Speaker
Description
This presentation examines the energetic particle transport induced by saturated kink modes and sawtooth crashes in JET deuterium plasmas. It is known that kink mode-resonant transport[1-3] and phase-space redistribution from sawtooth crashes[4-5] can drive strong fast ion transport with dependencies on particle pitch and energy. Measurements with JET's Faraday cup fast ion loss detector array have shown that the internal kink growth phase preceeding sawtooth crashes produces substantial fast ion losses.[6] This report will numerically investigate the dominant energetic particle transport mechanism with a detailed examination of the fast ion phase-space dependencies, resonances, topological effects, and induced losses associated with the long-lived, resonant, kink mode and non-resonant sawtooth crash. The ORBIT-kick model[7] forms the basis of the transport studies with realistic fast ion distributions produced from TRANSP[8]. A recently created reduced model for sawtooth induced transport[9] is compared against the standard Kadomtsev model within TRANSP while the saturated kink modes are modeled with ideal MHD codes and analytic theory. Figure 1 compares ORBIT calculated and ECE meaasured $T_e$ fluctuations for the saturated kink with methods based from [9] and demonstrates the power of the reduced modeling framework. The simulations are further validated against experiment with a newly developed synthetic Faraday cup fast ion loss detector[10] in addition to scintillator probe, neutron, and gamma-ray spectroscopy measurements.
![ORBIT calculated $\delta T_e$ fluctuations found with a methodology similiar to reference [9] in $(\psi_p,\theta)$, (a), and the corresponding RMS ampltiude compared against ECE measurements, (b).](https://i.ibb.co/Y3SDJxD/ppcf-2021-fig-amp-wide.jpg)
[1] Ya. I. Kolesnichenko, V. V. Lutsenko, et al. 1998 Phys. Plasmas 5 2963
[2] Ya. I. Kolesnichenko, V. V. Lutsenko, et al. 2000 Nucl. Fusion 40 1325
[3] R. Farengo et al. 2013 Nucl. Fusion 53 043012
[4] D. Kim, M. Podesta, D. Liu, and F. M. Poli 2018 Nucl. Fusion 58 082029
[5] D. Kim et al. 2019 Nucl. Fusion 59 086007
[6] P. J. Bonofiglo et al. 2020 Rev. Sci. Instrum. 91 093502
[7] M. Podesta et al. 2017 Plasma Phys. Control Fusion 59 095008
[8] doi:10.11578/dc.20180627.4
[9] M. Podesta et al. 2021 Plasma Phys. Control Fusion Submitted
[10] P. J. Bonofiglo et al. 2021 Nucl. Fusion Submitted
| Speaker's Affiliation | Princeton Plasma Physics Laboratory, Princeton |
|---|---|
| Member State or IGO | United States of America |
