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A new scheme for bright hard x-ray emission from laser wakefield electronaccelerator is reported, where pure nitrogen gas is adopted. Intense Betatronx-ray beams are generated from ionization injected K-shell electrons ofnitrogen into the accelerating wave bucket. The x-ray radiation showssynchrotron-like spectrum with total photon yield 8$\times$10$^8$/shot and$10^8$ over 110keV. In particular, the betatron hard x-ray photon yield is 10times higher compared to the case of helium gas under the same laserparameters. Particle-in-cell simulation suggests that the enhancement of thex-ray yield results from ionization injection, which enables the electrons tobe quickly accelerated to the driving laser region for subsequent betatronresonance. Employing the present scheme,the single stage nitrogen gas targetcould be used to generate stable high brightness betatron hard x-ray beams.

Resonantly excited betatron hard X-Rays from Ionization Injected Electron Beam in a Laser Plasma Accelerator