M. Wright D.G. Whyte
author_sort	L.A. Kesler
title	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_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_sort	initial results of tests of depth markers as a surface diagnostic for fusion devices
publisher	Elsevier
series	Nuclear Materials and Energy
issn	2352-1791
publishDate	2017-08-01
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. Keywords: Ion beam analysis, In situ diagnostic, AIMS, Depth marker, High-Z erosion
url	http://www.sciencedirect.com/science/article/pii/S2352179116300345
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Initial results of tests of depth markers as a surface diagnostic for fusion devices

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