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Title: Observation of the Self-Modulation Instability via Time-Resolved Measurements

Self-modulation of an electron beam in a plasma has been observed. The propagation of a long (several plasma wavelengths) electron bunch in an overdense plasma resulted in the production of multiple bunches via the self-modulation instability. Using a combination of a radio-frequency deflector and a dipole spectrometer, the time and energy structure of the self-modulated beam was measured. The longitudinal phase space measurement showed the modulation of a long electron bunch into three bunches with an approximately $$200\text{ }\text{ }\mathrm{keV}/c$$ amplitude momentum modulation. Demonstrating this effect is a breakthrough for proton-driven plasma accelerator schemes aiming to utilize the same physical effect.
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  1. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg (Germany)
  4. Helmholtz-Zentrum Berlin for Materials and Energy (Germany)
  5. Univ. of Hamburg (Germany); Inst. Superior Técnico (IST), Lisbon (Portugal)
  6. CNRS Ecole Polytechnique, Palaiseau (France). Lab. Leprince-Ringuet (LLR)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Univ. of Hamburg (Germany); Center for Free-Electron Laser Science, Hamburg (Germany)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 05H12GU6
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 14; Journal ID: ISSN 0031-9007
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany); Univ. of Hamburg (Germany)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); German Federal Ministry of Education and Research (BMBF)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 43 PARTICLE ACCELERATORS; plasma acceleration & new acceleration techniques; plasma-beam interactions
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1439240