P4-1: Electron gun with cold cathode for THz devices
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Abstract:
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.Keywords:
Electron gun
Perveance
Cold cathode
In this work, a Spindt cold cathode electron gun with a PPM (periodic permanent magnet) focusing system for a terahertz TWT (traveling wave tube) was designed and simulated based on the Pierce electron gun structure. More specifically, a new 3D (three dimensional) emission model was used, where the cathode radius of the electron gun was 1 mm and the cathode current was 30 mA, with an emitting half angle of about 28°. It was demonstrated that the electron beam was well focused with an electron beam radius of 0.3 mm and a filling ratio of 0.5 when the maximum value of the PPM field along with the axis was 0.122T. According to the simulation results, a planar cold cathode electron gun was developed. Measurements demonstrated that the I/V characteristics of the cold cathode gun were consistent with that of a cold cathode, revealing that the electrons emitted from the cathode are not intercepted when passing through the electron gun.
Electron gun
Cold cathode
Traveling-wave tube
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Perveance
Electron gun
Position (finance)
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An electron gun based on a carbon nanotube cold cathode is investigated. The experiment results show that when the inner and outer radius of cathode are 4.5mm and 6.5mm, a 4mA/10kV annular electron beam can be obtained. The area compression ratio of the electron beam is 10.
Electron gun
Cold cathode
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In order to develop miniaturized and integrated electron vacuum devices, the multi-beam modulation in a carbon nanotube (CNT) cold cathode electron gun is investigated. Steady field-emission electron beams are modulated in an electron gun by feeding a high-frequency field between the cathodes and the anode. Simulation results of multi-beam electron gun show that phase modulation of beam can be controlled by changing the distance between different CNT cold cathodes.
Electron gun
Cold cathode
Modulation (music)
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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.
Perveance
Electron gun
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Electron gun
Cold cathode
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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.
Perveance
Electron gun
Rifle
Gun control
Acceleration voltage
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Based on the field emission test results of the single wall carbon nanotubes (SWCNTs) cold cathode, a cold cathode electron gun for terahertz (THz) traveling wave tube (TWT) was studied. The simulation results showed that the radius of the electron beam could be well confined within 0.05 mm when the peak value of the axial magnetic field (Br) of the periodic permanent magnet (PPM) focusing system was set as 0.8 Tesla (T). The beam waist radius was about 0.014mm, and the area compression ratio was 13. The designed cold cathode electron gun could be used in some miniaturized THz TWTs.
Electron gun
Traveling-wave tube
Cold cathode
Hot cathode
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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.
Perveance
Electron gun
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