Development And Optimization Of Operation Scenario For China Fusion Engineering Test Reactor By Integrated Modelling

China Fusion Engineering Test Reactor is the next generation fusion facility that aims to bridge the gaps between the ITER and DEMO.In addition to the demonstration of fusion energy production,it also aims to explore blanket and divertor solution as well as to demonstrate tritium self-sufficiency.The conceptual design study of CFETR has been finished,based on which we can setup the physics and engineering design.This thesis focuses on the core scenario design of CFETR with integrated modeling.Three optimized fully non-inductive scenarios have been developed,namely Neutral Beam(NB)dominated,Radio Frequency(RF)dominated and purely RF scenario.Integrated modeling results show that all the three scenarios can meet the fusion power target of CFETR.For the NB dominated scenario,it's found that the fusion performance can be optimized by using a combination of high and low energy NB,which is efficient in current driving and generating torque to enhance the radial electric field shear and consequently the confinement,respectively.For the RF dominated scenario,it's found that launching from the high field side using vertical injection for electron cyclotron wave can drive larger and broader off-axis current profile compared to the conventional low field side launch.Launching from the high field side for lower hybrid wave can have deeper penetration into the core compared to the low field side launch due to its better accessibility.Both the light and heavy impurity effects on the fusion performance are studied based on the NB dominated scenario,for the light impurity,it's found that the competition effect of radiation and turbulence stabilization effect results in a optimized concentration of light impurity that maximize the fusion performance.As to the heavy impurity,its maximum allowed concentration is limited by the sustainment of H-mode operation.In addition to the core scenario design,validation efforts for the transport model,TGLF-Sat0,in the integrated modeling loop are taken.It's found that TGLF-Sat0 can work well for the low k turbulence dominated regimes while fails for high k turbulence dominated regimes.Motivated by the multi-scale nonlinear gyrokinetic simulation,we developed a saturation rule TGLF-Vx,which can unify the low k and high k turbulence dominated regimes so that TGLF-Vx is likely to be universally applicable.In addition,we use a combination of TGLF and GYRO to understand the core transport behavior of a hybrid shot of ASDEX Upgrade,it's found that the combined effects of strong electromagnetic stabilization and the entry of the second stable region of KBM should be responsible for the enhancement of core confinement.