Title :
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
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;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2011 IEEE International
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-8662-5
DOI :
10.1109/IVEC.2011.5746880
