Basic idea and physical models in DIVIMP are introduced and DIVIMP modelling of C impurity production and transport properties in edge plasma of EAST machine with ohmic heating are provided. Simulation results show favorable consistency with experimental measurements, demonstrating that the models coupled in DIVIMP are suitable for interpretive and predictive modelling of impurity transport in EAST machine. Transport properties of W impurity in EAST with heating power as high as 8MW are also predicted by DIVIMP modelling.

It investigates the application of solid crystallization process in the optimization algorithm.A special way is also proposed for the parameter "stirring" for the target function to get minimum value of the target function in the whole parameters' region.Meanwhile,the optimization algorithm is independent on the initial value of parameters without the larger calculation time.