Precise position- and angle-control of a proton beam

For a parity experiment at the Bonn Cyclotron the alignment of the polarized proton beam was stabilized to a precision of less than a μm and μrad, respectively. This stabilization was achieved using fast position pick-ups, fast automatic and low-noise control electronics, and fast steerer devices. Special attention has been payed to neutralize mutual couplings of position signals in space- and time-domain by means of a matrix decoupler.