Electronic Beam Axial Velocity Measurement System

Abstract

The invention provides an electron beam axial velocity measurement system which comprises a capacitive probe device, a collector cavity structure, a voltage integral and transmission circuit, a voltage measurement device and a current measurement device. The capacitive probe device comprises a main cavity structure and an electron beam induction ring; the collector cavity structure is communicated with the main cavity structure and is in a shape of a spindle with a large middle and two small ends; the front end of the voltage integral and transmission circuit is electrically connected to the electron beam induction ring and used for converting inductive charge generated when electron beams penetrate through a capacitive probe into voltage signals; the voltage measurement device is electrically connected to the rear end of the a voltage integral and transmission circuit; the current measurement device is electrically connected to the collector cavity structure. By means of the electron beam axial velocity measurement system, influence of stray electrons during measurement is reduced, and measurement precision of electron beam axial velocity is increased.

Description

technical field [0001] The invention relates to the technical field of vacuum electronics, in particular to an electron beam axial velocity measurement system. Background technique [0002] Electrovacuum devices are a type of active electronic devices that use electron beams to interact with high-frequency electromagnetic fields to achieve microwave power amplification and conversion functions in vacuum or gaseous media. Nowadays, electric vacuum devices are widely used in the fields of radar, electronic countermeasures, guidance and satellite communication. With the development of electric vacuum device technology, various electronic injection measurement systems have emerged. Electron beam axial velocity is an important property of electron beam. [0003] figure 1 It is a structural schematic diagram of the measurement system in the electronic beam axial velocity measurement system in the prior art. Such as figure 1 As shown, the front end of the capacitive probe is c...

AI Technical Summary

Problems solved by technology

[0007] (1) The bombardment of the electron beam produces a large number of secondary electrons on the flat blind flange, which makes the measurement of the electron beam current inaccurate, and the secondary electron bombardment on the inner electrode of the capacitance probe will interfere with the induced voltage of the electron beam Measurement;

[0008] (2) When the electron beam with a large lateral velocity passes through the capacitance probe, part of the edge electrons diverge and hit the inner electrode of the probe, which makes the induced voltage of the electron beam transmitted by the inner electrode wrong, and even has the risk of destroying the inner electrode;

[0009] (3) Since the electronic injection induction ring and the insulating ceramic have a certain thickness, there is a large non-radial electric field at the front and rear edges of the induction ring, which increases the distortion of the voltage waveform measured on the electronic injection induction ring, making the detection The results and subsequent calculations all bring large errors;

[0010] (4) Since the lead wires of the electron injection induction loop are drawn separately from the rear edge, this aggravates the electric field distortion, and the lead wires are easily bombarded by stray electrons, which reduces the accuracy of probe detection

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