Design and development of Thermionic Emission Microscope

Author

Barik, Rabindra K. ; Raju, R.S. ; Das, Supriyo ; Rathore, Sneh

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea

fYear

2011

fDate

21-24 Feb. 2011

Firstpage

71

Lastpage

72

Abstract

Thermionic Emission Microscope (THEM) developed at CEERI has an electrostatic immersion lens to magnify the image. The geometry of lens and potentials are optimized to achieve a magnification of about 15 times with a clear image. The design of deflection plates and lens are carried out using OmniTRAK 3-D to ensure required deflection of beam without losing laminarity and beam interception with plates. Faraday cage, containing a narrow aperture, is designed to obtain elemental currents with low secondary emission. The emission picture of a B-Type cathode has been obtained. The results are satisfactory.

Keywords

Faraday effect; electrostatic lenses; optical design techniques; thermionic emission; B-type cathode; CEERI; Faraday cage; OmniTRAK 3D; beam deflection; beam interception; deflection lens; deflection plates; electrostatic immersion lens; lens geometry; secondary emission; thermionic emission microscope; Apertures; Cathodes; Lenses; Microscopy; Solid modeling; Thermionic emission; Trajectory; Dispenser cathode; OmniTRAK; THEM;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2011 IEEE International

Conference_Location

Bangalore

Print_ISBN

978-1-4244-8662-5

Type

conf

DOI

10.1109/IVEC.2011.5746880

Filename

5746880