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

N. Majernik, G. Andonian, W. Lynn, S. Kim, C. Lorch, R. Roussel, S. Doran, E. Wisniewski, C. Whiteford, P. Piot, J. Power, and J. B. Rosenzweig
Phys. Rev. Accel. Beams 26, 022801 – Published 22 February 2023

Abstract

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. The developed MLC consists of 40 independent leaves that are 2 mm wide and can move up to 10 mm and operates in an ultrahigh vacuum environment, enabled by novel features such as magnetically coupled actuation. An experiment at the Argonne Wakefield Accelerator, which previously used inflexible, laser-cut masks for beam shaping before an emittance exchange beamline, was conducted to test functionality. The experiment demonstrated myriad transverse mask silhouettes, as measured on a scintillator downstream of the MLC, and the corresponding longitudinal profiles after emittance exchange, as measured using a transverse-deflecting cavity. Rapidly changing between mask shapes enables expeditious execution of various experiments without the downtime associated with traditional methods. The many degrees of freedom of the MLC can enable the optimization of experimental figures of merit using feed-forward control and advanced machine learning methods.

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  • Received 6 October 2022
  • Accepted 31 January 2023

DOI:https://doi.org/10.1103/PhysRevAccelBeams.26.022801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

N. Majernik1,*, G. Andonian1, W. Lynn1, S. Kim2, C. Lorch1, R. Roussel3, S. Doran2, E. Wisniewski2, C. Whiteford2, P. Piot2,4, J. Power2, and J. B. Rosenzweig1

  • 1University of California Los Angeles, Los Angeles, California 90095, USA
  • 2Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 3SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 4Northern Illinois University, DeKalb, Illinois 60115, USA

  • *NMajernik@g.ucla.edu

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Vol. 26, Iss. 2 — February 2023

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