Permanent Magnet VFFA for 18GeV Electron Acceleration

Nov 19, 2019, 5:30 PM
WBGB/019 (TimeOut)



Paul Scherrer Institute Forschungsstrasse 111 CH-5232 Villigen PSI Switzerland


Stephen Brooks (BNL)


Fixed-field accelerators with vertical orbit excursion (VFFAs) have the interesting property that the matched beam orbit shape, circumference and optics stay constant with beam momentum. This requires magnets with a vertically exponential field $B_y=B_0 e^{ky}$ on the $x=0$ midplane. This paper presents prototype measurements of such a magnet, along with a lattice using similar magnets that would allow acceleration of electrons to 18GeV in the RHIC tunnel. The lattice uses a high phase advance cell in order to give better magnetic efficiency while still being essentially a "scaling" FFA.

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