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为了研究全超导托卡马克稳态高参数等离子体性能,2008年在EAST托卡马克装置上研制并成功建成了一套能最大传输2兆瓦,工作频率是2450MHz的低混杂波电流驱动系统,要实现低杂波长时间地维持等离子体电流,还需要对低杂波系统的输出功率大小及运行时间长度提出更高要求,拟研制一套波源输出功率4 MW,中心频率4.6GHz,波谱范围为1.7< N_(//)< 2.5,运行脉冲宽度0～1000秒低杂波电流驱动系统.在EAST4.6GHz/4MW低杂波电流驱动系统中,因为速调管放大器和低杂波天线有共同的接地点,速调管放大器电源为负高压,有接地点,低杂波天线有接地点,并且和EAST托卡马克相连,在系统中要求不能有两个接地点,所以要通过隔直器来隔断托卡马克和速调管之间的的直流通路.论文详细介绍了隔直器的原理和设计过程,在以4.6GHz为中心频率,150MHz的频带范围内,隔直器各个端口微波性能良好.“,”In order to investigate the high performance regimes and achieve steady-state operation,a 2 MW /2.45 GHz Lower Hybrid Current Drive (LHCD) system has been designed, fabricated and successfully installed on Experimental Advanced Superconducting Tokamak (EAST) in 2008. For the sake of maintai-ning longer plasma current, a frequency of 4. 6GHz lowe hybrid current system(LHCD) will be construc-ted onto drive 4 MW microwave power,the power spectrum is 1.7 < N_(//)< 2.5, pulse width is 0-1000 second. The transmitter and the antenna which are the key composes of the system have the same groud,which will severely perturb the system s normal working To isolate the ground loop,the DC(direct cur-rent) break has beenesigned. The design principle has been presented. The microwave parameters is well at a center frenquency of 4.6GHz with 150MHz handwidth.