Phasing Magnet for CSX-2 Beamline at NSLS-II

• Published in: IEEE transactions on applied superconductivity Vol. 32; no. 6; pp. 1 - 4
• Main Authors: Musardo, M., Tanabe, T., Rank, J., Harder, D., Corwin, T., Rhein, C.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coherent scattering; Electron beams; Field strength; Light sources; Magnetic cores; Magnetic field measurement; Magnetic flux; Magnetic levitation; Magnetic measurement; Magnetic noise; Magnetic shielding; MATERIALS SCIENCE; Permanent magnets; Phase matching; Photon beams; Polarization; Soft x rays; Superconducting magnets; synchrotron light source; synchrotron radiation; Synchrotrons; Undulator; X-ray scattering
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2022.3155502

A phasing magnet has been developed at National Synchrotron Light Source II (NSLS-II) for the Coherent Soft X-ray Scattering (CSX) beamline. The phasing magnet will be located at the center of the straight section in between two identical and independent variably polarized APPLE-II devices. Based on Permanent Magnet technology, the phasing magnet has been designed to achieve the required electron beam delay to properly adjust the phase matching of these two consecutive EPUs (Elliptically Polarizing Undulators) and ensure a positive interference between the photon beam emitted in each device. This paper will describe the mechanical and magnetic design together with the final field measurements and magnetic tuning results. Also, the spectral performance of the two EPUs and the method used to properly set the field strength of the phasing magnet for any given radiation wavelength and polarization mode will be presented as well.