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Laser annealing in combination with mass spectroscopy, a technique to study deuterium on tokamak carbon samples, a tool for detritiation
KTH, School of Information and Communication Technology (ICT), Material Physics.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2006 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 359, no 3, 220-226 p.Article in journal (Refereed) Published
Abstract [en]

In this study, a method is presented based on mass spectroscopy to measure the a real density of deuterium on a graphite surface exposed to tokamak discharges. The studied sample was cut from a bumper limiter exposed in the TEXTOR tokamak and annealed by a 1 J Excimer laser (KrF). The energy used was 400 mJ cm(-2), which is below the threshold for ablation. 1 J cm(-2). The release of HD and D, was measured by a mass spectroscopy set-up and no other species released from the sample were detected in this experiment. The amount of D released from the sample after 20 laser pulses was measured to 7 x 10(16) D atoms per cm(-2) (for this particular sample) and most of the hydrogen at the surface was released in the first pulse, as checked by nuclear reaction analysis (NRA) techniques, which gave changes of the amount of deuterium before and after laser annealing. The sensitivity in this experiment was 5 x 10(14) atoms per cm(-2) for HD and 5 x 10(13) atoms per cm(-2) for D-2.

Place, publisher, year, edition, pages
2006. Vol. 359, no 3, 220-226 p.
Keyword [en]
oxygen-exchange, o-2/h2o-gas mixtures, excimer-laser, hydrogen, removal, release, tritium, tiles, transport, oxidation
URN: urn:nbn:se:kth:diva-16229DOI: 10.1016/j.jnucmat.2006.09.001ISI: 000243144000008ScopusID: 2-s2.0-33751336607OAI: diva2:334271
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Åkermark, TorbjörnEmmoth, BirgerBergsåker, Henric
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