Ederer D L, Saloman E B, Ebner S C, Madden R P
Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1975 Nov-Dec;79A(6):761-774. doi: 10.6028/jres.079A.032.
Synchrotron radiation has been used as a standard source to calibrate spectrographic instruments at the National Bureau of Standards (NBS). Conceptually it is straightforward to apply the calculable continuum distribution of synchrotron radiation to problems requiring a source of known irradiance if the electron energy, the radius of the electron orbit, and the beam current are known. In practice many factors affect the accuracy of such a calibration, such as temporal and spatial variations in the electron beam, uncertainties in the orbital radius and maximum energy of the orbiting electron beam. These sources of error are discussed and the method of calibration on SURF-I is specified. A storage ring synchrotron radiation facility (SURF-II) is now operational at NBS. The calibration techniques developed for SURF-I are applied to SURF-II with anticipated improvements in calibration accuracy. For SURF-I the incident flux was determined with an accuracy of 15 percent while for SURF-II we anticipate accuracies of about 7 percent.
同步辐射已被用作国家标准局（NBS）校准光谱仪器的标准光源。从概念上讲，如果已知电子能量、电子轨道半径和束流，那么将可计算的同步辐射连续谱分布应用于需要已知辐照度光源的问题是很直接的。实际上，许多因素会影响这种校准的准确性，例如电子束的时间和空间变化、轨道半径的不确定性以及轨道电子束的最大能量。本文讨论了这些误差来源，并规定了在SURF - I上的校准方法。国家标准局现在有一个储存环同步辐射设施（SURF - II）投入运行。为SURF - I开发的校准技术已应用于SURF - II，预计校准精度会有所提高。对于SURF - I，入射通量的测定精度为15%，而对于SURF - II，我们预计精度约为7%。
