Speaker
Description
For the High-Energy Storage Ring (HESR) of the future Facility of Antiproton and Ion Research (FAIR) 44 bending magnets are being produced.
For beam dynamics simulations the precise knowledge of the harmonic content of their magnetic field is of major importance.
As the magnets are strongly bent (approximately 8.2 degrees with a total length of approximately 4.5 m) a measurement based on a rotating coil through the whole magnet is not feasible.
As an alternative we are considering hall probe-based measurements. The present layout comprises a movable disk with several radially placed hall probes.
For the measurement the disk is automatically moved to fixed positions along the central trajectory. A rotation of the disk is also considered in the design.
The measurement will be taken while the probe is at rest. The multipole coefficients will be estimated by Fourier transformation of the recorded values.
This contribution will present the status of the design but may as well serve as a basis for an exchange of experiences and ideas.
