Interpretative 3D MHD modelling of deuterium SPI into a JET H-mode plasma

• DOI: 10.1088/1741-4326/ad3b1c
• Publication Date: 2024-04-05T22:25:12Z
• Authors: M. Kong; E. Nardon; M. Hoelzl; D. Bonfiglio; D. Hu; S.-J. Lee; R. Samulyak; U. Sheikh; S. Silburn; F.J. Artola; A. Boboc; G. Bodner; P. Carvalho; E. Delabie; J.M. Fontdecaba; S.N. Gerasimov; T.C. Hender; S. Jachmich; D. Kos; K.D. Lawson; S. Pamela; C. Sommariva; Z̆. S̆tancar; B. Stein-Lubrano; H.J. Sun; R. Sweeney; G. Szepesi
• Keywords: Mode (computer interface)

Abstract The pre-thermal quench (pre-TQ) dynamics of a pure deuterium ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">D</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) shattered pellet injection (SPI) into <mml:mn>3</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mi>MA</mml:mi> / <mml:mn>7</mml:mn> <mml:mi>MJ</mml:mi> JET H-mode plasma is studied via 3D non-linear MHD modelling with the JOREK code. interpretative captures overall evolution measured density and radiated power. simulations also identify importance drifts ablation plasmoids towards tokamak low field side (LFS) impurities in background fragment penetration, assimilation, radiative cooling activity SPI experiments. It found that plasmoid lead to an about 70% reduction central line-integrated (compared simulation without drifts) discharge considered. Impurities pre-exist before as well those from possible impurity influxes related are shown dominate radiation considered discharge. With inputs simulations, Lagrangian particle-based code PELOTON reproduces deviation fragments direction major radius observed by fast camera. This confirms role rocket effects reinforces validity modelling. limited core rise due strong (depending on their species concentration) could limit effectiveness LFS runaway electron avoidance worth considering design ITER disruption mitigation system.