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[ 2018 ] Analysis of fast ion loss due to RMP in KSTAR

Writer운영자

Register Date 2019-10-29

Analysis of fast ion loss due to RMP in KSTAR
Research Achievements Analysis of fast ion loss due to RMP in KSTAR
Main Contributor Kimin Kim
Related Research Project Integrated Modelling of Turbulence and Transport in Tokamak Fusion Plasmas
Major Research Achievements Qualitative Achievements
- While resonant magnetic perturbation(RMP) is beneficial in enhancing H-mode performance by controlling ELM, it can be detrimental in confining fast ions, which can result in the degradation of NBI and RF heating efficiency. So it is important to understand the physical mechanisms of fast ion loss by RMP.
- In this work, a new test particle code was developed to calculate fast ion orbit under perturbed equilibrium magnetic fields in tokamak. Then, the code was employed to simulate NBI ion losses by RMP in KSTAR plasmas.
- The simulations successfully reproduced the experimentally measured loss patterns of NBI fast ions for varying RMP strengths in the KSTAR plasmas.
Quantitative Achievements
- Published in Physics of Plasmas 25, 122511
- Presented in 2018 ITPA-EP workshop and APTWG conference
Superiorities & differences Superiorities
- The new code incorporated accurate magnetic field perturbations by RMP including realistic plasma response model.
- The new code could quantitatively reproduce the KSTAR experimental results.
Differences
- The new code employs more accurate RMP models including plasma responses and also realistic PFC geometry, while many existing test particle codes employ simplified models. This unique feature enables the new code to reproduce experimental results quantitatively.
Expected Effect &
Ripple Effect
Technical Perspectives
- The new code can be utilized to simulate and optimize alpha particle confinement in future tokamaks such as ITER.
Evidence Simulation of the changes of fast ion losses according to varying particle pitches
Simulation of the changes of fast ion losses according to varying particle pitches

Authorities concerned