Development of a 10-meter wedged-pole undulator

Quimby, D.C.; Gottschalk, S.C.; James, Foster; Robinson, K.; Slater, J.; Valla, A.

doi:10.1016/0168-9002(89)90466-x

Cited by 46 publications

(9 citation statements)

References 8 publications

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“…Shimming procedure is accomplished with various methods: Local field errors are compensated with soft iron sheets or permanent magnets placed on top of the structure (Quimby et al 1989;Gottschalk et al 1990;Chavanne and Elleaume 1995b;Diviacco and Walker 1996) or with a transverse displacement of magnets, so-called virtual shimming (Bahrdt et al 2004b). Another efficient method is a pole height adjustment which is used for the in-air European XFEL undulators (Pflüger et al 1999).…”

Section: Sorting and Shimming Of Permanent Magnet Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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Periodic magnetic structures, i.e., undulators and wigglers, have been used for nearly 40 years as sources of brilliant synchrotron radiation. Today, sophisticated undulator designs provide many degrees of freedom such as photon beam energy, variable polarization, and orbital angular momentum. Specific designs efficiently suppress higher orders or reduce the on-axis power density. All tuning parameters are required to be freely accessible by the users. Still, the majority of undulators is based on permanent magnets with a clear trend to short periods and in-vacuum and cryogenically cooled systems. Similar designs are used for storage rings and free electron lasers, though the field quality requirements are different. Today, the optimization of a specific experiment follows a global approach. This includes not only the undulator design itself but also local lattice modifications to cope with ambitious designs, elaborate tracking schemes to estimate the impact on the dynamic aperture, and last but not least radiation propagation tools which transport a realistic photon beam phase space to the sample. This chapter summarizes the theory of undulator radiation and reviews the technological realization of undulators and wigglers. Operational issues are discussed, as well.

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Section: Sorting and Shimming Of Permanent Magnet Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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“…Shimming is widely used for tuning insertion devices [11][12][13][14][15]. A qualitative understanding of their working principle is essential.…”

Section: Magnetic Moment In Shimsmentioning

confidence: 99%

Tuning method for phase shifters with very low first field integral errors for the European X-ray Free Electron Laser

Pflueger

2015

Phys. Rev. ST Accel. Beams

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For the long gap tunable undulator systems of the European XFEL, 91 phase shifters are needed. They need to fulfil stringent and demanding field integral tolerances if their strengths, i.e., their magnetic gaps, are changed. In order to avoid additional correctors, their first field integral errors must not exceed AE0.004 Tmm for self-amplified spontaneous emission operation at 1 Å. For longer wavelengths there are slightly relaxed requirements. In addition, a good field range of AE0.5 mm is required. Phase shifters are manufactured by using state of the art techniques such as measurement and sorting of magnets, measurement and sorting of subassemblies, etc. In spite of these efforts, inhomogeneities of the permanent magnet material as well as mechanic manufacturing errors, which cannot be avoided and lead to violations of the demanding first field integral specifications. Therefore, a fast and robust shimming technique was developed for the serial production of these devices. It is based on measured signatures of shims with different geometries and uses symmetry properties of shims placed on different positions and poles with different polarity. In this paper, the specifications for the phase shifters in the European XFEL are derived first. Then the method is described in detail and results are presented, which demonstrate that all requirements can be fulfilled.

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“…The issues associated with long undulators were first explored in the context of high power FEL oscillators and amplifiers [33,34]. Issues identified in that context remain significant concerns.…”

Section: Specialty Devicesmentioning

confidence: 99%

Overview of hot topics in insertion device design

Robinson

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Emphasis in insertion devices (undulators and wigglers) is evolving. Conventional designs account for the majority of devices in use as synchrotron radiation (SR) or freeelectron laser (FEL) sources, but more is being demanded with each succeeding application. Totally passive field compensation, gap independence, and the perfecting of phase and spectral properties are areas of major interest. However, the shift toward specialty designs is increasingly important. Designs are tailored to achieve specific radiation characteristics. These range from SR sources with time-dependent polarization capabilities to long devices optimized for FEL operation in the X-ray regime. Strong focusing and other beam dynamics related characteristics are becoming extremely important for the next generation of FEL devices. As electron beam quality continues to increase, small-gap, small period, and unconventional field profiles are becoming necessary for compact sources. These areas of increased interest are examined.

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Development of a 10-meter wedged-pole undulator

Cited by 46 publications

References 8 publications

Shaping Photon Beams with Undulators and Wigglers

Shaping Photon Beams with Undulators and Wigglers

Tuning method for phase shifters with very low first field integral errors for the European X-ray Free Electron Laser

Overview of hot topics in insertion device design

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