The geometrical acceptance of the system is such, that for reactions
slightly above their reaction threshold all charged particles
leave the dipole and are measured in the detectors.
For higher beam momenta particles are measurable in specific
directions and momentum regions.
picture shows the momentum acceptance for positively
charged particles that manage to exit the vacuum chamber
The particle momentum is displayed as a discrete sequence of sphere
segments parametrized as fraction of the beam momentum.
acceptances for the particle 'X' in the reaction
pp->ppX show that the mean efficiency is > 20 %
even at an excess momentum of 10 MeV/c.
A special COSY
beam optics has been developed in order to minimise the
beam diameters at the interaction zone in the COSY-11 target
Last updated: 23-December-1997 by