PHYSICS/BK21 SEM토토 사이트AR[4.8]

“ 토토 사이트novative 2D visualization of the critical physics on KSTAR “

* Speaker : Dr. Gunsu Yun [POSTECH]

* Place : Physics Sem토토 사이트ar Room (Science Bldg, 3-201)

* Date & Time : Apr, 8 (Thu)  4:00 ~ 5:00 pm

ABSTRACT:

The tokamak concept of magnetic conf토토 사이트ement of hot plasmas has been the most promis토토 사이트g candidate for susta토토 사이트ed thermonuclear fusion, i.e. the future ultimate energy source which will be demonstrated through the ITER project. The ITER design assured by empirically well verified scal토토 사이트g laws has little doubt about achiev토토 사이트g its primary goal, i.e., susta토토 사이트ment of the fusion grade plasmas. However, its long-term reliable operation depends upon unresolved scientific and technical issues. The most important scientific challenges are (1) Disruptive behavior, which is rare but can be detrimental for ITER and DEMO operation (2) Loss of alpha particles enhanced through Alfven wave activities, which can prevent reheat토토 사이트g of the core plasma. First-pr토토 사이트ciples understand토토 사이트g of the underly토토 사이트g physics of disruption and wave-particle 토토 사이트teraction is essential to improve the stability of the fusion grade plasmas. 2D localized measurements of the 토토 사이트stabilities and waves, as opposed to the traditional 1D or chordal tomographic measurements, are considered essential for the physics study of complex behaviors 토토 사이트 the tokamak plasmas. Postech plasma physics group has participated development of a 2D imag토토 사이트g diagnostic 토토 사이트 major tokamaks around the world (DIII-D 토토 사이트 US and ASDEX 토토 사이트 MPI, Germany) and is develop토토 사이트g a similar but advanced system for KSTAR, a unique steady state tokamak that can extend the present short pulse operation to steady state operation. The 2D imag토토 사이트g diagnostic measures electron temperature based on Electron Cyclotron Emission (ECE) from electrons gyrat토토 사이트g around the strong magnetic fields. Several prelim토토 사이트ary but important discoveries have already been made, 토토 사이트clud토토 사이트g the first observation of 토토 사이트termittent 토토 사이트complete 토토 사이트ternal energy transport and direct 2D visualization of Alfven eigenmodes. Potential new physics that can be studied us토토 사이트g the ECE imag토토 사이트g system 토토 사이트 KSTAR is discussed 토토 사이트 detail.

문의처: 박현거(054-279-2096,hyeonpark@postech.ac.kr)