Dugan, G.F.; Sonnad, K.G.; Cimino, R.; Ishibashi, T.; Schäfers, F.: Measurements of x-ray scattering from accelerator vacuum chamber surfaces, and comparison with an analytical model. Physical Review Special Topics - Accelerators and Beams 18 (2015), p. 040704/1-20
10.1103/PhysRevSTAB.18.040704
Open Access Version
Abstract:
This paper compares measurements and calculations of scattering of photons from technical vacuum chamber surfaces typical of accelerators. Synchrotron radiation generated by a charged particle beam in the accelerator is either absorbed, specularly reflected, or scattered by the vacuum chamber surface. This phenomenon has important implications on the operation of the accelerator. Measurements of photon scattering were made at the BESSY-II synchrotron radiation facility using samples of aluminum vacuum chamber from Cornell electron storage ring (CESR). A description of the analytic model used in the calculation is given, which takes into account the reflectivity of the material, the surface features of the sample, the wavelengths and the incident angles of the photons. The surface properties used in these calculations were obtained from measurements made from an atomic force microscope.