計算場發(fā)射系統(tǒng)尖端形狀系數(shù)的半經(jīng)驗公式
A SEMIEMPIRICAL FORMULA FOR THE SHAPE FACTOR OF EMISSION TIP IN GENERAL FIELDE MISSION SYSTEM
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摘要: 本文提出了一般場發(fā)射系統(tǒng)尖端形狀系數(shù)的計算公式:0.2/[(r0+h)ln(2h/r0)]。用該公式和數(shù)值計算法以及D.Selidovkin,W.Swanson和P.Dyke等人提出的相應(yīng)公式,分別對尖端呈半球形、橢球形、旋轉(zhuǎn)拋物形和雙曲形四種場發(fā)射系統(tǒng)的值進(jìn)行了計算和比較。結(jié)果表明,用本文的公式所得的值與電子計算機(jī)的數(shù)值計算結(jié)果基本上是一致的。
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關(guān)鍵詞:
- 場發(fā)射; 系統(tǒng)發(fā)射尖端; 尖端形狀系數(shù)
Abstract: A new formula (0.2/[(r0+h)ln (2h/r0)]) which is used to determine the shape factor of field emission tip is reported. By using of this formula, the calculation of with the tip shape of half spheroid, rotational ellipsoid, rotational paraboloid and rotational hyperboloid have been made and compared with the calculated value of by D. Selidovkin, W. Swanson and P. Dyke and numerical method. It is shown that the value of calculated by using of the new formula is consistent with the result of calculation by computer and is more precise than that calculated by using of other method. -
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