Beam shaping using an ultrahigh vacuum multileaf collimator and emittance exchange beamline

We report the development of a multileaf collimator (MLC) for charged particle beams, based on independently actuated tungsten strips that can selectively scatter unwanted particles. The MLC is used in conjunction with an emittance exchange beamline to rapidly generate highly variable longitudinal bunch profiles. developed consists 40 independent leaves are 2 mm wide and move up 10 operates ultrahigh vacuum environment, enabled by novel features such as magnetically coupled actuation. An experiment at Argonne Wakefield Accelerator, which previously inflexible, laser-cut masks beam shaping before beamline, was conducted test functionality. demonstrated myriad transverse mask silhouettes, measured scintillator downstream MLC, corresponding profiles after exchange, using transverse-deflecting cavity. Rapidly changing between shapes enables expeditious execution various experiments without downtime associated traditional methods. many degrees freedom enable optimization experimental figures merit feed-forward control advanced machine learning methods.Received 6 October 2022Accepted 31 January 2023DOI:https://doi.org/10.1103/PhysRevAccelBeams.26.022801Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasBeam controlCollimationAccelerators & Beams