Tungsten impurity transport experiments in Alcator C-Mod to address high priority research and development for ITER
A. Loarte,Matthew Reinke,A. R. Polevoi,M. Hosokawa,M. Chilenski,Nathan Howard,A.E. Hubbard,Jerry Hughes,J. E. Rice,J.R. Walk,Alcator C-Mod Team,F. Köchl,Th. Pütterich,R. Dux,V. E. Zhogolev +14 more
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In this paper, the authors show that anomalous transport dominating tungsten transport in the central region of the Alcator C-Mod tokamak plasmas does not take place in these conditions.Abstract:
Experiments in Alcator C-Mod tokamak plasmas in the Enhanced D-alpha H-mode regime with ITER-like mid-radius plasma density peaking and Ion Cyclotron Resonant heating, in which tungsten is introduced by the laser blow-off technique, have demonstrated that accumulation of tungsten in the central region of the plasma does not take place in these conditions. The measurements obtained are consistent with anomalous transport dominating tungsten transport except in the central region of the plasma where tungsten transport is neoclassical, as previously observed in other devices with dominant neutral beam injection heating, such as JET and ASDEX Upgrade. In contrast to such results, however, the measured scale lengths for plasma temperature and density in the central region of these Alcator C-Mod plasmas, with density profiles relatively flat in the core region due to the lack of core fuelling, are favourable to prevent inter and intra sawtooth tungsten accumulation in this region under dominance of neoclassical...read more
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Journal ArticleDOI
First principle integrated modeling of multi-channel transport including Tungsten in JET
S. Breton,F. J. Casson,Clarisse Bourdelle,Jonathan Citrin,Y. Baranov,Yann Camenen,C. D. Challis,G. Corrigan,J. Garcia,L. Garzotti,S. S. Henderson,F. Koechl,E. Militello-Asp,M. G. O'Mullane,T. Pütterich,M. Sertoli,M. Valisa +16 more
TL;DR: For the first time, over five confinement times, the selfconsistent flux driven time evolution of heat, momentum transport and particle fluxes of electrons and multiple ions including Tungsten (W) was observed as discussed by the authors.
Journal ArticleDOI
A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak
Ling Zhang,Shigeru Morita,Zhenwei Wu,Z. Xu,X.T. Yang,X.T. Yang,Y. D. Cheng,Y. D. Cheng,Qing Zang,Haiqing Liu,Yong Liu,Hongming Zhang,Tetsutarou Ohishi,Yingjie Chen,Liqing Xu,C. R. Wu,C. R. Wu,Yanmin Duan,Wei Gao,Juan Huang,Xianzu Gong,Liqun Hu +21 more
TL;DR: In this paper, a space-resolved spectrometer working at 30-520 A has been developed to measure a radial profile of the tungsten line emission in long-pulse H-mode discharges.
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