| Paper | Title | Page |
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| MOPO014 | Design Studies of the Cylindrically Symmetric Magnetic Inflector | 87 |
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| The spiral inflector steers the beam from the bore in the main magnet into the median plane to achieve the axial injection with an external ion source. In a conventional electrostatic infector, the injection beam energy is limited by the breakdown voltage on the electrodes. At the same time, the injection intensity is also limited by the small aperture in the electrostatic inflector. Magnetic inflector is a promising alternative to overcome these disadvantages. To demonstrate the technology, we use the TR100 main magnet model, a conceptual idea of an H2+ cyclotron, as a testbench to study the inflection conditions and optics of the passive magnetic inflector with a cylindrically symmetric structure. A mirror-like field with optimized mirror length and ratio provides a well-focused beam arriving at the median plane. The required magnetic field is produced by shimming a center plug in the injection hole. The space charge effect is also discussed with the simulation of a high-intensity injection beam. | ||
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Poster MOPO014 [0.678 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOPO014 | |
| About • | Received ※ 04 December 2022 — Revised ※ 01 February 2023 — Accepted ※ 06 February 2023 — Issue date ※ 04 March 2023 | |
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| WEPO008 | H- Intra-Beam Stripping Loss Rate in Isochronous Cyclotron | 219 |
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Funding: This work was funded by TRIUMF which receives federal funding via a contribution agreement with the National Research Council of Canada. Binary collisions inside a H- bunch result in H- stripping and subsequent particle loss. This phenomenon, called intra-beam stripping, was observed in LEAR and SNS superconducting linac. We mimic the derivation made for the linac to derive the intra-beam stripping loss rate for an isochronous cyclotron. And then, we apply this theory to the TRIUMF 500 MeV H- cyclotron to estimate the loss. |
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Poster WEPO008 [1.189 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEPO008 | |
| About • | Received ※ 05 December 2022 — Revised ※ 04 February 2023 — Accepted ※ 07 February 2023 — Issue date ※ 14 July 2023 | |
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| FRBO04 | Error Magnetic Field due to the Median Plane Asymmetry and Its Applications in the Cyclotron | 381 |
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| Cyclotrons have a median plane symmetric structure. But the pole’s geometric error and the unevenly magnetized soft iron give rise to non-zero asymmetrical fields in the geometric median plane. The asymmetric field can shift the vertical position of the beam. Moreover, The error of the tilted median plane can be the driving force when the tunes pass through coupling resonances. In this paper, we take the TRIUMF 500 MeV cyclotron as an example to study the asymmetric field resulting from imperfect median plane symmetry. An approach due to M. Gordon, and a highly accurate compact finite differentiation method are used to investigate the historical field survey data, which reveals redundancy in the survey data. The redundancy was used in this study to correct the error in the measurement data. Further, the median plane asymmetry field could be manipulated using trim coils or harmonic coils with top and bottom coil currents in opposite directions (’Br-mode’). Using the created asymmetric field, we improved the vertical tune measurement method to investigate the linear coupling resonance in TRIUMF 500 MeV cyclotron. Eventually, the coupling resonance is corrected and avoided using the available harmonic coils and trim coils. | ||
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Slides FRBO04 [1.620 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-FRBO04 | |
| About • | Received ※ 29 December 2022 — Revised ※ 07 February 2023 — Accepted ※ 10 February 2023 — Issue date ※ 10 July 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |