M. Tischer
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View article: Progress in Design of Permanent Magnet Dipole-Quadrupoles with Longitudinal Gradient for the PETRA IV Storage Ring
Progress in Design of Permanent Magnet Dipole-Quadrupoles with Longitudinal Gradient for the PETRA IV Storage Ring Open
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(H…
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…
View article: Permanent Magnet phase shifters for FLASH2020+ FEL
Permanent Magnet phase shifters for FLASH2020+ FEL Open
The development of a simple and compact permanent magnet (PM) phase shifter is presented in this paper. The design is based on four PM blocks per girder (8 PM blocks in total), and uses only one type PM block with horizontal magnetization …
View article: Photon Diagnostic for FLASH2020+: Analysis of Spontaneous Radiation for Undulator Alignment
Photon Diagnostic for FLASH2020+: Analysis of Spontaneous Radiation for Undulator Alignment Open
Within the FLASH2020+ program, DESY is aiming to significantly improve the flexibility and availability of its pioneering FEL FLASH for users. Increasing the electron beam energy to 1.35GeV will make wavelengths available up to the oxygen …
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: 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: Progress of Delhi Light Source at IUAC, New Delhi
Progress of Delhi Light Source at IUAC, New Delhi Open
The first phase of the pre-bunched FEL based on the Photoinjector RF electron gun, known as Delhi Light Source (DLS),* has been planned at Inter University Accelerator Centre (IUAC), New Delhi. The electron gun made from OFHC copper had al…
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…