Investigation of recombination front region in detached plasmas in a linear divertor plasma simulator

TitleInvestigation of recombination front region in detached plasmas in a linear divertor plasma simulator
Publication TypeJournal Article
Year of Publication2019
AuthorsN. Ohno, M. Seki, H. Ohshima, H. Tanaka, S. Kajita, Y. Hayashi, H. Natsume, H. Takano, I. Saeki, M. Yoshikawa, H.J van der Meiden
JournalNuclear Materials and Energy
Volume19
Pagination458-462
Date Published05/2019
Abstract

We have investigated detailed plasma structure around the recombination front region (RFR), where volume electron-ion recombination (EIR) strongly occurs in detached plasmas, by using two-dimensional (2D) movable probe system as well as laser Thomson scattering diagnostics. The 2D distribution of electron density, electron temperature, and plasma potential around the RFR, has been revealed for the first time. The spatial distribution of the particle loss rate due to EIR estimated from electron temperature and electron density profiles indicated that the three-dimensional structure of the RFR adopts a cone structure. Furthermore, in the peripheral region of the RFR, the radial profile of the electron density was widened locally with increasing cross-field transport caused by plasma fluctuation. From the heat transport analysis of electrons, it was found that the thermal relaxation process between electrons and ions is important for the cooling of electrons, and that the convection of electrons regulates electron heat transport near the RFR.

DOI10.1016/j.nme.2019.03.010
Division

PSI

Department

PMI

PID

0dcc8581710dab86c33f27b05c894125

Alternate TitleNucl. Mater. Energy
LabelOA

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