TRIUMF, Vancouver, Canada
TRIUMF, Vancouver, Canada
FRBI03
TRIUMF, Vancouver, Canada
PSI, Villigen PSI, Switzerland
TRIUMF, Vancouver, Canada
| Paper | Title | Page |
|---|---|---|
| MOPO014 | Design Studies of the Cylindrically Symmetric Magnetic Inflector | 87 |
|
||
| 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. | ||
|
|
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 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUAO04 | Design of a Multi-Harmonic Buncher for TRIUMF 500 MeV Cyclotron | 118 |
|
||
| The TRIUMF 500 MeV cyclotron injection system consists of a 40 m long beamline to transport the 300 keV H− ion beams into the cyclotron. Part of the original beamline, the vertical injection section, was replaced in 2011 and, while the remaining horizontal injection section is being redesigned for replacement. As part of the horizontal injection beamline upgrade, the present buncher system will be replaced with a new one. Presently, the injection system consists of two double gap bunchers. The first buncher operates at the cyclotron RF frequency (23.06 MHz) while the second operates at the second harmonic frequency (46.12 MHz). The proposed new buncher is based on a two-electrode multi-harmonic system, which will be operated by up to three harmonics. The beam dynamics studies have been performed, including the space-charge effects using the particle-in-cell code WARP. Simulation results of longitudinal beam dynamics are presented for transporting beam intensity up to 1 mA. | ||
|
|
Slides TUAO04 [2.473 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-TUAO04 | |
| About • | Received ※ 03 January 2023 — Revised ※ 11 February 2023 — Accepted ※ 13 February 2023 — Issue date ※ 05 March 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
FRBI03 |
Closing Ceremony Summary of CYC2022 | |
|
||
| The talk will provide an overview of the presentations and discussions at CYC2022 which were focused on the latest developments in cyclotron projects and proposals, their technology, including improvements in particle acceleration and target design, advances in beam delivery systems and treatment planning, and the use of cyclotrons in medical and industrial applications. A status report and an overview about the numerical and geographical distribution of the contributions will be given. | ||
|
|
Slides FRBI03 [21.647 MB] | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| FRBO04 | Error Magnetic Field due to the Median Plane Asymmetry and Its Applications in the Cyclotron | 381 |
|
||
| 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. | ||
|
|
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) | |