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

Lai, Soon Onn; Tang, Xiaobin; Liu, Yunpeng; Mu, J.; Feng, Zhaopeng; Miao, Kai

doi:10.1088/1361-6528/ac378b

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…These studies built a solid foundation for XCOM development. In addition, Tang et al conducted a series of studies regarding XCOM, including the penetrative properties of X-rays [14], X-ray high frequency pulse emission characteristics [15], and collimating/ focusing optical systems [16]. The potential applications of XCOM in the Mars scenario [3,17] and during Earth reentry [18][19][20] were also studied.…”

Section: X-ray Communication (Xcom) Is a Revolutionary Technique In S...mentioning

confidence: 99%

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Song,

Lu,

Wang

2023

International Journal of Aerospace Engineering

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X-ray communication (XCOM) is an emerging laser communication technique for deep space applications. Traditional link acquisition of laser communications depends significantly on Earth support and shows little autonomy. For XCOM, a pulsar vector observation-based link acquisition method is proposed, which utilizes noncooperative pulsars in deep space as beacons to acquire absolute attitude information and accomplish link acquisition. Firstly, a pulsar vector observation model was established based on the coordinate definition of the X-ray detector and X-ray collimator model. Secondly, a modified “success-failure” pulsar vector search algorithm with two degrees of freedom was proposed to acquire the pulsar vector. With the pulsar vector and the relative attitude obtained from inertial sensors, the link acquisition pointing vector could be determined. Finally, the performance of the proposed method was evaluated using numerical experiments, and factors that influence the performance are discussed and analyzed.

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Section: X-ray Communication (Xcom) Is a Revolutionary Technique In S...mentioning

confidence: 99%

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Song,

Lu,

Wang

2023

International Journal of Aerospace Engineering

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“…So far, the temporal responses of several kinds of quasi-one-dimensional field emitters have been reported. It is found that the response time of CNT can be down to ~100 ns [19,20], while that for individual SiC nanowire is ~1 ms [21]. For ZnO nanowire, the response time is tens of microseconds in a MOSFET controlled device [22].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Temporal Response of Gated ZnO Nanowire Field Emitter by Considering the Charging and Self-Heating Effect for Improving the Response Speed

Chen,

Wang,

Song

et al. 2024

Electronics

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ZnO nanowire is a promising candidate for large-area gated field emitter arrays. How to improve its temporal response is one of the key problems to be solved for applications. In this work, a device model for a gated ZnO nanowire field emitter with consideration of charging and self-heating effect has been established to investigate its temporal response. It is found that while the charging effect is responsible for the delay at the beginning of the pulse, the self-heating effect which induces delay due to the thermal conduction process can shorten the charging time because of its lowering of nanowire resistance. The response time can be minimized when these two effects are balanced at an optimal field which is below the critical field for thermal runaway. We further investigate the optimal response time of a nanowire with the same resistance but a different length, radius, and electrical properties. The results imply that a lower heat capacity and higher critical temperature for thermal runaway are in favor of a shorter response time, which must be taken into account in the reduction in nanowire resistance for improving response speed. All the above should be useful for the device design of a fast-response gated ZnO nanowire field emitter array.

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“…Furthermore, it can be miniaturized via modern micro-fabrication techniques. All these advantages make it promising in the realization of a high-performance vacuum electron source [1][2][3][4][5][6] as well as other novel applications such as flat panel field emission display [7][8][9], parallel electron beam lithography [10,11] and flat panel X-ray source [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Cold Cathodes with Two-Dimensional van der Waals Materials

Chen,

2023

Nanomaterials

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Two-dimensional van der Waals materials could be used as electron emitters alone or stacked in a heterostructure. Many significant phenomena of two-dimensional van der Waals field emitters have been observed and predicted since the landmark discovery of graphene. Due to the wide variety of heterostructures that integrate an atomic monolayer or multilayers with insulator nanofilms or metallic cathodes by van der Waals force, the diversity of van der Waals materials is large to be chosen from, which are appealing for further investigation. Until now, increasing the efficiency, stability, and uniformity in electron emission of cold cathodes with two-dimensional materials is still of interest in research. Some novel behaviors in electron emission, such as coherence and directionality, have been revealed by the theoretical study down to the atomic scale and could lead to innovative applications. Although intensive emission in the direction normal to two-dimensional emitters has been observed in experiments, the theoretical mechanism is still incomplete. In this paper, we will review some late progresses related to the cold cathodes with two-dimensional van der Waals materials, both in experiments and in the theoretical study, emphasizing the phenomena which are absent in the conventional cold cathodes. The review will cover the fabrication of several kinds of emitter structures for field emission applications, the state of the art of their field emission properties and the existing field emission model. In the end, some perspectives on their future research trend will also be given.

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

Cited by 10 publications

References 25 publications

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Modeling the Temporal Response of Gated ZnO Nanowire Field Emitter by Considering the Charging and Self-Heating Effect for Improving the Response Speed

Cold Cathodes with Two-Dimensional van der Waals Materials

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