• Title/Summary/Keyword: Electron range

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The analysis on the Energy Distribution Function for Electron in SiH4-Ar Gas Mixtures (SiH4-Ar혼합기체의 전자분포함수 해석)

  • Kim, Sang-Nam
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.53 no.2
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    • pp.65-69
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    • 2004
  • This paper calculates and gives the analysis of electron swarm transport coefficients as described electric conductive characteristics of pure Ar, pure $SiH_4$, Ar-$SiH_4$ mixture gases($SiH_4$-0.5%, 2.5%, 5%) over the range of E/N = 0.01~300[Td], P = 0.1, 1, 5.0 [Torr] by Monte Carlo the backward prolongation method of the Boltzmann equation using computer simulation without using expensive equipment. The results have been obtained by using the electron collision cross sections by TOF, PT, SST sampling, compared with the experimental data determined by the other author. It also proved the reliability of the electron collision cross sections and shows the practical values of computer simulation. Electron swann parameters in argon were drastically changed by adding a small amount of mono-silane. The electron drift velocity in these mixtures showed unusual behaviour against E/N. It had negative slope in the medium range of E/N, yet the slope was not smooth but contained a small hump. The longitudinal diffusion coefficient also showed a corresponding feature in its dependence on E/N. A two-tenn approximation of the Boltzmann equation analysis and Monte Carlo simulation have been used to study electron transport coefficients.

Frequency dependance of Transformer Oils due to electron beam irradiation (전자선조사에 따른 변압기유의 주파수의존특성)

  • Hong, Nung-Pyo;Park, Woo-Hyun;So, Byeong-Moon;Kim, Wang-Kon;Hong, Jin-Woong
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1126-1128
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    • 1995
  • In order to investigate the electrical properties for transformer oils due to electron bean irradition, the dielectric properties was made researches by dose of irradition To measure the dielectric loss of irradiated specimen, coaxial cylindrical liquid electrode was used, geometric capacitance was confirmed to 16[pF]. Experiments for measuring the dielectric loss were performed at $20{\sim}120[^{\circ}C]$ in temperature range, $30{\sim}1.5{\times}10^5$[Hz] in frequency range and $300{\sim}1500$[mV] in voltage range and then, the result of experiment for the movement of carrier and the physical constants to contribute dielectric properties of specimen due to electron beam irradiation introduced.

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The Dependence on the Gas Pressure in SF6 Molecular Gas (SF6분자가스의 압력 의존도)

  • Jeon, Byung-Hoon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.9
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    • pp.816-820
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    • 2007
  • We measured the electron drift velocity, W, in 0.5% $SF_6-Ar$ mixture over the E/N range from 30 Td to 300 Td and gas pressure range from 0.1 to 0.5 Torr by the double shutter drift tube with a variable drift distance, and calculated over the same E/N and gas pressure range by using the two-term approximation of the Boltzmann equation. The measured and calculated values at different gas pressure at each E/N was appreciable dependence in the results on the gas pressure.

The analysis of dependence on the gas number density in $SF_{6}$-Ar mixtures ($SF_{6}$-Ar혼합가스에서의 압력 의존도 해석)

  • 전병훈;하성철
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.248-251
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    • 2002
  • We measured the electron drift velocity, W, in 0.5% $SF_{6}$-Ar mixture over the E/N range from 30 Td to 300 Td and gas pressure range from 0.1 to 8 Torr by the double shutter drift tube with a variable drift distance. This coefficient in the mixture was calculated over the same E/N and gas pressure range by using the two-term approximation of the Boltzmann equation. And the measured and calculated values at different gas number density at each E/N was appreciable dependence in the results on the gas number density,

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Electrical Conduction Characteristics of a Thick-film Form Multiwalled Carbon Nanotubes for Field Electron Emitter

  • Lee, Yun-Hi;Kim, Hoon;Ju, Byeong-Kwon;Yu, Jae-Eun;Oh, Myung-Hwan
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.53-54
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    • 2000
  • Measurements of the direct current resistivity, on multiwalled carbon nanotubes(MWNT) for field electron emitter source that had been screen printed in a thick film form were made as a function of temperature T in the range of 1.7K-390K. In this measuring temperature range, the electrical resistivity for the MWNT show that the main contribution to the conductivity comes form carries that hop directly between localized states executing variable range hopping processes. This thick-film form system for large area display showed a high bright light emission as well as very low turn-on field as like an individual MWNT system at room temperature. Furthermore, the electron emission characteristics followed well typical Fowler-Nordheim conduction under the vacuum.

