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Description
Space-charge lenses based on confined non-neutral plasmas, such as electron clouds, provide strong, axially symmetric focusing for high-intensity ion beams and serve as an alternative to conventional quadrupole magnets. The so-called Mobley drift tube integrates a Gabor-Lens (GL) into a drift tube of a linear accelerator, enabling beam focusing within an accelerating RF structure. The confined electron cloud does not come into direct contact with the accelerating field; a re-entrant snout geometry is introduced and optimized to minimize the RF field amplitude in the region where the electron cloud forms. Confinement of sufficiently high electron density is achieved in the beam pipe of the drift tube without any external electron source, relying solely on self-sustained processes. This contribution presents simulations and RF measurements of an RF- and vacuum-compatible prototype Mobley drift tube designed for heavy-ion beams, providing insight into the operational feasibility and focusing performance of Gabor-lenses integrated in LINAC drift tubes.
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