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云南大学物理系研制设计的《YUP-2型双枪脉冲电子二次发射系数测量装置》于1990年5月29日通过技术鉴定.鉴定委员会认为,“该装置在国内达到了领先水平,填补了我国的空白。” 这套系统是测量金属、半导体、及介质薄膜的二次电子发射系数及二次发射特性曲线的大型通用型精密仪器.由于采用双电子枪——其一为测量枪,提供脉动的一次电流;另一为平衡枪,提供均匀的电子束流作为电荷补充,可以消除绝缘介质表面的充电效应,故,《YUP—2》主要用于难度大的介质材料二次发射系数的测量.采用无油超高真空机组
The “YUP-2 Double-gun Pulsed Electronic Secondary Emissivity Measurement Device” developed by Department of Physics of Yunnan University passed the technical appraisal on May 29, 1990. The appraisal committee believes that “the device has reached the advanced level in China and filled in China’s blank. ”This system is a large universal precision instrument for measuring the secondary electron emission coefficient and secondary emission characteristic curve of metals, semiconductors, and dielectric films.Because of the use of dual electron guns - one of which is a measuring gun, providing pulsation Of the primary current; the other is a balanced gun, providing a uniform electron beam as a charge supplement, you can eliminate the charging effect of insulating medium surface, so, “YUP-2” is mainly used for difficult secondary dielectric material measurement of the dielectric constant Uses oil-free ultra-high vacuum unit