Markus Tischer

Operation of the variable polarization undulator on the third harmonic of a SASE FEL

Juliane Roensch-Schulenburg, Markus Braune, Günter Brenner, Siarhei Dziarzhytski et autres

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Corrector coils with variable field direction for FLASH 2020

K. Götze, Pavel Vagin, Paul Neumann, Sumera Yamin et autres

Abstract 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 placed upstream and …

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Design Studies of Damping Wigglers for PETRA IV at DESY

Sumera Yamin, Markus Tischer, Pavel Vagin

Abstract 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 focusing the synchrotron …

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Construction and commissioning of an APPLE-III afterburner undulator as a prototype for radiators in the new seeding line of FLASH2020+

Markus Tischer, Hilmar Bienert, K. Götze, Paul Neumann et autres

Abstract 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 circularly) polarized light …

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Set-up and characterisation of a permanent magnet-based phase shifter series for FLASH2020

K. Götze, Pavel Vagin, Paul Neumann, Sayali Telawane et autres

Abstract 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 allow for a tuning …

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First high peak and average power single-pass THz free-electron laser in operation

M. Krasilnikov, Zakaria Aboulbanine, Gowri Adhikari, Namra Aftab et autres

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 (XFELs). Electron beams with 17 MeV …

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Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control

Markus Ilchen, E. Allaria, Primož Rebernik Ribič, H.-D. Nuhn et autres

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 innovative developments have opened new fields of science regarding nonlinear …

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Set-up, characterization and mitigation of cross-talk between PM-based and ferrite-enforced appliances for FLASH 2020

K. Götze, Pavel Vagin, Paul Neumann, Sayali Telawane et autres

We present the design basics, assembly procedure and the results of the characterization measurements for two magnetic appliances that are part of the current upgrade of the FLASH free electron laser at DESY Hamburg. A permanent magnet-based phase shifter will allow for …

Operation of the variable polarization undulator on the third harmonic of a SASE FEL

Juliane Rönsch-Schulenburg, Markus Braune, Markus Tischer, Pavel Vagin et autres

FLASH is a XUV and soft X-ray free-electron laser and operates as a user facility since 2005. It comprises asuperconducting LINAC with a beam energy of up to 1.35 GeV which serves two FEL beamlines in parallel:FLASH1 and FLASH2. The FLASH2 main …

Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control

Markus Ilchen, E. Allaria, Primož Rebernik Ribič, H.-D. Nuhn et autres

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 and innovative developments have opened new fields of science regarding …

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First high peak and average power THz SASE FEL in operation

M. Krasilnikov, Zakaria Aboulbanine, Gowri Adhikari, Namra Aftab et autres

Abstract 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 source maintaining the repetition rate …

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The synchrotron radiation source PETRA III and its future ultra-low-emittance upgrade PETRA IV

Christian G. Schroer, Hans‐Christian Wille, Oliver H. Seeck, Kai Bagschik et autres

Abstract PETRA III at DESY is one of the brightest synchrotron radiation sources worldwide. It serves a broad international multidisciplinary user community from academia to industry at currently 25 specialised beamlines. With a storage-ring energy of 6 GeV, it provides mainly hard …

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