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Abstract

Plasma facing components for ITER will be manufactured as macro brush structures or with castellated surfaces. Material samples with gaps of similar geometry as intended for ITER were exposed to different plasma conditions in TEXTOR, DIII-D and ASDEX Upgrade. In all devices a decrease of both carbon and deuterium inventories at the side faces from the gap entrance into the gap with scale-lengths in the mm range is found. The fraction of D retained at the gap surfaces is in the range of 0.4-4% of the incident flux. Main parameters determining the retained D-fraction are the temperature of the respective surfaces and the carbon fraction in the incident flux. Extrapolation of tritium inventory growth rates to ITER dimensions assuming the measured retention fractions at T > 200 Degree Celsius and using a D/T-flux distribution with a carbon fraction of approximately 1% from B2/EIRENE simulations of an ITER H-mode discharge yields a contribution to the increase of the total in-vessel tritium inventory in the range of 0.5-5 g T/discharge.

Additional information

Authors: KRIEGER K, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);JACOB W, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);MAIER H, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);ROHDE V, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);RUDAKOV D L, University of California, San Diego (US);BASTASZ R, Sandia National Laboratories, Livermore (US);WHALEY J, Sandia National Laboratories, Livermore (US);FEDERICI G, ITER Garching Joint Work Site, Garching (DE);STROHMAYER G, ITER Garching Joint Work Site, Garching (DE);LITNOVSKY A, Institut für Plasmaphysik, Association EURATOM, Jülich (DE);WEST W P, General Atomics, San Diego (US);WONG C P C, General Atomics, San Diego (US)
Bibliographic Reference: An article published in: Journal of Nuclear Materials (2007), online edition
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.sciencedirect.com/science/journal/00223115
Record Number: 200718987 / Last updated on: 2007-03-26
Category: PUBLICATION
Original language: en
Available languages: en
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