High-precision beam profile measurement with a microchannel-plate detector in the high magnetic field of the WISArD experiment
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arXiv
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2026
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| author | Lecanuet, S. Fléchard, X. Alfaurt, P. Ascher, P. Atanasov, D. Blank, B. Daudin, L. DePreaumont, H. Gerbaux, M. Giovinazzo, J. Grévy, S. Guignard, G. Ha, J. Knapen, C. Lechner, S. Lépine, A. Lory, J. Perronnel, J. Pomorski, M. Roche, M. Roumegou, C. Severijns, N. Son, Y. Vanlangendonck, S. Versteegen, M. Zakoucky, D. |
| author_facet | Lecanuet, S. Fléchard, X. Alfaurt, P. Ascher, P. Atanasov, D. Blank, B. Daudin, L. DePreaumont, H. Gerbaux, M. Giovinazzo, J. Grévy, S. Guignard, G. Ha, J. Knapen, C. Lechner, S. Lépine, A. Lory, J. Perronnel, J. Pomorski, M. Roche, M. Roumegou, C. Severijns, N. Son, Y. Vanlangendonck, S. Versteegen, M. Zakoucky, D. |
| contents | We present the development and characterization of a compact low-energy ion beam diagnostic for the WISArD (Weak Interaction Studies with $\mathrm{^{32}Ar}$ Decay) experiment at ISOLDE/CERN. The microchannel plate (MCP) detector, which is configured in a Z-stack and has a resistive position sensitive anode, was tested with both stable and radioactive beams. This work focuses on the image reconstruction method, which corrects the pincushion distortion inherent to the square-shaped resistive anode, and investigates the influence of the magnetic field on the detector performance. Our results demonstrate that the detector achieves beam profile measurements with sub-millimeter accuracy, while coping with the spatial and high-magnetic field (4 T) constraints of the experiment. These capabilities meet the precision requirements of the WISArD experiment for extracting the modified beta-neutrino angular correlation coefficient, ã$_{βν}$, with an uncertainty of 0.1%. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12964 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-precision beam profile measurement with a microchannel-plate detector in the high magnetic field of the WISArD experiment Lecanuet, S. Fléchard, X. Alfaurt, P. Ascher, P. Atanasov, D. Blank, B. Daudin, L. DePreaumont, H. Gerbaux, M. Giovinazzo, J. Grévy, S. Guignard, G. Ha, J. Knapen, C. Lechner, S. Lépine, A. Lory, J. Perronnel, J. Pomorski, M. Roche, M. Roumegou, C. Severijns, N. Son, Y. Vanlangendonck, S. Versteegen, M. Zakoucky, D. Instrumentation and Detectors We present the development and characterization of a compact low-energy ion beam diagnostic for the WISArD (Weak Interaction Studies with $\mathrm{^{32}Ar}$ Decay) experiment at ISOLDE/CERN. The microchannel plate (MCP) detector, which is configured in a Z-stack and has a resistive position sensitive anode, was tested with both stable and radioactive beams. This work focuses on the image reconstruction method, which corrects the pincushion distortion inherent to the square-shaped resistive anode, and investigates the influence of the magnetic field on the detector performance. Our results demonstrate that the detector achieves beam profile measurements with sub-millimeter accuracy, while coping with the spatial and high-magnetic field (4 T) constraints of the experiment. These capabilities meet the precision requirements of the WISArD experiment for extracting the modified beta-neutrino angular correlation coefficient, ã$_{βν}$, with an uncertainty of 0.1%. |
| title | High-precision beam profile measurement with a microchannel-plate detector in the high magnetic field of the WISArD experiment |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2602.12964 |