Coherent synchrotron radiation monitor for microbunching instability in XFEL

Jun Ho Ko; Gyujin Kim; Changbum Kim; Heung-Sik Kang; In Soo Ko

doi:10.1063/1.5023848

Coherent synchrotron radiation monitor for microbunching instability in XFEL

Rev Sci Instrum. 2018 Jun;89(6):063302. doi: 10.1063/1.5023848.

Authors

Jun Ho Ko¹, Gyujin Kim², Changbum Kim², Heung-Sik Kang², In Soo Ko¹

Affiliations

¹ Department of Physics, POSTECH, Pohang 790-784, South Korea.
² Pohang Accelerator Laboratory, Pohang 790-834, South Korea.

PMID: 29960564
DOI: 10.1063/1.5023848

Abstract

The microbunching instability is an important issue in an X-ray Free Electron Laser (XFEL). The intensity of the Free Electron Laser (FEL) can be reduced significantly by the microbunching instability so that the laser heater is widely used to reduce it. In the X-ray Free Electron Laser of the Pohang Accelerator Laboratory (PAL-XFEL), to directly monitor the microbunching instability, a visible charge coupled device camera was included into the coherent radiation monitor which uses a pyroelectric detector. It enabled us to measure the microbunching instability more clearly and optimize the FEL lasing in the PAL-XFEL.