Studies of impurity migration in TEXTOR by local tracer injection

A. Kirschner, P. Wienhold, D. Borodin, C. Björkas, O. Van Hoey, D. Matveev, S. Brezinsek, A. Kreter, M. Laengner, K. Ohya, V. Philipps, A. Pospieszczyk, U. Samm, B. Schweer

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Tracer experiments have been carried out by injection 13C marked methane through test limiters exposed to the scrape-off-layer in TEXTOR. The influence of impact energy and flux on depositing 13C species has been studied. One experiment has been performed with biased test limiter (-300 V) in order to increase energy of positively charged ions and the other one with 10 times reduced 13CH4 injection rate compared to previously used injection rate. Biasing of the test limiter increases the resulting 13C deposition by a factor of ∼6 - post-mortem analysis yields a 13C deposition efficiency of ∼1.7% compared to ∼0.3% without biasing. Reducing the injection rate increases 13C deposition efficiency to ∼0.7%, which is more than two times larger compared to experiments with previously used injection rate. ERO modelling shows that enhanced re-erosion of redeposits is still necessary to reproduce measured 13C deposition efficiencies.

Original languageEnglish
Pages (from-to)S723-S726
JournalJournal of Nuclear Materials
Volume438
Issue numberSUPPL
DOIs
StatePublished - 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work, supported by the European Communities under the contract of Association between EURATOM/FZJ, was carried out within the framework of EFDA. The views and opinions expressed herein do not necessarily reflect those of the European Commission. CPU time for computations has been provided by JSC (Jülich Supercomputer Centre).

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