Liga method of forming high-contrast collimators and anti-scatter grids with high aspect ratio

The article deals with creation and application of high-contrast anti-scatter X-ray grids for X-ray imaging in the range of 20–200 keV from microfocus X-ray tubes. A prototype high-aspect-ratio nickel grid structure is used to consider the impact of anti-scatter grid on the directional patterns of the IMA-2-150D X-ray tube. The suppression of scattered radiation and narrowing of the directional radiation pattern are demonstrated. The contrast of the nickel prototype is apparently insuffi cient. The article presents LIGA methods for manufacturing anti-scatter X-ray grids made of gold in Siberian Synchrotron and Terahertz Radiation Centre. A method for forming resistive grid structures using deep X-ray lithography is described and test structures are shown. The development of manufacturing technology for anti-scatter X-ray grids is in progress

X-ray full field microscopy at 30 KeV

In our X-ray full field microscopy experiments, we demonstrated a resolution better than 260 nm over the entire field of view of 80 μm x 80 μm at 30 keV. Our experimental setup at PETRA III, P05, had a length of about 5 m consisting of an illumination optics, an imaging lens and a detector. For imaging, we used a compound refractive lens (CLR) consisting of mr-L negative photo resist, which was fabricated by deep X-ray lithography. As illumination optics, we choose a refractive rolled X-ray prism lens, which was adapted to the numerical aperture of the imaging lens

Reflection of photons and azimuthal distribution of photoelectrons in a cylindrical beam pipe

In a cryogenic proton accelerator, such as the LHC, the creation of an electron cloud and generated heat loads resulting from electron bombardment are strongly dependent on the azimuthal distribution of created photoelectrons. In this context, photon reflection and photoelectron yield measurements have been performed using a beam line on the VEPP-2M storage ring. Six electrodes, covering the complete vacuum chamber perimeter, were mounted such that they could be suitably biased, and while one electrode was irradiated with synchrotron radiation the resulting electron current of all others could be measured. A detailed description of the experimental apparatus and the results of the measurements of photon reflection and the azimuthal distribution of generated photoelectrons are presented