Search

This article presents a study for a 250 GHz MW-level continuous mode gyrotron to satisfy the demand of DEMO for over 200 GHz high-power microwave sources. Through careful analysis, the new high-order mode TE45,18 is chosen as the operation mode. Simultaneously, the magnetic injection electron gun is researched to meet the operation requirement of the gyrotron. A novel curved gradient structure is proposed instead of the traditional linear folding structure for obtaining high-quality electronic beams. Through the linear theory and the time-dependent multimode self-consistent nonlinear theory of gyrotron, the detailed study of mode competition is conducted in the resonator cavity. The TE45,18 mode can maintain operational stability while suppressing other competition modes at the magnetic field of 9.9600 T, the operation voltage of 80 kV, and the beam current of 35 A. When considering the ideal electron beam, the output power is 1070 kW and the operation efficiency is 38.21%. The output power and operation efficiency are reduced to 1041 kW, and 37.17%, respectively, when considering the realistic electron beam from the magnetic injection gun (MIG) electron gun.

The radar network employs multisource data-level fusion to discriminate and suppress deceptive false target interference based on the “spatial colocation” differences between genuine and false targets, which severely threaten actual targets. We propose a multisource collaborative spatial decoy target deception method to enhance the jamming and counteraction capabilities of jammers against the radar network. This method utilizes prior information about the quantity and positions of our jamming devices and the enemy radar network. It constructs a multisource collaborative spatial decoy target deception model and employs optimization to determine the jammer positions, decoy target locations, and jamming parameters. Each jammer adjusts its transmission delays and modulates the jamming signal phase and amplitude to achieve highly flexible, real-time, spatially colocated deception in the spatial, temporal, and Doppler domains. Multiple jammers collaborate to create realistic, positively correlated tracks within the radar network, effectively providing cover for our target's penetration. Formula derivations and simulation experiments confirm the effectiveness of this multisource collaborative spatial decoy target deception, significantly enhancing the disruption capabilities of airborne clusters against the radar network.