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View article: Design Studies of Damping Wigglers for PETRA IV at DESY
Design Studies of Damping Wigglers for PETRA IV at DESY Open
DESY plans to upgrade the present PETRA III facility into a high-resolution 3D X-ray microscope for chemical and physical processes - the future project PETRA IV. The highest spatial resolution for all X-ray techniques will be ensured by f…
View article: Construction and commissioning of an APPLE-III afterburner undulator as a prototype for radiators in the new seeding line of FLASH2020+
Construction and commissioning of an APPLE-III afterburner undulator as a prototype for radiators in the new seeding line of FLASH2020+ Open
An APPLE-III undulator with 17.5 mm period length operating at a minimum magnetic gap of 8 mm was installed downstream of the FLASH2 SASE undulators. This device serves as an afterburner and was designed to provide arbitrarily (also circul…
View article: Corrector coils with variable field direction for FLASH 2020
Corrector coils with variable field direction for FLASH 2020 Open
Despite thorough tuning of insertion devices for storage rings or linear accelerators, a (usually gap dependent) kick to the electron beam remains and has to be corrected with the help of steerer coils. These small, resistive coils are pla…
View article: Set-up and characterisation of a permanent magnet-based phase shifter series for FLASH2020
Set-up and characterisation of a permanent magnet-based phase shifter series for FLASH2020 Open
A compact, permanent magnet-based phase shifter was developed for the upgrade of the free-electron laser FLASH at DESY Hamburg. One phase shifter will be positioned in each of the ten intersections between two radiator undulators and will …
View article: First high peak and average power single-pass THz free-electron laser in operation
First high peak and average power single-pass THz free-electron laser in operation Open
We report on the operation of the first high peak and average power single-pass terahertz free-electron laser (THz FEL) based on a high-brightness photoinjector for developing a THz source for pump-probe experiments at advanced x-ray FELs …
View article: Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control
Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control Open
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of photon energies. Their revolutionary and innovati…
View article: Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control
Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control Open
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of accessible photon energies. Their revolutionary a…
View article: First high peak and average power THz SASE FEL in operation
First high peak and average power THz SASE FEL in operation Open
Advanced experiments using THz pump and X-ray probe pulses at modern free-electron lasers (FELs) like the European X-ray FEL require a frequency-tunable (from 0.1 THz to 30 THz), high-power (> 10 microjoule), narrow-band (~ 1–2%) THz sourc…
View article: Magnet Design for the PETRA IV Storage Ring
Magnet Design for the PETRA IV Storage Ring Open
The proposed PETRA IV electron storage ring that will replace DESY¿s flagship synchrotron light source PETRA III will feature a horizontal emittance as low as 20 pmrad. It is based on a hybrid six-bend achromat lattice. In addition to the …
View article: Flexible and Coherent Soft X-ray Pulses at High Repetition Rate: Current Research and Perspectives
Flexible and Coherent Soft X-ray Pulses at High Repetition Rate: Current Research and Perspectives Open
The successful realization of high gain free-electron lasers has opened new possibilities to X-ray scientists for investigating matter in different states. The availability of unprecedented photon properties stimulated the development of n…
View article: FLASH2020+ Plans for a New Coherent Source at DESY
FLASH2020+ Plans for a New Coherent Source at DESY Open
With FLASH2020+, a major upgrade of the FLASH facility has started to meet the new requirements of the growing soft-x ray user community. The design of the FEL beamlines aims at photon properties suitable to the needs of future user experi…
View article: Modeling the Magnetic Field of the LCLS-I Undulator for THz@PITZ
Modeling the Magnetic Field of the LCLS-I Undulator for THz@PITZ Open
An accelerator-based THz source for pump-probe experiments at the European XFEL is under development at the Photo Injector Test Facility at DESY in Zeuthen (PITZ). For the proof-of-principle experiments an LCLS-I undulator is planned to be…
