| Internal Note | |
| Report number | CERN-ACC-NOTE-2023-0009 ; CERN-NIMMS-015 |
| Title | IMPACTS OF STRONGLY CURVED MAGNETIC MULTIPOLES ON COMPACT SYNCHROTRON DYNAMICS |
| Author(s) | Norman, H X Q (University of Manchester, Manchester, UK and Cockcroft Institute, Warrington, UK and University of Melbourne, Melbourne, Australia) ; Appleby, R B (Univrsity of Manchester, Manchester, UK and Cockcroft Institute, Warrington, UK) ; Sheehy, S L (Australian Nuclear Science and Technology Organisation (ANSTO), Australia) ; Benedetto, Elena (SEEIIST Association (CH)) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2023 |
| Imprint | 30 Jun 2023 |
| Number of pages | 6 |
| Subject category | Accelerators and Storage Rings |
| Study | CERN NIMMS |
| Abstract | Superconducting curved magnets can reduce accelerator footprints by producing strong fields (>3 T) for applications such as carbon ion therapy, however the effect of strongly curved magnetic multipoles and fringe fields on accelerator beam dynamics is not fully understood. This is especially important for compact synchrotrons, where off-axis body fields and fringe fields can significantly affect beam qual-ity and long-term beam stability. To establish the effect of magnet curvature on higher order multipole fields and on beam stability, an electromagnetic model of a supercon-ducting, curved alternating- gradient canted-cosine-theta magnet (AG-CCT) is analysed. The magnet is studied for the main bending magnets in a 27 m circumference carbon ion therapy synchrotron, designed within the Next Ion Med-ical Machine Study (NIMMS) at CERN and the European project HITRIplus. The multipole fields of the magnet are implemented in a lattice model of the synchrotron in MAD-X/PTC to study long term beam stability, and to understand the effect of curved multipoles on particle dynamics for opti-misation of both the lattice and magnet designs. Preliminary assessment of the performance of the synchrotron finds that the AG-CCT multipoles are well-tolerated in the lattice. Re-sults are discussed for the suitability of the synchrotron for clinical application. |
| Submitted by | [email protected] |
Record creato 2023-07-14, modificato l'ultima volta il 2023-07-14
