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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.
Radiation effect on the polymer-based capacitive relative humidity sensors
Shchemerov I.V.,Legotin S.A.,Lagov P.B.,Pavlov Y.S.,Tapero K.I.,Petrov A.S.,Sidelev A.V.,Stolbunov V.S.,Kulevoy T.V.,Letovaltseva M.E.,Murashev V.N.,Konovalov M.P.,Kirilov V.N. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
The sensitivity of polymer-based capacitive relative humidity (RH) sensors after irradiation with neutrons, electrons and protons was measured. Degradation consists of the decreasing of the upper RH limit that can be measured. At the same time, low RH-level sensitivity is almost stable. After 30 krad of absorption dose, RH cut off is equal to 85% of max value, after 60 krade40%. Degradation reduces after annealing which indicates high radiation sensitivity of the internal circuit in comparison to RH-sensing polymer film
W. Furman,A. Baldin,A. Rogov,B. Guskov,E. Kostyukhov,I. Marin,M. Krivopustov,N. Gunddorin,N. Rebrova,S. Pavlov,V. Krasnov,V. Smirnov,A. Chinenov,B. Fonarev,M. Galanin,N. Ryazansiy,S. Solodchenkova,V. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Prompt and delayed neutrons (DN) from pulsed irradiation of geometrically identical natural uranium and lead targets by 1 and 4 GeV deuterons were measured at NUCLOTRON facility of Joint Institute for Nuclear Research. The massive hexagonal shaped targets were surrounded by 10 cm lead blanket. Neutrons were measured by the assembly of ^3He counters embedded in moderator and by threshold activation detectors. The DN decay curves were analysed for both targets and information on fission properties for massive (∼315 kg) uranium target was extracted. The obtained experimental information could be useful for verification of INC and transport codes. The results of this experiment are important for development of advanced ADS systems and other applications.
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.
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.