Three-axis relativistic klystron amplifier capable of suppressing non-rotational symmetric clutter mode

Abstract

The invention belongs to the technical field of high-power microwaves, and discloses a three-axis relativistic klystron amplifier capable of suppressing a non-rotational symmetric clutter mode. The amplifier comprises a cathode seat 201, a cathode 202, an anode outer cylinder 203, an inner conductor 204, an injection cavity 205, a first reflection cavity 206, a first clustering cavity 207, a second reflection cavity 208, a second clustering cavity 209, a third reflection cavity 210, an extraction cavity 211, a conical waveguide 212, a feedback ring 213, an electron beam collector 214, a support rod 215, a microwave output port 216, a solenoid magnetic field 217 and an injection waveguide 218. The whole structure is in rotational symmetry relative to the central axis. Through the reasonabledesign of an electromagnetic structure of the amplifier, the defects that a lateral dual-port injection structure in an existing three-axis relativistic klystron amplifier is complex, non-rotationalsymmetric mode self-excited oscillation is difficult to completely inhibit from a physical mechanism and the like are overcome, and the three-axis relativistic klystron amplifier has good frequency-locking and phase-locking characteristics; the amplifier has important reference significance for designing a similar klystron amplifier required by high-power microwave space coherent power synthesis.

Description

technical field [0001] The invention relates to a microwave source device in the field of high-power microwave technology, in particular to a triaxial relativistic klystron amplifier (TRKA) capable of suppressing non-rotationally symmetric miscellaneous modes. Background technique [0002] High Power Microwave (HPM) usually refers to electromagnetic waves with a peak power greater than 100 MW and a frequency between 1 and 300 GHz. The high-power microwave source is the core component of the high-power microwave system. It converts the energy of the strong-current relativistic electron beam into microwave energy through the special electromagnetic structure inside the device, and then generates directional high-power microwave radiation through the transmitting antenna. The pursuit of high output microwave power is the main development direction in the field of high-power microwave technology. However, with the increase of output microwave power, the RF field strength in the ...

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Problems solved by technology

This technical scheme verifies the feasibility of the three-axis relativistic klystron amplifier to achieve GW-level phase-locked high-power microwave output in the high frequency band, which has important reference significance for the design of high-gain relativistic klystron amplifier, but the technical scheme has the following Disadvantages: (1) A single three-gap cluster cavity has limited ability to modulate the high-current electron beam, and the modulation depth of the electron beam is only 102%, so the extraction cavity cannot efficiently convert the energy of the electron beam into microwave energy, resulting in the The efficiency is relatively low; (2) In order to improve the modulation depth of the electron beam, the power required for injecting microwave signals is relatively high, resulting in a relatively low gain of the device; (3) The injection cavity adopts a dual-port microwave injection structure, which is prone to two The amplitude and phase of the injected microwaves at the port are inconsistent, which affects the angular uniformity of the electric field in the cavity gap and excites non-rotationally symmetrical heterogeneous modes; (4) The output microwave pulse width of the device is only 105 ns, mainly because the structure adopts the same Axial mode reflectors are used to suppress the self-excited oscillations of non-rotationally symmetric TE modes, while mode reflectors can only achieve high-efficiency suppression of a few non-rotationally symmetric TE modes; in experiments, non-rotationally symmetric The TE mode gradually starts to oscillate, which eventually makes it difficult to increase the output microwave pulse width of the device; therefore, in order to further increase the output microwave pulse width of TRKA, the TE mode must be realized from the source, that is, from the onset mechanism of the non-rotationally symmetric TE mode. Suppression of excited oscillations

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