CAJ | 학술논문

针对目前等离子体温度测量中常用的Boltzmann平面法和双线法的测量精度较差的问题，提出结合Boltzmann-Maxwell分布和Saha-Eggert公式来提高等离子温度的测量精度；根据高斯公式的面积与峰值关系建立了发射谱线线宽的简便算法，并通过谱线的Stark展宽计算等离子体的电子密度；建立了以 Mc-Whirter准则的等离子局部热平衡（LTE）态判据。以铝为被测样品的实验结果表明，随着激光能量的增加，等离子体温度和电子密度随之呈线性上升趋势；激光能量在127～510 m J范围内的等离子体电子密度变化范围为1.30532×1017～1.87322×1017 cm －3，等离子体温度的变化范围为12586～12957 K ，根据 M c-Whirter准则本实验中所有等离子体均满足LTE态阈值条件；针对在光谱仪波段内可观测到的处于同一电离态谱线相对较少的铝元素，在不适合用Boltzmann平面法计算温度时，利用Saha-Boltzmann方法对100组铝等离子体光谱进行温度测量的相对标准偏差（RSD ）为0.4％，相比于双线法的1.3％，大幅提高了测量精度。该计算方法可用于快速计算等离子体温度、电子密度及判断等离子体LTE态，在自由定标、光谱有效性分析、谱线的温度校正、确定最佳采光位置以及等离子体LTE分布状态等研究中都有较高的应用价值。
침대목전등리자체온도측량중상용적Boltzmann평면법화쌍선법적측량정도교차적문제，제출결합Boltzmann-Maxwell분포화Saha-Eggert공식래제고등리자온도적측량정도；근거고사공식적면적여봉치관계건립료발사보선선관적간편산법，병통과보선적Stark전관계산등리자체적전자밀도；건립료이 Mc-Whirter준칙적등리자국부열평형（LTE）태판거。이려위피측양품적실험결과표명，수착격광능량적증가，등리자체온도화전자밀도수지정선성상승추세；격광능량재127～510 m J범위내적등리자체전자밀도변화범위위1.30532×1017～1.87322×1017 cm －3，등리자체온도적변화범위위12586～12957 K ，근거 M c-Whirter준칙본실험중소유등리자체균만족LTE태역치조건；침대재광보의파단내가관측도적처우동일전리태보선상대교소적려원소，재불괄합용Boltzmann평면법계산온도시，이용Saha-Boltzmann방법대100조려등리자체광보진행온도측량적상대표준편차（RSD ）위0.4％，상비우쌍선법적1.3％，대폭제고료측량정도。해계산방법가용우쾌속계산등리자체온도、전자밀도급판단등리자체LTE태，재자유정표、광보유효성분석、보선적온도교정、학정최가채광위치이급등리자체LTE분포상태등연구중도유교고적응용개치。
Because of the poor accuracy of the commonly used Boltzmann plot method and double-line method ,the Boltzmann-Maxwell distribution combined with the Saha-Eggert formula is proposed to improve the measurement accuracy of the plasma temperature ;the simple algorithm for determining the linewidth of the emission line was established according to the relationship between the area and the peak value of the Gaussian formula ,and the plasma electron density was calculated through the Stark broadening of the spectral lines ;the method for identifying the plasma local thermal equilibrium (LTE) condition was established based on the McWhirter criterion .The experimental results show that with the increase in laser energy ,the plasma temperature and electron density increase linearly ;when the laser energy changes within 127~510 mJ ,the plasma electron density changes in the range of 1.305 32 × 1017 ~1.873 22 × 1017 cm-3 ,the plasma temperature changes in the range of 12 586~12 957 K ,and all the plasma generated in this experiment meets the LTE condition threshold according to the McWhirter criterion .For element Al ,there exist relatively few observable lines at the same ionization state in the spectral region of the spectrometer ,thus it is un-able to use the Boltzmann plane method to calculate temperature .One hundred sets of Al plasma spectra were used for tempera-ture measurement by employing the Saha-Boltzmann method and the relative standard deviation (RSD) value is 0.4% ,and com-pared with 1.3% of the double line method ,the accuracy has been substantially increased .The methods proposed can be used for rapid plasma temperature and electron density calculation ,the LTE condition identification ,and are valuable in studies such as free calibration ,spectral effectiveness analysis ,spectral temperature correction ,the best collection location determination , LTE condition distribution in plasma ,and so on .