Enhancement of laser-driven betatron x-rays by a density-depressed plasma structure

B. Guo, Z. Cheng, S. Liu, X. N. Ning, J. Zhang, C. H. Pai, J. F. Hua, H. H. Chu, J. Wang, W. Lu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We report a significant enhancement of betatron radiation from a laser wakefield accelerator (LWFA) by inserting a density-depressed plasma structure. By using a technique of transverse laser machining, a longitudinally density-depressed plasma structure with tunable length and position has been fabricated to increase the betatron amplitude of the electron beam in the LWFA, leading to an enhanced photon number and critical energy of the betatron x-ray beam. By adjusting the length and position of the plasma density depression region, the photon number of the betatron x-ray is enhanced by a factor of 3, and the critical energy is enhanced by a factor of 1.4.

Original languageEnglish
Article number035003
JournalPlasma Physics and Controlled Fusion
Issue number3
StatePublished - 10 Jan 2019


  • betatron radiation
  • laser plasma accelerator
  • particle-in-cell simulations
  • plasma machining


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