Experiments with synchrotron and ondulator radiation on the ''SIRIUS'' synchrotron

Experiments with synchrotron radiation (SR) performed on two vacuum channels of the SIRIUS synchrotron with 4 mrad horizontal angular dimensions of the SR beam at the output are described. Results of studying main characteristics of ondulator radiation (OR) and its application in the vacuum ultraviolet range are presented. It is shown that preliminary focusing of the OR at the monochromator entrance slit provided a 1 A limiting resolution at the width of entrance and exit slits being equal to 0.05 mm. Investigations carried out with the usage of SR are subdivided into three groups: studies of the effect of technological SR processing on the surfaces of niobium and its alloys; studies of electron states on metal-semiconductor and dielectric-semiconductor boundaries; studies of the effect of intense vacuum ultraviolet radiation on some materials. Using a flat magnetic ondulator with 10 periodicity elements (the length of each element is 70 mm) positioned in the SIRIUS straight section, the OR spectrum has been measured for different magnetic fields in the ondulator. It is shown that the spectrum is quasilinear. Angular distributions of OR and OR polarization components for a 500 nm wave are given