Two-bunch operation with ns temporal separation at the FERMI FEL facility

Penco, G.; Allaria, E.; Bassanese, S.; Cinquegrana, Paolo; Cleva, Stefano; Danailov, M. B.; Demidovich, Alexander; Ferianis, M.; Gaio, G.; Giannessi, L.; Masciovecchio, C.; Predonzani, M.; Rossi, Fabio; Roussel, Eléonore; Spampinati, S.; Trovò, M.

doi:10.1088/1367-2630/aac059

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…In multi-bucket schemes, the electron bunches are delayed by multiples of the accelerating period. Different bunch energies are achievable by either injecting the bunches at different phases or by employing the finite width of the radio frequency accelerating pulse [43,44].…”

Section: (I) Multi-bunch X-ray Felsmentioning

confidence: 99%

Development of ultrafast capabilities for X-ray free-electron lasers at the linac coherent light source

Coffee

Cryan

Duris

et al. 2019

Phil. Trans. R. Soc. A.

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The ability to produce ultrashort, high-brightness X-ray pulses is revolutionizing the field of ultrafast X-ray spectroscopy. Free-electron laser (FEL) facilities are driving this revolution, but unique aspects of the FEL process make the required characterization and use of the pulses challenging. In this paper, we describe a number of developments in the generation of ultrashort X-ray FEL pulses, and the concomitant progress in the experimental capabilities necessary for their characterization and use at the Linac Coherent Light Source. This includes the development of sub-femtosecond hard and soft X-ray pulses, along with ultrafast characterization techniques for these pulses. We also describe improved techniques for optical cross-correlation as needed to address the persistent challenge of external optical laser synchronization with these ultrashort X-ray pulses. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

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Section: (I) Multi-bunch X-ray Felsmentioning

confidence: 99%

Development of ultrafast capabilities for X-ray free-electron lasers at the linac coherent light source

Coffee

Cryan

Duris

et al. 2019

Phil. Trans. R. Soc. A.

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“…So far XPS has been mainly used for static spectroscopy but the recent developments in ultrashort-X-ray-pulse sources have led to a renaissance of XPS for time-resolved studies. The capacity of XFELs to deliver a sequence of two femtosecond X-ray pulses [19][20][21][22][23][24][25][26][27] allows for the implementation of the proposed scheme.…”

Section: Hetero-site Pump-probe Schemementioning

confidence: 99%

Site-selective-induced isomerization of formamide

Oberli

González‐Vázquez

Rodríguez-Perelló

et al. 2019

Phys. Chem. Chem. Phys.

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The new capacity of X-ray free-electron laser (XFEL) facilities to produce multi-color Xray femtosecond pulses paves the way to explore ultrafast phenomena in matter induced by X-ray photons. In the present study, we exploit the site selectivity and the high temporal resolution of a two-color X-ray femtosecond pump-probe sequence to investigate the isomerization of formamide. The pump pulse excites a particular atomic site in the molecule, while the probe pulse captures changes in the chemical environment at a remote atomic site. The response of the system is found to strongly depends on the nature of the excited site, and the core excitation provides a selective control on chemical bond breaking. In particular, we show that the N1s → π * transition favors the isomerization reaction in formamide and demonstrate the possibility to observe in real time the hydrogen migration by measuring the time-dependent chemical shifts with the X-ray probe pulse. This work opens a unique perspective for X-rayinduced photochemistry at XFEL facilities.

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“…FEL pulses at a shorter time separation ("two-pulse" mode) are all driven by electron bunches passing through the same undulator line. For example, nanosecond delay is obtained with the acceleration of twin electron bunches in consecutive rf buckets [24][25][26]. Twin bunches can be made closer at hundreds of femtosecond separation, but their longitudinal dynamics are tightly coupled [9,10].…”

Section: Introductionmentioning

confidence: 99%

Simple and robust free-electron laser doubler

Mitri

Ninno

Fabris

et al. 2019

Phys. Rev. Accel. Beams

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We present the design of a free-electron laser (FEL) doubler suitable for the simultaneous operation of two FEL lines, in either self-amplified spontaneous emission or externally seeded configuration. The doubler relies on the physical selection of two longitudinal portions (beamlets) of a single electron bunch at a low energy and on their spatial separation at high energy. Since the two beamlets are naturally synchronized, FEL pump-FEL probe experiments are enabled when the two photon pulses are sent to the same experimental station. The proposed solution offers improved flexibility of operation compared with existing or designed two-pulse, two-color FEL schemes, as it allows independent control and continuous tunability of the color, timing, intensity, and angle of incidence of the radiation pulses at the user end station. Detailed numerical simulations and experimental results demonstrate its feasibility at the Free Electron laser Radiation for Multidisciplinary Investigations (FERMI) FEL facility.

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Two-bunch operation with ns temporal separation at the FERMI FEL facility

Cited by 7 publications

References 32 publications

Development of ultrafast capabilities for X-ray free-electron lasers at the linac coherent light source

Development of ultrafast capabilities for X-ray free-electron lasers at the linac coherent light source

Site-selective-induced isomerization of formamide

Simple and robust free-electron laser doubler

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