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The Effect of Electron Beam Irradiation on the Electrical Characteristics of Low Density Polyethylene film (I) (저밀도 폴리에틸렌 박막의 전기적 특성에 미치는 전자선의 영향)

  • 조돈찬;신종열;차광훈;이수원;홍진웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.11a
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    • pp.82-85
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    • 1996
  • It is considered that the effect of radiation aging, such as electron beam due to the ultra-high voltage for transmission, on the physical properties and electrical characteristics of electrital insulating materials. Low-density polyethylene(thickness 100[${\mu}{\textrm}{m}$]) is selected as an experimental specimen. Fourier transform infra-red spectrum, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy is used so as to analysis the physical properties, the morphological changes and the crystallinity of LDPE. And it is made an experiments of dielectric characteristics in the temperature range of 20[$^{\circ}C$]~120[$^{\circ}C$], in the frequency range of 30[Hz]~1.5$\times$10$^{5}$ [Hz] and in the applied voltage range of 300[mV]~1500[mV].

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Development of a Wide Dose-Rate Range Electron Beam Irradiation System for Pre-Clinical Studies and Multi-Purpose Applications Using a Research Linear Accelerator

  • Jang, Kyoung Won;Lee, Manwoo;Lim, Heuijin;Kang, Sang Koo;Lee, Sang Jin;Kim, Jung Kee;Moon, Young Min;Kim, Jin Young;Jeong, Dong Hyeok
    • Progress in Medical Physics
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    • v.31 no.2
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    • pp.9-19
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    • 2020
  • Purpose: This study aims to develop a multi-purpose electron beam irradiation device for preclinical research and material testing using the research electron linear accelerator installed at the Dongnam Institute of Radiological and Medical Sciences. Methods: The fabricated irradiation device comprises a dual scattering foil and collimator. The correct scattering foil thickness, in terms of the energy loss and beam profile uniformity, was determined using Monte Carlo calculations. The ion-chamber and radiochromic films were used to determine the reference dose-rate (Gy/s) and beam profiles as functions of the source to surface distance (SSD) and pulse frequency. Results: The dose-rates for the electron beams were evaluated for the range from 59.16 Gy/s to 5.22 cGy/s at SSDs of 40-120 cm, by controlling the pulse frequency. Furthermore, uniform dose distributions in the electron fields were achieved up to approximately 10 cm in diameter. An empirical formula for the systematic dose-rate calculation for the irradiation system was established using the measured data. Conclusions: A wide dose-rate range electron beam irradiation device was successfully developed in this study. The pre-clinical studies relating to FLASH radiotherapy to the conventional level were made available. Additionally, material studies were made available using a quantified irradiation system. Future studies are required to improve the energy, dose-rate, and field uniformity of the irradiation system.

A study on the electron ionization and attachment coefficients ins $SF_6$ gas ($SF_6$ 가스의 전리 및 부착계수에 관한 연구)

  • Seo, Sang-Hyeon;Yu, Heoi-Young;Kim, Sang-Nam;Ha, Sung-Chul
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.10 no.6
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    • pp.96-103
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    • 1996
  • This paper describes the electron transport characteristics in SF6 gas calculated for range of E/N values from 150~ 800[Td) by the Monte Carlo simulation and Boltzmann equation method using a set of electron collision cross sections detennined by the authors and the values of electron swarm parameters are obtained by TOF method. The results gRined that the values of the electron swarm parameters such as the electron drift velocity, the electron ionization or Rttachment coefficients, longitudinal and transverse diffusion coefficients agree with the experimental and theoretical for a range of E/N. The properties of electron avalanches is concerned electron energy non--equilibrium region. The electron energy distributions function were analysed in sulphur hexafluoride at E/N : 500~800[Td) for a case of non-equilibrium region in the mean electron energy. The validity of the results obtained has been confilll1ed by a TOF method.

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A Study on the Electron Transport Coefficients in Hydrogen Molecular ($H_2$의 전자 수송 계수에 관한 연구)

  • Park, Eun-Joo;Jeon, Byung-Hoon
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1402_1403
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    • 2009
  • The electron transport coefficients in hydrogen molecular is calculated over the range of E/N values from 0.01 to 300 Td and at temperature state of 77K, 293K and 300K by Boltzmann equation method. The results gained that the values of the electron transport coefficients such as the electron drift velocity, the electron ionization coefficients, longitudinal diffusion coefficients consisted with the results of measured and calculated for a ranage of E/N.

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Analysis of Electron Transport Coefficients in Low Voltage Air Circuit Breaker Using MCS and BE (몬테칼로 시뮬레이션과 볼츠만 방정식을 이용한 저전압 기중차단기의 전자수송계수 특성파악)

  • 하성철;서상현
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.2
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    • pp.168-172
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    • 2003
  • The electron transport coefficients in Air is analysed in range of E/Nvalues from 100~1000(Td) by a MCS and BE method. This paper have calculated W, ND$\sub$L/, ND$\sub$T/, Mean energy mixtures by N$_2$+O$_2$. The results gained that the values of the electron swarm parameters such as the electron drift velocity, longitudinal and transverse diffusion coefficients.