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Abstract

In order to investigate the hydrogen isotope accumulation at the erosion dominated inner walls of fusion experiments, several small carbon samples have been mounted in the inner wall tiles of the torus of the JET Joint Undertaking. After about 2.5 years of JET operation, including the extended D/T phase and the D/D cleaning phase, the samples have been removed and analysed by RBS, ERDA and AMS. In the near surface region only small T concentrations are measured. A much larger T concentration is found at depths between about 1 and 2Ám. This may originate from energetic (~1 MeV) T which is produced during the D/D discharges and implanted to large depth. The lower energy (keV) T which is implanted during the D/T discharges became effectively removed from the inner wall, by isotope exchange with implanted D or H and/or by erosion of the wall. The total amount of T within a depth of about 2Ám was found to be about 1-3 x 10(13) T /cm(2), while in a surface layer of about 0.5 Ám about 1-3 x 10(12) T /cm2, about 2-4 x 10(16) D/cm2 and about 4-9 x 10(16) H/cm2 were measured.

Additional information

Authors: STAN-SION C, Physik Department E-15, Technische Universitõt M³nchen, Garching (DE);KUBO F, Physik Department E-15, Technische Universitõt M³nchen, Garching (DE);LAZAREV V, Physik Department E-15, Technische Universitõt M³nchen, Garching (DE);NOTLE E, Physik Department E-15, Technische Universitõt M³nchen, Garching (DE);ROHRER L, Physik Department E-15, Technische Universitõt M³nchen, Garching (DE);BEHRISCH R, Max-Planck-Institut f³r Plasmaphysik, EURATOM Association, Garching (DE);LINDIG S, Max-Planck-Institut f³r Plasmaphysik, EURATOM Association, Garching (DE);MAYER M, Max-Planck-Institut f³r Plasmaphysik, EURATOM Association, Garching (DE);ROTH J, Max-Planck-Institut f³r Plasmaphysik, EURATOM Association, Garching (DE);COAD J.P, JET Joint Undertaking, Abingdon, Oxfordshire (UK);PEACOCK A, JET Joint Undertaking, Abingdon, Oxfordshire (UK);KREISSIG U, Institut f³r Ionenstrahlphysik und Materialforschung, Forschungszentrum Rossendorf, Dresden (DE)
Bibliographic Reference: An article published in: Elsevier; Journal of Nuclear Materials, 290-293 (2001) pp.491-495
Availability: An article published in: Elsevier; Journal of Nuclear Materials, 290-293 (2001) pp.491-495
Record Number: 200013447 / Last updated on: 2001-06-27
Category: PUBLICATION
Original language: en
Available languages: en