Sep 15 – 21, 2019
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

THz streaking of ultrashort electron bunches

Sep 18, 2019, 6:00 PM
SB1 (Hotel Hermitage)


Hotel Hermitage

talk WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures WG3 - Thz acceleration


Thomas Feurer (University of Bern)


Recently, we proposed to use building blocks of THz metamaterials for streaking of ultrashort electron bunches. Such building blocks allow for a precise control of the electric and magnetic near-field distribution in a volume that is defined by the geometry of the structure. THz radiation with wavelengths on the order of a hundred micron is well matched to the transverse and longitudinal size of typical electron bunches in advanced accelerators. Moreover, today’s pulsed THz sources provide field strengths up to hundreds of MV/m and thus become competitive with standard microwave sources. When combined with structures featuring high values of either electric or magnetic field enhancement, the maximum field strength can even be ten to a hundred fold higher.

Here, the streaking device is a split ring resonator loaded by a single cycle THz pulse. Electron bunches passing through the resonator’s gap experience a transverse momentum kick which sign and magnitude depends on the longitudinal bunch position. Thus, the longitudinal bunch density is mapped onto the transverse axis and can be measured with a spatially resolved electron detector. Detailed simulations and experimental results are presented for the 3 MeV ultrafast electron diffraction facility at KAERI.

Primary authors

David Rohrbach (University of Bern) Hyun Woo Kim (KAERI) In Hyung Baek (KAERI) Key Young Oang (KAERI) Kyu-Ha Jang (KAERI) Mi Hye Kim (KAERI) Mozhgan Hayati (University of Bern) Roxana Tarkeshian (Universität Bern) Thomas Feurer (University of Bern) Young Chan Kim (KAERI) Young Uk Jeong (KAERI) Zoltan Ollmann (University of Bern)

Presentation materials