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Stabilization of Interchange Modes in Mirror Plasmas by a Nonlinear rf-Plasma Wave Coupling Process
Jhang, Hogun,Lee, S. G.,Kim, S. S.,Park, B. H.,Bak, J. G. American Physical Society 2005 Physical review letters Vol.95 No.3
<P>Experimental and theoretical studies are made of the consequences of a nonlinear coupling process between pump rf waves and interchange modes in mirror plasmas. It is demonstrated that the interchange-stable operation window exists depending on the applied rf power and gamma=omega(0)/Omega(i), where omega(0) (Omega(i)) is the angular frequency of the applied rf wave (ion cyclotron frequency). Results are shown that the nonlinear wave coupling process gives rise to the operation window near the resonance (gamma approximately equal to 1), which is elucidated by theoretical analyses combined with full rf wave simulations.</P>
Impact of zonal flows on edge pedestal collapse
Jhang, Hogun,Kaang, Helen H.,Kim, S.S.,Rhee, T.,Singh, R.,Hahm, T.S. International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.2
<P>We perform a computational study of the role of zonal flows in edge pedestal collapse on the basis of a nonlinear three-field reduced magnetohydrodynamic (MHD) model. A dramatic change of dynamics takes place when ideal ballooning modes are completely stabilized. Analyses show that a new instability is developed due to a strong excitation of zonal vorticity, resulting in a series of secondary crashes. The presence of subsidiary bursts after a main crash increases the effective crash time and energy loss. These simulation results resemble the behavior of compound edge localized modes (ELMs). Analyses in this paper indicate that a complete understanding of ELM crash dynamics requires the self-consistent inclusion of nonlinear zonal flows-MHD interaction and transport physics.</P>
Summary of the 6th asia-pacific transport working group (APTWG) meeting
Jhang, Hogun,Ghim, Y.-c.,Wang, Zheng-Xiong,Kwon, J.M.,Tamura, N. IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.8
<P>This report summarizes the contributions to, and discussions at, the 6th Asia-Pacific Transport Working Group (APTWG) meeting, held on 21–25 June 2016 at Korea University, Seoul, Republic of Korea. The objective of the meeting was to develop an integrated understanding of transport phenomena in magnetically confined plasmas. To accomplish this objective, four technical working groups were organized under the headings: (1) turbulence suppression and transport bifurcation, (2) effect of magnetic topology on transport and magnetohydrodynamics-turbulence interaction, (3) nonlocality and non-diffusive transport, and (4) Energetic particles and particle/impurity transport. A summary is also given of the three plenary review talks on impurity transport, the magnetohydrodynamics relaxation process in reversed field pinch, and recent experimental and modelling results on the quiescent H-mode operation.</P>
Efficacy of magnetic diagnostics for plasma boundary reconstruction in KSTAR
Sergey Tsaun,Hogun Jhang,S.G. Lee 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A parametric study of the efficacy of magnetic measurements is carried out for real-time plasma boundary reconstruction in KSTAR. A shape identification method based on the finite element method is used. It is shown that a reduced set of KSTAR magnetic diagnostics can be constructed in such a way as to provide the shape identification with similar precision compared to the full set.code
Optimization of ITER poloidal field coil currents at initial magnetization phase
Jung, Laurent,Jhang, Hogun Elsevier 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>We calculate a set of ITER poloidal field (PF) coil currents at the initial magnetization phase using the quadratic programming algorithm. The optimization is performed by exploiting the total magnetic energy of the ITER PF system as a cost function to be minimized. We also develop a simple analytic model which can make a rapid evaluation of temperature margin of superconducting PF coils for a given set of coil currents. This calculation is necessary for a quick examination of the compatibility of the PF scenario with engineering constraints. For an easy adaptation to the future integrated ITER simulator, all modules are developed using the ITER Integrated Modeling Analysis Suite (IMAS) data structure and the Kepler framework.</P>