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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...
A novel method for fabricating a small-sized carbon nanotube (CNT) emitter was developed. The emitter was fabricated by contacting the tungsten probe covered with CNT paste to the surface of Kovar rod, and then the brightness of electron beam generated from the CNT paste emitter was measured. We obtained the virtual source size of 1.13 × 10−10 m2 and the brightness of 1.2 × 107 A m−2sr−1 at an applied...
We have developed a super-miniaturized X-ray tube with an outer diameter of 2 mm. Highly adhesive CNT field emitters were used as an electron source for super-miniaturized X-ray tube. We observed stable operation of the developed super-miniaturized X-ray tube, showing a clear X-ray image of an object.
We analyzed the failure mechanism in miniature x-ray tubes with a gated carbon nanotube (CNT) field emitter. The miniature x-ray tube even with a small leakage current of field emission from the CNT emitters to the gate electrode has some distortion of the electron beam trajectory from the cathode to anode passage, causing a charging at insulating parts. The charging at the insulator spacer would...
We have designed and fabricated a highperformance carbon nanotube (CNT) field emitter for a vacuum-sealed X-ray tube by a brazing process. The developed high-temperature endurable CNT emitters were vacuum-sealed in the diode and triode configurations, showing little degradation upon the brazing process and a good cold cathode of X-ray tube.
We have successfully operated the vacuum-sealed pentode X-ray tube with carbon nanotube (CNT) field emitters. Each component of the X-ray tube was sealed by a two-step brazing process in a vacuum furnace. The robust CNT emitter was specially developed for high-temperature endurance during the vacuum brazing process.
In recent, field emission lamp (FEL) with carbon nanotube (CNT) field emitters was intensively studied for a high performance back light unit (BLU) in LCD. The CNT-FEL can give a local dimming BLU increasing contrast ratio, reducing motion blur and saving power consumption. The local FE blocks, in general, are arranged in a matrix format and addressed by voltage pulse signals. In this method the row...
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