V.F. Pindyurin

SEARCH FOR BIOLOGICAL OBJECTS BY REFRACTION RADIOGRAPHY USING SYNCHROTRON RADIATION OF VEPP-3 STORAGE RING

Abstract The possibility of using synchrotron radiation (SR) for obtaining the X-ray images of biological objects by the method of refraction radiography at the energies of 8.9 and 33.2 keV is shown. The results of experiments at the storage ring VEPP-3 (Novosibirsk) are presented. In comparison with a conventional X-ray source, the exposition time with SR is reduced by a factor of more than a thousand (approximately, down to 1–2 s), and the quality of images is improved.

X-ray lens with kinoform refractive profile created by x-ray lithography

X-ray kinoform lenses were proposed earlier as focusing devices with refractive and diffractive properties. Deep X-ray lithography technique was applied to realize kinoform lenses in thick resist layers PMMA. Created lens has rather short focal distance 20 cm at base energy 17.5 keV and full aperture 1.5mm with outermost segments 2 μm in width. Predicted performance of created lens is compared with simple parabolic lenses. Applications of kinoform lenses are considered and potentials of X-ray lithography for creation new versions of refractive focusing devices are discussed.

Influence of irradiation of poly-(ethylene terephthalate) films with X-rays upon the rate of dissolution in alkali water solution

Abstract Industrial films of poly-(ethylene terephthalate) 10, 25, 50, 100 and 200 μm thick were used in deep X-ray lithography as an X-ray-sensitive polymer. The investigation of the influence of irradiation condition of poly-(ethylene terephthalate) upon the rate of dissolution in a water solution of NaOH was carried out. The microstructures obtained in a polymer film are characterized by high aspect ratio, up to 12.

Micron spatial resolution X-ray image plates with non-erasing reading

Abstract New silverless radiophotoluminescence substances NaCl(Me) and LiF(Me) are proposed and tested as X-ray image detectors. Their spatial resolution is not worse than 2 μm and they allow one to register X-ray pictures with a dynamic range of about 5000. A stored X-ray image can be read out many times by photoluminescence measurements under UV excitation. The image can be erased completely by heating the substances up to a temperature of 400°C during 0.5 h.

Stabilization system of synchrotron radiation beams at the VEPP-3 storage ring

Abstract The system for position stabilization of synchrotron radiation (SR) beams at the VEPP-3 storage ring (Novosibirsk, Russia) is described. The system is based on measuring, at the same place, the positions of two SR beams emitted from different points of electron orbit in the storage ring. The results of the system testing and estimations of residual orbit instability under the system control are presented, as well.

Preliminary testing of microstructured Imaging Plates with improved spatial resolution

Abstract Read-out device and method for the Contrast-Frequency Characteristics (CFC) measurements of the Imaging Plates X-ray area detectors are described. The results of the CFC measurements for the different types of these detectors are shown. Also shown is the preliminary result of CFC measurement for the new detector type - microstructured memorized Imaging Plates with improved spatial resolution, produced with LIGA-technology on the synchrotron radiation beam on the VEPP-3 storage ring. These results demonstrate that the specific information capacity of the new microstructured detectors more than 2 times exceed the specific information capacity of the FUJI serial production detectors.

Synchrotron radiation and free electron laser activities at SSRC

Abstract In the last decade the Siberian SR Centre has implemented a wide program of SR and FEL research in cooperation with various research centres and institutions in Russia and abroad. The report illustrates this program, including joint experiments with the use of SR and FEL sources available at the Budker Institute of Nuclear Physics (INP), the implementation of new joint projects in Novosibirsk and at other centres, as well as the delivery of equipment designed and fabricated at the Budker INP or in collaboration with the Russian industry. Some technical information about the SR storage rings, wigglers, undulators and free electron lasers which are being constructed, used or developed at Budker INP is given as well.

The experimental station for X-ray microscopy and microtomography at the VEPP-3 storage ring

Abstract The experimental station for X-ray scanning transmission microscopy and microtomography using synchrotron radiation from the VEPP-3 is described. The station allows usual and difference microroentgenographs and microtomographs to be taken in the quanta energy range 5–35 keV. At present the achievable spatial resolution is estimated to be 2–3 μm.

X-ray monochromator for digital subtraction angiography using synchrotron radiation

Abstract The design of an X-ray double beam monochromator for digital subtraction angiography using synchrotron radiation is described. The monochromator provides two line-like monochromatic beams with a quanta energy just above and below the K-absorption edge of iodine. The monochromatization is performed by two flat silicon crystals in Laue diffraction on the (111) plane. The experimental results of testing the monochromator using synchrotron radiation from the VEPP-3 storage ring are also presented.

The station for detector calibration in the soft X-ray range at the VEPP-2M storage ring

Abstract The experimental station for detector calibration with synchrotron radiation (SR) in the photon energy range of 0.1–1 keV has been designed and constructed at the storage ring VEPP-2M. SR from a positron beam is extracted from a bending magnet of the storage ring and monochromatized by a multilayer mirror. The first calibration procedures are to use the good calculability of the SR photon flux and the measured parameters of the multilayer monochromator when the calibration is performed in a monochromatic beam, or the reconstruction of a detector spectral sensitivity from detector signals measured in “white” SR beam through a set of calibrated absorbing filters and at different positron energies. A description of the station, the estimations of the calibration uncertainties and preliminary results of the monochromator testing are presented.