Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on B T

M. Schmidtmayr; J. W. Hughes; F. Ryter; E. Wolfrum; N. Cao; A. J. Creely; N. Howard; A. E. Hubbard; Y. Lin; M. L. Reinke; J. E. Rice; E. A. Tolman; S. Wukitch; Y. Ma; ASDEX Upgrade Team

doi:10.1088/1741-4326/aaaed0

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Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on B T

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Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on B T

M. Schmidtmayr, J. W. Hughes, F. Ryter, E. Wolfrum, N. Cao, A. J. Creely, N. Howard, A. E. Hubbard, Y. Lin, M. L. Reinke, …

Nuclear fusion, Vol.58(5), p.56003

05/01/2018

DOI: 10.1088/1741-4326/aaaed0

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https://www.osti.gov/servlets/purl/1895310View

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Abstract

This paper presents investigations on the role of the edge ion heat flux for transitions from L-mode to H-mode in Alcator C-Mod. Previous results from the ASDEX Upgrade tokamak indicated that a critical value of edge ion heat flux per particle is needed for the transition. Analysis of C-Mod data confirms this result. The edge ion heat flux is indeed found to increase linearly with density at given magnetic field and plasma current. Furthermore, the Alcator C-Mod data indicate that the edge ion heat flux at the L-H transition also increases with magnetic field. Combining the data from Alcator C-Mod and ASDEX Upgrade yields a general expression for the edge ion heat flux at the L-H transition. These results are discussed from the point of view of the possible physics mechanism of the L-H transition. They are also compared to the L-H power threshold scaling and an extrapolation for ITER is given.

Alcator C-Mod

L-H transition

power threshold

Details

Title: Subtitle: Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on B T
Creators: M. Schmidtmayr - TU Wien
J. W. Hughes - Massachusetts Institute of Technology
F. Ryter - Max Planck Institute for Plasma Physics
E. Wolfrum - Max Planck Institute for Plasma Physics
N. Cao - Fusion Academy
A. J. Creely - Massachusetts Institute of Technology
N. Howard - Fusion Academy
A. E. Hubbard - Massachusetts Institute of Technology
Y. Lin - Fusion Academy
M. L. Reinke - Oak Ridge National Laboratory
J. E. Rice - Fusion Academy
E. A. Tolman - Fusion (United States)
S. Wukitch - Massachusetts Institute of Technology
Y. Ma - Nashotah House Theological Seminary
ASDEX Upgrade Team
Resource Type: Journal article
Publication Details: Nuclear fusion, Vol.58(5), p.56003
DOI: 10.1088/1741-4326/aaaed0
ISSN: 0029-5515
eISSN: 1741-4326
Publisher: IOP Publishing Ltd
Grant note: DE-FC02-99ER54512 / U.S. Department of Energy (100000015) 633053 / Horizon 2020 Framework Programme (http://data.elsevier.com/vocabulary/SciValFunders/100010661) DE-SC0014264 / U.S. Department of Energy (100000015) DE-FC02-99ER54512; DE-SC0014264 / U.S. Department of Energy (http://data.elsevier.com/vocabulary/SciValFunders/100000015) H2020 Euratom (http://data.elsevier.com/vocabulary/SciValFunders/100010687) DOE Office of Science U.S. Department of Energy (100000015)
Language: English
Date published: 05/01/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9985113756902771

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