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A proof-of-principle experimental setup for the extraction of 6 GeV electronsfrom the DESY II Booster Synchrotron using the channeling effect in a bentcrystal is elaborated. Various aspects of the experimental setup wereinvestigated in detail, such as the particle beam dynamics during theextraction process, the manufacturing and characterization of bent crystals,and the detection of the extracted beam. In order to optimize the crystalgeometry, the overall process of beam extraction was simulated, taking intoaccount the influence of radiation energy losses. As result it is concludedthat the multi-turn electron beam extraction efficiency can reach up to 16 %.  In principle this crystal-based beam extraction technique can be applied atany electron synchrotron in order to provide multi-GeV electron beams in aparasitic mode. This technique will allow to supply fixed-target experiments byintense high-quality monoenergetic electron beams. Furthermore,electron/positron crystal-based extraction from future lepton colliders mayprovide an access to unique experimental conditions for ultra-high energyfixed-target experiments including searches for new physics beyond the StandardModel.

First design of a crystal-based extraction of 6 GeV electrons for the DESY II Booster Synchrotron