DIVIMP-B2-EIRENE modelling of 13C migration and deposition in ASDEX Upgrade L-mode plasmas

JOURNAL OF NUCLEAR MATERIALS

卷:396

Article

Xuereb, A.^1,2  Groth, M.¹  Krieger, K.³  Asunta, O.¹  Kurki-Suonio, T.¹  Likonen, J.⁴  Coster, D. P.³ 

[1] Helsinki Univ Technol, Assoc Euratom Tekes, FI-02015 Helsinki, Finland

[2] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[3] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

[4] VTT, Assoc Euratom Tekes, FI-02044 Espoo, Finland

关键词: Carbon impurities;    ASDEX Upgrade;    Edge modeling;    Impurity transport;    DIVIMP;   

DOI  :  10.1016/j.jnucmat.2009.11.014

来源: Elsevier

【 摘 要 】

Carbon transport and migration were studied experimentally and numerically in a high-density, low-confinement mode plasma in the ASDEX Upgrade tokamak. On the last day of plasma operation of the 2004-2005 experimental campaign, (CH4)-C-13 was injected into the vacuum vessel from the low field side midplane. A poloidal set of tiles was subsequently removed and analysed for C-13 deposition. In this work the measured deposition profile is interpreted using the impurity transport code DIVIMP. The simulated poloidal distribution of C-13 deviates significantly from the measured profile. The simulations indicate that C-13 is promptly deposited at the wall in the vicinity of the injection port, and is transported to the low field side divertor plate predominately via the scrape-off layer. The B2-EIRENE plasma solution produce stagnant plasma flow in the main scrape-off layer, in contrast to measurements in ASDEX Upgrade and other tokamaks. This is the likely cause of the discrepancy between the measured and the calculated poloidal distribution of the C-13 deposition. Key model parameters of DIVIMP were varied to determine their effect on the simulated deposition profile. (C) 2009 Elsevier B.V. All rights reserved.

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