The time-resolved spectral system for diagnosis of explosive emission cathode plasma

2016 ◽  
Author(s):  
Junping Tang ◽  
Weibo Yao ◽  
Yongmin Zhang ◽  
Jianming Guo ◽  
Tian Yang
Keyword(s):  
Cathode Plasma ◽  
Explosive Emission ◽  
Time Resolved ◽  
Spectral System ◽  
Explosive Emission Cathode ◽  
Emission Cathode

scholarly journals Влияние анодной и катодной плазмы на работу электронного диода со взрывоэмиссионным катодом

2022 ◽  
Vol 92 (2) ◽  
pp. 232
Author(s):  
А.И. Пушкарев ◽  
С.С. Полисадов
Keyword(s):  
Electron Beam ◽  
High Efficiency ◽  
Plasma Layer ◽  
Total Charge ◽  
Cathode Plasma ◽  
Explosive Emission ◽  
Gas Plasma ◽  
Explosive Emission Cathode ◽  
Developed Surface ◽  
Emission Cathode

The results of modeling and experimental investigation of the formation of anode and cathode plasmas in a vacuum diode with an explosive-emission cathode during the generation of a pulsed electron beam with a current density of 0.3-0.4 kA/cm^2 and an accelerating voltage of 300-500 kV are presented. It is shown that the concentration of the anode plasma does not exceed 10^10 cm^-3 and it does not significantly contribute to the operation of the diode. However, the complete desorption of molecules from the working surface of the explosive-emission cathode and the high efficiency of shock ionization of atoms ensure the formation of a cathode gas plasma with a concentration of 10^16 cm^-3. It is found that the charge of the explosive-emission plasma layer is significantly less than the charge of the electron beam and the main source of electrons is not an explosive-emission plasma, but a cathode gas plasma. In this case, the electron current is limited by the concentration of the cathode plasma. The use of a cathode with a developed surface (a cathode with a carbon fabric coating) allows increasing the total charge of the electron beam by more than 1.5 times without changing the cathode diameter and the anode-cathode gap.

Activation of the explosive-emission cathode under various conditions of preinitiation

Vacuum ◽  
2017 ◽  
Vol 143 ◽  
pp. 473-478 ◽  
Author(s):  
S.A. Shunailov ◽  
M.I. Yalandin ◽  
K.A. Sharypov ◽  
M.D. Kolomiets ◽  
M.R. Ulmasculov ◽  
...  
Keyword(s):  
Explosive Emission ◽  
Explosive Emission Cathode ◽  
Emission Cathode

Research on an improved explosive emission cathode

2009 ◽  
Vol 42 (12) ◽  
pp. 125204 ◽  
Author(s):  
Guozhi Liu ◽  
Jun Sun ◽  
Hao Shao ◽  
Changhua Chen ◽  
Xiaowei Zhang
Keyword(s):  
Explosive Emission ◽  
Explosive Emission Cathode ◽  
Emission Cathode

scholarly journals Influence of Cathode Diameter on the Operation of a Planar Diode with an Explosive Emission Cathode

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Yulia I. Isakova ◽  
Galina E. Kholodnaya ◽  
Alexander I. Pushkarev
Keyword(s):  
Experimental Investigations ◽  
Electron Current ◽  
Explosive Emission ◽  
Total Electron ◽  
Planar Diode ◽  
Graphite Cathode ◽  
Nanosecond Pulses ◽  
Ion Accelerator ◽  
Explosive Emission Cathode ◽  
Emission Cathode

This paper presents the results of experimental investigations into the current-voltage characteristics of a planar diode with an explosive emission cathode made from graphite. Studies were performed using a TEU-500 pulsed electron accelerator (350–500 keV, 100 ns, 250 J per pulse). Duration of diode operation, in a mode when electron current is limited by the emissive ability of the graphite cathode, is 15–20 ns. The contribution of the cathode periphery to total electron current appears only as an increase in the emissive surface area due to an expansion of explosive plasma. Investigations of an ion diode with a graphite cathode (plane and focusing geometry) were also carried out. Experiments were performed using a TEMP-4M ion accelerator, which forms two nanosecond pulses: the first negative pulse (150–200 kV, 300–600 ns) followed by the second positive (250–300 kV, 150 ns). Total diode current in the first pulse is well described by the Child-Langmuir law for electron current at a constant rate of plasma expansion, equal to 1.3 cm/μs. It is shown that for an area of flat cathode over 25 cm2, the influence of edge contribution does not exceed measurement error of total diode electron current (10%).

Sign in / Sign up

Export Citation Format

Share Document