Narrow limiter SOL power channels and their impact of ITER first wall shaping

0433684 - ÚFP 2015 US eng A - Abstract
Kocan, M. - Pitts, R.A. - Arnoux, G. - Balboa, I. - Dejarnac, Renaud - Furno, I. - Goldston, R.J. - Horáček, Jan - Komm, Michael - Labit, B. - LaBombard, B. - Lasnier, C.J. - Mitteau, R. - Nespoli, F. - Pace, D. - Pánek, Radomír - Stangeby, P.C. - Terry, J.L. - Theiler, C. - Tsui, C. - Vondráček, Petr - Wolfe, S. … Total 23 authors
Narrow limiter SOL power channels and their impact of ITER first wall shaping.
Bulletin of the American Physical Society. Roč. 59, č. 5 (2014), JI1:00001. ISSN 0003-0503.
[Annual Meeting of the APS Division of Plasma Physics /56./. 27.10.2014-31.10.2014, New Orleans, Louisiana]
Institutional support: RVO:61389021
Keywords : ITER * power flux * limiter * narrow channel
Subject RIV: BL - Plasma and Gas Discharge Physics

Until recently, it was generally accepted that the profile of parallel heat flux density in the SOL of limited tokamak plasmas can be well approximated by a single exponential with decay length.This popular belief was emphatically shown to be erroneous in 2012, when IR measurements on the inner column of JET limiter discharges revealed the presence of a narrow heat flux channel adjacent to the last closed flux surface. This near-SOL decay occurs within ~few mm, much shorter than the main SOL decay length, and can raise the heat flux at the limiter apex a factor 1-4 above the value expected from a single,broad exponential.Alerted by this JET data, the ITER Organization (IO) initiated a multi-machine effort to examine this new physics, with the C-Mod, DIII-D, COMPASS and TCV tokamaks all finding the narrow heat flux channel in dedicated experiments.This paper will describe how these new data are helping to unravel the physics of the narrow feature and how they have provided a strong
Permanent Link: http://hdl.handle.net/11104/0237852