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| URL | https://doi.org/10.18429/JACoW-IPAC2026-WEP5023 |
|---|---|
| Title | Improving energy spread of MESA beam in ERL operation |
| Authors |
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| Abstract | MESA, the Mainz Energy-Recovery Superconducting Accelerator, currently under commissioning at Johannes Gutenberg University Mainz, is designed to operate in two modes: external beam (EB) mode, with 150 μA polarized electrons at 155 MeV serving the P2 experiment, and energy-recovery linac (ERL) mode, with an unpolarized beam of 1–10 mA at up to 105 MeV for the MAGIX experiment. The latter requires precise control of the energy spread and the bunch length across various beam energies of 30, 55, 80, and 105 MeV. Comprehensive simulations were conducted using the tracking code ELEGANT; starting with a 4-ps bunch length, the full acceleration and deceleration process in ERL mode was modeled by optimizing the RF phase and the accelerating gradient field in off-crest operation, which results in the desired energy gain in each linac section. To reach the lowest energy spread, an appropriately selected longitudinal dispersion in the recirculation arcs is required. Since the beam is more sensitive to RF curvature and space-charge effects at low energies, reducing the bunch length by 50 % results in a small energy spread. Consequently, the injection arc lattice is optimized by adjusting the arc momentum compaction R56 as the primary tuning parameter. The integration of a chirp and R56 tuning enables efficient, controlled bunch compression and thereby enhances the overall beam quality. |
| Paper | download: WEP5023.pdf |
| Cite | BibTeX, LaTeX, Text/Word, RIS, EndNote |
| Conference | 17th International Particle Accelerator Conference |
| Series | |
| Location | Deauville, France |
| Date | 17-22 May 2026 |
| Publisher | JACoW Publishing, Geneva, Switzerland |
| Editorial Board | Peter McIntosh - Science and Technology Facilities Council (STFC/DL/ASTeC) Rogelio Tomas - CERN Hanna Franberg-Delahaye - GANIL Nicolas Delerue - IJCLab (CNRS and Université Paris-Saclay) Sabrina Lecerf - GANIL |
| Online ISBN | 978-3-95450-252-3 |
| Online ISSN | 2673-5350 |
| Received | 15 April 2026 |
| Revised | 12 October 2026 |
| Accepted | 21 October 2026 |
| Issued | 29 October 2026 |
| DOI | 10.18429/JACoW-IPAC2026-WEP5023 |
| Pages | 3109-3112 |
| Copyright | Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |