FEL2014 - List of Authors (Krzywinski, J.)

Paper

Title

Page

Soft X-ray Self-seeding Simulation Methods and their Application for LCLS

264

S. Serkez
DESY, Hamburg, Germany
Y. Ding, Z. Huang, J. Krzywinski
SLAC, Menlo Park, California, USA

Self-seeding is a promising approach to significantly narrow the SASE bandwidth of XFELs to produce nearly transform-limited pulses. We study radiation propagation through the grating monochromator installed at LCLS. The monochromator design is based on a toroidal variable line spacing grating working at a fixed incidence angle mounting without an entrance slit. It covers the spectral range from 500eV to 1000eV. The optical system was studied using wave optics method to evaluate the performance of the self-seeding scheme. Our wave optics analysis takes into account the finite size of the coherent source, third-order aberrations and height error of the optical elements. Wave optics is the only method available, in combination with FEL simulations, to simulate performance of the monochromator without exit slit. Two approaches for time-dependent simulations are presented, compared and discussed. Also pulse-front tilt phenomenon effect is illustrated.

TUB03

FEL Overcompression in the LCLS

337

J.L. Turner, F.-J. Decker, Y. Ding, Z. Huang, R.H. Iverson, J. Krzywinski, H. Loos, A. Marinelli, T.J. Maxwell, H.-D. Nuhn, D.F. Ratner, T.J. Smith, J.J. Welch, F. Zhou
SLAC, Menlo Park, California, USA

Funding: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-AC02-76SF00515
Overcompression of the Linac Coherent Light Source (LCLS) x-ray Free Electron Laser (FEL) at the SLAC National Accelerator Center is studied. The studies and operational implications are summarized in this talk.

Slides TUB03 [4.493 MB]

TUC02

Soft X-ray Self-seeding Setup and Results at LCLS

D.F. Ratner, J.W. Amann, D.K. Bohler, M. Boyes, D. Cocco, F.-J. Decker, Y. Ding, D. Fairley, Y. Feng, J.B. Hastings, P.A. Heimann, Z. Huang, J. Krzywinski, H. Loos, A.A. Lutman, G. Marcus, A. Marinelli, T.J. Maxwell, S.P. Moeller, P.A. Montanez, D.S. Morton, H.-D. Nuhn, D.R. Walz, J.J. Welch, J. Wu
SLAC, Menlo Park, California, USA
K. Chow, L.N. Rodes
LBNL, Berkeley, California, USA
U. Flechsig
PSI, Villigen PSI, Switzerland
S. Serkez
DESY, Hamburg, Germany

The soft X-ray self seeding program was designed to provide near transform-limited pulses in the range of 500 eV to 1000 eV. The project was a three-way collaboration between SLAC, Lawrence Berkeley National Lab, and the Paul Scherrer Institute in Switzerland. Installation finished in the Fall of 2013, and after the early stages of commissioning we have measured up to 0.5mJ pulse energy and resolving powers of up to 5000 across the design wavelength range, representing a several-fold increase in the brightness compared to the normal LCLS operating mode. Future work will aim to increase the total pulse energy and establish self-seeding as a robust user operation mode.

Slides TUC02 [10.464 MB]

FRA01

Prospects of Stimulated X-ray Raman Scattering with Free-Electron Laser Sources

N. Rohringer, V. Kimberg, C. Weninger
Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
M. Agaker, R. Feifel, M. Mucke, J. Nordgren, J.E. Rubensson, C. Sathe, R. Squibb, V. Zhaunerchyk
Uppsala University, Uppsala, Sweden
C. Bostedt, J.D. Bozek, S. Carron Montero, R.N. Coffee, J. Krzywinski, A. Lindahl, A. Lutmann, T.J. Maxwell
SLAC, Menlo Park, California, USA
B. Erk, D. Rolles
DESY, Hamburg, Germany
M. Ilchen
XFEL. EU, Hamburg, Germany
T. Kierspel, J. Küpper, T.G. Mullins
University of Hamburg, Hamburg, Germany
O.D. Mücke
CFEL, Hamburg, Germany
M. Purvis, J.J. Rocca, D.P. Ryan
CSU, Fort Collins, Colorado, USA
A. Sanchez-Gonzalez
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

XFELs might open the pathway to transfer non-linear spectroscopic techniques to the x-ray domain, to study electron motion at unprecedented time and length scales. A promising x-ray pump probe technique is based on stimulated electronic x-ray Raman scattering. I will present the first experimental demonstration of stimulated electronic x-ray Raman scattering in a gas sample of neon*. Despite the limited spectral coherence of SASE XFELs, high-resolution spectra can be obtained by statistical methods, opening the path to coherent stimulated x-ray Raman spectroscopy. An extension of these ideas to molecules** and the results of a recent experiment in CO will be discussed. The high-gain regime, involving exponential amplification and strong-field effects will be contrasted to stimulated scattering at moderate x-ray intensities, more appropriate for spectroscopic studies. A critically assessment of the feasibility of nonlinear x-ray spectroscopic techniques and requirements on the stability and pulse parameters of XFEL sources that could enable these new techniques, will be presented.
* C. Weninger et al., Phys. Rev. Lett. 111, 233902 (2013)
** C. Weninger and N. Rohringer, Phys Rev A 88, 053421 (2013)

Slides FRA01 [3.771 MB]

