First plasma scenario development for HL-2M

Highlights: • A MATLAB-based plasma discharge scenario design tool, called SE, is introduced. • The 'Preis' plasma resistance model is introduced instead of the Ejima model to calculate the resistive flux consumption. • The principles to design a simple and safe first plasma scenario for HL-2M are presented. • The two first plasma scenarios of HL-2M are presented, with waveforms for flux consumption, PF current and PF voltage. -- Abstract: The main parameters of HL-2 M are presented. A Matlab-based tool for tokamak modeling and plasma scenario development is developed. With this tool, two scenarios for first plasma are designed for HL-2 M commissioning campaign. The two scenarios including one limiter configuration and one divertor configuration are compatible with the magnetic diagnostic system and power supply system, which are not fully equipped and well tested. The magnetic diagnostic system is presented with a simple but good enough R and Z estimation formulae through flux loops inside vacuum vessel for RZIp feedback control policy. The key parameters for the two scenarios are as follows: toroidal field 1.4T, plasma current 200kA with 1000ms flattop. For the sake of simplicity and safety, only small parts of PF coils are used in the plasma discharge, no initial magnetization is exploited, no PF current zero-crossing is allowed, no VDE is expected. To facilitate obtaining the plasma, two gyrotrons of 68GHz with 500kW each are exploited for preionization and assisted startup.