scholarly journals Coherent electron beam density modulator for driving X-ray free electron lasers

2015 ◽  
Vol 774 ◽  
pp. 127-132
Author(s):  
A. Novokhatski ◽  
F.-J. Decker ◽  
B. Hettel ◽  
Yu. Nosochkov ◽  
M. Sullivan
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Lasers ◽  
Beam Density ◽  
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.

scholarly journals Two-color operation of a free-electron laser with a tilted beam

2016 ◽  
Vol 23 (4) ◽  
pp. 869-873 ◽  
Author(s):  
Sven Reiche ◽  
Eduard Prat
Keyword(s):  
Electron Beam ◽  
Photon Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Tuning Range ◽  
Free Electron Lasers ◽  
Successful Operation ◽  
X Ray ◽  
Two Photon ◽  
Gap Control

With the successful operation of free-electron lasers (FELs) as user facilities there has been a growing demand for experiments with two photon pulses with variable photon energy and time separation. A configuration of an undulator with variable-gap control and a delaying chicane in the middle of the beamline is proposed. An injected electron beam with a transverse tilt will only yield FEL radiation for the parts which are close to the undulator axis. This allows, after re-aligning and delaying the electron beam, a different part of the bunch to be used to produce a second FEL pulse. This method offers independent control in photon energy and delay. For the parameters of the soft X-ray beamline Athos at the SwissFEL facility the photon energy tuning range is a factor of five with an adjustable delay between the two pulses from −50 to 950 fs.

scholarly journals Laser-Driven Modulation of Electron Beams in a Dielectric Micro-Structure for X-Ray Free-Electron Lasers

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Benedikt Hermann ◽  
Simona Bettoni ◽  
Thilo Egenolf ◽  
Uwe Niedermayer ◽  
Eduard Prat ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Modulation Scheme ◽  
Dielectric Structure ◽  
Free Electron Lasers ◽  
Micro Structure ◽  
X Ray ◽  
Beam Parameters ◽  
The Individual ◽  
Micrometer Scale

AbstractWe describe an application of laser-driven modulation in a dielectric micro-structure for the electron beam in a free-electron laser (FEL). The energy modulation is transferred into longitudinal bunching via compression in a magnetic chicane before entering the undulator section of the FEL. The bunched electron beam comprises a series of enhanced current spikes separated by the wavelength of the modulating laser. For beam parameters of SwissFEL at a total bunch charge of 30 pC, the individual spikes are expected to be as short as 140 as (FWHM) with peak currents exceeding 4 kA. The proposed modulation scheme requires the electron beam to be focused into the micrometer scale aperture of the dielectric structure, which imposes strict emittance and charge limitations, but, due to the small interaction region, the scheme is expected to require ten times less laser power as compared to laser modulation in a wiggler magnet, which is the conventional approach to create a pulse train in FELs.

scholarly journals Using irregularly spaced current peaks to generate an isolated attosecond X-ray pulse in free-electron lasers

2016 ◽  
Vol 23 (6) ◽  
pp. 1273-1281 ◽  
Author(s):  
Takashi Tanaka ◽  
Yong Woon Parc ◽  
Yuichiro Kida ◽  
Ryota Kinjo ◽  
Chi Hyun Shim ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Peak Power ◽  
Short Pulse ◽  
Pulse Length ◽  
Free Electron Lasers ◽  
X Ray ◽  
Similar Scheme ◽  
Irregular Arrangement ◽  
Optical Laser

A method is proposed to generate an isolated attosecond X-ray pulse in free-electron lasers, using irregularly spaced current peaks induced in an electron beam through interaction with an intense short-pulse optical laser. In comparison with a similar scheme proposed in a previous paper, the irregular arrangement of current peaks significantly improves the contrast between the main and satellite pulses, enhances the attainable peak power and simplifies the accelerator layout. Three different methods are proposed for this purpose and achievable performances are computed under realistic conditions. Numerical simulations carried out with the best configuration show that an isolated 7.7 keV X-ray pulse with a peak power of 1.7 TW and pulse length of 70 as can be generated. In this particular example, the contrast is improved by two orders of magnitude and the peak power is enhanced by a factor of three, when compared with the previous scheme.

The Next Generation of X-ray Sources

2010 ◽  
Vol 03 (01) ◽  
pp. 185-202 ◽  
Author(s):  
Claudio Pellegrini
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
High Intensity ◽  
Femtosecond Pulse ◽  
Narrow Linewidth ◽  
Free Electron Lasers ◽  
Next Generation ◽  
Successful Development ◽  
High Brightness ◽  
X Ray

We discuss recent results on soft and hard X-ray free electron lasers (FELs) and how they can be used to design and optimize the next generation of these sources of high brightness, coherent photons, with femtosecond pulse duration, or very narrow linewidth. In particular, we consider the experimental and theoretical progress in the electron beam generation and manipulation. These results, when combined with the successful development of powerful simulation codes, can be used to design optimized, high intensity sources of coherent photons, and to reduce their size and cost.

scholarly journals Delay-detune scan for longitudinal electron beam characterization at free-electron lasers

2020 ◽  
Vol 23 (12) ◽  
Author(s):  
Svitozar Serkez ◽  
Gianluca Geloni ◽  
Marc Guetg ◽  
Vitali Kocharyan ◽  
Shan Liu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Lasers ◽  
Beam Characterization

scholarly journals Using X-ray free-electron lasers for spectroscopy of molecular catalysts and metalloenzymes

2021 ◽  
Author(s):  
Uwe Bergmann ◽  
Jan Kern ◽  
Robert W. Schoenlein ◽  
Philippe Wernet ◽  
Vittal K. Yachandra ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Lasers ◽  
X Ray ◽  
Molecular Catalysts

scholarly journals Features and futures of X-ray free-electron lasers

2021 ◽  
pp. 100097
Author(s):  
Nanshun Huang ◽  
Haixiao Deng ◽  
Bo Liu ◽  
Dong Wang ◽  
Zhentang Zhao
Keyword(s):  
Free Electron ◽  
Free Electron Lasers ◽  
X Ray
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