X-ray high frequency pulse emission characteristic and application of CNT cold cathode x-ray source cathode x-ray source

Abstract Carbon nanotube (CNT) field-emission X-ray source has great potential in X-ray communication (XCOM) because of its controllable emission and instantaneous response. A novel voltage loading mode was proposed in this work to achieve high-frequency pulse X ray-emission. The characteristics of cathode current and pulse X-ray versus voltage, frequency, and pulse amplitude were studied, and XCOM data transmission experiment was carried out. Results showed that the CNT cold cathode X-ray source, as a communication signal source, could work in 1.05 MHz pulse emission frequency. When the grid voltage was higher than 470 V, the pulse X-ray waveform amplitude achieved peak, and the shape exhibited a pseudo square wave. The duty cycle of the X-ray waveform exceeded 50%, reaching 56% when the pulse frequency reached 1 MHz. In the XCOM data transmission experiment, the pulsed X-ray waveform was well consistent with the loading data signal voltage waveform under different pulse-emission frequencies. This work realized the X-ray high-frequency pulse emission of CNT cold cathode X-ray source and lays a foundation for the development and application of CNT cold cathode X-ray source in XCOM.

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High Frequency x-Ray Pulsed Source and the Method for Wireless Data Transmission

Физические основы приборостроения ◽

10.25210/jfop-1904-038047 ◽

2019 ◽

Vol 8 (4) ◽

pp. 38-47

Author(s):

V.V. Grebenshchikov ◽

◽

A.S. Dmitriev ◽

A.I. Nechaev ◽

N.N. Potrakhov ◽

...

Keyword(s):

Data Transmission ◽

High Frequency ◽

Wireless Data ◽

X Ray ◽

Wireless Data Transmission

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The Microstructure of Steatite (Protoenstatite)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118102 ◽

1985 ◽

Vol 43 ◽

pp. 236-237

Author(s):

W. E. Lee ◽

A. H. Heuer

Keyword(s):

High Frequency ◽

Glass Ceramics ◽

Magnesium Silicate ◽

Beam Current ◽

Glassy Matrix ◽

Angle Of Incidence ◽

X Ray ◽

Mechanical And Electrical Properties ◽

Argon Ions ◽

High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

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Controllable Growth of Tree-Like Freestanding Electrodes Induced by High-Frequency Pulse Currents for Efficient Water Splitting and Pseudocapacitance

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.1c01490 ◽

2021 ◽

Author(s):

Fan Zhang ◽

Renjie Ji ◽

Shuaichen Lu ◽

Yating Wang ◽

Zhijian Li ◽

...

Keyword(s):

Water Splitting ◽

High Frequency ◽

Controllable Growth ◽

Frequency Pulse

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Sintering, Microstructure, and Dielectric Properties of Copper Borates for High Frequency LTCC Applications

Materials ◽

10.3390/ma14144017 ◽

2021 ◽

Vol 14 (14) ◽

pp. 4017

Author(s):

Dorota Szwagierczak ◽

Beata Synkiewicz-Musialska ◽

Jan Kulawik ◽

Norbert Pałka

Keyword(s):

Dielectric Properties ◽

Dielectric Permittivity ◽

High Frequency ◽

Ceramic Materials ◽

Sintering Behavior ◽

Terahertz Time Domain Spectroscopy ◽

Very High Frequency ◽

X Ray ◽

Low Dielectric ◽

Very High

New ceramic materials based on two copper borates, CuB2O4 and Cu3B2O6, were prepared via solid state synthesis and sintering, and characterized as promising candidates for low dielectric permittivity substrates for very high frequency circuits. The sintering behavior, composition, microstructure, and dielectric properties of the ceramics were investigated using a heating microscope, X-ray diffractometry, scanning electron microscopy, energy dispersive spectroscopy, and terahertz time domain spectroscopy. The studies revealed a low dielectric permittivity of 5.1–6.7 and low dielectric loss in the frequency range 0.14–0.7 THz. The copper borate-based materials, owing to a low sintering temperature of 900–960 °C, are suitable for LTCC (low temperature cofired ceramics) applications.

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