Analyzing implosion symmetry based on fringe shifts of wide-angle velocity interferometer system for any reflector
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摘要: 提出在条纹相机前加载异形光纤面板或环转线光纤传像束实现广角任意反射面速度干涉仪（VISAR）条纹采样的诊断设计，发现采样位置坐标处于靶面某圆上。综合运用坐标变换、傅里叶变换、勒让德展开等方法提取广角VISAR条纹相位实现内爆对称性分析，并通过示例验证了其可行性。针对诊断方法的特点、光路设计、装置研发、数据处理等展开讨论，指出广角VISAR诊断内爆对称性的发展方向。运用该方法记录并分析广角VISAR条纹数据，可使靶丸内爆对称性诊断准确、直观、形象，能为惯性约束聚变中激光等离子体不稳定性、流体不稳定性等研究提供支撑。
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关键词:
- 任意反射面速度干涉仪 /
- 广角诊断 /
- 内爆对称性 /
- 勒让德展开 /
- 惯性约束聚变
Abstract: A recording design of wide-angle velocity interferometer system for any reflector (VISAR) fringe that loading shaped optical fiber panel or ring-to-line fiber bundle in front of the streak camera is presented, and the coordinates of recording position are located at a certain circle on pellet. To realize implosion symmetry analysis, the phase of wide-angle VISAR fringes is obtained by using coordinate transformation, Fourier transformation and Legendre expansion, and its feasibility is verified by examples. The diagnostic characteristics, optical design, equipment development and data processing of the method are discussed, and the development direction of implosion symmetry diagnosis based on wide-angle VISAR is introduced. Using this method to record and analyze the wide-angle VISAR fringe data can make implosion symmetry diagnosis accurate, intuitive and vivid, and can provide support for studying laser plasma instability and fluid instability in inertial confinement fusion research. -
图 1 广角VISAR内爆对称性诊断设计
Figure 1. Implosion symmetry diagnosis design based on wide-angle VISAR
图 2 广角VISAR加载异形光纤面板时的诊断区域
Figure 2. Diagnosis area when wide-angle VISAR is loaded with shaped optical fiber panel
图 3 光纤传像束环端半径不同时诊断的物面位置
Figure 3. Area where pellet is diagnosed when the radius of the ring end of ring-to-line fiber bundle is different
图 4 广角VISAR装载光纤面板时内爆对称性诊断分析示意图
Figure 4. Schematic diagram of implosion symmetry analysis based on wide-angle VISAR data when shaped optical fiber panel is loaded
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