Analysis of beam ion driven Alfvén eigenmode stability induced by Tungsten contamination in EAST

Wang, Xihui H.; Huang, Juan; Varela, Jacobo; Zhao, Hailin L.; Spong, Donald A.; Xu, L. Q.; Shen, W.; Chang, J. F.; Fu, J.; Sun, Y. X.; Shi, C.; Wang, S. S.

doi:10.1088/1741-4326/ad0f5e

Analysis of beam ion driven Alfvén eigenmode stability induced by Tungsten contamination in EAST

Journal Article · Fri Dec 01 00:00:00 EST 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ad0f5e· OSTI ID:3002020

^[1]; ^[2]; ^[3]; ^[2]; ^[4]; ^[2]; ^[2]; ^[2]; ^[1]; Sun, Y. X. ^[1]; Shi, C. ^[1]; Wang, S. S. ^[2]

Chinese Academy of Sciences (CAS), Hefei (China). Hefei Institutes of Physical Science (HFIPS); University of Science and Technology of China, Hefei (China)
Chinese Academy of Sciences (CAS), Hefei (China). Hefei Institutes of Physical Science (HFIPS)
Univ. Carlos III de Madrid (Spain)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Alfvén eigenmodes (AE) activity is observed in the EAST high β_N and low B_T discharge 93910, operation scenario dedicated to explore the ITER baseline scenario. AEs are triggered after the plasma is contaminated by Tungsten that causes an abrupt variation of the thermal plasma and energetic particles (EPs) profiles. The aim of the present study is to analyze the AE stability in the 93910 discharge using the gyro-fluid code FAR3d, identifying the AE stability trends by comparing the plasma before and after the Tungsten contamination. Tungsten contamination causes the destabilization of Toroidal AEs (TAE) and Energetic particle modes (EPMs) in the same frequency range and radial location with respect to the experimental observation and M3D-K/GTAW code results. Next, a set of parametric studies are performed to analyze the effect of the thermal plasma and EP parameters on the AE stability. The analysis indicates a lower EP β threshold for the AEs destabilization if the EP energy increases, an improved AE stability of on-axis NBI configurations due to the stronger continuum damping in the inner plasma region as well as a large enhancement of the EP drive as the thermal ion density increases due to a higher ratio of the EP and Alfven velocities. Consequently, the simulations indicate the increment of the thermal ion density after the Tungsten contamination could be the main cause of the AE/EPM destabilization.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 3002020

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 64; ISSN 0029-5515; ISSN 1741-4326

Publisher:: IOP Science - IAEACopyright Statement

Country of Publication:: United States

Language:: English

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