Ion-Optical Tuning of the Large Acceptance Spectrometer for Improved Angular Resolution and Acceptance
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915994967998464 |
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| author | Miyagawa, Taichi Tanaka, Junki Ota, Shinsuke Dozono, Masanori Kobayashi, Nobuyuki Wickremasinghe, Lakmin Furukawa, Fumiya Ishii, Daichi Nishioka, Sho Takahashi, Kota Ukai, Erika |
| author_facet | Miyagawa, Taichi Tanaka, Junki Ota, Shinsuke Dozono, Masanori Kobayashi, Nobuyuki Wickremasinghe, Lakmin Furukawa, Fumiya Ishii, Daichi Nishioka, Sho Takahashi, Kota Ukai, Erika |
| contents | The trade-off between angular resolution and acceptance in scattering-angle measurements with a magnetic spectrometer is quantitatively evaluated for the Large Acceptance Spectrometer (LAS). The dependence on the multipole magnet field strength is investigated. Third-order transfer matrices were calculated with GICOSY, and particle transport was simulated with MOCADI. The vertical angular resolution is defined as the standard deviation between reconstructed and true angles, while the acceptance is determined from the transport efficiency within an elliptical gate in target angle space. The resolution improves with increasing field strength, reaching $σ_b \sim 5.5$ mrad at +20\%, consistent with $5.43 \pm 0.20$ mrad. In contrast, stronger fields reduce the vertical acceptance and solid angle. These results demonstrate a trade-off between resolution and acceptance. Enhanced vertical focusing shifts the focal condition away from the nominal focal plane, enabling high-precision reconstruction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_08127 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ion-Optical Tuning of the Large Acceptance Spectrometer for Improved Angular Resolution and Acceptance Miyagawa, Taichi Tanaka, Junki Ota, Shinsuke Dozono, Masanori Kobayashi, Nobuyuki Wickremasinghe, Lakmin Furukawa, Fumiya Ishii, Daichi Nishioka, Sho Takahashi, Kota Ukai, Erika Instrumentation and Detectors Nuclear Experiment The trade-off between angular resolution and acceptance in scattering-angle measurements with a magnetic spectrometer is quantitatively evaluated for the Large Acceptance Spectrometer (LAS). The dependence on the multipole magnet field strength is investigated. Third-order transfer matrices were calculated with GICOSY, and particle transport was simulated with MOCADI. The vertical angular resolution is defined as the standard deviation between reconstructed and true angles, while the acceptance is determined from the transport efficiency within an elliptical gate in target angle space. The resolution improves with increasing field strength, reaching $σ_b \sim 5.5$ mrad at +20\%, consistent with $5.43 \pm 0.20$ mrad. In contrast, stronger fields reduce the vertical acceptance and solid angle. These results demonstrate a trade-off between resolution and acceptance. Enhanced vertical focusing shifts the focal condition away from the nominal focal plane, enabling high-precision reconstruction. |
| title | Ion-Optical Tuning of the Large Acceptance Spectrometer for Improved Angular Resolution and Acceptance |
| topic | Instrumentation and Detectors Nuclear Experiment |
| url | https://arxiv.org/abs/2605.08127 |