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Phase-stable self-modulation of an electron-beam in a magnetic wiggler

Conference ·
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Electron-beams with a sinusoidal energy modulation have the potential to emit sub-femtosecond x-ray pulses in a free-electron laser. The energy modulation can be generated by overlapping a powerful infrared laser with an electron-beam in a magnetic wiggler. Here we report on a new infrared source for this modulation, coherent radiation from the electron-beam itself. In this self-modulation process, the current spike on the tail of the electron-beam radiates coherently at the resonant wavelength of the wiggler, producing a six-period carrier-envelope-phase (CEP) stable infrared field with gigawatt power. This field creates a few MeV, phase-stable modulation in the electron-beam core. The modulated electron-beam is immediately useful for generating sub-femtosecond x-ray pulses at any machine repetition rate, and the CEP-stable infrared field may find application as an experimental pump or timing diagnostic.
Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
U.S. Department of Energy (Office not specified); USDOE Office of Science - Office of Basic Energy Sciences; USDOE Office of Science; National Science Foundation (NSF)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1607464
Country of Publication:
United States
Language:
English

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Tunable isolated attosecond X-ray pulses with gigawatt peak power from a free-electron laser journal December 2019

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wiggler