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electron optics 電子光學。

electron telescope

A highly efficient numerical algorithm by using multi - grid method ( mgm ) is introduced to solve the three dimensional field distribution in the present paper . formulae of the restriction and prolongation in mgm computation is deduced , and a 3d program of mgm is accomplished , which can solve the field distributions in electron optical systems for various electrostatic lenses . the 3d field distribution in an electrostatic concentric spherical model is tested with mgm algorithm and an algorithm based on finite difference method ( fdm ) respectively . comparing these two results in view of computational efficiency and computational accuracy , it appears that mgm is superior to fdm in solving electrostatic field distribution for the electron optics problem . this paper shows that the 3d field computation using mgm greatly improves the computational efficiency of field distributions in electron optical systems and shortens the computational time 本文將一種高效率的數值計算方法? ?多重網格法引入三維靜電場分布的計算,多重網格法利用限制和延拓可迅速求得滿足精度要求的場分布.研究了求解各種靜電透鏡電子光學系統三維場分布的多重網格法程序,驗算了靜電同心球模型的三維場分布.通過與目前在場計算中常用的有限差分法進行比較,可以看出多重網格法的計算效率和計算精度優于有限差分法.本文表明利用多重網格法計算三維場大大提高了場分布的計算效率,縮短了計算時間,因此為后續計算打下了良好的基礎

Plasma technique was introduced in the research of high power microwave ( hpm ) sources in recent decade . the performance of hpm sources is improved much by filling plasma which is promising in this field . filled - plasma travelling - wave tubes ( fptwt ) is a part of them . it is the main task of this paper to research and design fptwt ' s electron optics system and simulate it 近十年來,在高功率微波的研究熱潮中,引入了等離子體技術。引入等離子體能顯著改善高功率微波源各方面的工作性能,已經成為高功率微波源發展一個頗有前景的新方向,等離子體行波管即是其一個典型代表。

However , the manufacture process of twt is so complicated that many kinds of subject , such as electron optics , magnetics , cathode electronics , microwave electronics , electronmagnetic fields theory , material science , mechanics and calorifics are involved in 行波管的研制涉及到電子光學、磁學、陰極電子學、微波電子學、電磁場理論、材料學、機械與熱分析諸多學科,工藝過程十分復雜。

The methods that will be discussed are based on concepts derived from various fields , namely electron optics , the interaction of electrons with crystals , elasticity theory , crystal defect theory and crystallography 我們要討論的途徑是以源自多種領域的觀念為基礎,也就是電子眼,電子和晶體之間的干擾,彈性理論,晶體缺陷理論和結晶學。

The main works of the dissertation are listed as following : fist , know the theorical basis and software use of egun , magic . represent the theory and calculation method of electron optics 本文主要工作如下:掌握egun 、 pic粒子模擬程序兩種軟件設計電子槍的理論基礎,熟悉軟件使用,闡述電子光學系統的基礎理論與計算方法。

Methods of electrode designation for electron optics system of electron beam tubes 電子束管電子光學系統電極命名方法