Articolo in rivista, 2014, ENG, 10.1016/j.apsusc.2014.06.091
Ghezzi, F.; Caniello, R.; Giubertoni, D.; Bersani, M.; Hakola, A.; Mayer, M.; Rohde, V.; Anderle, M.
[ 1 ] Piero Caldirola IFP Euratom ENEA CNR Assoc, Ist Fis Plasma, I-20125 Milan, Italy; [ 2 ] FBK, I-38123 Povo, TN, Italy; [ 3 ] Assoc Euratom Tekes, VTT, Espoo 02044, Finland; [ 4 ] Max Planck Inst Plasma Phys, D-85748 Garching, Germany; [ 5 ] Knowledge Dept, I-38123 Trento, Italy
We present the results of a study where secondary ion mass spectrometry (SIMS) has been used to obtain depth profiles of deuterium concentration on plasma facing components of the first wall of the ASDEX Upgrade tokamak. The method uses primary and secondary standards to quantify the amount of deuterium retained. Samples of bulk graphite coated with tungsten or tantalum-doped tungsten are independently profiled with three different SIMS instruments. Their deuterium concentration profiles are compared showing good agreement. In order to assess the validity of the method, the integrated deuterium concentrations in the coatings given by one of the SIMS devices is compared with nuclear reaction analysis (NRA) data. Although in the case of tungsten the agreement between NRA and SIMS is satisfactory, for tantalum-doped tungsten samples the discrepancy is significant because of matrix effect induced by tantalum and differently eroded surface (W + Ta always exposed to plasma, W largely shadowed). A further comparison where the SIMS deuterium concentration is obtained by calibrating the measurements against NRA values is also presented. For the tungsten samples, where no Ta induced matrix effects are present, the two methods are almost equivalent. The results presented show the potential of the method provided that the standards used for the calibration reproduce faithfully the matrix nature of the samples. (C) 2014 Elsevier B.V. All rights reserved.
Applied surface science 315 , pp. 459–466
SIMS, Deuterium concentration, Depth profile, Relative sensitivity factor
Caniello Roberto, Ghezzi Francesco Mauro
ID: 316886
Year: 2014
Type: Articolo in rivista
Creation: 2015-02-23 15:05:12.000
Last update: 2020-08-11 15:41:33.000
CNR authors
CNR institutes
EU Projects
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
DOI: 10.1016/j.apsusc.2014.06.091
URL: http://www.sciencedirect.com/science/article/pii/S0169433214013932
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:316886
DOI: 10.1016/j.apsusc.2014.06.091
ISI Web of Science (WOS): 000342360300066
Scopus: 2-s2.0-84922855650