等离子体电流密度分布优化是实现未来ITER和CFETR装置先进稳态运行模式的关键课题之一。合适的电流密度分布可以有效避免部分磁流体不稳定性的发生、降低输运并改善约束。相对于常规托卡马克可以在等离子体建立阶段优化电流密度分布，超导托卡马克的超导磁体限制了欧姆场电流变化率，导致等离子体建立时间远大于电流扩散时间，因而通过等离子体建立阶段预加热模式实现电流剖面优化异常困难。本项目依托EAST超导装置，提出利用完全非感应电流驱动运行平台研究电流分布优化，可以最大程度降低峰化的欧姆场电流对电流分布调控的影响。拟在完全非感应运行模式下，利用外部辅助加热电流驱动、自举电流两种方法优化电流密度分布，理解电流分布的演化过程和对约束性能的影响。该项目的实施对EAST托卡马克装置实现高参数长脉冲H模运行具有重要意义，同时也对未来ITER及CFETR稳态先进运行模式提供强有力的支持。

Optimization of plasma current density profile is essential for achieving steady state operation of ITER and CFETR. An optimized current profile has been demonstrated to be a key condition of avoiding MHD instability, suppressing turbulence and improving core confinement. For conventional tokamaks, current profile optimization has been proven to be achievable during plasma current ramp-up phase. However, the safe operation of superconducting magnet in superconducting tokamaks with limited Ohmic current ramp rate, result in that plasma current build-up time is much longer than the current relaxation time. The previous experiments have shown that it is hard to broaden current density profile with preheating in EAST ramp-up phase. A novel strategy of current profile optimization based on fully non-inductive scenario is addressed by external current drive and bootstrap current on EAST, together with the physics understanding of current profile evolution and confinement improvement. The success of this project will be of great importance to realize scientific goal of EAST long pulse H-mode and support for steady state operation of ITER and CFETR.