摘要
We report the development of a stable high-average power X-ray source generated by the interaction of ultrashort laser pulses(35 fs,1 mJ,1 kHz)with a solid target in air.The achieved source stability,which is essential for the applications foreseen for these laser-driven plasma accelerators,is due to the combination of precise positioning of the target on focus and the development of a fast rotating target system able to ensure the refreshment of the material at every shot while minimizing positioning errors with respect to the focal spot.This vacuum-free laser-plasma X-ray source provides an average dose rate of 1.5 Sv/h at 30 cm and a repeatability better than 93%during more than 36 min of continuous operation per target.
基金
supported by the Spanish Ministerio de Ciencia, Innovación y Universidades under RTI2018-101578-BC21 and FPI predoctoral BES-2017-08917 grants
Unidad de Excelencia Maria de Maeztu under project MdM-20160692-17-2
the Xunta de Galicia research grant GRCED431C 2017/54.
