Author: Kerby, J.S.
Paper Title Page
THPAB050 Compact Hybrid Planar Permanent Magnet Undulator Design for the APS Upgrade 3859
 
  • M. Abliz, M. Borland, J.H. Grimmer, J.S. Kerby, M. Ramanathan, A. Xiao
    ANL, Lemont, Illinois, USA
 
  We report on the successful design of a compact 28-mm period hybrid planar permanent magnet (HPPM) undulator for the Advanced Photon Source Upgrade (APS-U) project. The design produces a peak field of 9750 G at a gap of 8.5 mm, with a pole width reduced to 35 mm as compared to the planar undulators currently in use at the Advanced Photon Source. The design includes a detailed investigation into the origin of the HPPM undulator demagnetization. We report on a finding of an optimization method that reduces the demagnetization field and increases the field at the gap center of the design. It includes an optimization of the pole edges to increase the field and decrease roll-off in the transverse direction. Further design optimizations include analyses of the mechanical assembly tolerances and comparison with the original design before building the device. Beam physics analyses included kick-map analysis, dynamic acceptance (DA), local momentum acceptance (LMA), and Touschek lifetime of this design were performed with the 42-pm lattice of the APS-U. Detailed magnetic design, effective field, field roll-off, magnetic force, and tracking results are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB050  
About • paper received ※ 14 May 2021       paper accepted ※ 01 September 2021       issue date ※ 21 August 2021  
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THPAB051 Vertical Septum Magnet Design for the APS Upgrade 3862
 
  • M. Abliz, M. Borland, H. Cease, G. Decker, A.K. Jain, M.S. Jaski, M. Kasa, J.S. Kerby, U. Wienands, A. Xiao
    ANL, Lemont, Illinois, USA
  • J.W. Amann
    SLAC, Menlo Park, California, USA
  • D.J. Harding
    Fermilab, Batavia, Illinois, USA
 
  The vertical injection scheme proposed for the APS Upgrade (APS-U) Project requires a challenging septum magnet that must meet stringent beam physics, magnetic field leakage, and vacuum requirements. The current iteration of this magnet design includes an enlarged stored-beam chamber aperture of 9 mm x 12 mm and a reduction of the septum thickness to 1.5 mm. The enlarged aperture accommodates a non-evaporable getter (NEG)-coated stored beam chamber to better achieve the required vacuum. A prototype septum magnet has been built and measurements confirm the cancellation of a peak leakage field even though the value is six times larger than the design. The leakage field measured at the upstream (US) end cancels the downstream (DS) end as was expected by design. The measured and simulated leakage field and the stored beam trajectories are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB051  
About • paper received ※ 14 May 2021       paper accepted ※ 01 September 2021       issue date ※ 27 August 2021  
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