An 1.5D equilibrium evolution code was used to model the time evolution of thefirst ohmic discharges in the EAST experiment.Good agreement between the sinmlation and theexperimental results was obtained in the plasma current,major radius,electron temperature,loopvoltage and poloidal field (PF) current for the entire duration of the discharge,which indicates thatthe code is highly reliable and will allow to further study the EAST discharge.At the same time.the code also simulates some important plasma parameters without experimental measured datayet,such as the plasma minor radius,central and edge safety factors,elongation and triangilarity,which are important in the analysis of EAST data.
The reversed shear(RS)mode is one of the advanced configurations being consideredin EAST.Predictive simulations of EAST reversed shear configuration are carried out using an1.5D equilibrium evolution code.In order to have the desired monotonic q-profile during a tokamakdischarge,a successful preparation phase is required.In our simulation,the plasma current isramped up from 100 kA to a fiat-top maximum of 1.0 MA for four seconds.An ICRH power of1 MW is applied until the plasma shape is formed at the moment of 4 s,and then the power israised to 3 MW.A LHCD power of 3.5 MW is applied from ls to optimize the plasma currentdensity profile.A series of simulations are performed to study the influence of the time of applyingthe auxiliary heating on the plasma parameters.Based on these simulations,a scheme is proposedand tested for the control of the safety factor profile,which is very useful in real time profilecontrol in tokamak experiments.
