Speaker
Description
PETRA IV is the upcoming fourth generation 6 GeV low-emittance light source
at DESY Hamburg. Two beam feedback systems are currently being developed.
The multi-bunch feedback system (MBFB), which minimizes bunch instability,
is based on an RFSoC design with newly developed hardware. The first board
designs and the local MBFB scheme are presented. The Fast Orbit Feedback
System (FOFB) for PETRA IV will be a large multi-input multi-output (MIMO)
control system in an extended star topology. The layout is optimised to
reduce latency between the 790 beam position monitors (BPM) and the 560 fast
correction magnets. The FOFB system is mainly based on MicroTCA technology.
The high-speed data transfer and distributed signal processing for the
centralised control scheme will be implemented on over 500 Advanced
Mezzanine Cards (AMC) in approximately 100 MicroTCA crates. The corrector
strength for the feedback is calculated centrally based on the global BPM
data. We present the orbit feedback topology, the modelling of the
individual subsystems and their interaction in the overall feedback scheme.
