Development trends for insertion devices of future synchrotron light sources

The in-vacuum undulator with a permanent magnet at room temperature is a mature technology and is widely used; with a short period length in a medium-energy facility, it can enhance photon brilliance in the hard x-ray region. A cryogenic permanent magnet has been investigated as an in-vacuum undulat...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2011-04, Vol.14 (4), p.044801, Article 044801
Main Authors: Hwang, C. S., Jan, J. C., Chang, C. S., Chen, S. D., Chang, C. H., Uen, T. M.
Format: Article
Language:English
Subjects:
Algorithms
Free electrons
High temperature
Insertion
Light sources
Permanent magnets
Photons
Room temperature
Superconductivity
Synchrotron radiation
Synchrotrons
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Summary:The in-vacuum undulator with a permanent magnet at room temperature is a mature technology and is widely used; with a short period length in a medium-energy facility, it can enhance photon brilliance in the hard x-ray region. A cryogenic permanent magnet has been investigated as an in-vacuum undulator; this undulator will become the best prospective device to satisfy the requirements of a photon source with great brilliance in the hard x-ray region. For the further hard x-ray region, a superconducting wiggler can provide great flux with a continuous spectrum, whereas a superconducting undulator will provide great brilliance with a discrete spectrum. High-temperature superconducting wires are highly promising for use in the development of superconducting undulators; unique algorithms for their development with an extremely short period in a small-magnet gap have been devised. Some out-of-vacuum planar undulators with special functions must also be fabricated to enable diverse applications in various light-source facilities. This article describes current and future developments for insertion devices in storage-ring and free-electron-laser facilities and discusses their feasibility for use therein.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.14.044801