The monochromator beamline at FLASH: performance, capabilities and upgrade plans

Gerasimova, Natalia; Dziarzhytski, Siarhei; Feldhaus, J.

doi:10.1080/09500340.2011.588344

Cited by 61 publications

(52 citation statements)

References 12 publications

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“…To that end, several grating spectrometers available at FLASH have been involved in the measurement for comparison and to serve as a wavelength reference. Most importantly, the PG monochromator beamline in spectrometer mode, referred to as the PG spectrometer (PGS) (Martins et al, 2006;Gerasimova et al, 2011), and the mobile compact spectrometer (CS) (Frasetto et al, 2011) which can be installed at any experimental station of the FLASH beamlines were used for that purpose. The uncertainty of wavelength measurements of the PG spectrometer varies to some extent over the complete FLASH wavelength range.…”

Section: Methodsmentioning

confidence: 99%

A non-invasive online photoionization spectrometer for FLASH2

Braune

Brenner

Dziarzhytski

et al. 2016

J Synchrotron Radiat

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The stochastic nature of the self-amplified spontaneous emission (SASE) process of free-electron lasers (FELs) effects pulse-to-pulse fluctuations of the radiation properties, such as the photon energy, which are determinative for processes of photon-matter interactions. Hence, SASE FEL sources pose a great challenge for scientific investigations, since experimenters need to obtain precise real-time feedback of these properties for each individual photon bunch for interpretation of the experimental data. Furthermore, any device developed to deliver the according information should not significantly interfere with or degrade the FEL beam. Regarding the spectral properties, a device for online monitoring of FEL wavelengths has been developed for FLASH2, which is based on photoionization of gaseous targets and the measurements of the corresponding electron and ion time-of-flight spectra. This paper presents experimental studies and cross-calibration measurements demonstrating the viability of this online photoionization spectrometer.

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Section: Methodsmentioning

confidence: 99%

A non-invasive online photoionization spectrometer for FLASH2

Braune

Brenner

Dziarzhytski

et al. 2016

J Synchrotron Radiat

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“…The PG beamline has the capability to use the non-dispersed zero-order beam as well as higher diffraction orders simultaneously. While the zeroth order of the diffraction grating can be guided to the streaking setup at PG0, the dispersed radiation can be simultaneously used in the PG2 beamline branch to, for example, measure the XUV spectrum with high resolution (Gerasimova et al, 2011). By measuring the spectral distribution for each FEL pulse we can disentangle the spectral and the temporal contributions.…”

Section: Thz Streaking Setupmentioning

confidence: 99%

FLASH free-electron laser single-shot temporal diagnostic: terahertz-field-driven streaking

et al. 2018

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The commissioning of a terahertz-field-driven streak camera installed at the free-electron laser (FEL) FLASH at DESY in Hamburg, being able to deliver photon pulse duration as well as arrival time information with $ 10 fs resolution for each single XUV FEL pulse, is reported. Pulse durations between 300 fs and <15 fs have been measured for different FLASH FEL settings. A comparison between the XUV pulse arrival time and the FEL electron bunch arrival time measured at the FLASH linac section exhibits a correlation width of 20 fs r.m.s., thus demonstrating the excellent operation stability of FLASH. In addition, the terahertz-streaking setup was operated simultaneously to an alternative method to determine the FEL pulse duration based on spectral analysis. FLASH pulse duration derived from simple spectral analysis is in good agreement with that from terahertz-streaking measurement.

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“…At present, there are two FEL beamlines operated with a monochromator, one at FLASH (see References [11,12]) and one at LCLS (see Reference [13]). They adopt the single-grating design, since it is the simplest one and is already used in many synchrotrons.…”

Section: Double-grating Monochromators For Ultrashort Pulsesmentioning

confidence: 99%

Grating Configurations for the Spectral Selection of Coherent Ultrashort Pulses in the Extreme-Ultraviolet

2014

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Abstract:The design and realization of grating instruments to handle and condition coherent ultrafast pulses in the extreme ultraviolet spectral region are discussed. The main application of such instruments is the spectral selection of high-order laser harmonics and free-electron-laser pulses in the femtosecond time scale. Broad-band monochromators require the use of diffraction gratings at grazing incidence. Here, we discuss two configurations useful for the realization of grating monochromator with ultrafast response: the single-grating design, applied to high-order laser harmonics, and the time-delay-compensated configuration with two gratings, applied to free-electron lasers.

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The monochromator beamline at FLASH: performance, capabilities and upgrade plans

Cited by 61 publications

References 12 publications

A non-invasive online photoionization spectrometer for FLASH2

A non-invasive online photoionization spectrometer for FLASH2

FLASH free-electron laser single-shot temporal diagnostic: terahertz-field-driven streaking

Grating Configurations for the Spectral Selection of Coherent Ultrashort Pulses in the Extreme-Ultraviolet

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