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Identification of the primary processes that lead to the drop in divertor target ion current at detachment in TCV
Author(s) -
Fil A.,
Dudson B.,
Lipschultz B.,
Moulton D.,
Verhaegh K.,
Fevrier O.,
Wensing M.
Publication year - 2018
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201700171
Subject(s) - divertor , current (fluid) , ion , drop (telecommunication) , ion current , atomic physics , ionization , plasma , materials science , lead (geology) , physics , nuclear physics , tokamak , telecommunications , quantum mechanics , computer science , thermodynamics , geomorphology , geology
Using SOLPS‐ITER, we model a TCV conventional divertor discharge density ramp to understand the role of various processes in the loss of target ion current. We find that recombination is not a strong contributor to the rollover of the target ion current at detachment. In contrast, the divertor ion source appears to play a central role in magnitude (the source of most of the ion target current) and time, apparently dropping during the density ramps as a result of a drop in power available for ionization.