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We present a new workflow for imaging damped three‐dimensional elastic wavefields in the Fourier domain. The workflow employs a multiscale imaging approach, in which offset lengths are laddered, where frequency content and damping of the data are changed cyclically. Thus, the inversion process is launched using short‐offset and low‐frequency data to recover the long spatial wavelength of the image...
Theoretical and numerical considerations have shown that a planar FEM with 2-D distributed feedback is suitable to be used as a module for constructing multichannel devices to produce microwave radiation of GW level. Computer simulations for operation of 4-modules FEM-generator have demonstrated a perfect synchronization of all modules even at a little bit different energies of the electron beams...
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