scholarly journals Two-stage reflective self-seeding scheme for high-repetition-rate X-ray free-electron lasers

2021 ◽  
Vol 28 (1) ◽  
pp. 44-51
Author(s):  
Guanqun Zhou ◽  
Zhengxian Qu ◽  
Yanbao Ma ◽  
William J. Corbett ◽  
Yi Jiao ◽  
...  
Keyword(s):  
Free Electron ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Three Dimension ◽  
Free Electron Lasers ◽  
New Era ◽  
X Ray ◽  
High Repetition ◽  
Narrow Bandwidth ◽  
New Generation

X-ray free-electron lasers (XFELs) open a new era of X-ray based research by generating extremely intense X-ray flashes. To further improve the spectrum brightness, a self-seeding FEL scheme has been developed and demonstrated experimentally. As the next step, new-generation FELs with high repetition rates are being designed, built and commissioned around the world. A high repetition rate would significantly speed up the scientific research; however, alongside this improvement comes new challenges surrounding thermal management of the self-seeding monochromator. In this paper, a new configuration for self-seeding FELs is proposed, operated under a high repetition rate which can strongly suppress the thermal effects on the monochromator and provides a narrow-bandwidth FEL pulse. Three-dimension time-dependent simulations have been performed to demonstrate this idea. With this proposed configuration, high-repetition-rate XFEL facilities are able to generate narrow-bandwidth X-ray pulses without obvious thermal concern on the monochromators.

scholarly journals Transient thermal stress wave and vibrational analyses of a thin diamond crystal for X-ray free-electron lasers under high-repetition-rate operation

2018 ◽  
Vol 25 (1) ◽  
pp. 166-176 ◽  
Author(s):  
Bo Yang ◽  
Songwei Wang ◽  
Juhao Wu
Keyword(s):  
Thermal Stress ◽  
Stress Wave ◽  
Free Electron ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Free Electron Lasers ◽  
X Ray ◽  
High Repetition ◽  
Transient Thermal Stress ◽  
Transient Thermal

High-brightness X-ray free-electron lasers (FELs) are perceived as fourth-generation light sources providing unprecedented capabilities for frontier scientific researches in many fields. Thin crystals are important to generate coherent seeds in the self-seeding configuration, provide precise spectral measurements, and split X-ray FEL pulses,etc. In all of these applications a high-intensity X-ray FEL pulse impinges on the thin crystal and deposits a certain amount of heat load, potentially impairing the performance. In the present paper, transient thermal stress wave and vibrational analyses as well as transient thermal analysis are carried out to address the thermomechanical issues for thin diamond crystals, especially under high-repetition-rate operation of an X-ray FEL. The material properties at elevated temperatures are considered. It is shown that, for a typical FEL pulse depositing tens of microjoules energy over a spot of tens of micrometers in radius, the stress wave emission is completed on the tens of nanoseconds scale. The amount of kinetic energy converted from a FEL pulse can reach up to ∼10 nJ depending on the layer thickness. Natural frequencies of a diamond plate are also computed. The potential vibrational amplitude is estimated as a function of frequency. Due to the decreasing heat conductivity with increasing temperature, a runaway temperature rise is predicted for high repetition rates where the temperature rises abruptly after ratcheting up to a point of trivial heat damping rate relative to heat deposition rate.

scholarly journals High Repetition Rate and Coherent Free-Electron Laser in the X-Rays Range Tailored for Linear Spectroscopy

Instruments ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 47 ◽  
Author(s):  
Vittoria Petrillo ◽  
Michele Opromolla ◽  
Alberto Bacci ◽  
Illya Drebot ◽  
Giacomo Ghiringhelli ◽  
...  
Keyword(s):  
Free Electron ◽  
Repetition Rate ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Repetition Rate ◽  
X Rays ◽  
Regenerative Amplifier ◽  
X Ray ◽  
High Repetition

Fine time-resolved analysis of matter—i.e., spectroscopy and photon scattering—in the linear response regime requires fs-scale pulsed, high repetition rate, fully coherent X-ray sources. A seeded Free Electron Laser (FEL) driven by a Linac based on Super Conducting cavities, generating 10 8 – 10 10 coherent photons at 2–5 keV with 0.2–1 MHz of repetition rate, can address this need. Three different seeding schemes, reaching the X-ray range, are described hereafter. The first two are multi-stage cascades upshifting the radiation frequency by a factor of 10–30 starting from a seed represented by a coherent flash of extreme ultraviolet light. This radiation can be provided either by the High Harmonic Generation of an optical laser or by an FEL Oscillator operating at 12–14 nm. The third scheme is a regenerative amplifier working with X-ray mirrors. The whole chain of the X-ray generation is here described by means of start-to-end simulations.

scholarly journals X-ray spectrometer based on a bent diamond crystal for high repetition rate free-electron laser applications

2017 ◽  
Vol 25 (3) ◽  
pp. 2852 ◽  
Author(s):  
Ulrike Boesenberg ◽  
Liubov Samoylova ◽  
Thomas Roth ◽  
Diling Zhu ◽  
Sergey Terentyev ◽  
...  
Keyword(s):  
Free Electron ◽  
Repetition Rate ◽  
Free Electron Laser ◽  
Diamond Crystal ◽  
High Repetition Rate ◽  
Laser Applications ◽  
X Ray ◽  
High Repetition

scholarly journals High average power 88  W OPCPA system for high-repetition-rate experiments at the LCLS x-ray free-electron laser

2019 ◽  
Vol 44 (5) ◽  
pp. 1257 ◽  
Author(s):  
Katalin Mecseki ◽  
Matthew K. R. Windeler ◽  
Alan Miahnahri ◽  
Joseph S. Robinson ◽  
James M. Fraser ◽  
...  
Keyword(s):  
Free Electron ◽  
Repetition Rate ◽  
Free Electron Laser ◽  
Average Power ◽  
High Repetition Rate ◽  
High Average Power ◽  
X Ray ◽  
High Repetition
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