Progress in Transient Collisional Excitation X-ray Lasers

For the advantages of low driven energy, high efficiency and easy downsizing, transient collisional excitation X-ray lasers propel the development of the X-ray lasers rapidly. The breakthroughs in transient collisional excitation X-ray lasers are summarized in detail, and the important factors of developing experiments in transient collisional excitation x-ray lasers are also discussed