Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets
Tightly focused proton beams generated from helical coil targets have been shown to be highly collimated across small distances, and display characteristic spectral bunching. We show, for the first time, proton spectra from such targets at high resolution via a Thomson parabola spectrometer. The pro...
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2024-01-01
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| Series: | High Power Laser Science and Engineering |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S2095471924000641/type/journal_article |
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| author | P. Martin H. Ahmed O. Cavanagh S. Ferguson J. S. Green B. Greenwood B. Odlozilik M. Borghesi S. Kar |
| author_facet | P. Martin H. Ahmed O. Cavanagh S. Ferguson J. S. Green B. Greenwood B. Odlozilik M. Borghesi S. Kar |
| author_sort | P. Martin |
| collection | DOAJ |
| description | Tightly focused proton beams generated from helical coil targets have been shown to be highly collimated across small distances, and display characteristic spectral bunching. We show, for the first time, proton spectra from such targets at high resolution via a Thomson parabola spectrometer. The proton spectral peaks reach energies above 50 MeV, with cutoffs approaching 70 MeV and particle numbers greater than 10
${}^{10}$
. The spectral bunch width has also been measured as low as approximately 8.5 MeV (17% energy spread). The proton beam pointing and divergence measured at metre-scale distances are found to be stable with the average pointing stability below 10 mrad, and average half-angle beam divergences of approximately 6 mrad. Evidence of the influence of the final turn of the coil on beam pointing over long distances is also presented, corroborated by particle tracing simulations, indicating the scope for further improvement and control of the beam pointing with modifying target parameters. |
| format | Article |
| id | doaj-art-6bee7d5cb45b4a258be0b74011881974 |
| institution | Kabale University |
| issn | 2095-4719 2052-3289 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | High Power Laser Science and Engineering |
| spelling | doaj-art-6bee7d5cb45b4a258be0b740118819742025-01-16T21:51:27ZengCambridge University PressHigh Power Laser Science and Engineering2095-47192052-32892024-01-011210.1017/hpl.2024.64Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targetsP. Martin0https://orcid.org/0000-0002-0928-7445H. Ahmed1https://orcid.org/0000-0002-2151-8971O. Cavanagh2S. Ferguson3J. S. Green4B. Greenwood5B. Odlozilik6M. Borghesi7https://orcid.org/0000-0001-9165-0073S. Kar8https://orcid.org/0000-0002-9406-3103Centre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK Central Laser Facility, Rutherford Appleton Laboratory, Didcot, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentral Laser Facility, Rutherford Appleton Laboratory, Didcot, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKCentre for Light-Matter Interactions, School of Mathematics and Physics, Queen’s University Belfast, Belfast, UKTightly focused proton beams generated from helical coil targets have been shown to be highly collimated across small distances, and display characteristic spectral bunching. We show, for the first time, proton spectra from such targets at high resolution via a Thomson parabola spectrometer. The proton spectral peaks reach energies above 50 MeV, with cutoffs approaching 70 MeV and particle numbers greater than 10 ${}^{10}$ . The spectral bunch width has also been measured as low as approximately 8.5 MeV (17% energy spread). The proton beam pointing and divergence measured at metre-scale distances are found to be stable with the average pointing stability below 10 mrad, and average half-angle beam divergences of approximately 6 mrad. Evidence of the influence of the final turn of the coil on beam pointing over long distances is also presented, corroborated by particle tracing simulations, indicating the scope for further improvement and control of the beam pointing with modifying target parameters.https://www.cambridge.org/core/product/identifier/S2095471924000641/type/journal_articlelaserprotonhelical coil |
| spellingShingle | P. Martin H. Ahmed O. Cavanagh S. Ferguson J. S. Green B. Greenwood B. Odlozilik M. Borghesi S. Kar Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets High Power Laser Science and Engineering laser proton helical coil |
| title | Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets |
| title_full | Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets |
| title_fullStr | Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets |
| title_full_unstemmed | Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets |
| title_short | Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets |
| title_sort | multi parametric characterization of proton bunches above 50 mev generated by helical coil targets |
| topic | laser proton helical coil |
| url | https://www.cambridge.org/core/product/identifier/S2095471924000641/type/journal_article |
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