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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2509.06186 |
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| _version_ | 1866915484002156544 |
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| author | Magory, Eyal Bratman, Vladimir L. Steiner, Ahiya Balal, Nezah |
| author_facet | Magory, Eyal Bratman, Vladimir L. Steiner, Ahiya Balal, Nezah |
| contents | We report the implementation of two types of helical microundulators with a 6 mm period, built from axially magnetized helices fabricated from a single piece of rare-earth magnet. The first device, composed of two oppositely magnetized longitudinal helices, produces a transverse on-axis field exceeding 0.93 T. The second, a hybrid design with two oppositely longitudinally pre-magnetized rare-earth helices alternating with two unmagnetized steel helices, reaches about 1.5 T on axis. Both devices have a 1 mm bore, which required dedicated field-measurement techniques. When used in compact FELs from terahertz to X-ray, such microundulators can provide higher electron oscillation amplitude and radiated power than planar microundulators of similar period. As an illustrative case, we present an ultra-compact SASE XFEL concept in which the studied hybrid helical microundulator can provide approximately 48 GW of radiation power at a wavelength of about 5 angstrom. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06186 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Implementation of Prototype Permanent Microundulators Magory, Eyal Bratman, Vladimir L. Steiner, Ahiya Balal, Nezah Instrumentation and Detectors We report the implementation of two types of helical microundulators with a 6 mm period, built from axially magnetized helices fabricated from a single piece of rare-earth magnet. The first device, composed of two oppositely magnetized longitudinal helices, produces a transverse on-axis field exceeding 0.93 T. The second, a hybrid design with two oppositely longitudinally pre-magnetized rare-earth helices alternating with two unmagnetized steel helices, reaches about 1.5 T on axis. Both devices have a 1 mm bore, which required dedicated field-measurement techniques. When used in compact FELs from terahertz to X-ray, such microundulators can provide higher electron oscillation amplitude and radiated power than planar microundulators of similar period. As an illustrative case, we present an ultra-compact SASE XFEL concept in which the studied hybrid helical microundulator can provide approximately 48 GW of radiation power at a wavelength of about 5 angstrom. |
| title | Implementation of Prototype Permanent Microundulators |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2509.06186 |