LHT40低功率霍尔推力器放电特性试验

为了获得300W级混合励磁模式低功率霍尔推力器的放电特性，采用一套高精度激光微推力测量装置和集成离子流诊断装置获得推力器不同工况下推力、比冲、效率、束流发散角和质量利用效率的变化特性。试验结果表明，推力器的推力、比冲、阳极效率在200～300V存在一个最大值；放电电流、放电电压呈现无阻尼谐波振荡特性，其一阶频率大约4.05kHz。在恒定电场和磁场下，推力器束流离子电流密度呈现双极扩散的结构；阳极流率增大至0.95mg/s时，离子电流密度呈现典型的双峰结构，质量利用效率与质量流率呈现正相关的特性。

Experimental research on discharge characteristics of LHT40 low power Hall thruster

In order to obtain the discharge characteristics of the 300W class hybrid-excited low-power Hall thruster, a high-precision micro-thrust laser measurement device and an integrated ion current density diagnostic device were used to access the characteristics of thrust, specific impulse, efficiency, beam divergence angle and mass utilization efficiency of the thruster for different operating conditions. There is a maximum for thrust, specific impulse and anode efficiency under discharge voltages from 200V to 300V. The discharge current and voltage exhibit damping-free harmonic oscillation, and the first-order frequency is about 4.05kHz. Under constant electric field and magnetic field, the beam ion current density presents a bipolar diffusion characteristics. When the anode flow rate is increased to 0.95 mg/s, the ion current density shows a typical double peak structure, and the mass utilization efficiency is positively correlated with anode mass flow rate.