scholarly journals Single-shot pulse duration monitor for extreme ultraviolet and X-ray free-electron lasers

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
R. Riedel ◽  
A. Al-Shemmary ◽  
M. Gensch ◽  
T. Golz ◽  
M. Harmand ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Free Electron ◽  
Extreme Ultraviolet ◽  
Single Shot ◽  
Free Electron Lasers ◽  
X Ray

scholarly journals Toward unsupervised single-shot diffractive imaging of heterogeneous particles using X-ray free-electron lasers

2013 ◽  
Vol 21 (23) ◽  
pp. 28729 ◽  
Author(s):  
Hyung Joo Park ◽  
N. Duane Loh ◽  
Raymond G. Sierra ◽  
Christina Y. Hampton ◽  
Dmitri Starodub ◽  
...  
Keyword(s):  
Free Electron ◽  
Single Shot ◽  
Free Electron Lasers ◽  
Diffractive Imaging ◽  
X Ray

scholarly journals Switching of the harmonic order in free-electron lasers by controlling the density modulation of an electron bunch

2018 ◽  
Vol 25 (5) ◽  
pp. 1317-1322 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
QiKa Jia
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
Harmonic Order ◽  
Third Harmonic ◽  
X Ray ◽  
The Third ◽  
Density Modulation ◽  
Higher Harmonic

It was demonstrated that harmonic order in free-electron laser (FEL) oscillations could be switched by adjusting the dispersive gap of the optical klystron ETLOK-III in the storage ring NIJI-IV. The effective gains for the fundamental and third-harmonic FEL oscillations were evaluated and it was confirmed that the FEL oscillated at the order of the harmonic with the higher effective gain. The ratio between the effective gain for the fundamental and that for the third harmonic was controlled by the dispersive gap. It was also demonstrated that a spectral measurement of the FEL-based Compton scattering X-ray beam was effective for directly observing the switching of the harmonic order. These results contribute to the development of higher-harmonic FEL oscillations suppressing the fundamental FEL oscillation in the extreme ultraviolet and X-ray regions.

scholarly journals Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

2017 ◽  
Vol 24 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
Shuichi Okuda
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Laser ◽  
Cavity Length ◽  
Extreme Ultraviolet ◽  
Bunch Length ◽  
Free Electron Lasers ◽  
X Ray ◽  
Higher Harmonic

The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated FEL power could be described by the theory of bunch heating, even for the harmonic lasing. Cavity-length detuning curves were measured for the harmonic lasing, and it was found that the width of the detuning curve was proportional to a parameter that depended on the bunch length. These experimental results will be useful for developing compact resonator-type FELs by using higher harmonics in the extreme-ultraviolet and the X-ray regions.

Multi-colour pulses from seeded free-electron-lasers: towards the development of non-linear core-level coherent spectroscopies

2014 ◽  
Vol 171 ◽  
pp. 487-503 ◽  
Author(s):  
Filippo Bencivenga ◽  
Flavio Capotondi ◽  
Francesco Casolari ◽  
Francesco Dallari ◽  
Miltcho B. Danailov ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Core Level ◽  
Wave Mixing ◽  
Free Electron Lasers ◽  
Diffraction Experiment ◽  
X Ray ◽  
Ultrafast Science

We report on new opportunities for ultrafast science thanks to the use of two-colour extreme ultraviolet (XUV) pulses at the FERMI free electron laser (FEL) facility. The two pulses have been employed to carry out a pioneering FEL-pump/FEL-probe diffraction experiment using a Ti target and tuning the FEL pulses to the M2/3-edge in order to explore the dependence of the dielectric constant on the excitation fluence. The future impact that the use of such a two-colour FEL emission will have on the development of ultrafast wave-mixing methods in the XUV/soft X-ray range is addressed and discussed.

scholarly journals Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses

2019 ◽  
Vol 37 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Victor Tkachenko ◽  
Martin Büscher ◽  
Hauke Höppner ◽  
Nikita Medvedev ◽  
Vladimir Lipp ◽  
...  
Keyword(s):  
Free Electron ◽  
Impact Ionization ◽  
Extreme Ultraviolet ◽  
Laser Pulses ◽  
Index Of Refraction ◽  
Single Shot ◽  
Monte Carlo Code ◽  
Thermal Transitions ◽  
Time Jitter ◽  
X Ray

