Title :
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
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;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2015.2404874
