Determination of Be sputtering yields from spectroscopic observations at the JET ILW based on 3D ERO modelling

D. Borodin, M.F. Stamp, S. Brezinsek, C. Björkas, J. Miettunen, A. Kirschner, D. Matveev, M. Groth, Markus Airila, S. Lisgo, S. Marsen, V. Philipps, JET-EFDA contributors

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    Abstract

    Estimations of the ITER first wall (FW) lifetime, previously made using the three-dimensional Monte-Carlo ERO code (Borodin et al 2011 Phys. Scr. T145 014008), depend strongly on the assumptions of the physical sputtering yield for beryllium (Be). It is of importance to validate the respective model and data at existing devices including the JET ITER-like wall (ILW) as most ITER-relevant experiments. Applying the same sputtering input data in ERO as those used before in the ITER-predictions, the ERO simulations for the Be light intensity (using up to date atomic data from ADAS and measured plasma conditions) reveal a factor of 2 overestimation in the assumed yield even if the low estimate assuming 50% D surface content is used. This result indicates the preference of this assumption for plasma-wetted areas. It points to a possible necessity to correct (reduce) the respective estimates for the Be sputtering yield and, accordingly, re-visit the ITER FW lifetime predictions.
    Original languageEnglish
    Article number014057
    Number of pages6
    JournalPhysica Scripta
    Issue numberT159
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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    Borodin, D., Stamp, M. F., Brezinsek, S., Björkas, C., Miettunen, J., Kirschner, A., Matveev, D., Groth, M., Airila, M., Lisgo, S., Marsen, S., Philipps, V., & contributors, JET-EFDA. (2014). Determination of Be sputtering yields from spectroscopic observations at the JET ILW based on 3D ERO modelling. Physica Scripta, (T159), [014057]. https://doi.org/10.1088/0031-8949/2014/T159/014057