Michael Maier

ROSE, Measuring the Full 4D Transverse Beam Matrix of Ion Beams

A ROtating System for Emittance measurements ROSE [1], to measure the full 4 dimensional transverse beam matrix of an ion beam has been developed and commissioned. Different ion beams behind the HLI at GSI have been used in two commissioning beam times. All technical aspects of ROSE have been tested, ROSE has been benchmarked against existing emittance scanners for horizontal and vertical projections, and the method, hard-, and software to measure the 4D beam matrix has been upgraded, refined, and successfully commissioned. The inter plane correlations of the HLI beam have been measured, yet as no significant initial correlations were found to be present, controlled coupling of the beam by using a skew triplet has been applied and confirmed with ROSE. The next step is to use ROSE to measure and remove the known inter plane correlations of a uranium beam before SIS18 injection.

Results of the experiments on emittance transfer EMTEX

EMTEX is an experimental setup to proof the principle of transverse emittance partitioning on an ion beam. According to simulations it is possible to transfer emittance by changing only the magnetic field of a solenoid with a charge state changing stripper inside. The change of charge state in the solenoid changes the set of eigenemittances and the skew quadrupoles serve to remove inter-plane correlations. The field strength of the solenoid determines the amount of transfer between the eigenemittances. A detailed description of the concept and the beam line itself is given in [1].