Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode

Varela, Jacobo; Spong, Donald A.; Garcia, Luis; Ohdachi, S.; Watanabe, K. Y.; Seki, Ryosuke; Ghai, Yashika

doi:10.1088/1741-4326/ac26a0

Title: Theoretical analysis of the saturation phase of the 1/1 energetic-ion-driven resistive interchange mode

Journal Article · Fri Oct 22 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac26a0· OSTI ID:1847501

^[1];

^[2];

^[3]; Ohdachi, S. ^[4]; Watanabe, K. Y. ^[4]; Seki, Ryosuke ^[4];

^[2]

Universidad Carlos III de Madrid (Spain); National Institute of Natural Science, Toki (Japan); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Universidad Carlos III de Madrid (Spain)
National Institute of Natural Science, Toki (Japan)

The aim of the present study is to analyze the saturation regime of the energetic-ion-driven resistive interchange mode (EIC) in the LHD plasma. In this work, a set of nonlinear simulations are performed by the FAR3d code that uses a reduced MHD model for the thermal plasma coupled with a gyrofluid model for the energetic particle (EP) species. The hellically trapped EP component is introduced through a modification of the averaged drift velocity operator to include their precessional drift. The nonlinear simulation results show similar 1/1 EIC saturation phases with respect to the experimental observations, reproducing the enhancement of the n/m = 1/1 resistive interchange modes (RIC) amplitude and width as the EP β increases, the EP β threshold for the 1/1 EIC excitation, the further destabilization of the 1/1 EIC as the population of the helically trapped EP increases and the triggering of burst events. The frequency of the 1/1 EIC calculated during the burst event is 9.4 kHz and the 2/2 and 3/3 overtones are destabilized, consistent with the frequency range and the complex mode structure measured in the experiment. In addition, the simulation shows the inward propagation of the 1/1 EIC due to the nonlinear destabilization of the 3/4 and 2/3 energetic particle modes, leading to the partial overlapping between resonances during the burst event. Finally, the analysis of the 1/1 EIC stabilization phase shows the excitation of the 1/1 RIC as soon as the flattening induced by the 1/1 EIC in the pressure profile vanishes, leading to the retrieval of the pressure gradient at the plasma periphery and the overcoming of the RIC stability limit.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1847501

Journal Information:: Nuclear Fusion, Vol. 61, Issue 12; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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