| Paper | Title | Other Keywords | Page |
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| MOPB017 | Analysis of the Fluctuation of Resonance Driving Terms for Nonlinear Lattice Optimization | sextupole, storage-ring, resonance, controls | 41 |
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| Minimizing resonance driving terms (RDTs) of nonlinear magnets is a traditional approach to enlarge the dynamic aperture (DA) of a storage ring. The local cancellation of nonlinear dynamics, which is adopted by some diffraction-limited storage rings, is more effective than the global cancellation. The former has smaller fluctuation of RDTs along the ring. In this paper, the correlation between two kinds of RDT fluctuations is found. The qualitative analysis shows that minimizing the RDT fluctuations is beneficial for controlling the crossing terms and thus enlarging the DA. This qualitative analysis is supported by the statistical analysis of nonlinear solutions of a double-bend achromat lattice. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB017 | ||
| About • | Received ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 April 2024 | ||
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| MOPB019 | Development Status of Beam Dynamics Software APES for CEPC | collider, alignment, positron, software | 49 |
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Funding: Innovative Fund of IHEP The physical design and research work of China Electron Positron Collider (CEPC) is an unprecedented challenge in the field of international accelerator collider. In the simulation research, many physical phenomena must be considered, including large Piwinski angle, crab waist colliding, strong nonlinear effect, energy sawtooth, beam-beam, etc. To address this challenge, a software project APES is proposed in 2021. And this project received support from the IHEP innovative fund in 2022. The progress and future plans of APES project will be introduced in the poster. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB019 | ||
| About • | Received ※ 05 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 16 September 2024 | ||
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| MOPB039 | Low-Alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation | storage-ring, radiation, electron, coupling | 88 |
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| A new concept is proposed for minimizing the longitudinal emittance of a low momentum compaction factor (low-alpha) storage ring which has the capability to stably store sub-femtosecond electron bunches for the first time. This storage ring is designed for Steady-State microbunching (SSMB) to generate kW level average power EUV radiation. The proposed design approach can be applied to any quasi-isochronous storage rings to yield very high radiation power due to longitudinal coherence of the radiation. We obtain an optimal lattice design by minimizing global and local momentum compaction factors simultaneously and the result of single-particle tracking shows that the electron beam with equilibrium rms bunch length of about 40 nm can be stored in this ring. Nonlinear dynamics is studied for this lattice. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB039 | ||
| About • | Received ※ 03 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 31 December 2023 | ||
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| TUPB010 | Dynamics Design on 70-250Mev Proton Linac | proton, acceleration, linac, radiation | 102 |
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| Charged proton beams have broad application prospects, and research on compact S-band proton linear accelerators is increasingly heating up in recent years. For radiation therapy, to achieve the conventional penetration range of water-equivalent tissues, protons with energy of 70 to 230MeV are required. The design of electromagnetic structure is closely related to particle dynamics design. A flexible and controllable particle dynamic tracking code (PDT) through both traveling wave and standing wave acceleration has been compiled to simulate particle trajectory and satisfy automatic tuning of the various components in the entire acceleration chain. The linac with a total length of approximately 8.2m composed of 16 tanks of backward traveling wave structures and permanent magnet quadrupole lenses was designed, operating at an RF frequency of 2.856GHz with a target acceleration gradient of 30MV/m, and accelerating proton beam from 70MeV to 250MeV while maintaining low emittance and high transmission efficiency. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB010 | ||
| About • | Received ※ 09 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 11 August 2023 | ||
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| TUPB014 | Design of a Large Momentum Acceptance Gantry Based on AG-CCT for Lightweight Proton Therapy Facility | toolkit, simulation, proton, optics | 111 |
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Funding: This work was supported by the National Natural Science Foundation of China under Grant 11975107, 12205111. Superconducting (SC) gantry can be applied to proton therapy with significantly reduced footprint and weight. However, the relatively lower ramping limit of the SC magnetic field becomes a bottle-neck for fast energy change and beam delivery. The issue can be mitigated by designing a large momentum acceptance (LMA) beam optics. We present the design of an LMA gantry using AG-CCT SC magnets and symmetrical achromatic lattice. A fast degrader is combined in the design so that the gantry can rapidly switch energy during the treatment. The AG-CCT design process and beam transport simulation are all performed with our homemade integrated code CSPT, which has interfaces to Geant-4 and Opera, and can reach a maximum speed-up ratio of ~450 by applying parallel computation technique. The multi-particle simulation based on realistic field distribution proves that the gantry has a large momentum acceptance of ~20%. Due to its large momentum acceptance, the dispersion effect caused by the scanning magnet is not neglectable. A dispersion compensation method, accompanied by a compact nozzle layout, is proposed to achieve a scanning field of 25×25 cm2 with a maximum beam energy spread of 5.2%. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB014 | ||
| About • | Received ※ 28 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 23 April 2024 | ||
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