Advanced

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

Miaja-Avila, L.; O'Neil, G. C.; Uhlig, Jens LU ; Cromer, C. L.; Dowell, M. L.; Jimenez, R.; Hoover, A. S.; Silverman, K. L. and Ullom, J. N. (2015) In Structural Dynamics 2(2).
Abstract
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 mu m FWHM x-ray spot size, containing similar to 10(6) 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 >10(7) laser pulses, we also present data on the source stability, including single pulse measurements of the x-ray yield and the x-ray... (More)
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 mu m FWHM x-ray spot size, containing similar to 10(6) 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 >10(7) 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. (C) 2015 Author(s). (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Structural Dynamics
volume
2
issue
2
publisher
American Institute of Physics
external identifiers
  • wos:000354994100006
  • scopus:84929497227
  • pmid:26798792
ISSN
2329-7778
DOI
10.1063/1.4913585
language
English
LU publication?
yes
id
352379fe-f691-470f-89df-2908cd4da952 (old id 7422438)
date added to LUP
2015-06-26 13:53:06
date last changed
2017-11-19 03:55:15
@article{352379fe-f691-470f-89df-2908cd4da952,
  abstract     = {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 mu m FWHM x-ray spot size, containing similar to 10(6) 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 >10(7) 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. (C) 2015 Author(s).},
  articleno    = {024301},
  author       = {Miaja-Avila, L. and O'Neil, G. C. and Uhlig, Jens and Cromer, C. L. and Dowell, M. L. and Jimenez, R. and Hoover, A. S. and Silverman, K. L. and Ullom, J. N.},
  issn         = {2329-7778},
  language     = {eng},
  number       = {2},
  publisher    = {American Institute of Physics},
  series       = {Structural Dynamics},
  title        = {Laser plasma x-ray source for ultrafast time-resolved x-ray absorption spectroscopy},
  url          = {http://dx.doi.org/10.1063/1.4913585},
  volume       = {2},
  year         = {2015},
}