skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Hard X-ray self-seeding commissioning at PAL-XFEL

Journal Article · · Journal of Synchrotron Radiation (Online)
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1] more »;  [1];  [1];  [2];  [2];  [2];  [3];  [3];  [1] « less
  1. Pohang Accelerator Lab., Gyeongbuk (Republic of Korea)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Technological Institute for Superhard and Novel Carbon Materials, Moscow (Russian Federation)
+ Show Author Affiliations

A wake monochromator based on a large-area diamond single crystal for hard X-ray self-seeding has been successfully installed and commissioned in the hard X-ray free-electron laser (FEL) at the Pohang Accelerator Laboratory with international collaboration. For this commissioning, the self-seeding was demonstrated with a low bunch charge (40 pC) and the nominal bunch charge (180 pC) of self-amplified spontaneous emission (SASE) operation. The FEL pulse lengths were estimated as 7 fs and 29.5 fs, respectively. In both cases, the average spectral brightness increased by more than three times compared with the SASE mode. The self-seeding experiment was demonstrated for the first time using a crystal with a thickness of 30 µm, and a narrow bandwidth of 0.22 eV (full width at half-maximum) was obtained at 8.3 keV, which confirmed the functionality of a crystal with such a small thickness. In the nominal bunch-charge self-seeding experiment, the histogram of the intensity integrated over a 1 eV bandwidth showed a well defined Gaussian profile, which is evidence of the saturated FEL and a minimal electron-energy jitter (~1.2 × 10–4) effect. Here, the corresponding low photon-energy jitter (~2.4 × 10–4) of the SASE FEL pulse, which is two times lower than the Pierce parameter, enabled the seeding power to be maximized by maintaining the spectral overlap between SASE FEL gain and the monochromator.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1576740
Journal Information:
Journal of Synchrotron Radiation (Online), Vol. 26, Issue 4; ISSN 1600-5775
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (15)

Demonstration of self-seeding in a hard-X-ray free-electron laser journal August 2012
Femtosecond X-Ray Pulse Characterization in Free-Electron Lasers Using a Cross-Correlation Technique journal December 2012
A novel self-seeding scheme for hard X-ray FELs journal September 2011
Single Shot Spatial and Temporal Coherence Properties of the SLAC Linac Coherent Light Source in the Hard X-Ray Regime journal January 2012
Review of x-ray free-electron laser theory journal March 2007
Hard X-ray free-electron laser with femtosecond-scale timing jitter journal October 2017
X-ray FEL with a meV bandwidth
  • Saldin, E. L.; Schneidmiller, E. A.; Shvyd'ko, Yu. V.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 475, Issue 1-3 https://doi.org/10.1016/S0168-9002(01)01539-X
journal December 2001
Spatiotemporal response of crystals in x-ray Bragg diffraction journal October 2012
SIMPLEX : simulator and postprocessor for free-electron laser experiments journal August 2015
Maximizing spectral flux from self-seeding hard x-ray free electron lasers journal December 2013
A single-shot transmissive spectrometer for hard x-ray free electron lasers journal July 2012
Single Shot Spatial and Temporal Coherence Properties of the SLAC Linac Coherent Light Source in the Hard X-Ray Regime text January 2012
X-ray FEL with a meV bandwidth
  • Saldin, E. L.
  • 19th Advanced ICFA beam dynamics workshop on physics of, and science with, the x-ray free-electron laser, AIP Conference Proceedings https://doi.org/10.1063/1.1401570
conference January 2001
Time dependence of Bragg forward scattering and self-seeding of hard x-ray free-electron lasers text January 2012
Spatiotemporal Response of Crystals in X-ray Bragg Diffraction text January 2012

Similar Records

The seed energy fluctuation of hard X-ray self-seeding free electron laser
Journal Article · Fri Mar 29 00:00:00 EDT 2019 · AIP Advances · OSTI ID:1576740
+7 more
High-brightness self-seeded X-ray free-electron laser covering the 3.5 keV to 14.6 keV range
Journal Article · Mon Mar 15 00:00:00 EDT 2021 · Nature Photonics · OSTI ID:1576740
+28 more
Two-Bunch Self-Seeding for Narrow-Bandwidth Hard X-Ray Free-Electron Lasers
Journal Article · Fri Jun 04 00:00:00 EDT 2010 · Submitted to Physical Review Special Topics - Accelerators and Beams · OSTI ID:1576740

Related Subjects

47 OTHER INSTRUMENTATION
diamond monochromators
electron-energy jitter
free-electron lasers
hard X-rays
self-amplified spontaneous emission
self-seeding