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Transition between Instability and Seeded Self-Modulation of a Relativistic Particle Bunch in Plasma

Journal Article · · Physical Review Letters
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We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of a long proton bunch in plasma. We show experimentally that, with sufficient initial amplitude [ ≥ ( 4.1 ± 0.4) MV / m ], the phase of the modulation along the bunch is reproducible from event to event, with 3%–7% (of 2 π ) rms variations all along the bunch. The phase is not reproducible for lower initial amplitudes. We observe the transition between these two regimes. Phase reproducibility is essential for deterministic external injection of particles to be accelerated.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Deutsches Elektronen-Synchrotron (DESY); European Union (EU); German Federal Ministry of Education and Research; German Research Foundation (DFG); National Research Foundation of Korea; National Science Foundation (NSF); Portuguese Foundation for Science and Technology (FCT); Research Council of Norway; Science and Technology Facilities (STFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
AWAKE Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1810116
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 126; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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