Title :
Field-emission X-ray sources with an anisotropic focusing lens for isotropic X-ray focal spots
Author :
Jung, Sunshin ; Chang, Won Suk ; Kim, Beom Seok ; Kim, Daeho ; Seol, Seung Kwon ; Park, Kyu Chang ; Lee, Yang Doo ; Ju, Byeong-Kwon ; Park, Hun-Kuk
Author_Institution :
Adv. Med. Device Res. Center, Korea Electrotechnol. Res. Inst., Ansan, South Korea
Abstract :
Hermetic-sealed field-emission X-ray sources with an anode voltage and current of 70 kV and 0.5 mA have been developed using an anisotropic focusing electron lens structure for an isotropic focal spot. The anisotropic focusing of an electron beam was achieved using an electrostatic electron lens with anisotropic aperture geometry integrated in a gate (or grid) electrode. The anisotropic geometry has an influence on the electron beam with different horizontal and vertical electric fields, thereby anisotropically focusing the beam on an anode target.
Keywords :
X-ray imaging; electrodes; electron beams; electron field emission; electrostatic lenses; hermetic seals; X-ray images; anisotropic aperture geometry; anisotropic focusing electron lens structure; anode voltage; current 0.5 mA; electron beam; electrostatic electron lens; field-emission X-ray sources; gate electrode; hermetic-sealed field-emission X-ray sources; horizontal electric fields; isotropic X-ray focal spots; isotropic focal spot; vertical electric fields; voltage 70 kV; Anodes; Carbon nanotubes; Educational institutions; Electron beams; Focusing; Lenses; Spatial resolution; carbon nanotube emitter; effective focal spot; field-emission X-ray source; focusing lens;
Conference_Titel :
Vacuum Nanoelectronics Conference (IVNC), 2012 25th International
Conference_Location :
Jeju
Print_ISBN :
978-1-4673-1983-6
Electronic_ISBN :
pending
DOI :
10.1109/IVNC.2012.6316838
