Speaker
Description
In AWAKE, the wakefields - and therefore the accelerating gradient - are generated through the self-modulation of a long, 400GeV proton bunch from the SPS. We present here the first experimental measurement of the event-to-event reproducibility of the wakefield amplitude produced by the self-modulation process.
Using two independent diagnostics, i.e., rms size of the bunch downstream of the plasma, and local plasma light emission [1], we find that when SM is seeded, variations of these two parameters are small, suggesting that variations of the amplitude of the wakefields are also small. Moreover, we find that the relative event-to-event variations are smaller at saturation than during growth. This is consistent with previous numerical simulation results [2].
These results demonstrate that seeding does not only make the phase of the wakefields reproducible from event-to-event [3], but also their amplitude, a key requirement for producing high-quality accelerated bunches with this acceleration scheme.
Footnotes
- Mezger, J. et al., NIMA, 2025, 170426
** Moreira, M. et al., PRAB, 2019, 031301
*** Batsch, F. et al. (AWAKE collaboration), PRL, 2021, 164802
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