24-30 September 2017
La Biodola, Isola d'Elba
Europe/Rome timezone

Group and phase velocity matching in THz IFEL interaction

28 Sep 2017, 18:30
SB2, Sala Bonaparte 2, HH

SB2, Sala Bonaparte 2, HH

talk WG3 - Electron Beams from Electromagnetic Structures, Including Dielectric and Laser-driven Structures WG3_Parallel


Emma Curry (UCLA)


We review results from the recent guided-THz IFEL experiment at the UCLA PEGASUS facility. Using a parallel plate waveguide, the group velocity of a near-single cycle THz pulse was reduced to match electron beam propagation in an undulator, resulting in a ponderomotive interaction sustained for 30 cm. With a 1 uJ THz pulse obtained by optical rectification in a LN source, the projected beam energy distribution increased from a full peak width of 30 keV to more than 100 keV. When using a long (multi-ps) electron beam, longitudinal phase space measurements reveal the snake-like energy modulation from the ps-scale THz pulse. Using a short beam configuration, we also measure bunch compression, limited by the available drift length to a factor of two. Finally, we explore the application of this technique to amplification of the THz seed using the 1-D multi-frequency simulation code we have developed for this novel zero-slippage interaction scheme.

Primary author

Emma Curry (UCLA)


Prof. Avraham Gover (Tel Aviv University) Prof. Pietro Musumeci (UCLA) Siara Fabbri (UCLA)

Presentation Materials