Particle-core analysis of dispersion effects on beam halo formation
A simple particle-core model for circular accelerators has been constructed assuming that dispersion effects are relatively weak. This model is applicable to a large class of high-intensity rings designed for modest density applications such as spallation neutron sources. Applying this model to isot...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
1999-12-01
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| Series: | Physical Review Special Topics. Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevSTAB.2.124201 |
| _version_ | 1811202673739825152 |
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| author | Masanori Ikegami Shinji Machida Tomonori Uesugi |
| author_facet | Masanori Ikegami Shinji Machida Tomonori Uesugi |
| author_sort | Masanori Ikegami |
| collection | DOAJ |
| description | A simple particle-core model for circular accelerators has been constructed assuming that dispersion effects are relatively weak. This model is applicable to a large class of high-intensity rings designed for modest density applications such as spallation neutron sources. Applying this model to isotropic beams in a smooth ring, halo formation processes in the presence of dispersion are investigated. In the analysis, it is found that dispersion matching is essential to suppress horizontal beam widening in injection if momentum spread is larger than a certain threshold. Even if the beam widening due to dispersion mismatch is suppressed, a halo can be formed in the same mechanism as in a linac, namely, parametric resonance between oscillating core and single particles. The width of halos formed by the particle-core resonance in modest-density rings is found to be a little narrower than that in a straight channel, and typically 1.6 to 1.8 times the maximum core width. |
| first_indexed | 2024-04-12T02:42:36Z |
| format | Article |
| id | doaj.art-f92911850622436c8d30868d2499afa8 |
| institution | Directory Open Access Journal |
| issn | 1098-4402 |
| language | English |
| last_indexed | 2024-04-12T02:42:36Z |
| publishDate | 1999-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Special Topics. Accelerators and Beams |
| spelling | doaj.art-f92911850622436c8d30868d2499afa82022-12-22T03:51:16ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44021999-12-0121212420110.1103/PhysRevSTAB.2.124201Particle-core analysis of dispersion effects on beam halo formationMasanori IkegamiShinji MachidaTomonori UesugiA simple particle-core model for circular accelerators has been constructed assuming that dispersion effects are relatively weak. This model is applicable to a large class of high-intensity rings designed for modest density applications such as spallation neutron sources. Applying this model to isotropic beams in a smooth ring, halo formation processes in the presence of dispersion are investigated. In the analysis, it is found that dispersion matching is essential to suppress horizontal beam widening in injection if momentum spread is larger than a certain threshold. Even if the beam widening due to dispersion mismatch is suppressed, a halo can be formed in the same mechanism as in a linac, namely, parametric resonance between oscillating core and single particles. The width of halos formed by the particle-core resonance in modest-density rings is found to be a little narrower than that in a straight channel, and typically 1.6 to 1.8 times the maximum core width.http://doi.org/10.1103/PhysRevSTAB.2.124201 |
| spellingShingle | Masanori Ikegami Shinji Machida Tomonori Uesugi Particle-core analysis of dispersion effects on beam halo formation Physical Review Special Topics. Accelerators and Beams |
| title | Particle-core analysis of dispersion effects on beam halo formation |
| title_full | Particle-core analysis of dispersion effects on beam halo formation |
| title_fullStr | Particle-core analysis of dispersion effects on beam halo formation |
| title_full_unstemmed | Particle-core analysis of dispersion effects on beam halo formation |
| title_short | Particle-core analysis of dispersion effects on beam halo formation |
| title_sort | particle core analysis of dispersion effects on beam halo formation |
| url | http://doi.org/10.1103/PhysRevSTAB.2.124201 |
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