Crespy Charles, Villate Denis, Lobios Olivier
CEA, Cesta, BP 2, 33114 Le Barp, France.
Rev Sci Instrum. 2013 Jan;84(1):014902. doi: 10.1063/1.4788940.
For laser megajoule (LMJ) facility, an accurate procedure for laser pulse energy measurement is a crucial requirement. In this study, the influence of measurement procedure on LMJ calorimeter uncertainty is experimentally and numerically investigated. To this end, a 3D thermal model is developed and two experimental techniques are implemented. The metrological characteristics of both techniques are presented. As a first step, the model is validated by comparing numerical and experimental results. Then, the influence of a large number of parameters considered as likely uncertainty sources on calorimeter response is investigated: wavelength, pulse duration, ambient temperature, laser beam diameter.... The post processing technique procedure is also examined. The paper provides some of the parameters required to allow a robust and efficient calibration procedure to be produced.
对于激光兆焦耳（LMJ）装置而言，精确的激光脉冲能量测量程序是一项至关重要的要求。在本研究中，通过实验和数值方法研究了测量程序对LMJ量热计不确定度的影响。为此，建立了一个三维热模型并采用了两种实验技术。介绍了这两种技术的计量特性。第一步，通过比较数值结果和实验结果对模型进行验证。然后，研究了大量被视为可能不确定度来源的参数对量热计响应的影响：波长、脉冲持续时间、环境温度、激光束直径……还对后处理技术程序进行了检查。本文提供了一些必要参数，以便制定出稳健且高效的校准程序。