View article: Magnetic Tuning and Installation Modifications of U48 Undulator for the Delhi Light Source (DLS)
Magnetic Tuning and Installation Modifications of U48 Undulator for the Delhi Light Source (DLS) Open
A compact THz radiation facility based on the principle of a pre-bunched Free Electron Laser, called Delhi Light Source (DLS) is at the final stage of commissioning at IUAC, New Delhi, India. For generation of THz radiation in DLS, an undu…
View article: Layout of the Laser Heater for FLASH2020+
Layout of the Laser Heater for FLASH2020+ Open
The major upgrade FLASH2020+ of the FEL user facility FLASH includes an improved injector layout for the generation of the high-brightness electron beam as well as an externally seeded FEL beamline. Microbunching gain of initial modulation…
View article: IRIXS: a resonant inelastic X-ray scattering instrument dedicated to X-rays in the intermediate energy range
IRIXS: a resonant inelastic X-ray scattering instrument dedicated to X-rays in the intermediate energy range Open
A new resonant inelastic X-ray scattering (RIXS) instrument has been constructed at beamline P01 of the PETRA III synchrotron. This instrument has been named IRIXS (intermediate X-ray energy RIXS) and is dedicated to X-rays in the tender-e…
View article: Design status of the ultra-low emittance synchrotron facility PETRA IV
Design status of the ultra-low emittance synchrotron facility PETRA IV Open
At DESY the Synchrotron Light Source PETRA III offers scientists outstanding opportunities for experiments with hard X-rays of exceptionally high brilliance since 2009. Research activities have been started to upgrade PETRA III to the ultr…
View article: Status of the PETRA IV project
Status of the PETRA IV project Open
Since 2016 DESY has been pursuing R towards upgrading its PETRA synchrotron light source to a fourth-generation machine, PETRA IV, which is expected to start operation in 2027. The conceptual design of a 6 GeV seven-bend-achromat-based lat…
View article: Variable period undulator with tunable polarization
Variable period undulator with tunable polarization Open
The proposed magnetic structure allows to control all the parameters of the sinusoidal magnetic field B(s)=B0·sin(2πs/λU+ϕ) of permanent magnet undulator: amplitude B0, period length λU, and phase ϕ. The magnetic structure consists of diam…
View article: A Concept for Upgrade of FLASH2 Undulator Line
A Concept for Upgrade of FLASH2 Undulator Line Open
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. There are plans to upgrade both existing undulator lines of this facility, FLASH1 and FLASH2. FLASH1 will mainly operate in X…
View article: PETRA IV: the ultralow-emittance source project at DESY
PETRA IV: the ultralow-emittance source project at DESY Open
The PETRA IV project aims at upgrading the present synchrotron radiation source PETRA III at DESY into an ultralow-emittance source. Being diffraction limited up to X-rays of about 10 keV, PETRA IV will be ideal for three-dimensional X-ray…
View article: Harmonic Lasing in X-Ray FELs: Theory and Experiment
Harmonic Lasing in X-Ray FELs: Theory and Experiment Open
Harmonic lasing in XFELs is an opportunity to extend operating range of existing and planned X-ray FEL user facilities*. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-band FEL …
View article: The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives
The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives Open
Since 2016, the two free-electron laser (FEL) lines FLASH1 and FLASH2 have been run simultaneously for users at DESY in Hamburg. With the installation of variable gap undulators in the new FLASH2 FEL line, many new possibilities have opene…
View article: First Operation of a Harmonic Lasing Self-Seeded FEL
First Operation of a Harmonic Lasing Self-Seeded FEL Open
Harmonic lasing is a perspective mode of operation of X-ray FEL user facilities that allows to provide brilliant beams of higher energy photons for user experiments. Another useful application of harmonic lasing is so called Harmonic Lasin…
View article: Characterisation of the surface of freshly prepared precious metal catalysts
Characterisation of the surface of freshly prepared precious metal catalysts Open
Freshly prepared precious metal catalysts have been investigated by electron microscopy, X-ray and neutron spectroscopies and computational methods. At least half the surface is metallic with the remainder covered by oxygen, largely as hyd…