Investigation of the concept of a miniature X-ray source based on nanoscale vacuum field-emission triode controlled by cut-off grid voltage

Djuzhev, N. A.; Demin, G. D.; Gryazneva, Tatiana A.; Kireev, V. Yu.; Novikov, D. L.

doi:10.1109/eiconrus.2018.8317498

Cited by 3 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since the discovery of CNTs in 1991, as one-dimensional nanomaterials, CNTs have been considered as one of the most promising cold cathode materials due to their nano-scale and cutting-edge stable physical and chemical properties [ 8 , 9 ] and excellent mechanical properties [ 10 ]. It is easy to obtain the X-ray source with a small electron focal spot and programmable pulse imaging [ 11 ] because of the concentrated electron emission direction of CNTs [ 12 ], meaning femtosecond pulse electron emission can be achieved [ 13 ]. The emission current density of a single carbon nanotube can reach

A/cm

[ 14 ]; however, it is difficult to produce a uniform strong electric field on the surface with the increase in the emission area, which leads to the rapid decrease in the emission current density.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Optimization of CNTs Cold Cathode Emission Grid Structure

et al. 2022

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) show significant advantages in the development of cold cathode X-ray tubes due to their excellent field emission performance; however, there are still some problems, such as short lifetime and the low emission current of large-area CNTs. In this paper, a front-grid carbon nanotube array model was established, and the electric field intensity near the tip of the CNTs’ electric field enhancement factor was analytically calculated. A simulation model of a CNT three-dimensional field emission electron gun was established by using computer simulation technology (CST). The effects of grid wire diameter, grid aperture shape, and the distribution of grid projection on the cathode surface on the cathode current, anode current, and electron transmission efficiency were analyzed. The aperture ratio was used to evaluate the grid performance, and the simulation results show that the ideal aperture ratio should be between 65% and 85%. A grid structure combining a coarse grid and a fine grid was designed, which can make the electric field intensity around the grid evenly distributed, and effectively increased the cathode emission current by 24.2% compared with the structure without the fine grid. The effect of grid aperture ratio on the electron transmission efficiency was tested. The simulation results and optimized structure can provide a reference for the grid design of cold cathode emission X-ray tubes.

show abstract

A/cm

Section: Introductionmentioning

confidence: 99%

Simulation and Optimization of CNTs Cold Cathode Emission Grid Structure

et al. 2022

View full text Add to dashboard Cite

show abstract

“…В настоящее время наблюдается стремительное возрождение одного из ключевых направлений физики -автоэмиссионной электроники, где за последние несколько лет были достигнуты впечатляющие результаты, как в области прорывных экспериментальных исследований [1][2][3][4], так и в отношении успешной реализации прототипов твердотельных электронных устройств на ее основе (диодов [5,6], транзисторов [7,8], наносенсоров [9], портативных рентгеновских трубок [10] и т. д.).…”

Section: Introductionunclassified

Оптимизация Анодной Мембраны С Прострельной Мишенью В Системе Источников Мягкого Рентгеновского Излучения Для Проведения Процессов Рентгеновской Нанолитографии

Глаголев¹,

Демин²,

Орешкин³

et al. 2020

Журнал Технической Физики

View full text Add to dashboard Cite

In this paper, we propose a method for optimizing the design and composition of the anode membrane with a transmission-type target as part of a system of soft X-ray sources based on field-emission triodes for performing tasks in the field of X-ray nanolithography. It allows to prevent the degradation of the operating characteristics of the system when significant electrostatic deformation of the anode occurs under the influence of a control electric field in the inter-electrode space of the triodes. For this purpose, the inclusion of an additional control electrode in the system design is considered, which makes it possible to compensate for the deformation of the anode membrane to an acceptable level and thereby stabilize the operation of X-ray sources. A numerical model of the electrostatic deflection of the anode assembly in a modified design is developed, based on which the optimal composition and geometric parameters of the anode membrane with a compensating electrode are determined. In particular, the optimal distance between the anode membrane in the initial (undeformed) state and the compensating electrode was found (equal to 5 μm), at which a minimum voltage difference (about 1.15 kV) should be applied to these electrodes to prevent critical deflection of the membrane (0.72 μm with a membrane radius of 750 µm). It is also shown that, due to their extremely high hardness (>80 GPa), diamond-like films are the most promising material for the anode electrode. The results obtained can also be useful for the development of miniature X-ray generation devices for various applications.

show abstract

Optimization of an Anode Membrane with a Transmission-Type Target in a System of Soft X-Ray Sources for X-Ray Nanolithography

et al. 2020

View full text Add to dashboard Cite

Investigation of the concept of a miniature X-ray source based on nanoscale vacuum field-emission triode controlled by cut-off grid voltage

Cited by 3 publications

References 11 publications

Simulation and Optimization of CNTs Cold Cathode Emission Grid Structure

Simulation and Optimization of CNTs Cold Cathode Emission Grid Structure

Optimization of an Anode Membrane with a Transmission-Type Target in a System of Soft X-Ray Sources for X-Ray Nanolithography

Contact Info

Product

Resources

About