Zobrazeno 1 - 10
of 20
pro vyhledávání: '"S. A. Churin"'
Autor:
N. N. Salashchenko, M. S. Mikhaylenko, M. V. Zorina, S. A. Churin, A. E. Pestov, Nikolay I. Chkhalo, D. E. Pariev, I. L. Strulya
Publikováno v:
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 11:485-489
The effect of Ne ion beam etching on the roughness of materials for optical substrates—fused silica and beryllium—is studied. It is shown that the treatment of a fused silica surface by neutralized Ne ions with an energy of 400–800 eV makes it
Autor:
D. I. Yurkov, S. P. Maslennikov, N. N. Shchitov, S. V. Churin, E. Ya. Shkol’nikov, A. A. Bitulev, D. S. Stepanov, S. G. Kladko
Publikováno v:
Atomic Energy. 118:354-359
Optimization of the operating regime of power supply circuits of vacuum neutron tubes by inserting additional elements eliminates the instability of current flow, matches the acceleration and discharge pulses, and makes it possible to decrease signif
Autor:
Nikolay I. Chkhalo, N. N. Salashchenko, M. V. Zorina, S. A. Churin, A. E. Pestov, I. M. Nefedov
Publikováno v:
Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. 9:765-770
Ion-beam methods are developed for forming supersmooth aspherical optical surfaces of polished fused quartz with a precision on the level of 3 nm relative to the standard deviation and 0.2–0.3 nm for the mean-square surface roughness in the range o
Autor:
M. S. Mikhaylenko, N. N. Salashchenko, S. A. Churin, A. E. Pestov, Nikolay I. Chkhalo, Vladimir N. Polkovnikov, M. V. Zorina
Publikováno v:
Applied optics. 55(6)
We have studied the surface treatment of polished fused silica by neutralized Ar ions with energy of 500-1500 eV and incidence angles of 0-90°. We found the following regularities: for samples that passed the standard procedure of deep polishing (in
Transfer of mass in the growth of Y1Ba2Cu3O7 +Y2BaCuO5pseudo-crystals by a top-seeded growth process
Autor:
S A Churin
Publikováno v:
Superconductor Science and Technology. 17:164-168
Textured Y1Ba2Cu3O7−δ+Y2BaCuO5 pseudo-crystals were grown by the partial melting method. The thermocapillary effect on the deviation of the stoichiometry of Y1Ba2Cu3O7−δ+Y2BaCuO5 bar samples during the partial melting process is shown. The hydr
Autor:
S. A. Churin, Yu. A. Vainer, Nikolay I. Chkhalo, A. E. Pestov, N. N. Salashchenko, M. V. Zorina
Publikováno v:
Optics express. 22(17)
The main problems and the approach used by the authors for roughness metrology of super-smooth surfaces designed for diffraction-quality X-ray mirrors are discussed. The limitations of white light interferometry and the adequacy of the method of atom
Autor:
S. A. Churin
Publikováno v:
Technical Physics Letters. 35:432-434
A method for growing Y1Ba2Cu3O7 − δ + Eu1Ba2Cu3O7 − δ (YBCO-EBCO) high-temperature superconductor rods is described. The temperature dependences of the resistance of rods in a magnetic field of B = 0.6 T and in the absence of the field (B = 0 T
Publikováno v:
Journal of Experimental and Theoretical Physics Letters. 70:787-791
The trapped flux distribution in thin wafers of both polycrystalline and granular superconductors having large demagnetization and edge barriers of different heights is measured by means of polarized neutrons. It is shown that the nature of the criti
Autor:
S. A. Churin
Publikováno v:
Technical Physics Letters. 34:4-6
A new method is proposed for growing Y1Ba2Cu3O7−δ (YBCO) rods and special growth regimes are described which provide decreasing losses in these rods in the superconducting state. It is shown that the thermocapillary mechanism of liquid phase trans
Autor:
S. A. Churin
Publikováno v:
Technical Physics Letters. 32:993-995
The influence of thermocapillary phenomena on the current-voltage characteristics of polycrystalline rods of Y0.8Sm0.2Ba2Cu3O7-δ and Y1Ba2Cu3O7-δ-Y2BaCuO5 high-temperature superconductor (HTSC) compositions has been studied. A mechanism of the crys