Author: Kusche, K.
Paper Title Page
MOPAB139 High Resolution Imaging Design Using Permanent Magnet Quadrupoles at BNL UEM 485
 
  • G. Andonian, T.J. Campese, I.I. Gadjev, M. Ruelas
    RadiaBeam, Santa Monica, California, USA
  • M.G. Fedurin, K. Kusche, X. Yang, Y. Zhu
    BNL, Upton, New York, USA
  • C.C. Hall
    RadiaSoft LLC, Boulder, Colorado, USA
  
  Ul­tra­fast elec­tron mi­croscopy tech­niques have demon­strated the po­ten­tial to reach very high com­bined spa­tio-tem­po­ral res­o­lu­tion. In order to achieve high res­o­lu­tion, strong fo­cus­ing mag­nets must be used as the ob­jec­tive and pro­jec­tor lenses. In this paper, we dis­cuss the de­sign and de­vel­op­ment of a high-res­o­lu­tion ob­jec­tive lens for use in the BNL UEM. The ob­jec­tive lens is a quin­tu­plet array of per­ma­nent mag­net quadrupoles, which in sum, pro­vide sym­met­ric fo­cus­ing, high mag­ni­fi­ca­tion, and con­trol of higher order aber­ra­tion terms. The ap­pli­ca­tion and de­sign for a proof-of-con­cept ex­per­i­ment using a cal­i­brated slit for imag­ing are pre­sented. The image res­o­lu­tion is mon­i­tored as a func­tion of beam pa­ra­me­ters (en­ergy, en­ergy spread, charge, bunch length, spot size), and quin­tu­plet lens pa­ra­me­ters (drifts be­tween lenses).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB139  
About • paper received ※ 26 May 2021       paper accepted ※ 28 May 2021       issue date ※ 18 August 2021  
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