Thfoin Isabelle, Landoas Olivier, Caillaud Tony, Disdier Laurent, Vincent Maxime, Bourgade Jean-Luc, Rossé Bertrand, Sangster Thomas C, Glebov Vladimir Yu, Pien Greg, Armstrong William
CEA, DAM, DIF, F-91297 Arpajon, France.
Rev Sci Instrum. 2010 Mar;81(3):033503. doi: 10.1063/1.3331494.
A high resolution neutron imaging system is being developed and tested on the OMEGA laser facility for inertial confinement fusion experiments. This diagnostic uses a coded imaging technique with a penumbral or an annular aperture. The sensitiveness of these techniques to misalignment was pointed out with both experiments and simulations. Results obtained during OMEGA shots are in good agreement with calculations performed with the Monte Carlo code GEANT4. Both techniques are sensitive to the relative position of the source in the field of view. The penumbral imaging technique then demonstrates to be less sensitive to misalignment compared to the ring. These results show the necessity to develop a neutron imaging diagnostic for megajoule class lasers taking into account our alignment capabilities on such facilities.
一种高分辨率中子成像系统正在欧米茄激光装置上进行开发和测试，用于惯性约束聚变实验。这种诊断方法采用了带有半影或环形孔径的编码成像技术。实验和模拟都指出了这些技术对未对准的敏感性。在欧米茄实验中获得的结果与使用蒙特卡罗代码GEANT4进行的计算结果吻合良好。这两种技术都对源在视场中的相对位置敏感。与环形技术相比，半影成像技术对未对准的敏感性较低。这些结果表明，考虑到我们在此类设施上的对准能力，有必要为兆焦耳级激光器开发一种中子成像诊断方法。
