| 摘 要： | In the HL-1M plasma experiments, two refueling ways, the pellet injection and the gas puffing, are usually used. In recent years, a new refueling method, the supersonic molecule beam (SMB) injection, has been developed. SMB injection is an attempt to enhance the penetration depth and the fuelling efficiency of gas, as well as to reduce surface absorption of the injected particles and the impurity content in the plasma. In SMB injection experiments, the gas is injected into the plasma through a Laval nozzle at high gas pressure. In this case, the peak density and improving confinement have been achieved as in the case of a pellet injection.
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