AbstractModern free-electron lasers (FEL) operating in XUV (extreme ultraviolet) or X-ray range allow an access to novel research areas. An example is the ultrafast ionization of a solid by an intense femtosecond FEL pulse in XUV which consequently leads to a change of the complex index of refraction on an ultrashort timescale. The photoionization and subsequent impact ionization resulting in electronic and atomic dynamics are modeled with our hybrid code XTANT(X-ray thermal and non-thermal transitions) and a Monte Carlo code XCASCADE(X-ray-induced electron cascades). The simulations predict the temporal kinetics of FEL-induced electron cascades and thus yield temporally and spatially resolved information on the induced changes of the optical properties. In a series of experiments at FERMI and LCLS, single shot measurements with spatio-temporal encoding of the ionization process have been performed by a correlation of the FEL pump pulse with an optical femtosecond probe pulse. An excellent agreement between the experiment and the simulation has been found. We also show that such kind of experiments forms the basis for pulse duration and arrival time jitter monitoring as currently under development for XUV-FELs.

scholarly journals The free-electron laser FLASH

2015 ◽  
Vol 3 ◽  
Author(s):  
Siegfried Schreiber ◽  
Bart Faatz
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Laser Flash ◽  
Single Shot ◽  
Short Pulses ◽  
X Ray ◽  
Pump And Probe ◽  
User Facility ◽  
Diffraction Imaging

FLASH at DESY, Hamburg, Germany is the first free-electron laser (FEL) operating in the extreme ultraviolet (EUV) and soft x-ray wavelength range. FLASH is a user facility providing femtosecond short pulses with an unprecedented peak and average brilliance, opening new scientific opportunities in many disciplines. The first call for user experiments has been launched in 2005. The FLASH linear accelerator is based on TESLA superconducting technology, providing several thousands of photon pulses per second to user experiments. Probing femtosecond-scale dynamics in atomic and molecular reactions using, for instance, a combination of x-ray and optical pulses in a pump and probe arrangement, as well as single-shot diffraction imaging of biological objects and molecules, are typical experiments performed at the facility. We give an overview of the FLASH facility, and describe the basic principles of the accelerator. Recently, FLASH has been extended by a second undulator beamline (FLASH2) operated in parallel to the first beamline, extending the capacity of the facility by a factor of two.

Free-electron laser multiplex driven by a superconducting linear accelerator

2016 ◽  
Vol 23 (5) ◽  
pp. 1070-1075 ◽  
Author(s):  
Tim Plath ◽  
Philipp Amstutz ◽  
Jörn Bödewadt ◽  
Günter Brenner ◽  
Nagitha Ekanayake ◽  
...  
Keyword(s):  
Research And Development ◽  
Free Electron ◽  
Free Electron Laser ◽  
Linear Accelerator ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
X Ray ◽  
User Facility ◽  
20 Nm ◽  
Simultaneous Lasing

Free-electron lasers (FELs) generate femtosecond XUV and X-ray pulses at peak powers in the gigawatt range. The FEL user facility FLASH at DESY (Hamburg, Germany) is driven by a superconducting linear accelerator with up to 8000 pulses per second. Since 2014, two parallel undulator beamlines, FLASH1 and FLASH2, have been in operation. In addition to the main undulator, the FLASH1 beamline is equipped with an undulator section, sFLASH, dedicated to research and development of fully coherent extreme ultraviolet photon pulses using external seed lasers. In this contribution, the first simultaneous lasing of the three FELs at 13.4 nm, 20 nm and 38.8 nm is presented.

A single-shot transmissive spectrometer for hard x-ray free electron lasers

2012 ◽  
Vol 101 (3) ◽  
pp. 034103 ◽  
Author(s):  
Diling Zhu ◽  
Marco Cammarata ◽  
Jan M. Feldkamp ◽  
David M. Fritz ◽  
Jerome B. Hastings ◽  
...  
Keyword(s):  
Free Electron ◽  
Single Shot ◽  
Free Electron Lasers ◽  
X Ray

Coherent and transient states studied with extreme ultraviolet and X-ray free electron lasers: present and future prospects

2014 ◽  
Vol 63 (5-6) ◽  
pp. 327-404 ◽  
Author(s):  
F. Bencivenga ◽  
F. Capotondi ◽  
E. Principi ◽  
M. Kiskinova ◽  
C. Masciovecchio
Keyword(s):  
Free Electron ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
Future Prospects ◽  
X Ray ◽  
Transient States
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