Physics – Accelerator Physics
Scientific paper
2000-10-02
eConf C00082 (2000) TUc08
Physics
Accelerator Physics
3 pages, 8 figures, LINAC 2000, TUC08
Scientific paper
Here we present designs for a static septum magnet with two adjacent apertures where ideally one aperture has a uniform dipole field and the other zero field. Two designs are considered. One is a true septum magnet with a thin layer of coils and materials separating the dipole field region from the null field region. During the beam switching process, the intense electron beam will spray across this material septum leading to concerns on beam control, vacuum quality, radiation damage, etc. due to the lost particles. Therefore, another configuration without a material septum is also considered. With this configuration it is more difficult to achieve high field quality near the transition region. Shaped shims are designed to limit the degradation of beam quality (emittance growth). This approach is closely related to a previous septum magnet design with two oppositely oriented dipole field regions presented by the authors [1]. Simulations are performed to obtain the magnetic field profile in both designs. A PIC simulation is used to transport a beam slice consisting of several thousand particles through the magnet to estimate emittance growth in the magnet due to field non-uniformity.
Lund Steven M.
Poole B. R.
Wang Lanjuan
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