中文摘要：

基于使回响能的上演泛音产生(EESHG ) 生产协调难 X 光检查的一条新奇途径免费电子的激光计划被建议。这个计划不是简单串联使回响能的泛音代(EEHG ) ，但是由象配置一样的 EEHG 和常规高获得的泛音代(HGHG ) 组成，它也在 EEHG 原则工作。充分协调的难 X 光检查放射能与减少的尺寸从常规 VUV 种子激光直接被获得，与自我放大的自发的排放(SASE ) 比较的费用基于难 X 光检查设备，这被显示出。

英文摘要：

A novel approach to producing coherent hard X-ray based on the echo-enabled staged harmonic generation （EESHG） free-electron laser scheme is proposed. This scheme is not a simple cascaded echo-enabled harmonic generation （EEHG） but consists of an EEHG and a conventional high-gain harmonic generation （HGHG） like configuration, which also works in the EEHG principle. It is shown that fully coherent hard X-ray radiation can be obtained directly from a conventional VUV seed laser with reduced size and cost in comparison with the self-amplified spontaneous emission （SASE） based hard X-ray facilities.