Identification of the primary processes that lead to the drop in divertor target ion current at detachment in TCV | Zendy

Fil A. | Zendy; Dudson B. | Zendy; Lipschultz B. | Zendy; Moulton D. | Zendy; Verhaegh K. | Zendy; Fevrier O. | Zendy; Wensing M. | Zendy

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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 , ion , ion current , current (fluid) , drop (telecommunication) , atomic physics , ionization , plasma , lead (geology) , materials science , physics , nuclear physics , tokamak , computer science , telecommunications , quantum mechanics , 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.

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