# International Workshop on Fixed Field alternating gradient Accelerators (FFA’19)

19-22 November 2019
TimeOut
Europe/Zurich timezone

## Permanent Magnet VFFA for 18GeV Electron Acceleration

19 Nov 2019, 17:30
45m
WBGB/019 (TimeOut)

### WBGB/019

#### TimeOut

Paul Scherrer Institute Forschungsstrasse 111 CH-5232 Villigen PSI Switzerland

### Speaker

Stephen Brooks (BNL)

### Description

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.