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13 results on '"N Babinov"'

1. Large-scale collecting mirrors for ITER optical diagnostic

Author

D. Samsonov, I. Tereschenko, E. Mukhin, A. Gubal, Yu. Kapustin, V. Filimonov, N. Babinov, A. Dmitriev, A. Nikolaev, I. Komarevtsev, A. Koval, A. Litvinov, G. Marchii, A. Razdobarin, L. Snigirev, S. Tolstyakov, G. Marinin, D. Terentev, A. Gorodetsky, R. Zalavutdinov, A. Markin, V. Bukhovets, I. Arkhipushkin, A. Borisov, V. Khripunov, V. Mikhailovskii, V. Modestov, I. Kirienko, I. Buslakov, P. Chernakov, A. Mokeev, M. Kempenaars, P. Shigin, and E. Drapiko

Subjects
Nuclear and High Energy Physics, Condensed Matter Physics
Abstract

The challenges of large-scale mirror design for in-vessel collection system of ITER Divertor Thomson Scattering (DTS) are under consideration. These are the mirrors located out-of-line vision of fusion plasma (so called “second mirrors” i.e. not First Mirrors) with high-reflective Ag-based coating. The paper outlines: approaches providing optical surface shape and angular position stability; Ag coating applicability in nuclear irradiation, ITER in-vessel application and its resistance to Steam Ingress. Although, this assessment and the proposed solutions are considered in terms of ITER DTS compatibility, they may also appear to be of some use in other ITER diagnostics and in diagnostics of other fusion devices.

Published
2022

2. Digital filter polychromator for Thomson scattering applications

Author

S.V. Masyukevich, N Babinov, A.N. Bazhenov, A.G. Razdobarin, V.A. Solovey, D.S. Samsonov, V Solokha, M.M. Kochergin, G. S. Kurskiev, Al.P. Chernakov, An.P. Chernakov, A.E. Litvinov, P.V. Chernakov, Sergey Tolstyakov, A. M. Dmitriev, A.N. Koval, I.M. Bukreev, V.V. Semenov, and E.E. Mukhin

Subjects
010302 applied physics, Physics, History, business.industry, Thomson scattering, 01 natural sciences, 010305 fluids & plasmas, Computer Science Applications, Education, Polychromator, Optics, 0103 physical sciences, business, Digital filter
Published
2018

3. [Endoscopic evaluation of various methods of anastomosis after gastrectomy]

Author

L P, Nekrasov and B N, Babinov

Subjects
Peptic Ulcer, Jejunum, Duodenum, Gastrectomy, Anastomosis, Surgical, Bile Reflux, Gastroscopy, Stomach, Humans, Postgastrectomy Syndromes
Abstract

Resection of the stomach is still the principal method for surgical management of gastric and duodenal ulcer. The functional condition of the anastomosis depends on the method used. The authors conducted comparative endoscopic evaluation of anastomoses formed after Hofmeister-Finsterer, Billroth I, Andreo and Vitebsky according to the following criteria: shape and diameter; contractile and obturator function; gastrointestinal reflux; morphological changes in the zone of the anastomosis and the gastric stump. The authors analyse their own material concerning fibrogastroscopy in 168 patients after gastric resection, the anastomosis was established after Hofmeister-Finsterer in 93 of them after Vitebsky in 46, after Billroth I in 21, and after Andreo in 8. Vitebsky's modification of Billroth II anastomosis and Andreo's modification of Billroth I anastomosis possess the best functional capacities. Billroth I and Billroth II gastroenterostomy in Hofmeister-Finsterer's modification do not possess contractile and obturator property, which promotes reflux of bile into the gastric stump and the development of reflux gastritis and other complicating factors.

Published
1991

8. [Cancer and opisthorchiasis of the liver]

Author

A A, Shaĭn, S A, Rodkin, B N, Babinov, and G I, Goldina

Subjects
Adult, Male, Adenoma, Bile Duct, Liver Neoplasms, Humans, Female, Middle Aged, Opisthorchiasis
Published
1971

12. Diagnostic mirrors for ITER: research in the frame of International Tokamak Physics Activity.

Author

A. Litnovsky, V.S. Voitsenya, R. Reichle, M. Walsh, A. Razdobarin, A. Dmitriev, N. Babinov, L. Marot, L. Moser, R. Yan, M. Rubel, A. Widdowson, S. Moon, S.G. Oh, Y. An, P. Shigin, I. Orlovskiy, K.Yu. Vukolov, E. Andreenko, and A. Krimmer

Subjects
PLASMA jets, OPTICAL elements, THOMSON scattering, PHYSICS, PLASMA deposition
Abstract

Mirrors will be used as first plasma-viewing elements in optical and laser-based diagnostics in ITER. Deterioration of the mirror performance due to e.g. sputtering of the mirror surface by plasma particles or deposition of impurities will hamper the entire performance of the affected diagnostic and thus affect ITER operation. The Specialists Working Group on First Mirrors (FM SWG) in the Topical Group on Diagnostics of the International Tokamak Physics Activity (ITPA) plays an important role in finding solutions for diagnostic first mirrors. Sound progress in research and development of diagnostic mirrors in ITER was achieved since the last overview in 2009. Single crystal (SC) rhodium (Rh) mirrors became available. SC rhodium and molybdenum (Mo) mirrors survived in conditions corresponding to ~200 cleaning cycles with a negligible degradation of reflectivity. These results are important for a mirror cleaning system which is presently under development. The cleaning system is based on sputtering of contaminants by plasma. Repetitive cleaning was tested on several mirror materials. Experiments comprised contamination/cleaning cycles. The reflectivity SC Mo and Rh mirrors has changed insignificantly after 80 cycles. First in situ cleaning using radiofrequency (RF) plasma was conducted in EAST tokamak with a mock-up plate of ITER edge Thomson Scattering (ETS) with five inserted mirrors. Contaminants from the mirrors were removed. Physics of cleaning discharge was studied both experimentally and by modeling. Mirror contamination can also be mitigated by protecting diagnostic ducts. A deposition mitigation (DeMi) duct system was exposed in KSTAR. The real-time measurement of deposition in the diagnostic duct was pioneered during this experiment. Results evidenced the dominating effect of the wall conditioning and baking on contamination inside the duct. A baffled cassette with mirrors was exposed at the main wall of JET for 23,6 plasma hours. No significant degradation of reflectivity was measured on mirrors located in the ducts. Predictive modeling was further advanced. A model for the particle transport, deposition and erosion at the port-plug was used in selecting an optical layout of several ITER diagnostics. These achievements contributed to the focusing of the first mirror research thus accelerating the diagnostic development. Modeling requires more efforts. Remaining crucial issues will be in a focus of the future work of the FM SWG. [ABSTRACT FROM AUTHOR]

Published
2019
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