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A research project on the development of radiation tolerant compact image sensor with a field emitter array started in 2013. The purpose of the project is to develop key components of the image sensor that has sufficiently high radiation tolerance, as a step to investigate the interior of the nuclear reactor of Nuclear Power Plant Fukushima the 1st. A volcano-structured double-gated Spindt-type field...
A study of the field emission properties of ZrO2/W nanoheterostructures (NS) is presented. The NS was represented by a thin (∼10 nm) ZrO2 layer at the tip of a needle-shaped W<100> and W<111> microcrystals. It has been revealed that at temperatures NS substance within 1950K to 2150K the NS shows an abnormally high normalized brightness (up to ∼ 106 A/(cm2 sr V)) and high stability of field...
We describe reliable CNT x-ray tubes and their digital properties such as easy modulation of x-ray dose, high-speed operation, and low-voltage and low-power consumption control with an active-current control unit (ACCU) developed. The simple and advanced ACCU was found to shorten the response time of CNT x-ray tube down to sub-microsecond along with stable and reliable operation. The fast digital...
A re-entrant cavity resonator with carbon nanotubes cold cathode was fabricated. The cold cathode was driven by L band signal and a modulated electron emission of CNTs was achieved. An average current of 3.865 µA was recorded when a 1W/1.572GHz signal was led in the cavity, corresponding density of 193.3 µA/cm2. The highest output power was obtained at nearly 1.6S GHz frequency under 100 mW input.
A simple model of a layered heterostructure was developed in order to simultaneously compute and compare resonant and sequential electron field emission currents. Among other results obtained, it was found that, while various slope changes appear in both current-field characteristics, for the sequential tunneling type of emission the effect is merely a consequence of different field sensitivity of...
First principle calculations based on density functional theory has been performed to study the work function or electron affinity and ionization potential of two-dimensional atomic crystals of carbon family, group-III-nitride family and transition-metal dichalcogenide family. Silicene is found to have the largest ionization potential and electron affinity in carbon family. The electron affinity (ionization...
The analogy between the electron wave nature in graphene electronics and the electromagnetic waves in dielectrics has suggested a series of optical-like phenomena have drawn considerable attentions. One of them is the graphene-based electron waveguides [1–4], which will be useful for various graphene-based devices, such as electronic fiber [5]. The guided modes for an asymmetric double-well potential...
On the basis of summation of previous electron transit time relations for the cylindrical microelectronics device, calculated mathematically the typical value of the electron transit time at the Terahertz region for cylindrical vacuum microelectronics diode, by using of the method of an equivalent diode, approximately calculated a typical value of the electron transit time at the Terahertz region...
This conference presentation is part of continuing work to clarify the theory of cold field electron emission (CFE). It addresses the issue that some general physics textbooks and many published experimental papers use one or more CFE equations that are known to CFE theoreticians to be defective. These defective equations have been in wide use for 15 years or more: they impede the interpretation of...
Graphene/metallic hybrid transparent network were prepared by covering metallic network with graphene films grown by chemical vapor deposition (CVD). These network hybrid electrodes exhibited excellent optical and electrical properties with 90.3% at 550nm and 30 Ω sq−1. Moreover, the graphene/metallic network hybrid films are flexible on a plastic substrate with long-term stability and reliability,...
New thermal field electron emission energy conversion method for vacuum electron-optical systems (EOS) with a nanostructured surface electron sources is offered and developed. Physical and numerical modeling of an electron emission and transport processes for different EOS is carried out. It is shown that at the specific configuration of electrostatic and magnetic fields in the EOS offered method...
BaO nanostructure was successfully synthesized by a chemical bath deposition method. The morphology, microstructure, and composition of the BaO nanostructure were characterized by field emission scanning electron microscopy. The BaO nanostructure showed good field emission properties, and the emitters constructed of BaO nanostructure exhibited a low turn-on field, a low threshold field, a high field...
A sheet electron beam source is demonstrated using a line-shape carbon nanotube (CNT) field emitter. The line-shape CNT field emitter shows large emission current under the small applied voltage. Moreover, the emitted electron is well-confined without any focusing lens.
We have constructed an ultra-high vacuum system which provides two ways of spectroscopy for cold cathodes in adjustable triode configuration under high electric fields (< 70 MV/m) and pulsed tunable laser illumination (3.5 ns, 10 Hz, 0.5–5.9 eV, < 17 mJ). Sensitive direct spectroscopy with high resolution (< 14 meV) of DC and laser-pulsed emission as well as photon energy dependent quantum...
In order to develop miniaturized and integrated electron vacuum devices, the multi-beam modulation in a carbon nanotube (CNT) cold cathode electron gun is investigated. Steady field-emission electron beams are modulated in an electron gun by feeding a high-frequency field between the cathodes and the anode. Simulation results of multi-beam electron gun show that phase modulation of beam can be controlled...
We study comparatively Fowler-Nordheim (FN) and Schottky-Nordheim (SN) models to give a criterion to identify the image potential effect in the field emission from non-metallic emitters, which can be applied to distinct the metallic and non-metallic properties of the field emission from the experimental data.
This conference poster introduces changes in the terminology used to present Fowler-Nordheim (FN) theory. The underlying aim is to make theoretical discussion more scientific.
On the physical aspects of Heavy Ion Tumor Therapy (HITT), accurate determination of specific energy loss (SEL) or stopping power is very important to the improvement of modeling the relative biological effectiveness and developing powerful computer algorithms for treatment planning. In this work, the relativistic version of the Bethe-Bloch formula is revisited and SEL of heavy ions in water is calculated...
We have fabricated pointed graphite emitters (PGEs) from a thin graphite foil by a rather simple cutting technique. After a sudden activation, PGEs reproducibly provide currents up to 3 mA at 4 V/µm, and after 2 h conditioning a nearly stable current of 500 µA over 10 h. Luminescent screen images reveal multiple field emitters from fluctuating spots. Such a PGE was used as reliable electron source...
The results of modeling and development of planar multielectrode current sources based on nanoscale carbon structures with the low-threshold field emission are described. Mechanism of low-threshold field emission can be explained by the model, which describes the efficiency of tunneling of electrons from the carbon film into vacuum due to the existence of nanoscale clusters of two phases of DLC -...
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