双带X光源照射下几何因子对柱形靶腔中靶丸辐照不均匀度的影响

Contribution of Geometrical Factors to Irradiation Non Uniformity in Cylindrical Hohlraum with Two Side Ring Sources

讨论了在激光束作用下双端开口的柱形靶腔中产生双带状Ｘ光源的情况下，诸如带状光源的位置、柱靶腔的半径与长度之比及双带源的对称性和能量匹配性等几何因子对辐照不均匀度的影响。对辐照不均匀度进行了谱分析。通过采用类似Ｔｓａｋｉｒｉｓ等人给出的柱形靶腔在双带Ｘ光源下的靶腔温度空间分布，可以大大地简化辐照不均匀度的分析，可以用来计算辐照不均匀度随时间的变化。计算表明几何因子对辐照不均匀度有很大的影响。

The contribution from the geometrical factors to the rad tion monuniformity in the case of an open end cylindrical hohlraum is discussed. THe analysis is facilitated by using temperature profile of the cylindrical hohlraum heated by the two ring sources,the temperature profile of a Tsakiris′ Style. The temperature profile is seperated from the geometrical factors in the case of vacuum cylinder and small target ball. It is demonstrated how the geometrical factors influence the irradiation non-uniformity with lapse of time. The misalignment and energy imbalance produces odd order rms variation. It is also found that those locations of X-ray converters,which have minimun value of rms variation,move toward the edge of cylinder with lapse of time. This suggeste that the expansion of wall plasma is helpful to achieve a high radiation uniformity.