Pavel Vagin

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

de (code pays fourni par la source)

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 …

de (code pays fourni par la source)

Progress in Design of Permanent Magnet Dipole-Quadrupoles with Longitudinal Gradient for the PETRA IV Storage Ring

Mona Gehlot, Torsten Ramm, Matthias Tischer, Pavel Vagin et autres

Abstract PETRA IV is an upgrade project planned to replace the Synchrotron light source PETRA III. The main objective is to reduce the horizontal emittance to 20 pmrad. This nominal emittance will be achieved by a hybrid six bend achromat lattice(H6BA). To …

fr (code pays fourni par la source)

Development of cryogenically cooled permanent magnet undulators for PETRA IV

H Bolat, A. Schöps, Matthias Tischer, Maximilian Trunk et autres

Abstract Cryogenically cooled permanent magnet undulators (CPMUs) are an improvement of the in-vacuum undulators (IVUs) which are widely used at various synchrotron radiation facilities and free-electron lasers in order to improve the photon flux towards shorter wavelengths. Especially beamlines with the need …

de (code pays fourni par la source)

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 …

de (code pays fourni par la source)

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 …

de, us (code pays fourni par la source)

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 …

de (code pays fourni par la source)

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 …

First high peak and average power single-pass THz FEL based on high brightness photoinjector

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

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, high-power, narrow-band THz source maintaining the repetition rate and pulse structure of the X-ray pulses. This paper reports the first …

Differential method for measuring periodic magnetic structure

G. V. Yakopov, Pavel Vagin

The improvement of accelerator parameters requires the transition to superconducting undulator technologies since SCUs allow higher magnetic fields compared to classical planar undulators with the same gap. The primary method for characterizing magnetic structures is to measure the magnetic field distribution along …