采用质点网格法(particle in cell),利用MAGIC软件模拟了场致发射的物理过程.对两种典型的场致发射模型(Spindt阴极发射体和金刚石薄膜发射体)分别进行了模拟.对Spindt阴极发射,研究了发射特性与尖端尺寸,尖端与栅极面的相对高度的关系...采用质点网格法(particle in cell),利用MAGIC软件模拟了场致发射的物理过程.对两种典型的场致发射模型(Spindt阴极发射体和金刚石薄膜发射体)分别进行了模拟.对Spindt阴极发射,研究了发射特性与尖端尺寸,尖端与栅极面的相对高度的关系.对金刚石薄膜发射,比较了三极管和四极管的发射特性,以及薄膜面积对发射特性的影响,得出金刚石薄膜发射体优于Spindt发射体的特性.展开更多
We investigated the cathode luminescence characteristics of CsI(Na)and CsI(Tl)crystals by the spectrum and structure properties at room temperature.We fabricated three different sizes of CsI(Na)and CsI(Tl)crystals and...We investigated the cathode luminescence characteristics of CsI(Na)and CsI(Tl)crystals by the spectrum and structure properties at room temperature.We fabricated three different sizes of CsI(Na)and CsI(Tl)crystals and measured their luminescence spectra under cathode rays.We found that CsI(Na)cathode luminescence peaks appear at 420 and 305 nm,and CsI(Tl)cathode luminescence peaks are 540 and 410 nm,the grain size affects CsI(Na)luminescence significantly,and the Na-related420 nm luminescence intensified relatively when the average grain size reaches^20μm,which becomes weak when the grain size is down to nano-scale.But the cathode luminescence spectra of CsI(Tl)crystals with different size have no obvious changes.Our explanations for these phenomena are that the different impurities in the same host material CsI lead to different luminescence mechanisms.These cathode luminescence characteristics indicate the suitability of CsI(Na)and CsI(Tl)crystals to match photomultiplier tube for large area crystal detector development.展开更多
文摘采用质点网格法(particle in cell),利用MAGIC软件模拟了场致发射的物理过程.对两种典型的场致发射模型(Spindt阴极发射体和金刚石薄膜发射体)分别进行了模拟.对Spindt阴极发射,研究了发射特性与尖端尺寸,尖端与栅极面的相对高度的关系.对金刚石薄膜发射,比较了三极管和四极管的发射特性,以及薄膜面积对发射特性的影响,得出金刚石薄膜发射体优于Spindt发射体的特性.
基金supported by the Fundamental Research Funds for the Central Universities(Grant No.11QG14)
文摘We investigated the cathode luminescence characteristics of CsI(Na)and CsI(Tl)crystals by the spectrum and structure properties at room temperature.We fabricated three different sizes of CsI(Na)and CsI(Tl)crystals and measured their luminescence spectra under cathode rays.We found that CsI(Na)cathode luminescence peaks appear at 420 and 305 nm,and CsI(Tl)cathode luminescence peaks are 540 and 410 nm,the grain size affects CsI(Na)luminescence significantly,and the Na-related420 nm luminescence intensified relatively when the average grain size reaches^20μm,which becomes weak when the grain size is down to nano-scale.But the cathode luminescence spectra of CsI(Tl)crystals with different size have no obvious changes.Our explanations for these phenomena are that the different impurities in the same host material CsI lead to different luminescence mechanisms.These cathode luminescence characteristics indicate the suitability of CsI(Na)and CsI(Tl)crystals to match photomultiplier tube for large area crystal detector development.
