Dense γ-ray emission in two consecutive pulses irradiating near critical density plasma

Abstract We report the overdense electron acceleration and dense gamma ray emission via use of two continuous laser pulses irradiating near critical density plasma. Thanks to ion channel formed behind first pulse, leading beam is well focused a higher intensity. As result, noticeable re-injection focusing when one incident significantly suppressed in two-consecutive- lasers scheme, efficiently improved process. Moreover, owing stronger field energy, probability rate accelerated emitting γ -rays considerably enhanced. In this regime, intensity reduced from 1 × 10 23 $4\times 10^{22}$?> 4 22 W cm −2 with competitive generated rays.