起飞角 meaning in English

angle of departure
angle of jump

The position and size of the monochromator , focusing curvature radii and tilting angles of the germanium focusing monochromator under different different take - off angle , size and divergency of the second collimator and intensity loss due to the use of it were determined . the neutron flux at different wavelength , under different reflection and take - off angle of the monochromator and divergency of the first collimator , were given . the simulation on the aperture used for limiting beam size in front of the sample showed that , smaller the size of the aperture and further the distance from the aperture to the sample , greater the loss of the intensity and more serious the spread of the beam along vertical direction at the sample position which makes the practical sampling volume greater than expected
用蒙特卡罗模拟方法对中子应力衍射谱仪的设计方案进行了优化研究，提出了一系列可供参考的数据：确定了单色器的位置、尺寸、垂直聚焦单色器在不同起飞角下的聚焦曲率半径和倾角；讨论了第二准直器的尺寸和发散，以及使用第二准直器造成的强度损失；给出了在不同单色器反射面、起飞角、中子波长和第一准直器发散度的情况下样品处的中子注量率，以及多种组合情况下谱仪的分辨率曲线；对限束方孔的尺寸、距离样品远近对强度损失和测量中的影响做了深入研究。