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Bright and ultrashort duration X-ray pulses can be produced by throughbetatron oscillations of electrons during Laser Wakefield Acceleration (LWFA).Our experimental measurements using the \textsc{Hercules} laser systemdemonstrate a dramatic increase in X-ray flux for interaction distances beyondthe depletion/dephasing lengths, where the initial electron bunch injected intothe first wake bucket catches up with the laser pulse front and the laser pulsedepletes. A transition from an LWFA regime to a beam-driven plasma wakefieldacceleration (PWFA) regime consequently occurs. The drive electron bunch issusceptible to the electron-hose instability and rapidly develops largeamplitude oscillations in its tail, which leads to greatly enhanced X-rayradiation emission. We measure the X-ray flux as a function of accelerationlength using a variable length gas cell. 3D particle-in-cell (PIC) simulationsusing a Monte Carlo synchrotron X-ray emission algorithm elucidate thetime-dependent variations in the radiation emission processes.

High Flux Femtosecond X-ray Emission from the Electron-Hose Instability in Laser Wakefield Accelerators