Demonstration of a novel phase space painting method in a coupled lattice to mitigate space charge in high-intensity hadron beams
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866915744090947584 |
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| author | Evans, Nicholas J. Hoover, Austin Gorlov, Timofey Morozov, Vasiliy |
| author_facet | Evans, Nicholas J. Hoover, Austin Gorlov, Timofey Morozov, Vasiliy |
| contents | Multi-turn charge-exchange injection is the primary method of creating high-intensity hadron beams in circular accelerators, and phase space painting during injection enables tailoring of the accumulated phase space distribution. A technique we call eigenpainting allows injection of particles into a single mode of a coupled ring, providing full four-dimensional control of the phase space distribution. Under ideal conditions, uniform eigenpainting generates a linear-force equilibrium distribution in the transverse plane, with zero volume in four-dimensional transverse phase space, even including space charge. We have implemented eigenpainting for the first time in the Spallation Neutron Source (SNS) Accumulator Ring. Injecting 8.8 $μ$C of 800 MeV beam, we obtain a final ratio of intrinsic transverse emittances of $\approx$2.4. We analyze the effect of space charge on the final distribution through comparison of the reconstructed phase space to particle-in-cell simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_13517 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Demonstration of a novel phase space painting method in a coupled lattice to mitigate space charge in high-intensity hadron beams Evans, Nicholas J. Hoover, Austin Gorlov, Timofey Morozov, Vasiliy Accelerator Physics Applied Physics Multi-turn charge-exchange injection is the primary method of creating high-intensity hadron beams in circular accelerators, and phase space painting during injection enables tailoring of the accumulated phase space distribution. A technique we call eigenpainting allows injection of particles into a single mode of a coupled ring, providing full four-dimensional control of the phase space distribution. Under ideal conditions, uniform eigenpainting generates a linear-force equilibrium distribution in the transverse plane, with zero volume in four-dimensional transverse phase space, even including space charge. We have implemented eigenpainting for the first time in the Spallation Neutron Source (SNS) Accumulator Ring. Injecting 8.8 $μ$C of 800 MeV beam, we obtain a final ratio of intrinsic transverse emittances of $\approx$2.4. We analyze the effect of space charge on the final distribution through comparison of the reconstructed phase space to particle-in-cell simulations. |
| title | Demonstration of a novel phase space painting method in a coupled lattice to mitigate space charge in high-intensity hadron beams |
| topic | Accelerator Physics Applied Physics |
| url | https://arxiv.org/abs/2601.13517 |