scholarly journals Three-dimensional manipulation of electron beam phase space for seeding soft x-ray free-electron lasers

2014 ◽  
Vol 17 (7) ◽  
Author(s):  
Chao Feng ◽  
Tong Zhang ◽  
Haixiao Deng ◽  
Zhentang Zhao
Keyword(s):  
Electron Beam ◽  
Phase Space ◽  
Free Electron ◽  
Three Dimensional ◽  
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.

scholarly journals Design of a liquid cell toward three-dimensional imaging of unidirectionally-aligned particles in solution using X-ray free-electron lasers

2020 ◽  
Vol 22 (5) ◽  
pp. 2622-2628 ◽  
Author(s):  
Akihiro Suzuki ◽  
Takashi Kimura ◽  
Ying Yang ◽  
Yoshiya Niida ◽  
Akiko Nishioka ◽  
...  
Keyword(s):  
Free Electron ◽  
Three Dimensional ◽  
Free Electron Lasers ◽  
Diffractive Imaging ◽  
Three Dimensional Imaging ◽  
X Ray ◽  
Coherent Diffractive Imaging ◽  
Liquid Cell

A liquid cell was designed for coherent diffractive imaging measurements at high tilt angles and tested at SACLA.

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 Time-resolved electron beam phase space tomography at a soft x-ray free-electron laser

2009 ◽  
Vol 12 (5) ◽  
Author(s):  
Michael Röhrs ◽  
Christopher Gerth ◽  
Holger Schlarb ◽  
Bernhard Schmidt ◽  
Peter Schmüser
Keyword(s):  
Electron Beam ◽  
Phase Space ◽  
Free Electron ◽  
Free Electron Laser ◽  
Time Resolved ◽  
X Ray

scholarly journals Physics of Superpulses in Storage Ring Free-Electron Lasers

2008 ◽  
Vol 2008 ◽  
pp. 1-5
Author(s):  
Vladimir N. Litvinenko
Keyword(s):  
Electron Beam ◽  
Phase Space ◽  
Harmonic Generation ◽  
Storage Ring ◽  
Free Electron ◽  
Power Level ◽  
Free Electron Lasers ◽  
Nonlinear Processes ◽  
Lasing Power

Contradictory to the widespread perception, storage ring free-electron lasers with substantial net gain can generate peak lasing power reaching GW levels in the so-called superpulse mode. This power level is sufficient for studies of nonlinear processes and efficient intracavity harmonic generation. This letter describes the physics of the superpulses and a phase-space refreshment in the electron beam responsible for this phenomenon.

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