Verra, L;
Wyler, S;
Nechaeva, T;
Pucek, J;
Bencini, V;
Bergamaschi, M;
Ranc, L;
... Zepp, M; + view all
(2023)
Development of the self-modulation instability of a relativistic proton bunch in plasma.
Physics of Plasmas
, 30
(8)
, Article 083104. 10.1063/5.0157391.
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Abstract
Self-modulation is a beam–plasma instability that is useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results showing that, when increasing the ratio between the initial transverse size of the bunch and the plasma skin depth, the instability occurs later along the bunch, or not at all, over a fixed plasma length because the amplitude of the initial wakefields decreases. We show cases for which self-modulation does not develop, and we introduce a simple model discussing the conditions for which it would not occur after any plasma length. Changing bunch size and plasma electron density also changes the growth rate of the instability. We discuss the impact of these results on the design of a particle accelerator based on the self-modulation instability seeded by a relativistic ionization front, such as the future upgrade of the Advanced WAKefield Experiment.
| Type: | Article |
|---|---|
| Title: | Development of the self-modulation instability of a relativistic proton bunch in plasma |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0157391 |
| Publisher version: | https://doi.org/10.1063/5.0157391 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Physics, Fluids & Plasmas, Physics, DYNAMICS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10176376 |
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