Computing for accelerator physics Ilya Agapov, 7/12/09, DESY ...

Beam optics
Accelerator dimensions given by:
maximum accelerating E field (linear)
maximum bending magnet strength (circular)
Tasks of beam optics –
steer the beam to the experimental station meeting the constraints:
✔ geometrical layout ­­ steering with dipole magnets – e.g. Desy to Schenefeld
✔ fit in the aperture (focusing)
✔ provide necessary beam sizes at experimental stations (focusing)
✔ correct chromatic effects (focusing depending on energy)
✔ in circular accelerators – in addition provide stability
Common approach (strong focusing) – build accelerators from blocks similar to light optics e.g.
dipole magnet – bend, quadrupole – focus/defocus, sextupole ­ correct aberrations,
RF cavity ­ accelerate