Journal
NEW JOURNAL OF PHYSICS
Volume 18, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/11/113045
Keywords
inverse free electron laser; THz waveguide; electron beam manipulation; submillimeter wave instrumentation; electron beam compression; streaking diagnostic
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Funding
- US Department of Energy [DE-SC0009914]
- National Science Foundation [PHY-1415583]
- US-Israel Binational Science Foundation (BSF), Jerusalem, Israel
- U.S. Department of Energy (DOE) [DE-SC0009914] Funding Source: U.S. Department of Energy (DOE)
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We describe an inverse free electron laser (IFEL) interaction driven by a near single-cycle THz pulse that is group velocity-matched to an electron bunch inside a waveguide, allowing for a sustained interaction in a magnetic undulator. We discuss the application of this guided-THz IFEL technique for compression of a relativistic electron bunch and synchronization with the external laser pulse used to generate the THz pulse via optical rectification, as well as a laser-driven THz streaking diagnostic with the potential for femtosecond scale temporal resolution. Initial measurements of the THz waveform via an electro-optic sampling based technique confirm the predicted reduction of the group velocity, using a curved parallel plate waveguide, as a function of the varying aperture size of the guide. We also present the design of a proof-of-principle experiment based on the bunch parameters available at the UCLA PEGASUS laboratory. With a 10 MV m(-1) THz peak field, our simulation model predicts compression of a 6 MeV 100 fs electron beam by nearly an order of magnitude and a significant reduction of its initial timing jitter.
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