Lai Sheng, Tang Xiaobin, Liu Yunpeng, Mu Junxu, Feng Zhaopeng, Miao Kai
Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China.
Key Laboratory of Nuclear Technology Application and Radiation Protection in Astronautics, Ministry of Industry and Information Technology, Nanjing 210016, People's Republic of China.
Nanotechnology. 2021 Nov 24;33(7). doi: 10.1088/1361-6528/ac378b.
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.
碳纳米管（CNT）场发射X射线源因其可控制的发射和瞬时响应，在X射线通信（XCOM）中具有巨大潜力。本文提出了一种新型的电压加载模式，以实现高频脉冲X射线发射。研究了阴极电流和脉冲X射线随电压、频率和脉冲幅度的特性，并进行了XCOM数据传输实验。结果表明，CNT冷阴极X射线源作为通信信号源，可在1.05 MHz的脉冲发射频率下工作。当栅极电压高于470 V时，脉冲X射线波形幅度达到峰值，形状呈现伪方波。X射线波形的占空比超过50%，当脉冲频率达到1 MHz时达到56%。在XCOM数据传输实验中，在不同脉冲发射频率下，脉冲X射线波形与加载数据信号电压波形良好一致。本文实现了CNT冷阴极X射线源的X射线高频脉冲发射，为CNT冷阴极X射线源在XCOM中的开发和应用奠定了基础。
