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Phasing multi-segment undulators.

J Chavanne, P Van Vaerenbergh, P Elleaume

    Journal of Synchrotron Radiation
    |May 1, 1996
    PubMed
    Summary
    This summary is machine-generated.

    A new passive permanent magnet phasing section improves multi-segment undulator construction for synchrotron radiation and free-electron lasers (FELs). This method enhances mechanical independence and positioning tolerance, maintaining spectral quality.

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    Area of Science:

    • Physics
    • Engineering

    Background:

    • Manufacturing multi-segment undulators for synchrotron radiation and free-electron lasers (FELs) faces challenges in phasing successive segments.
    • Current phasing methods can be complex and require active current control.

    Purpose of the Study:

    • To present a novel, passive permanent magnet phasing section for multi-segment undulators.
    • To evaluate the impact of this new phasing section on mechanical independence, positioning tolerance, and spectral properties.

    Main Methods:

    • A pure permanent magnet phasing section was designed and implemented.
    • The section introduces a 6 mm longitudinal gap between undulator segments.
    • Magnetic interactions and spectral performance were analyzed and compared to conventional methods.

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    Main Results:

    • The novel phasing section provides complete mechanical independence between segments.
    • It reduces the tolerance for longitudinal positioning by a factor of 2.8 compared to conventional phasing.
    • The spectrum and useful harmonics remain largely unchanged across various gap sizes.

    Conclusions:

    • The passive permanent magnet phasing section offers a significant improvement for multi-segment undulator fabrication.
    • It enhances precision and simplifies construction without compromising performance.
    • This innovation is crucial for advancing synchrotron radiation sources and FELs.