Electrostatic Focusing Lens Module With Large Focusing Capability in Carbon Nanotube Emitter-Based X-Ray Sources

Author

Jae-Woo Kim ; Min-Sik Shin ; Jin-Woo Jeong ; Jun-Tae Kang ; Sungyoul Choi ; Sora Park ; Ji-Hwan Yeon ; Seungjoon Ahn ; Yoon-Ho Song

Author_Institution

Sch. of Adv. Device Technol., Univ. of Sci. & Technol., Daejeon, South Korea

Volume

36

Issue

4

fYear

2015

fDate

Apr-15

Firstpage

396

Lastpage

398

Abstract

We fabricated and analyzed an electrostatic focusing lens (FL) module comprising a micro-FL with many holes near the gate and a macro-FL of single aperture toward the anode for carbon nanotube (CNT) emitter-based X-ray sources. The micro-FL suppresses the divergence of the electron beams whereas the macro-FL governs the shape of the beam bundle. The FL module can be controlled over a wide range of gate and anode voltages while maintaining the focal spot. We achieved a small focal spot of 300 μm from CNT emitter dot arrays of 10 mm × 1.6 mm with line pairs of 3 lp/mm maintained for different anode voltages.

Keywords

carbon nanotubes; electrostatic lenses; focusing; modules; CNT; FL module; carbon nanotube emitter-based X-Ray source; electron beam divergence; electrostatic focusing lens module; focal spot; focusing capability; macro-FL; micro-FL; single aperture; Anodes; Electron tubes; Focusing; Frequency selective surfaces; Lenses; Logic gates; X-ray imaging; Carbon nanotube; Electrostatic focusing lens; Field emission; Multiple-energy X-ray; X-ray source; electrostatic focusing lens; field emission; multiple-energy X-ray;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2015.2404874

Filename

7045452