WP18: TA13 – Trans-national Access to FELIX
Provision of access to the following infrastructure(s): FELIX – Free Electron Laser for Infrared Experiments
Description of the infrastructure
The FELIX facility is composed of two independent accelerators that together comprise four Free Electron Lasers (FELs) – FLARE, FELIX-1, FELIX-2 and FELICE.
The output of FELIX (3 – 150 μm) consists of a few-μs long burst (macropulse) of micropulses. The maximum macropulse repetition rate is 10 Hz while the micropulse repetition rate can be either 25 or 1000 MHz. Important specifications are: continuous tuning over an octave in less than a minute, optical pulses of minimum six cycles (200 fs pulse duration at 1000 cm-1) with peak intensities of 100 MW and maximum 100 cycles (bandwidth 0.4% FWHM), temporal/transverse beam profile close to transform/diffraction limited.
The primary applications at FELIX are in areas benefitting either from the high brightness or the high fluence of the lasers. Studies on saturation-relaxation phenomena make use of the high peak powers to investigate a variety of samples ranging from solid state to biological systems. The FELIX output has some unique features that make it highly suitable for IR-spectroscopy of (bio)molecules, complexes and clusters in the gas phase. These “action spectroscopy techniques” provide structural information that is difficult if not impossible to obtain otherwise. Unique opportunities are offered to users by the coupling of the FELIX beam lines to the high field DC magnets of the neighboring High Field Magnet Laboratory enabling experiments combining infrared and THz radiation with magnetic fields of up to 38 T (45 T in 2017).
FLARE provides powerful pulsed light in the terahertz part of the spectrum between 200 GHz (λ=1.5 mm) and 3 THz (λ =100 μm). It generates light in trains of micropulses each of a length of 10 to 100 ps (depending on the wavelength) with a repetition rate of 3 GHz or 20 MHz.
FELICE is a unique beam line dedicated to intra-cavity experiments and enables studies with unprecedented photon flux in the infrared and THz regime. It generates radiation tunable in the 5 to 100 μm region, with an intra-cavity energy of more than a Joule in a few μs duration burst of picosecond pulses. Two dedicated intra-cavity setups are included in the optical cavity. The unique features of FELICE open new possibilities in the fields of atomic, molecular and optical physics.
|Name of the infrastructure (and
its installations, if applicable)
|Location of the infrastructure||Nijmegen, THE NETHERLANDS|
|Services currently offered by the infrastructure||The total wavelength coverage of the four FELs of the FELIX installation is 3 – 1500 μm (3300 – 6 cm-1 or 1,000 – 0.2 THz). Three beamlines are operated simultaneously at a repetition rate of 10 Hz so that three user groups can perform experiments in parallel on FLARE, FELIX and FELICE. For FLARE and FELIX an evacuated transport system directs the optical beam to one of the twelve user stations, many of which contain dedicated advanced setups as well as ancillary equipment. For example:
On FELICE both experimental setups are open to users.
Modality of access & application procedure
|Modality of access||Calls for proposal:
The FELIX facility opens two calls for applications per year. Users submit their projects either directly to the FELIX website or via the wayforlight.eu portal using the Standard Proposal Form (SPF). An external committee evaluates the proposals based on scientific merit. The facility manager communicates the allotted amount of beamtime and arranges the schedule during the mutually agreed time period.
The amount of beamtime varies with the type of experiment; on average user groups visit for one to two weeks and receive three to eight shifts. The experimental details and the requested equipment are planned with the responsible local contact. The lasers at FELIX operate in two shifts of 7.5 hours per day and 5 days/week.
|Offered support||A broad expertise in experimental techniques applicable in the (F)IR and THz regime is available at the FELIX Laboratory, as illustrated by the fact that most of the permanent experimental setups were developed by the in-house scientists. The in-house groups have extensive expertise in the fields of molecular, solid-state, and laser physics.
More information about the Trans-national Access funding by FELIX you will find here.
|Outreach to new users||Beamline data sheets are also available on wayforlight.eu. Find more information about the infrastructure FELIX@wayforlight.eu and FELIX’s four FELs@wayforlight.eu.
|Review procedure||The proposals are reviewed by the FELIX Programme Advisory Committee (PAC) composed of six renowned scientists covering various scientific fields. The PAC meets at least once a year physically in Nijmegen at the FELIX Laboratory.