A. Schöps
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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: 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: Development of cryogenically cooled permanent magnet undulators for PETRA IV
Development of cryogenically cooled permanent magnet undulators for PETRA IV Open
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 t…
P21.1 at PETRA III – a high-energy X-ray diffraction beamline for physics and chemistry Open
Beamline P21.1 at PETRA III uses high-energy photons for the investigation of materials structure by diffraction methods. The instrumentation is particularly suited for probing ordering phenomena on a local scale in chemistry and physics. …
View article: Commissioning experience with two in-vacuum undulators at PETRA III
Commissioning experience with two in-vacuum undulators at PETRA III Open
In 2018 the high energy X-ray beamlines P07[1] and P21b[2] at DESY’s storage ring PETRA III received new undulators. The two identical devices were built by an industry collaboration of Research Instruments GmbH and Kyma S.p.A. according t…
View article: Control system for a variable period undulator prototype
Control system for a variable period undulator prototype Open
The magnetic structure of the proposed variable period undulator consists of cylindrical magnets. Each magnet can be rotated by a small stepper motor, in order to adjust the magnetic field and form an arbitrarily shaped magnetic field prof…
View article: A Laser Heater Undulator for FLASH2020+
A Laser Heater Undulator for FLASH2020+ Open
Space charge induced micro bunch instabilities, amplified in cascaded bunch compression stages, spoil the phase space of compressed bunches and lead to unstable seeding. To “heat” up the bunch with an external laser and induce an uncorrela…
View article: Development of cryogenic undulators and measurement equipment for PETRA IV
Development of cryogenic undulators and measurement equipment for PETRA IV Open
DESY is planning to upgrade its current storage ring PETRA III into the ultra-low emittance photon source PETRA IV. The current H6BA cell design for the PETRA IV lattice will allow for insertion devices of up to 4 m length in the standard …
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: An adaptive scheme for suppression of higher harmonics in an undulator
An adaptive scheme for suppression of higher harmonics in an undulator Open
An undulator usually emits radiation at the energy of the fundamental wavelength and the higher harmonics at the same time. Likewise, monochromators with gratings or low-indexed crystals also transmit these higher harmonics with substantia…
View article: Refurbishment of radiation-damaged undulators
Refurbishment of radiation-damaged undulators Open
Partial radiation damage has been observed over the previous five years of operation for a few of the PETRA III permanent magnet undulators at DESY. The degradation of the affected devices has been observed by a change in the energy tuning…
View article: Properties of the insertion devices for PETRA III and its extension
Properties of the insertion devices for PETRA III and its extension Open
DESY presently operates 14 independent insertion device (ID) beamlines at its 6 GeV storage ring PETRA III. Besides the 2 m long standard undulators U29 and U32, several special IDs of up to 5 m length have been installed to meet the exper…