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Title: Laser plasma x-ray source for ultrafast time-resolved x-ray absorption spectroscopy

Journal Article · · Structural Dynamics
DOI:https://doi.org/10.1063/1.4913585· OSTI ID:1212188
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [1];  [1]
  1. National Institute of Standards and Technology, Boulder, CO (United States)
  2. Lund Univ. (Sweden). Department of Chemical Physics.
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We describe a laser-driven x-ray plasma source designed for ultrafast x-ray absorption spectroscopy. The source is comprised of a 1 kHz, 20 W, femtosecond pulsed infrared laser and a water target. We present the x-ray spectra as a function of laser energy and pulse duration. Additionally, we investigate the plasma temperature and photon flux as we vary the laser energy. We obtain a 75 μm FWHM x-ray spot size, containing ~106 photons/s, by focusing the produced x-rays with a polycapillary optic. Since the acquisition of x-ray absorption spectra requires the averaging of measurements from >107 laser pulses, we also present data on the source stability, including single pulse measurements of the x-ray yield and the x-ray spectral shape. In single pulse measurements, the x-ray flux has a measured standard deviation of 8%, where the laser pointing is the main cause of variability. Further, we show that the variability in x-ray spectral shape from single pulses is low, thus justifying the combining of x-rays obtained from different laser pulses into a single spectrum. Finally, we show a static x-ray absorption spectrum of a ferrioxalate solution as detected by a microcalorimeter array. Altogether, our results demonstrate that this water-jet based plasma source is a suitable candidate for laboratory-based time-resolved x-ray absorption spectroscopy experiments.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1212188
Journal Information:
Structural Dynamics, Vol. 2, Issue 2; ISSN 2329-7778
Publisher:
American Crystallographic Association/AIPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Violation of centrosymmetry in time-resolved coherent x-ray diffraction from rovibrational states of diatomic molecules journal March 2019
Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop journal September 2016
High-resolution X-ray emission spectroscopy with transition-edge sensors: present performance and future potential journal April 2015
High resolution X-ray spectra of stainless steel foils irradiated by femtosecond laser pulses with ultra-relativistic intensities journal January 2017
Beating Darwin-Bragg losses in lab-based ultrafast x-ray experiments journal July 2017