Healing plasma current ramp-up by Nitrogen seeding in the full Tungsten environment of WEST

Author(s):  
Patrick Maget ◽  
Pierre Manas ◽  
Jean-Francois Artaud ◽  
Clarisse Bourdelle ◽  
Jerome B Bucalossi ◽  
...  

Abstract Achieving a successful plasma current ramp-up in a full Tungsten tokamak can be challenging due to the large core radiation (and resulting low core temperature) that can be faced with this heavy metallic impurity if its relative concentration is too high. Nitrogen injection during the plasma current ramp-up of WEST discharges greatly improves core temperature and Magneto-Hydro-Dynamic stability. Experimental measurements and integrated simulations with the RAPTOR code complemented with the Qualikiz Neural Network for computing turbulent transport allow a detailed understanding of the mechanisms at play. Increased edge radiation during this transient phase is shown to improve confinement properties, driving higher core temperature and better MHD stability. This also leads to increased operation margins with respect to Tungsten contamination.

2016 ◽  
Vol 11 (0) ◽  
pp. 2403068-2403068 ◽  
Author(s):  
Takuma WAKATSUKI ◽  
Takahiro SUZUKI ◽  
Nobuhiko HAYASHI ◽  
Junya SHIRAISHI ◽  
Shunsuke IDE ◽  
...  

2013 ◽  
Vol 8 (0) ◽  
pp. 1205007-1205007 ◽  
Author(s):  
Makoto NAKAMURA ◽  
Kenji TOBITA ◽  
Hiroyasu UTOH

2009 ◽  
Vol 51 (6) ◽  
pp. 065020 ◽  
Author(s):  
S H Kim ◽  
J F Artaud ◽  
V Basiuk ◽  
A Bécoulet ◽  
V Dokuka ◽  
...  

2002 ◽  
Vol 42 (10) ◽  
pp. 1257-1272 ◽  
Author(s):  
Osamu Mitarai ◽  
Ryuji Yoshino ◽  
Kenkichi Ushigusa

2013 ◽  
Vol 33 (2) ◽  
pp. 149-157 ◽  
Author(s):  
G. De Tommasi ◽  
◽  
G. Ambrosino ◽  
M. Ariola ◽  
G. Calabrò ◽  
...  

2015 ◽  
Vol 57 (6) ◽  
pp. 065005 ◽  
Author(s):  
T Wakatsuki ◽  
T Suzuki ◽  
N Hayashi ◽  
J Shiraishi ◽  
S Ide ◽  
...  

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