Suppression of pair beam instabilities in a laboratory analogue of blazar pair cascades
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Arrowsmith, Charles D. Miniati, Francesco Bilbao, Pablo J. Simon, Pascal Bott, Archie F. A. Burger, Stephane Chen, Hui Cruz, Filipe D. Davenne, Tristan Dyson, Anthony Efthymiopoulos, Ilias Froula, Dustin H. Goillot, Alice Gudmundsson, Jon T. Haberberger, Dan Halliday, Jack W. D. Hodge, Tom Huffman, Brian T. Iaquinta, Sam Marshall, G. Reville, Brian Sarkar, Subir Schekochihin, Alexander A. Silva, Luis O. Simpson, Raspberry Stergiou, Vasiliki Trines, Raoul M. G. M. Vieu, Thibault Charitonidis, Nikolaos Bingham, Robert Gregori, Gianluca |
| author_facet | Arrowsmith, Charles D. Miniati, Francesco Bilbao, Pablo J. Simon, Pascal Bott, Archie F. A. Burger, Stephane Chen, Hui Cruz, Filipe D. Davenne, Tristan Dyson, Anthony Efthymiopoulos, Ilias Froula, Dustin H. Goillot, Alice Gudmundsson, Jon T. Haberberger, Dan Halliday, Jack W. D. Hodge, Tom Huffman, Brian T. Iaquinta, Sam Marshall, G. Reville, Brian Sarkar, Subir Schekochihin, Alexander A. Silva, Luis O. Simpson, Raspberry Stergiou, Vasiliki Trines, Raoul M. G. M. Vieu, Thibault Charitonidis, Nikolaos Bingham, Robert Gregori, Gianluca |
| contents | The generation of dense electron-positron pair beams in the laboratory can enable direct tests of theoretical models of $γ$-ray bursts and active galactic nuclei. We have successfully achieved this using ultra-relativistic protons accelerated by the Super Proton Synchrotron at CERN. In the first application of this experimental platform, the stability of the pair beam is studied as it propagates through a metre-length plasma, analogous to TeV $γ$-ray induced pair cascades in the intergalactic medium. It has been argued that pair beam instabilities disrupt the cascade, thus accounting for the observed lack of reprocessed GeV emission from TeV blazars. If true this would remove the need for a moderate strength intergalactic magnetic field to explain the observations. We find that the pair beam instability is suppressed if the beam is not perfectly collimated or monochromatic, hence the lower limit to the intergalactic magnetic field inferred from $γ$-ray observations of blazars is robust. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_09040 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Suppression of pair beam instabilities in a laboratory analogue of blazar pair cascades Arrowsmith, Charles D. Miniati, Francesco Bilbao, Pablo J. Simon, Pascal Bott, Archie F. A. Burger, Stephane Chen, Hui Cruz, Filipe D. Davenne, Tristan Dyson, Anthony Efthymiopoulos, Ilias Froula, Dustin H. Goillot, Alice Gudmundsson, Jon T. Haberberger, Dan Halliday, Jack W. D. Hodge, Tom Huffman, Brian T. Iaquinta, Sam Marshall, G. Reville, Brian Sarkar, Subir Schekochihin, Alexander A. Silva, Luis O. Simpson, Raspberry Stergiou, Vasiliki Trines, Raoul M. G. M. Vieu, Thibault Charitonidis, Nikolaos Bingham, Robert Gregori, Gianluca High Energy Astrophysical Phenomena Plasma Physics The generation of dense electron-positron pair beams in the laboratory can enable direct tests of theoretical models of $γ$-ray bursts and active galactic nuclei. We have successfully achieved this using ultra-relativistic protons accelerated by the Super Proton Synchrotron at CERN. In the first application of this experimental platform, the stability of the pair beam is studied as it propagates through a metre-length plasma, analogous to TeV $γ$-ray induced pair cascades in the intergalactic medium. It has been argued that pair beam instabilities disrupt the cascade, thus accounting for the observed lack of reprocessed GeV emission from TeV blazars. If true this would remove the need for a moderate strength intergalactic magnetic field to explain the observations. We find that the pair beam instability is suppressed if the beam is not perfectly collimated or monochromatic, hence the lower limit to the intergalactic magnetic field inferred from $γ$-ray observations of blazars is robust. |
| title | Suppression of pair beam instabilities in a laboratory analogue of blazar pair cascades |
| topic | High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2509.09040 |