title: Photon transport of the superradiant TeraFERMI THz beamline at the FERMI free-electron laser.
abstract: TeraFERMI is the new terahertz (THz) beamline for pump-probe studies on the femtosecond time-scale, under construction at the FERMI free-electron laser (FEL) facility in Trieste, Italy. The beamline will take advantage of the coherent radiation emitted by the spent electrons from the FEL undulators, before being dumped. This will result in short, coherent, high-power THz pulses to be used as a pump beam, in order to modulate structural properties of matter, thereby inducing phase transitions. The TeraFERMI beamline collects THz radiation in the undulator hall and guides it along a beam pipe which is approximately 30 m long, extending across the safety hutch and two shielding walls. Here the optical design, which will allow the efficient transport of the emitted THz radiation in the experimental hall, is presented.
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Cristian
authors.initials: C
authors.lastname: Svetina
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Mahne
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Raimondi
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Perucchi
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Di Pietro
authors.affiliation: INSTM Udr Trieste-ST, Trieste, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Lupi
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmidt
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Trieste 34149, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Zangrando
keywords: FERMI free-electron laser; TeraFERMI; coherent transition radiation (CTR); free electron laser (FEL); terahertz beamline