Linear coupling and tune adjustment for the 500 MeV cyclotron
The horizontal and vertical betatron tunes vary during acceleration in TRIUMF 500 MeV cyclotron, leading the beam to cross the linear coupling resonance ν_{r}-ν_{z}=1 multiple times. This results in a measurable transfer of betatron amplitude between the horizontal and the vertical planes. In this p...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-10-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.26.102801 |
| _version_ | 1797666273328365568 |
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| author | L. G. Zhang Y.-N. Rao R. Baartman Y. Bylinskii T. Planche |
| author_facet | L. G. Zhang Y.-N. Rao R. Baartman Y. Bylinskii T. Planche |
| author_sort | L. G. Zhang |
| collection | DOAJ |
| description | The horizontal and vertical betatron tunes vary during acceleration in TRIUMF 500 MeV cyclotron, leading the beam to cross the linear coupling resonance ν_{r}-ν_{z}=1 multiple times. This results in a measurable transfer of betatron amplitude between the horizontal and the vertical planes. In this paper, we report the observation of an unanticipated crossing of this resonance which cannot be understood from the tune diagram derived from the original magnetic field survey of the cyclotron. We present how we have resolved this conundrum and the technique we have developed to measure the vertical tune, which is particularly challenging in a cyclotron. To correct the deleterious effects of this particular crossing, rather than canceling the resonance driving term, a new strategy was adopted whereby the vertical tune is adjusted locally and pushed away from the resonance line. This is accomplished using the axial field of trim coils, while also maintaining the overall isochronism of the machine. |
| first_indexed | 2024-03-11T19:57:08Z |
| format | Article |
| id | doaj.art-1e4e67cb25b04bedab16ad9b83e0a47c |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-03-11T19:57:08Z |
| publishDate | 2023-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-1e4e67cb25b04bedab16ad9b83e0a47c2023-10-04T17:32:50ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882023-10-01261010280110.1103/PhysRevAccelBeams.26.102801Linear coupling and tune adjustment for the 500 MeV cyclotronL. G. ZhangY.-N. RaoR. BaartmanY. BylinskiiT. PlancheThe horizontal and vertical betatron tunes vary during acceleration in TRIUMF 500 MeV cyclotron, leading the beam to cross the linear coupling resonance ν_{r}-ν_{z}=1 multiple times. This results in a measurable transfer of betatron amplitude between the horizontal and the vertical planes. In this paper, we report the observation of an unanticipated crossing of this resonance which cannot be understood from the tune diagram derived from the original magnetic field survey of the cyclotron. We present how we have resolved this conundrum and the technique we have developed to measure the vertical tune, which is particularly challenging in a cyclotron. To correct the deleterious effects of this particular crossing, rather than canceling the resonance driving term, a new strategy was adopted whereby the vertical tune is adjusted locally and pushed away from the resonance line. This is accomplished using the axial field of trim coils, while also maintaining the overall isochronism of the machine.http://doi.org/10.1103/PhysRevAccelBeams.26.102801 |
| spellingShingle | L. G. Zhang Y.-N. Rao R. Baartman Y. Bylinskii T. Planche Linear coupling and tune adjustment for the 500 MeV cyclotron Physical Review Accelerators and Beams |
| title | Linear coupling and tune adjustment for the 500 MeV cyclotron |
| title_full | Linear coupling and tune adjustment for the 500 MeV cyclotron |
| title_fullStr | Linear coupling and tune adjustment for the 500 MeV cyclotron |
| title_full_unstemmed | Linear coupling and tune adjustment for the 500 MeV cyclotron |
| title_short | Linear coupling and tune adjustment for the 500 MeV cyclotron |
| title_sort | linear coupling and tune adjustment for the 500 mev cyclotron |
| url | http://doi.org/10.1103/PhysRevAccelBeams.26.102801 |
| work_keys_str_mv | AT lgzhang linearcouplingandtuneadjustmentforthe500mevcyclotron AT ynrao linearcouplingandtuneadjustmentforthe500mevcyclotron AT rbaartman linearcouplingandtuneadjustmentforthe500mevcyclotron AT ybylinskii linearcouplingandtuneadjustmentforthe500mevcyclotron AT tplanche linearcouplingandtuneadjustmentforthe500mevcyclotron |