Ghilea M C, Sangster T C, Meyerhofer D D, Lerche R A, Disdier L
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Rev Sci Instrum. 2008 Feb;79(2 Pt 1):023501. doi: 10.1063/1.2839023.
Neutron-imaging systems are being considered as an ignition diagnostic for the National Ignition Facility (NIF) [Hogan et al., Nucl. Fusion 41, 567 (2001)]. Given the importance of these systems, a neutron-imaging design tool is being used to quantify the effects of aperture fabrication and alignment tolerances on reconstructed neutron images for inertial confinement fusion. The simulations indicate that alignment tolerances of more than 1 mrad would introduce measurable features in a reconstructed image for both pinholes and penumbral aperture systems. These simulations further show that penumbral apertures are several times less sensitive to fabrication errors than pinhole apertures.
中子成像系统正被考虑用作国家点火装置（NIF）的一种点火诊断工具[霍根等人，《核聚变》41卷，567页（2001年）]。鉴于这些系统的重要性，一种中子成像设计工具正被用于量化孔径制造和对准公差对惯性约束聚变重建中子图像的影响。模拟结果表明，对于针孔和半影孔径系统，超过1毫弧度的对准公差会在重建图像中引入可测量的特征。这些模拟进一步表明，半影孔径对制造误差的敏感度比针孔孔径低几倍。
