Outgassing property of carbon nanotube cathode with intense pulsed emission

Experimental investigations on the vacuum outgassing of a carbon nanotube (CNT) cathode with high-intensity pulsed electron emission on a 2 MeV linear induction accelerator injector are presented. Under the 1.60 MV diode voltage, the CNT cathode could provide 1.67 kA electron beam with the amount of outgassing of about 0.51 Pa•L. It is found that the amount of outgassing, which determines the cathode emission current, depends on the diode voltage and the vacuum.

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“…A measurement method of the outgassing is introduced in our previous study [15,16] . The IVG is used to monitor pressure of the vacuum chamber.…”

Section: Measurement Of the Outgassingmentioning

confidence: 99%

“…Effects of vacuum on cathode emission current and outgassing: p is the vacuum pressure, and jCL is the space-charge limited current density p (×10 −4 Pa) U d (MV) I k (kA) jCL (A/cm 2 ) je (A/cm 2 ) Ne (×1014 ) ∆Q (Pa•L) Na (×1016 ) η (atoms/e − )…”

mentioning

confidence: 99%

Vacuum Outgassing Behavior of Carbon Nanotube Cathode with High-Intensity Pulsed Electron Emission

Shen

Zhang²,

Xia³

et al. 2015

Plasma Sci. Technol.

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“…Cathodes with ideal shot-to-shot stability, low outgassing and long lifetime have been one of the main pursuits in high power microwave (HPM) field, [1][2][3] especially in the repetitive operation HPM systems. [4][5][6] In order to obtain ideal cathodes, researchers have done lots of work to study various cathodes made from different materials, [7][8][9][10][11] among which carbon fiber and velvet are two kinds of the most popular materials.…”

Section: Introductionmentioning

confidence: 99%

A low-outgassing-rate carbon fiber array cathode

Fan

Qian

et al. 2018

Chinese Phys. B

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In this paper, a new carbon fiber based cathode -a low-outgassing-rate carbon fiber array cathode -is investigated experimentally, and the experimental results are compared with those of a polymer velvet cathode. The carbon fiber array cathode is constructed by inserting bunches of carbon fibers into the cylindrical surface of the cathode. In experiment, the diode base pressure is maintained at 1×10 −2 Pa-2×10 −2 Pa, and the diode is driven by a compact pulsed power system which can provide a diode voltage of about 100 kV and pulse duration of about 30 ns at a repetition rate of tens of Hz. Real-time pressure data are measured by a magnetron gauge. Under the similar conditions, the experimental results show that the outgassing rate of the carbon fiber array cathode is an order smaller than that of the velvet cathode and that this carbon fiber array cathode has better shot-to-shot stability than the velvet cathode. Hence, this carbon fiber array cathode is demonstrated to be a promising cathode for the radial diode, which can be used in magnetically insulated transmission line oscillator (MILO) and relativistic magnetron (RM).

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Study of pulsed field emission characteristics and simulation models of carbon nanotube cold cathodes

Yuan¹,

Zhang²,

Sun³

et al. 2012

Acta Phys. Sin.

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For the application requirement of a carbon nanotube clod cathode (CNCC) used in the microwave and millimeter wave electric vacuum radiation source devices, pulsed field emission characteristics of CNCC are experimentally investigated by a 2 μs/20 kV high-voltage modulator in this paper. The pulsed field emission currents for different distances between anode and cathode and those of CNCC after the pulsed high-tension arc has occurred many times are studied. A maximal emission current of 16 mA is tested for CNCC with a 4 mm diameter emission disk, and the emission current density is achieved to be 127 mA/cm2. Based on the experimental results, the field emission simulation model of CNCC is established by PIC simulation software. Simulation results show that this simulation model is suited for describing the experimental results and laying the foundation for the development of CNCC electron optical system and radiation source devices.

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Outgassing property of carbon nanotube cathode with intense pulsed emission

Cited by 3 publications

References 14 publications

Vacuum Outgassing Behavior of Carbon Nanotube Cathode with High-Intensity Pulsed Electron Emission

Vacuum Outgassing Behavior of Carbon Nanotube Cathode with High-Intensity Pulsed Electron Emission

A low-outgassing-rate carbon fiber array cathode

Study of pulsed field emission characteristics and simulation models of carbon nanotube cold cathodes

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