Relativistic electron beam-plasma interactions are not only key to unlocking the mysteries of the universe but also to developing transformative technologies in energy, healthcare, and scientific exploration. They play a crucial role in areas such as high-energy density physics, advanced radiation sources, inertial confinement fusion, and astrophysical simulations. These interactions enable efficient energy transfer and conversion over extremely short distances, enabling the fast ignition of fusion fuels, paving the way for next-generation miniature particle and radiation sources, and providing a laboratory platform for studying cosmic phenomena like solar flares and gamma bursts.
In this talk, I will introduce our recent research progresses on  relativistic electron beam(REB)-plasma interactions. First of all, the disordered media is introduced in beam-plasma physics for the first time. The fundamental interaction between high-current REB with disordered porous microstructures is systematically studied. Three novel and distinct transport regimes are discovered, and we define them as super-channeling, branching, and anomalous stopping, respectively. These regimes are now described in a unified phase diagram in the parameter space of beam density, beam energy, and pore size, defining the threshold where high-current effects dominate over collisional ones. Secondly, based on the REB plasma interaction process, we further extended the applications of REB in generating coherent radiation source and ultra-bright gamma-rays. We propose a new approach for producing coherent intense subcycle pulse by simply directing a REB into an underdense plasma with a density up-ramp. Three-dimensional nanoscale bunching of REB is also found in its self-driven plasma wakefield. Thirdly, recently striped filament structure in laser-driven proton acceleration is experimentally observed for the first time. We unlock the physical origin as the anisotropic REB interaction with solid-density plasmas.
These new findings open up new avenues for manipulating the focusing, transport, energy deposition, and radiation process of REB, and should be of much interest to researchers in broad ranging areas.

Relativistic Electron Beam，,porous microstrucures,,coherent radiation source,gamma-rays