Abstract
TeraFERMI is the THz beamline at the FERMI free-electron-laser facility in Trieste (Italy). It uses superradiant Coherent Transition Radiation emission to produce THz pulses of 10 to 100 μ J intensity over a spectral range which can extend up to 12 THz. TeraFERMI can be used to perform non-linear, fluence-dependent THz spectroscopy and THz-pump/IR-probe measurements. We describe in this paper the optical set-up based on electro-optic-sampling, which is presently in use in our facility and discuss the properties of a representative THz electric field profile measured from our source. The measured electric field profile can be understood as the superimposed emission from two electron bunches of different length, as predicted by electron beam dynamics simulations.
Highlights
The interest in high power pulsed THz sources has seen a steady increase during the last decade
We describe in this paper the optical set-up based on electro-optic-sampling, which is presently in use in our facility and discuss the properties of a representative THz electric field profile measured from our source
The THz photons emitted by a Coherent Transition Radiation (CTR) source are propagated along the THz beamline into the FERMI experimental hall, where the THz light is delivered to a dedicated laboratory
Summary
The interest in high power pulsed THz sources has seen a steady increase during the last decade. Single pass accelerators can store high charge in sub-ps bunches For this reason, their use for THz control of matter is becoming widespread [3,4,5,6,7,8,9]. The measured electric field profile is compatible with the emission from a 100 fs-long current spike in the bunch head of the ps-long entire electron bunch, as previously predicted by electron beam dynamics simulations [12] The presence of this current spike is due to Coherent Synchrotron Radiation (CSR) wakefields in the dump line and is the origin of the multi-THz emission at TeraFERMI even in the absence of a sub-ps compression of the total electron bunch
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