High field THz sources operating at 100 kHz Repetition rates: Challenges and Opportunities

Picosecond long transients of electric and magnetic fields in combination with repetition rates in the few 100 kHz to even MHz regime is crucial to understand several recently observed fascinating nonequilibrium phenomena driven by THz excitations. A new class of compact accelerator based THz sources based on super-radiant amplification of radiation from ultra-short electron bunches allows to generate high field THz pulses at unprecedented repetition rates. First measurements at a prototype facility proof the feasibility of the approach and demonstrate already parameters which exceeds laser-based sources by more than 2 orders of magnitude. Results from first pilot experiments aiming at investigating THz driven magnetization dynamics in MnGa, NiO and YIG are discussed and an outlook into the opportunities for High-field THz science at the future TELBE user facility is given.