Development of Advanced Magnet Structures for Cryogenic In Vacuum Permanent Magnet Undulators

Short period undulators and in particular in vacuum cryogenic permanent magnet undulators are the upcoming technique for FEL radiators, because they permit a significant reduction of linac and undulator length. For achieving high photon energies with low electron energies short period lengths, e.g. below lOmm permanent magnet structures are superior, due to their high surface current density of 16 kA cm as compared to electromagnetic or even superconducting devices. The geom.etrical to1erances scale with the period length. This requires new fabrication techniques and structure designs, particularly for sub cm period lengths. Salutions for these demands will be presented and results from a first prototype using various new technologies such as compound poles will be discussed and compared with common approache

Hall Probe Bench for Cryogenic In Vacuum Undulator

The Helmholtz Zentrum Berlin HZB builds a 2m long in vacuum Hall probe measuring bench for the characterization of several in vacuum cryogenic undulators currently under development. Aceurate local magnetic measurements need a positioning control of about 5 Jlll. Fabrication tolerances and potentially strong temperature gradients require an active correction of the Hall probe movement along a straight line. The HZBbench employs a system of Iaser interferometers and positionsensitive detectors, which are used in a feed back loop for the Hall probe position and orientatio

Development of a cryogenic APPLE CPMUE15 at BESSY II

Building on the innovative design of the In Vacuum APPLE IVUE32, a design for a 15mm period cryogenic elliptical undulator CPMUE15 is proposed. The undulator is to be developed under the ATHENA collaboration. Initially designed to provide a radiator for the SINBAD facility at DESY, a comparison is made for a design to provide an Afterburner device for FLASH

SHIMMING OF THE DYNAMIC FIELD INTEGRALS OF THE BESSY II U125 HYBRID UNDULATOR

Abstract Within a continuous program the BESSY II undulators are prepared for Topping-Up operation. The U125 planar hybrid undulator has a period length of 125 mm and a pole width of only 60 mm. The horizontal defocusing of the 1.7 GeV e-beam may result in a significant reduction of the horizontal dynamic aperture, reducing the injection efficiency when injecting into the closed gap. The dynamic field integrals are derived from a 2D-Fourier decomposition of the 3D-field. An analytic description of the dynamic field integrals based on the Fourier coefficients is presented. Magic fingers have been installed in order to minimize the dynamic field integrals and to enlarge the good field region of the device

Cryogenic Design of a PrFeB Based Undulator

A PrFeB based cryogenic undulator has been built at Helmholtz Zentrum Berlin HZB in collaboration with the Ludwig Maximilian University München LMU . LMU will operate the undulator at a laser plasma accelerator at the Max Planck Institut für Quantenoptik in Garching. The 20 period device has a period length of 9mm and a fixed gap of 2.5mm. The operation of a small gap device at a high emittance electron beam requires stable magnetic material. A high coercivity is achieved with PrFeB material cooled down to 20 30K. In this paper we present the mechanic, magnetic and cryogenic design and compare predictions with measured dat

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High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies

Concepts and technical realization of the high-resolution soft X-ray beamline ADRESS at the Swiss Light Source are described. Optimization of the optical scheme for high resolution and photon flux as well as diagnostics tools and alignment strategies are discussed

EMIL The energy materials in situ laboratory Berlin a novel characterization facility for photovoltaic and energy materials

A knowledge based approach towards developing a new generation of solar energy conversion devices requires a fast and direct feedback between sophisticated analytics and state of the art processing test facilities for all relevant material classes. A promising approach is the coupling of synchrotron based X ray characterization techniques, providing the unique possibility to map the electronic and chemical structure of thin layers and interface regions with relevant in system in situ sample preparation or in operando analysis capabilities in one dedicated laboratory. EMIL, the Energy Materials In situ Laboratory Berlin, is a unique facility at the BESSY II synchrotron light source. EMIL will be dedicated to the in system, in situ, and in operando X ray analysis of materials and devices for energy conversion and energy storage technologies including photovoltaic applications and photo electrochemical processes. EMIL comprises up to five experimental end stations, three of them can access X rays in an energy range of 80 eV 10 keV. For example, one key setup of EMIL combines a suite of advanced spectroscopic characterization tools with industry relevant deposition facilities in one integrated ultra high vacuum system. These deposition tools allow the growth of PV devices based on silicon, compound semiconductors, hybrid heterojunctions, and organo metal halide perovskites on up to 6 sized substrates. EMIL will serve as a research platform for national and international collaboration in the field of photovoltaic photocatalytic energy conversion and beyond. In this paper, we will provide an overview of the analytic and material capabilities at EMIL

The status of the in vacuum APPLE II IVUE32 at HZB BESSY II

At BESSY II, two new beamlines for RIXS and for X Ray microscopy need a short period variably polarizing undulator. For this purpose, the first in vacuum APPLE II undulator worldwide is under construction. The parameters are as follows period length amp; 955;0 32 mm, periods 78, minimum gap 7mm. The design incorporates a force compensation scheme as proposed by two of the authors at the SRI 2018. All precision parts of the drive chain are located in air. New transverse slides for the transversal slit adjustment have been developed and tested. Optical Micrometers measure the gap and phase positions, similar to the system of the CPMU17 at BESSY II. They provide the signals for motor feedback loops. A new UHV compatible soldering technique, as developed with industry, relaxes fabrication tolerances of magnets and magnet holders and simplifies the magnet assembly. A 10 period prototype has been setup for lifetime tests of the new magnetic keeper design. The paper summarizes the status of the undulator IVUE3