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Comparing scrape-off layer and divertor physics in JET pure He and D discharges

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Coster,  D.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Eich,  T.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Haas,  G.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Herrmann,  A.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Kallenbach,  A.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

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Wischmeier,  M.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Pitts, R. A., Andrew, P., Andrew, Y., Becoulet, C., Coffey, I., Coster, D., et al. (2003). Comparing scrape-off layer and divertor physics in JET pure He and D discharges. Journal of Nuclear Materials, 313-316, 777-786. doi:10.1016/S0022-3115(02)01429-0.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-234F-D
Abstract
Though helium plasmas are one option for the low activation phase of ITER, little effort has thus far been devoted to studying them in a large, diverted tokamak. A recent campaign on JET has therefore sought to address some of the important questions related to helium operation (He concentrations near 90%) in single null configuruations, particularly with regard to edge and divertor physics. This contribution compiles a selection of results from these experiments, in which, in each case, discharges have been chosen to match as closely as possible previous, well characterised D plasmas in both L and ELMing H-modes. These matched pulses are used to draw conclusions regarding the principle source and location of carbon production in D plasmas, to compare and contrast the mechanisms of the density limit and the detachment process in D and He, to investigate the nature of cross-field power transport in the SOL and to gain insight into the process by which ELM energy is transported to the divertor targets.