Generating Single-Spike Hard X-Ray Pulses with Nonlinear Bunch Compression in Free-Electron Lasers

S Huang; Y Ding; Y Feng; E Hemsing; Z Huang; J Krzywinski; A A Lutman; A Marinelli; T J Maxwell; D Zhu

doi:10.1103/PhysRevLett.119.154801

Generating Single-Spike Hard X-Ray Pulses with Nonlinear Bunch Compression in Free-Electron Lasers

Phys Rev Lett. 2017 Oct 13;119(15):154801. doi: 10.1103/PhysRevLett.119.154801. Epub 2017 Oct 10.

Authors

S Huang¹, Y Ding², Y Feng², E Hemsing², Z Huang², J Krzywinski², A A Lutman², A Marinelli², T J Maxwell², D Zhu²

Affiliations

¹ Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China.
² SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.

PMID: 29077438
DOI: 10.1103/PhysRevLett.119.154801

Abstract

A simple method for generating single-spike hard x-ray pulses in free-electron lasers (FELs) has been developed at the Linac Coherent Light Source (LCLS). This is realized by nonlinear bunch compression using 20-pC bunch charge, demonstrated in the hard x-ray regime at 5.6 and 9 keV, respectively. Measurements show about half of the FEL shots containing a single-spike spectrum. At 5.6-keV photon energy, the single-spike shots have a mean pulse energy of about 10 μJ with 70% intensity fluctuation and the pulse full width at half maximum is evaluated to be at 200-as level.