13.02.2018

New laser-based facility for NFFA-Trieste

The novel NFFA-SPRINT facility (Spin Polarized Research Instrument in the Nanoscale and Time domain) is located in a new dedicated hutch-suite in the FERMI@Elettra hall, and has been developed in collaboration between IOM-CNR and T-Rex (Elettra) laboratories.

Users are invited to submit proposals via the Trieste.NFFA.eu (apply for access button on the main page of this website) as well as via the T-Rex webpage (http://www.elettra.eu/lightsources/labs-and-services/t-rex/info-for-users.html). Access via the NFFA-Trieste web-portal will be implemented from March 2018.

We invite users and collaborators to discuss their proposals with the beamline local contacts well in advance of the submission deadline. This is crucial for a careful assessment of the experiment feasibility and may result in an improvement of the proposal.

The SPRINT facility is designed to provide  pump-probe photoelectron spectroscopy (ARPES and Spin Polarimetry) experiments. The High Harmonics Generation (HHG) beamline is based on a PHAROS laser, providing 20 W, 400 mJ pulses @ 50 kHz, with a tunable repetition rate from single shot to 1 MHz and a pulse duration around 290 fs.  90% of this radiation is used to generate high harmonics in gases (Ar and Ne), covering the energyrange between 17 to 76 eV, with high photons flux, up to 10^12 photons/seconds @ 27 eV, 50 kHz, and allowing very good generation also @ 200 kHz. The remaining 10% can be used to pump two Optical Parametric Amplifiers (OPA), in the range 630 nm-16000 nm, used for pump/probe measurements.

The facility is connected with two end station for Time resolved-ARPES (T-ReX group) and Spin polarimetry (SPRINT).

The SPRINT end station is a stand-alone spectrometer for UV and soft X-ray time-resolved photoelectron spectroscopy, readily moveable to FEL sources, but routinely available for users at NFFA-SPRINT. A Scienta SES-2002 electron spectrometer devoted to PES and ARPES is presently equipped with a phosphor  detector and CCD camera, and will be soon upgraded with a crossed delay-line detector (developed by Elettra Detector group) to allow pump-probe experiments. A reference statistical VUV source, a resonant HeI-II lamp, provides 21.2 eV and 40.8 eV light for reference photoemission spectra and resolution tests. Cryogenic temperature control (down to 40 K) is implemented. The samples are prepared in the annex sample preparation module that will also receive samples grown and characterized at NFFA-Trieste APE stations via a UHV shuttle.

The commissioning phase of the HHG beamline has started in January 2018, and a summary of the actual performancesand test results is presented in this file.

 

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