The electron-optical system with magnetic focusing based on sheet carbon nanotube field emitters for twt at terahertz frequencies
Н. А. БушуевА. А. БурцевYu. A. GrigorievAlexander A. PavlovN.I. SinitsynAleksei V. DanilushkinВ. И. РоговинK. V. Shumikhin
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This report presents the results of calculation of electron-optical system consisting of a sheet CNT field emission cathode with a microgrid spaced from the surface of the emitter at 100 microns. On the basis of experimental data, it has been designed electron-optical system with a sheet CNT cathode with linear convergence of 6,25, and with the beam current density of 4,46 A/cm 2 . The thickness of the beam in the interaction space is 0,16 mm. In this case, the simulation of the sheet electron beam, generated by electron gun has shown feasibility of obtaining of low-perveance flow with a small deformation in beam tunnel 0,3×0,8 at 25 mm slow-wave system length.Keywords:
Electron gun
Perveance
Electron optics
In this work a complete design of an electron gun with a cold cathode is described. The electron gun has been designed in order to be used in THz vacuum amplifiers or oscillators. The electron gun delivers a circular electron beam with a radius of 25 μm and current of about 1.4 mA. The electron gun operates at beam voltage of 10 kV and perveance of 0,0014 μP.
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Perveance
Cold cathode
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Perveance
Electron gun
Position (finance)
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This paper introduces the detailed design scheme of a multi-beam electron gun applied to an S-band high power multi-beam klystron. The multi-beam gun adopts a coaxial cavity arrangement, and the total number of electron beams are 40 (19 in the inner layer and 21 in the outer layer). The working voltage of the electron gun is 60 kV, the total current is 300 A (evenly distributed on 40 electron beams), and the single beam perveance is 0.51 μP. The total perveance is 20.4 μP. The cathode loading of the gun is 12 A/cm2, which can meet the requirements of cathode operational lifetime. The beam focusing system uses a periodic reversal permanent magnet to realize miniaturization of the klystron.
Perveance
Klystron
Electron gun
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Long life high performance grid-controlled electron gun has been great extensive used in multi-beam klystron. High performance grid-controlled electron gun is the base of modern high power and broadband multi-beam klystron. We developed a tight and efficient electron gun; its perveance can be more than 0.5 micro-perveance of only one cathode.The whole electron gun has 28 independent small cathodes. The total of whole gun's perveance can be more than 18 micro-perveance. The characteristics of the gun are given in this article.
Perveance
Electron gun
Klystron
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The EGUN code is used to model a 0,7 ¿Perv electron gun with control and shadow grids under space-charge limited flow. The model parameters will be used to implement a pulsed traveling-wave tube (TWT). The simulation main goal is to obtain an electron gun to yield a 2.0 mm beam-waist with a 6.5 compression ratio. This work presents the sensitivity analysis for the following input geometric quantities: the cathode radius disc; the electrode focus angle; the cathode-to-anode distance; the grid-to-cathode distance; and the grid voltage. It was observed a decreasing of the gun perveance and the current when the grid voltage was turned on if it compared to the gun design without grids. The results also show that a shadow-grid physically modeled that led to a gun with lower current/perveance. Moreover, a 3-dimensional (3D) viewer of the EGUN output current density data is implemented. Last, a final assembling stage electron gun experimental setup is presented.
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Electron gun
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A low perveance (0.22 muP) electron gun for Ku-band 140W space traveling wave tube (TWT) has been designed, using E-GUN and TRAK codes. Pierce type electron gun with an electrically isolated beam forming electrode (BFE) and an ion barrier anode (A 0 ) has been opted. An M-type dispenser cathode with low cathode
Perveance
Electron gun
Traveling-wave tube
Klystron
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The manufacture method and development of the field emitter array (FEA) are presented in this paper.The possibility of the field emitter arrays as the electron sources in traveling wave tubes is discussed.The electron gun design with FEAs is also introduced.
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Field emitter array
Traveling-wave tube
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A ferroelectric electron gun was designed and fabricated.The simulation and preliminary experimental results of the gun are reported.The gun uses a planar Ba0.67Sr0.33TiO3(BST67/33)cathode in a Pierce geometry.The gun voltage can reach 80 kV with the pulse width of 80 ns.The designed perveance of the gun is 0.15×10-6 A·V-3/2.In the experiment,the gun voltage gradually increases from 30 kV to 56 kV,and the emission current increases from 0.7 A to 2.5 A.The perveance of the gun is measured as 0.2×10-6 A·V-3/2,mearly the same as the designed value.
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Electron gun
Rifle
Gun control
Acceleration voltage
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A Pierce electron gun for travelling wave tube has been proposed. Based on the electrostatic Particle-In-Cell (PIC) method, the mirror structure parameters of the Pierce electron gun were simulated and optimized through the FORTRAN program developed by us. After that, the electron beam current and perveance of the designed electron gun can be reached to 373 mA and 0.28 μA/V 3/2 , respectively, when the electric potential of the cathode and the focusing electrode is zero, and that of the anode is 12 kV.
Perveance
Electron gun
Traveling-wave tube
Fortran
Klystron
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With the synthesis of Pierce's electron gun and the concepts of the cylindrical focusing electrode and the dual anode's setting,the electron gun,which may produce a high current electron beam with high current density and high perveance for S-band high power helix TWT,is designed by theory analyzing and the Egun software computing,and this electron gun is machined and mounted in TWT successfully.
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Electron gun
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