10–15 Aug 2025
SAFE Credit Union Convention Center
America/Los_Angeles timezone

Mitigation of Coherent Synchrotron Radiation by Bunch Profile Optimization and Shielding

TUP067
12 Aug 2025, 16:00
2h
SAFE Credit Union Convention Center

SAFE Credit Union Convention Center

1401 K St, Sacramento, CA 95814
Poster Presentation MC5 – Beam Dynamics and EM Fields TUP: Tuesday Poster Session

Speaker

Omkar Ramachandran (Northern Illinois University, Argonne National Laboratory)

Description

The mitigation of the effects of coherent synchrotron radiation (CSR) is a key challenge in generating high brightness beams. Shielding by parallel plates installed in the dipole magnet vacuum chambers shows promise, both in simulation and experiment at small shielding gap separations. In this work, we consider a beam traversing a chicane with larger cm-scale separations on each dipole, necessitating the combined use of longitudinal profile shaping and shielding to reduce emittance growth. We model the radiated CSR using a 3D integrated Green's function technique that accounts for the complete 6D phase space of the bunch along with image charges to model shielding. This method is used in conjunction with a genetic algorithm to optimize the longitudinal current profile. Our results indicate current profiles that differ to results derived without shielding* and allow for effective mitigation of emittance growth at cm-scale gaps. We will present details of the simulation and optimization method along with future plans, including ongoing experiments at the Argonne Wakefield Accelerator as part of a collaboration that seeks to investigate the effects of CSR on beams.

Footnotes

  • Yakimenko et al., Phys. Rev. Lett. 109, 164802, 2012
    ** Mitchell et al., Phys. Rev. ST Accel. Beams 16, 060703, 2013

Funding Agency

This research was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award DE-SC0024445.

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Author

Omkar Ramachandran (Northern Illinois University, Argonne National Laboratory)

Co-authors

Gwanghui Ha (Northern Illinois University) Chengkun Huang (Los Alamos National Laboratory) Xueying Lu (Northern Illinois University) John Power (Argonne National Laboratory) Ji Qiang (Lawrence Berkeley National Laboratory)

Presentation materials

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