scholarly journals Development of experimental techniques for the characterization of ultrashort photon pulses of extreme ultraviolet free-electron lasers

2014 ◽  
Vol 17 (12) ◽  
Author(s):  
S. Düsterer ◽  
M. Rehders ◽  
A. Al-Shemmary ◽  
C. Behrens ◽  
G. Brenner ◽  
...  
Keyword(s):  
Free Electron ◽  
Extreme Ultraviolet ◽  
Experimental Techniques ◽  
Free Electron Lasers

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 Undulator commissioning by characterization of radiation in x-ray free electron lasers

2012 ◽  
Vol 15 (11) ◽  
Author(s):  
Takashi Tanaka ◽  
Shunji Goto ◽  
Toru Hara ◽  
Takaki Hatsui ◽  
Haruhiko Ohashi ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Lasers ◽  
X Ray

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 Electron and photon diagnostics for plasma acceleration-based FELs

2018 ◽  
Vol 25 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Marie Labat ◽  
Moussa El Ajjouri ◽  
Nicolas Hubert ◽  
Thomas Andre ◽  
Alexandre Loulergue ◽  
...  
Keyword(s):  
Free Electron ◽  
Critical Issue ◽  
Free Electron Lasers ◽  
Plasma Acceleration ◽  
Radiation Delivery ◽  
The World ◽  
Transport Line ◽  
Electron And Photon

It is now well established that laser plasma acceleration (LPA) is an innovative and good candidate in the beam acceleration field. Relativistic beams are indeed produced up to several GeV but their quality remains to be demonstrated in the highly demanding case of free-electron lasers (FELs). Several experiments have already shown the feasibility of synchrotron radiation delivery based on LPA but free-electron lasing has still to be achieved. Since the quality of the LPA beam inside the undulator is the critical issue, any LPA-based FEL experiment requires a refined characterization of the beam properties along the transport line and of the photon beam at the undulator exit. This characterization relies on diagnostics which must be adapted to the LPA specificities. Here, the electron and photon diagnostics already used on LPAs and required for LPA-based FELs are reviewed, and the critical points are illustrated using recent experiments performed around the world.

Characterization of Ce:LuLiF4 as fast scintillator using storage ring free-electron lasers

2008 ◽  
Author(s):  
Yusuke Furukawa ◽  
Tomoharu Nakazato ◽  
Marilou Cadatal ◽  
Minh Pham ◽  
Toshihiro Tatsumi ◽  
...  
Keyword(s):  
Storage Ring ◽  
Free Electron ◽  
Free Electron Lasers

scholarly journals Extreme-ultraviolet compact spectrometer for the characterization of the harmonics content in the free-electron-laser radiation at FLASH

2012 ◽  
Vol 19 (4) ◽  
pp. 596-601 ◽  
Author(s):  
Fabio Frassetto ◽  
Stefano Coraggia ◽  
Siarhei Dziarzhytski ◽  
Natalia Gerasimova ◽  
Luca Poletto
Keyword(s):  
Laser Radiation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet
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