Design of a resonant slow extraction from low emittance electron booster rings using transverse resonance island buckets

In this contribution we present the design of a resonant slow extraction based on the radio frequency knock-out (RF-KO) scheme, where we make use of the transverse resonance islands bucket (TRIB) optics. The generation of the TRIB optics is presented in two example lattices, that are considered for the potential upgrade of the current booster at DESY. The slow extraction would potentially supply high energy electron beams to the HEP beamline users. Simulations show an extraction efficiency in excess of 90% with a septum blade thickness of \SI{100}{\micro\meter}.