Trauchessec V, Drouet V, Chollet C, Cornet P, Masclet-Gobin I, Chardavoine S, Prunet P, Duchastenier W, Diaz R, Le Deroff L, Wrobel R, Depierreux S
CEA, DAM, DIF, F-91297 Arpajon, France.
CEA, DAM, CESTA, F33114 Le Barp, France.
Rev Sci Instrum. 2022 Oct 1;93(10):103519. doi: 10.1063/5.0101786.
The newly operating near-backscattering imaging (NBI) system on the Laser MegaJoule (LMJ) is briefly described with emphasis on the temporally resolved measurements and their synchronization with the LMJ laser pulse through target shots taken as part of the diagnostic commissioning campaign. The NBI measures the stimulated Brillouin and Raman scattered light around two quadruplets (one inner and one outer) of the upper LMJ hemisphere. The temporal resolution is achieved with a unique system: a specifically designed wide-open optical lens images 40 points of a diffuser onto an array of optical fibers with the scattered light recorded on a multiplexed photodiode array.
简要介绍了激光兆焦耳装置（LMJ）上新运行的近背散射成像（NBI）系统，重点是时间分辨测量以及通过作为诊断调试活动一部分进行的靶标射击将其与LMJ激光脉冲同步。NBI测量LMJ上半球两个四联体（一个内部和一个外部）周围的受激布里渊散射光和拉曼散射光。时间分辨率是通过一个独特的系统实现的：一个专门设计的大孔径光学透镜将漫射器的40个点成像到光纤阵列上，散射光记录在多路复用光电二极管阵列上。
