Abstract
As part of the R program of the LCLS-II project, a novel 3.4-meter-long undulator prototype with horizontal magnetic field and dynamic force compensation has recently been developed at the Advanced Photon Source (APS). Previous steps in this development were the shorter 0.8-meter-long and 2.8-meter-long prototypes. Extensive mechanical and magnetic testing were carried out for each prototype, and each prototype was magnetically tuned using magnetic shims. The resulting performance of the 3.4-meter-long undulator prototype meets all requirements for the LCLS-II insertion device, including limits on the field integrals, phase errors, higher-order magnetic moments, and electron-beam trajectory for all operational gaps, as well as the reproducibility and accuracy of the gap settings.
Highlights
Undulators are critical components of synchrotron radiation (SR) sources and free electron lasers (FEL)
As part of the R&D program of the LCLS-II project, a novel 3.4-meter-long undulator prototype with horizontal magnetic field and dynamic force compensation has recently been developed at the Advanced Photon Source (APS)
The resulting performance of the 3.4-meter-long undulator prototype meets all requirements for the LCLS-II insertion device, including limits on the field integrals, phase errors, higher-order magnetic moments, and electron-beam trajectory for all operational gaps, as well as the reproducibility and accuracy of the gap settings
Summary
Undulators are critical components of synchrotron radiation (SR) sources and free electron lasers (FEL). APPLE-type IDs for its soft x-ray FEL with their own drive mechanism All of these devices have a vertical main magnetic field and the massive strongbacks that hold the magnetic structures are usually quite tall. A novel ID recently developed by the APS for the LCLS-II project uses a magnetic force compensation system [15] based on custom-designed conical springs Such an approach resulted in a significant reduction of the ID volume, simplification of the strongback design and fabrication, and the reorientation of the x-ray polarization plane into the vertical direction. The magnetic measurements of the undulator effective field demonstrated that the magnetic gap within the operating range was controlled accurately and reproducibly within Æ1 μm Successful tests of this ID prototype led to the design of a 3.4-m-long device with 260 poles per jaw based on the same concept. This paper describes the main features and mechanical and magnetic performance of this novel undulator
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
