This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1016/j.nme.2019.04.007 in citations.
Please use the identifier: http://hdl.handle.net/2128/22566 in citations.
Laser-Induced Desorption of co-deposited Deuterium in Beryllium Layers on Tungsten
Laser-Induced Desorption of co-deposited Deuterium in Beryllium Layers on Tungsten
For the development of the tritium monitoring system in ITER the hydrogen isotope release by Laser-Induced Desorption (LID) from Be layers is studied to determine the laser parameters for a high desorption efficiency while minimising dust production and surface modifications is also pursued. Be laye...
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Personal Name(s): | Zlobinski, M. (Corresponding author) |
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Sergienko, G. / Martynova, Y. / Matveev, D. / Unterberg, B. / Brezinsek, S. / Spilker, B. / Nicolai, D. / Rasinski, M. / Möller, S. / Linsmeier, Ch. / Lungu, C. P. / Porosnicu, C. / Dinca, P. / De Temmerman, G. | |
Contributing Institute: |
Werkstoffstruktur und -eigenschaften; IEK-2 Werkstoffsynthese und Herstellungsverfahren; IEK-1 Plasmaphysik; IEK-4 |
Published in: | Nuclear materials and energy, 19 (2019) S. 503 - 509 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2019
|
DOI: |
10.1016/j.nme.2019.04.007 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/22566 in citations.
For the development of the tritium monitoring system in ITER the hydrogen isotope release by Laser-Induced Desorption (LID) from Be layers is studied to determine the laser parameters for a high desorption efficiency while minimising dust production and surface modifications is also pursued. Be layers of 1 µm thickness with 25–30 at% D and 3 × 1022 D/m2 comparable to JET-ILW areal concentrations [1] have been produced by High Power Impulse Magnetron Sputtering (HiPIMS) on ITER grade W. Laser pulses of 1, 5 and 10 ms duration heat the layer in vacuum in the Fuel REtention DIagnostic Setup (FREDIS) and release the retained D thermally. By mass spectrometry in FREDIS and subsequent Nuclear Reaction Analysis (NRA) inside the laser spot the desorbed and remaining D is quantified. While a pulse duration of 1 ms cannot fully desorb the deuterium, it is found that a single 5 or 10 ms laser pulse with an absorbed energy density of ca. 1.5 MJ/m2 corresponding to a heat flux factor around 20 MW√s/m2 leads to nearly complete desorption of the retained D. This encourages the development of a useful tritium monitoring system, although the present layers produce some dust due to local delamination of the layer on at least 11% of the heated surface (at 1.4 MJ/m2 absorbed energy within 5 ms) and lead to unavoidable crack formation. |