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等离子体中的杂质将对等离子体的能量平衡产生很大的影响,杂质的增多将增加辐射损失功率,降低等离子体温度,使得等离子体约束性能变差。由于等离子体辐射损失功率与等离子体中的杂质密度有一定的关系,我们测量到等离子体辐射损失功率和辐射功率密度分布就可以得到等离子体中有关杂质的信息。
The impurities in the plasma will have a great impact on the energy balance of the plasma. The increase of the impurities will increase the power of the radiation loss, reduce the plasma temperature, and make the plasma confinement performance worsened. Since the power of the plasma radiation loss has a certain relationship with the impurity density in the plasma, we can get information about the impurities in the plasma by measuring the plasma radiation loss power and the radiation power density distribution.