학술논문
SLAC Femtosecond Laser Timing Synchronization System
Document Type
Conference
Author
Source
2022 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2022 IEEE. :1-3 Nov, 2022
Subject
Language
ISSN
2577-0829
Abstract
SLAC femtosecond laser timing synchronization system is an FPGA based real time feedback control system that synchronizes laser oscillator to RF reference signal on femtosecond timing scale. The system was first installed on SLAC mega-electron-volt (MeV) ultrafast electron diffraction (UED) instrument in 2019 and has achieved 10 femtosecond laser-RF timing jitter on the UED laser oscillator. Since then, the system has been installed in a few other SLAC laser facilities, such as the LCLS (Linac Coherent Light Source) - II injector laser, LCLS-II pump-probe lasers, etc. These lasers have different tuning ranges from a few Hz per volt to a few hundred Hz per volt and tuning bandwidth from a few kHz to hundreds kHz. We have recently upgraded the firmware design to enable a wider operating range so that the system can be used on various SLAC lasers with different tuning parameters. This presentation describes the system algorithm, its FPGA implementation and test results from various lasers.