Paper	Title	Page
MOP090	Soft X-ray Self-seeding Simulation Methods and their Application for LCLS	264
	S. Serkez DESY, Hamburg, Germany Y. Ding, Z. Huang, J. Krzywinski SLAC, Menlo Park, California, USA
	Self-seeding is a promising approach to significantly narrow the SASE bandwidth of XFELs to produce nearly transform-limited pulses. We study radiation propagation through the grating monochromator installed at LCLS. The monochromator design is based on a toroidal variable line spacing grating working at a fixed incidence angle mounting without an entrance slit. It covers the spectral range from 500eV to 1000eV. The optical system was studied using wave optics method to evaluate the performance of the self-seeding scheme. Our wave optics analysis takes into account the finite size of the coherent source, third-order aberrations and height error of the optical elements. Wave optics is the only method available, in combination with FEL simulations, to simulate performance of the monochromator without exit slit. Two approaches for time-dependent simulations are presented, compared and discussed. Also pulse-front tilt phenomenon effect is illustrated.

TUB03	FEL Overcompression in the LCLS	337
	J.L. Turner, F.-J. Decker, Y. Ding, Z. Huang, R.H. Iverson, J. Krzywinski, H. Loos, A. Marinelli, T.J. Maxwell, H.-D. Nuhn, D.F. Ratner, T.J. Smith, J.J. Welch, F. Zhou SLAC, Menlo Park, California, USA
	Funding: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-AC02-76SF00515 Overcompression of the Linac Coherent Light Source (LCLS) x-ray Free Electron Laser (FEL) at the SLAC National Accelerator Center is studied. The studies and operational implications are summarized in this talk.
	Slides TUB03 [4.493 MB]

TUC02	Soft X-ray Self-seeding Setup and Results at LCLS
	D.F. Ratner, J.W. Amann, D.K. Bohler, M. Boyes, D. Cocco, F.-J. Decker, Y. Ding, D. Fairley, Y. Feng, J.B. Hastings, P.A. Heimann, Z. Huang, J. Krzywinski, H. Loos, A.A. Lutman, G. Marcus, A. Marinelli, T.J. Maxwell, S.P. Moeller, P.A. Montanez, D.S. Morton, H.-D. Nuhn, D.R. Walz, J.J. Welch, J. Wu SLAC, Menlo Park, California, USA K. Chow, L.N. Rodes LBNL, Berkeley, California, USA U. Flechsig PSI, Villigen PSI, Switzerland S. Serkez DESY, Hamburg, Germany
	The soft X-ray self seeding program was designed to provide near transform-limited pulses in the range of 500 eV to 1000 eV. The project was a three-way collaboration between SLAC, Lawrence Berkeley National Lab, and the Paul Scherrer Institute in Switzerland. Installation finished in the Fall of 2013, and after the early stages of commissioning we have measured up to 0.5mJ pulse energy and resolving powers of up to 5000 across the design wavelength range, representing a several-fold increase in the brightness compared to the normal LCLS operating mode. Future work will aim to increase the total pulse energy and establish self-seeding as a robust user operation mode.
	Slides TUC02 [10.464 MB]

FRA01	Prospects of Stimulated X-ray Raman Scattering with Free-Electron Laser Sources
	N. Rohringer, V. Kimberg, C. Weninger Max Planck Institute for the Physics of Complex Systems, Dresden, Germany M. Agaker, R. Feifel, M. Mucke, J. Nordgren, J.E. Rubensson, C. Sathe, R. Squibb, V. Zhaunerchyk Uppsala University, Uppsala, Sweden C. Bostedt, J.D. Bozek, S. Carron Montero, R.N. Coffee, J. Krzywinski, A. Lindahl, A. Lutmann, T.J. Maxwell SLAC, Menlo Park, California, USA B. Erk, D. Rolles DESY, Hamburg, Germany M. Ilchen XFEL. EU, Hamburg, Germany T. Kierspel, J. Küpper, T.G. Mullins University of Hamburg, Hamburg, Germany O.D. Mücke CFEL, Hamburg, Germany M. Purvis, J.J. Rocca, D.P. Ryan CSU, Fort Collins, Colorado, USA A. Sanchez-Gonzalez Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	XFELs might open the pathway to transfer non-linear spectroscopic techniques to the x-ray domain, to study electron motion at unprecedented time and length scales. A promising x-ray pump probe technique is based on stimulated electronic x-ray Raman scattering. I will present the first experimental demonstration of stimulated electronic x-ray Raman scattering in a gas sample of neon. Despite the limited spectral coherence of SASE XFELs, high-resolution spectra can be obtained by statistical methods, opening the path to coherent stimulated x-ray Raman spectroscopy. An extension of these ideas to molecules* and the results of a recent experiment in CO will be discussed. The high-gain regime, involving exponential amplification and strong-field effects will be contrasted to stimulated scattering at moderate x-ray intensities, more appropriate for spectroscopic studies. A critically assessment of the feasibility of nonlinear x-ray spectroscopic techniques and requirements on the stability and pulse parameters of XFEL sources that could enable these new techniques, will be presented. * C. Weninger et al., Phys. Rev. Lett. 111, 233902 (2013) ** C. Weninger and N. Rohringer, Phys Rev A 88, 053421 (2013)
	Slides FRA01 [3.771 MB]