Study on a High Beam Transparency Gridded X-ray Electron Gun Based on Carbon Nanotube Cold Cathode

2018 ◽  
Vol 13 (9) ◽  
pp. 1265-1270 ◽  
Author(s):  
Qingyun Chen ◽  
Xuesong Yuan ◽  
Yu Zhang ◽  
Hailong Li ◽  
Bin Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electron Gun ◽  
Cold Cathode ◽  
High Beam ◽  
X Ray

scholarly journals Theoretical Study of a 0.22 THz Backward Wave Oscillator Based on a Dual-Gridded, Carbon-Nanotube Cold Cathode

2018 ◽  
Vol 8 (12) ◽  
pp. 2462 ◽  
Author(s):  
Qingyun Chen ◽  
Xuesong Yuan ◽  
Matthew Cole ◽  
Yu Zhang ◽  
Lin Meng ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Output Power ◽  
Current Density ◽  
Compression Ratio ◽  
Cathode Surface ◽  
Electron Gun ◽  
Cold Cathode ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

The carbon nanotube (CNT) cold cathode is an attractive choice for millimeter and terahertz vacuum electronic devices owning to its unique instant switch-on and high emission current density. A novel, dual-gridded, field emission architecture based on a CNT cold cathode is proposed here. CNTs are synthesized directly on the cathode surface. The first separating grid is attached to the CNT cathode surface to shape the CNT cathode array. The second separating grid is responsible for controlled extraction of electrons from the CNT emitters. The cathode surface electric field distribution has been improved drastically compared to conventional planar devices. Furthermore, a high-compression-ratio, dual-gridded, CNT-based electron gun has been designed to further increase the current density, and a 21 kV/50 mA electron beam has been obtained with beam transparency of nearly 100%, along with a compression ratio of 39. A 0.22 THz disk-loaded waveguide backward wave oscillator (BWO) based on this electron gun architecture has been realized theoretically with output power of 32 W. The results indicate that higher output power and higher frequency terahertz BWOs can be made using advanced, nanomaterial-based cold cathodes.

scholarly journals Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1768 ◽  
Author(s):  
Yifan Zu ◽  
Xuesong Yuan ◽  
Xiaotao Xu ◽  
Matthew T. Cole ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Output Power ◽  
Radiation Source ◽  
Low Voltage ◽  
High Current Density ◽  
Electron Gun ◽  
Mode Competition ◽  
Thz Radiation ◽  
Cold Cathode ◽  
Average Output

Carbon nanotube (CNT) cold cathodes are proving to be compelling candidates for miniaturized terahertz (THz) vacuum electronic devices (VEDs) owning to their superior field-emission (FE) characteristics. Here, we report on the development of a multi-sheet beam CNT cold cathode electron optical system with concurrently high beam current and high current density. The microscopic FE characteristics of the CNT film emitter is captured through the development of an empirically derived macroscopic simulation model which is used to provide representative emission performance. Through parametrically optimized macroscale simulations, a five-sheet-beam triode electron gun has been designed, and has been shown to emit up to 95 mA at 3.2 kV. Through careful engineering of the electron gun geometric parameters, a low-voltage compact THz radiation source operating in high-order TM 5 , 1 mode is investigated to improve output power and suppress mode competition. Particle in cell (PIC) simulations show the average output power is 33 W at 0.1 THz, and the beam–wave interaction efficiency is approximately 10%.

A truncated-cone carbon nanotube cold-cathode electron gun

Carbon ◽  
2017 ◽  
Vol 120 ◽  
pp. 374-379 ◽  
Author(s):  
Xuesong Yuan ◽  
Yu Zhang ◽  
Matthew T. Cole ◽  
Yang Yan ◽  
Xiaoyun Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electron Gun ◽  
Cold Cathode ◽  
Truncated Cone

scholarly journals Development of a High Resolution X-ray Microscope Equipped with a Carbon Nanotube Field Emission Cold Cathode

Hyomen Kagaku ◽  
2008 ◽  
Vol 29 (11) ◽  
pp. 682-687
Author(s):  
Koichi HATA ◽  
Ryosuke YABUSHITA ◽  
Tomoyuki OKADA
Keyword(s):  
Carbon Nanotube ◽  
High Resolution ◽  
Field Emission ◽  
Cold Cathode ◽  
X Ray

A Gridded High-Compression-Ratio Carbon Nanotube Cold Cathode Electron Gun

2015 ◽  
Vol 36 (4) ◽  
pp. 399-401 ◽  
Author(s):  
Xuesong Yuan ◽  
Yu Zhang ◽  
Huan Yang ◽  
Xiaoyun Li ◽  
Ningsheng Xu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Compression Ratio ◽  
Electron Gun ◽  
Cold Cathode ◽  
High Compression Ratio ◽  
High Compression
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