Baumgarten, C. JACoW Publishing Geneva, Switzerland 2673-5482 978-3-95450-212-7 10.18429/JACoW-CYCLOTRONS2022-TUAI01 English 110-114 cyclotron extraction proton acceleration cavity Contribution to a conference proceedings 2023 2023-10 https://doi.org/10.18429/JACoW-CYCLOTRONS2022-TUAI01 https://jacow.org/cyclotrons2022/papers/tuai01.pdf One of the decisive issues in the design and operation of cyclotrons is the choice of the beam extraction method. Typical methods are extraction by electrostatic extractors and by stripping. The former method requires DC high voltage electrodes which are notorious for high-voltage breakdowns. The latter method requires beams of atomic or molecular ions which are notorious for rest gas and Lorentz stripping. We discuss the conditions to be met such that a charged particle beam will leave the magnetic field of an isochronous cyclotron purely by fast acceleration.