间接驱动装置中球形腔内激光束传输特性

针对间接驱动装置中球形腔结构及其光路排布，并基于光谱角色散、连续相位板(CPP)和偏振控制板联用的束匀滑方案，建立了球形腔内激光束的传输模型。由于球形腔和光路排布的高度球对称性，在对激光束经过注入孔的传输特性进行分析时，选取注入孔所在平面作为观察面，并主要对其“堵孔”问题进行分析；在对腔内的传输及腔壁的辐照特性进行分析时，选取了一系列同心球面作为观察面，以分析其均匀性。计算结果表明当不同入射角度的激光集束采用相同的CPP 设计时，随集束入射角度的增大，在注入孔处，激光的注入率降低，更易导致“堵孔”现象，但激光集束在腔内的交叉重叠会逐渐减少，其在腔壁上的光斑均匀性有所改善，且整体光斑的占空比较有所提高，更利于靶丸均匀辐照。当不同入射角度的激光集束采用不同的CPP 来优化光斑时，在注入孔的“堵孔”问题得到改善，而腔壁的占空比有所降低。在实际工作中，应综合考虑注入孔的注入率和堵孔问题、腔内的交叉、腔壁上的光斑均匀性及占空比，对球形腔中集束的入射角度进行合理设计。

Abstract

In indirect-drive inertial confinement fusion facilities, aimed at the spherical hohlraum structure and the laser quads configuration, and based on the beam smoothing scheme implemented by the combined use of smoothing by spectral dispersion, continuous phase plate (CPP) and polarization control plate, the propagation model of laser quads in the spherical hohlraum has been built up. Because of the high spherical symmetry of spherical hohlraum and laser quads configuration, the plane of the laser entrance hole (LEH) is taken as the observation plane for analyzing the characteristics of laser quads propagating through the LEH, and the LEH closure problem is mainly analyzed. A series of concentric spherical surfaces have been taken as the observation surfaces for analyzing the propagation characteristics of laser quads in spherical hohlraum and the illumination characteristics on hohlraum wall. Simulation results indicate that, When different incident angles of the laser quads are used with the same CPP, with the increasing of the laser quads incident angle, the laser energy injection rate at LEH decreases and it is easier to bring about the LEH closure, while the cross and overlap of laser quads reduce gradually, the illumination uniformity on the hohlraum wall slightly improves and the duty ratio of all laser quads on the hohlraum wall is also improved, which is helpful for achieving the irradiation uniformity of the target. As different incident angles of the laser quads using the different CPP, the LEH closure problem is improved, While the duty ratio of the hohlraum wall decreased. In practical applications, it is required to design the laser quads incident angle appropriately by taking the LEH injection rate and the LEH closure problem, the overlap and uniformity of laser quads in hohlraum, as well as the irradiation uniformity of all quads and the duty ratio on hohlraum wall into consideration.

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