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Development and Test of Ion Source with Small Orifice Cold Cathode
G. E. Bugrov,S. K. Kondranin,E. A. Kralkina,V. B. Pavlov,K. V. Vavilin,Heon-Ju Lee 한국진공학회(ASCT) 2001 Journal of Korean Vacuum Science & Technology Vol.5 No.1
The paper represents the results of the development and the test of “cold cathode” ion source model with 5 ㎝ aperture where the glow discharge is utilized for generation of electrons in the cathode of the ion source. The results of probe measurements of the ion source are represented. The integral parameters such as electron energy distribution function(EEDF), electron density and mean electron energy, discharge voltage-current characteristics, and distribution of ion beam were studied.
Optimisation of cold cathode ion source model
G.E.Bugrov,S.K.Kondranin,E.A.Kralkina,V.B.Pavlov,D.V.Savinov,K.V.Vavilin,Heon-JuLee 한국물리학회 2003 Current Applied Physics Vol.3 No.6
This paper represents the results of the optimisation of cold cathode ion source model with 5 cm extraction aperture diameter. Inthis model, the glow discharge is utilised for generation of electrons in the cathode of the ion source. The various models withdierent lengths of cathode and anode are tested. The shortest model with 4.5 cm in length of cathode and anode each showssatisfactory operation and can be used in cases when the high values of extracted ion current are not required. The best model fromthe point of view of ion beam current value and eciency of the discharge is the model with cathode length of 7 cm and anode lengthof 7 cm. In this case, the obtained maximum ion beam current is 110 mA when the discharge current is 1000 mA. In case whenmoderate values of extracted ion beam current are necessary, it is possible to operate the ion source even without the anode magneticsystem.. 2003 Elsevier B.V. All rights reserved.
BiBloch mappings and composition operators from Bloch type spaces to BMOA
Kwon, E.G.,Pavlovic, M. Academic Press 2011 Journal of mathematical analysis and applications Vol.382 No.1
The problem of constructing functions f<SUB>1</SUB>, f<SUB>2</SUB> analytic in the unit disc D of the complex plane satisfying|f<SUB>1</SUB><SUP>'</SUP>(z)|+|f<SUB>2</SUB><SUP>'</SUP>(z)|@?ψ(11-|z|),z@?D, is solved for a wide class of weights ψ that includes normal weights. Several applications are given. Particularly we can generalize known characterizations on Bloch-BMO pullbacks.
Powerelectonics for Pulsed Power Technology in KERI
Geun-hie Rim,E.P. Pavlov,Hong-Sik Lee,Jong-Soo Kim,Youn-Sik Jin,Ju-Won Baek,S.V. Shenderey,Dong-Wook Yoo,G.I. Gusev,S.A. Nikiforov,Young-Hoon Jung,In-Wha Jeong,Young-Wook Choi,Jong-Hyun Kim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper reviews the R&D results achieved in Korea<br/> Electrotechnology Research Institute (KERI) in a decade or so. KERI has developed pulsed power technology and its applications mostly based on power electronics. KERI’s R&D activity covers components, military systems, and industry applications.<br/> <br/> High voltage switching means developed in KERI are a rotary arc gap switch (11kV, 400kAp), a vacuum rotary arc gap (20kV, 150kAp), an inverse pinch switch (20kV, 150kAp), and 10kV semiconductor switch stacks made of thyristors and IGBTs. The IGBT and thyristor stacks consists of from ten to twelve 1.2kV discrete devices and<br/> are operated by only one active circuit located in the ground side. Some ferromagnetic opening switch schemes are also researched on trial bases. <br/> <br/> KERI has developed several pulsed power supplies responding to industry needs, of which applications are electrostatic precipitators, high voltage capacitor chargers, polluted gas treatment systems. The investigated pulsed power applications are rock fragmentation system, plasma ion implantation (PSII), food process, and fine metal powder fabrication system using wire-exploding process.
Kochervinskii, V.V.,Chubunova, E.V.,Lebedinskii, Y.Y.,Pavlov, A.S.,Pakuro, N.I. Techno-Press 2015 Advances in materials research Vol.4 No.2
The phenomena of high-voltage polarization and conductivity in oriented vinylidenefluoride and tetrafluoroethylene copolymer films have been investigated. It was shown that under certain electric fields, injection of carriers from the material of electrodes appears The barrier for holes injection in the copolymer was found to be lower than that for electrons. It results in more effective screening of the external field near the anode than near cathode. Electrones, ejected from cathode, creating negative charge by trapping on the surface. It is shown that the electrons injected from cathodes create a negative homocharge on the copolymer surface and then become captured on the surface shallow traps. Their nature has been studied by the x-ray photoelectron spectroscopy. It was shown that these traps may consist of chemical defects in the form of new functional groups formed by reactions of surface macromolecules with sputtered atoms of aluminum. The asymmetric shape of hysteresis curves was explained by the difference in mobility of injected holes and electrons. These factors caused appearance of "non-closed" hysteresis curves for fluorine-containing polymer ferroelectrics. Hysteresis phenomena observed at low electric fields (below coercive ones) are to associate with the behavior of the domains localized in the ordered regions formed during secondary crystallization of copolymers.
Novel Compact Current Type Pulse Power Generator
B. D. Min,J. H. Kim,E. Pavlov,D. W. Yoo,G. H. Rim 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a compact pulse generator for NOx removal application for diesel automotive. The rising time is important factor to increase NOx removal efficiency in pulsed corona discharge method. Manufacturing cost and compactness of the pulse power generator should be satisfied for automotive application. The proposed pulse power uses a low voltage thyristor, a pulse transformer with the function of saturated magnetic switch, and series connected general diodes as opening switch to satisfy that requirements. With 200 resistor load, the experiment results show that the output voltage is 21㎸, the rising time is about 21ns, and the pulse width (FWHM) is about 42ns.
The frequency effect on atmospheric pressure RF discharge surface modification
Heon-Ju Lee,A.F. Alexandrov,E.A. Kralkina,V.B. Pavlov,V.P. Savinov,V. Yu. Sergeenko,I.B. Timofeev,G.E. Bugrov,K.V. Vavilin,V. Yu. Plaksin,Young Son Mok 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.1
The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold. The physical mechanism of RF discharge at atmospheric pressure was studied at discharge frequencies of 13.56MHz and 0.6MHz. The discharge at 0.6 MHz had a clear filamentary structure, while discharge at 13.6 MHz had no separate filaments. The influence of discharge on the properties of polymer surfaces was also investigated, using two surface property indicators, the contact angle with water and adhesion strength. As a result of sample processing in the discharge, the wetting angle of polytetrafluorethylene (PTFE), polyethylene (PE), polyimide (PI) and polyvinyl chloride (PVC) decreased to 40o, 20o, 20o and 25o, respectively, and the adhesion of PTFE increased four fold.