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Erosion at the JET vessel walls has been investigated by means of carbon long term samples (LTS), partly covered with 530 nm A1 and 750 nm Ni as well as implanted with Mo markets in a depth of 380 nm. The samples were exposed to JET plasmas between April-June 1995 (about 940 discharges). Upon removal, the surface layers of the LTS were analyzed with MeV ion bean techniques. On the inner torus walls, net erosion is found with an average of about 1.2E15 Al-atoms/cm{2} and 9.4E14 Ni-atoms/cm{2} per JET discharge, respectively. The erosion of carbon was 3.9E15 C-atoms/cm{2} per JET discharge. The erosion is due to sputtering by energetic charge-exchange neutrals emitted from the plasma during the discharge and He glow discharge cleaning between the discharges.

Additional information

Authors: MAYER M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);BEHRISCH R, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ANDREW P, JET Joint Undertaking, Abingdon, Oxon (GB);PEACOCK A T, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 214-243 (1997) pp. 469-475
Record Number: 199711469 / Last updated on: 1997-11-18
Original language: en
Available languages: en
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