Tungsten transport and sources control in JET ITER-like wall H-mode plasmas

被引：33
|
作者：
Fedorczak, N. [2 ]
Monier-Garbet, P. [2 ]
Puetterich, T. [9 ]
Brezinsek, S. [3 ]
Devynck, P. [2 ]
Dumont, R. [2 ]
Goniche, M. [2 ]
Joffrin, E. [2 ]
Lerche, E. [4 ,5 ]
Lipschultz, B. [6 ]
de la Luna, E. [7 ]
Maddison, G. [8 ]
Maggi, C. [9 ]
Matthews, G. [8 ]
Nunes, I. [10 ]
Rimini, F. [8 ]
Solano, E. R. [7 ]
Tamain, P. [2 ]
Tsalas, M. [11 ]
de Vries, P. [12 ]
机构：
[1] Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England
[2] CEA, IRFM, F-13108 St Paul Les Durance, France
[3] Forschungszentrum Jlich, Assoc EURATOM FZJ, Inst Energy & Climate Res, Julich, Germany
[4] Assoc EURATOM Belgian State, LPP ERM KMS, TEC Partner, Brussels, Belgium
[5] Euratom CCFE Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
[6] Univ York, York Plasma Inst, York YO10 5DD, N Yorkshire, England
[7] Asociacin EURATOM CIEMAT, Lab Nacl Fusin, Madrid 28040, Spain
[8] EURATOM CCFE Assoc, Culham Ctr Fus Energy, Abingdon, Oxon, England
[9] EURATOM, MPI Plasmaphys, D-85748 Garching, Germany
[10] Ist Plasmas & Fusao Nucl, Lisbon, Portugal
[11] NCSR Demokritos, Assoc EURATOM Hellen Republ, Attica 15310, Greece
[12] ITER Org, F-13115 St Paul Les Durance, France
来源：
JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷
基金：
英国工程与自然科学研究理事会;
关键词：
PARTICLE LOSSES; DIVERTOR; EROSION; ENERGY;
D O I：
10.1016/j.jnucmat.2014.12.044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A set of discharges performed with the JET ITER-like wall is investigated with respect to control capabilities on tungsten sources and transport. In attached divertor regimes, increasing fueling by gas puff results in higher divertor recycling ion flux, lower divertor tungsten source, higher ELM frequency and lower core plasma radiation, dominated by tungsten ions. Both pedestal flushing by ELMs and divertor screening (including redeposition) are possibly responsible. For specific scenarios, kicks in plasma vertical position can be employed to increase the ELM frequency, which results in slightly lower core radiation. The application of ion cyclotron radio frequency heating at the very center of the plasma is efficient to increase the core electron temperature gradient and flatten electron density profile, resulting in a significantly lower central tungsten peaking. Beryllium evaporation in the main chamber did not reduce the local divertor tungsten source whereas core radiation was reduced by approximately 50%. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：85 / 90
页数：6
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