COREDIV modelling of nitrogen and krypton seeding at the ASDEX Upgrade tokamak. (1st April 2022)

• Record Type: Journal Article
• Authors: Ivanova-Stanik, I; Zagórski, R; Chomiczewska, A; Bernert, M; Glöggler, S; Kallenbach, A
• Is Part Of: Plasma physics and controlled fusion. Volume 64:Number 4(2022)
• Publication Date: 2022-04-01
• Subjects: ASDEX Upgrade integrated modelling -- impurity seeding -- impurity radiation; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/ac5127
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Self-consistent core-scrape-off layer numerical simulations of an ASDEX-Upgrade discharge where the nitrogen (N) seeding is gradually replaced with the krypton (Kr) seeding during the plasma current flat-top phase are presented. These simulations are performed with the COREDIV code focusing on the prediction of the impurity evolution (W, Kr, N) with matched global plasma parameters: total and core radiation, temperature at the target plate and W concentration. The numerical results are compared with experimental measurements for shot #30503 at three different time points: 2.5 s (only N seeding), 4.2 s (N + Kr seeding) and 5.2 s (only Kr seeding). The calculated electron temperature at the divertor plate can be reduced to 3 eV with the highest Kr seeding. A good agreement between modelling results and experimental observations is reported.