This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1016/j.jnucmat.2013.01.053 in citations.
Tungsten migration studies by controlled injection of volatile compounds
Tungsten migration studies by controlled injection of volatile compounds
Volatile tungsten hexa-fluoride was locally injected into the TEXTOR tokamak as a marker for material migration studies. The injection was accompanied by puffing N-15 rare isotope as a nitrogen tracer in discharges with edge cooling by impurity seeding. The objective was to assess material balance b...
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Personal Name(s): | Rubel, M. (Corresponding Author) |
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Coenen, J. / Ivanova, D. / Möller, S. / Petersson, P. / Brezinsek, S. / Kreter, A. / Philipps, V. / Pospieszczyk, A. / Schweer, B. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Journal of nuclear materials, 438 (2013) S. S170 - S174 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2013
|
DOI: |
10.1016/j.jnucmat.2013.01.053 |
Document Type: |
Journal Article |
Research Program: |
Plasma-wall interactions |
Publikationsportal JuSER |
Volatile tungsten hexa-fluoride was locally injected into the TEXTOR tokamak as a marker for material migration studies. The injection was accompanied by puffing N-15 rare isotope as a nitrogen tracer in discharges with edge cooling by impurity seeding. The objective was to assess material balance by qualitative and quantitative determination of a global and local deposition pattern, material mixing effects and fluorine residence in plasma-facing components. Spectroscopy and ex situ ion beam analysis techniques were used. Tungsten was detected on all types of limiter tiles and short-term probes retrieved from the vessel. Over 80% of the injected W was identified. The largest tungsten concentration, 1 × 1018 cm−2, was in the vicinity of the gas inlet. Co-deposits contained tungsten and a mix of light isotopes: H, D, He-4, B-10, B-11, C-12, C-13, N-14, N-15, O-16 and small quantities of F-19 thus showing that both He and nitrogen are trapped following wall conditioning (He glow) and edge cooling. |