Measurements of the transverse beam-halo population at large amplitudes in the Large Hadron Collider (LHC) provide crucial insights into the stored beam energy near the LHC collimators. These particles do not contribute significantly to the luminosity but their loss could impose limitations on accelerator performance through sudden loss spikes or even collimator damage in case of fast beam...
Employing octupole magnets for Landau damping of transverse single-bunch instabilities in synchrotrons often restricts the dynamic aperture due to the excitation of betatron resonances. The situation complicates in the presence of strong direct space charge fields. A notable case is the 1-second accumulation plateau of the heavy-ion synchrotron SIS100 at the Facility of Antiproton and Ion...
Eddy currents induced by rippling magnets in axially asymmetric vacuum chambers are known to generate magnetic multipoles of higher orders, with a dynamic sextupole driven by a time-varying dipole being a common example. However, the inverse phenomenon—lower-order multipoles created by an oscillating higher-order multipole magnet, though consistent with Maxwell’s equations—has not been...
