WP6: TA1 – Trans-national Access to ELBE
Provision of access to the following infrastructure(s): ELBE
Description of the infrastructure
The core of the ELBE Center for High-Power Radiation Sources is the 40 MeV superconducting electron accelerator ELBE (Electron Linear accelerator with high Brilliance and low Emittance), generating a variety of secondary radiations like MeV Bremsstrahlung, neutrons and positrons and feeding two free electron lasers (called FELBE) with wavelength ranges from 4µm to 25 µm and 20µm to 250µm, respectively.
These are the only FELs in Europe open to users providing a continuous pulse train (cw mode) at MHz repetition rate (13 MHz). In addition two beamlines are providing high-power coherent terahertz radiation between 0.1 and 3 THz at 100 kHz repetition rate (TELBE). Roughly 40% of the total beamtime is given to the IR and THz beams. The average power of FELBE is in the range of tens of Watts, corresponding to pulse energies of a few μJ and peak powers of the order of 1 MW. The pulse duration depends strongly on the wavelength and ranges from sub-ps to several tens of ps. FELBE can be operated in cw mode, in a macrobunch (burst) mode or with a reduced 1 kHz repetition rate achieved using a semiconductor plasma switch. The cw operation distinguishes FELBE from the other two infrared free-electron laser facilities which are open for external users in Europe, FELIX in The Netherlands and CLIO in France. This mode is most suitable for two-color experiments with tabletop lasers with repetition rates between 10-100 MHz.
The combination of FELBE and the Dresden High Magnetic Field Laboratory (HLD) enables worldwide unique experiments with free electron laseer (FEL) in a pulsed magnetic field of up to 70 T (in 100+ ms pulses). The low-frequency THz facility TELBE provides coherent, high-field THz radiation with either full 100% bandwidth from a diffraction radiator or ~20% bandwidth from an 8-period undulator. Pulse energies up to 100 μJ will be reached, enabling THz field strengths up to MV/cm.
Seven optical laboratories dedicated to time-resolved studies as well as near-field microscopy are available for users. The laboratories are equipped with fs and ps laser oscillators, a parametric oscillator, parametric amplifiers (1 kHz and 250 kHz systems) and set-ups for broad-band THz radiation. All these sources are synchronized to ELBE. Set-ups exist for single-color and two-color pump-probe and four-wave mixing spectroscopy as well as for scattering near-field microscopy (s-SNOM). Furthermore a synchro-scan streak camera for time resolved luminescence studies, an 8 T split-coil magnet, and different Fourier transform spectrometers are available.
|Name of the infrastructure (and
its installations, if applicable)
|ELBE Center for High-Power Radiation Sources, consisting of
|Location of the infrastructure||Dresden, GEMANY|
|Services currently offered by the infrastructure||Both FELs, the THz beamlines as well as the optical laboratories are at the disposal of the users.
Modality of access & application procedure
|Modality of access||Access to the infrastructure is quality-based and relies on a peer-review procedure based on research proposals. The primary selection criteria is scientific excellence. Among scientifically equally ranked proposals priority is given to users from countries without national FEL and from EU-13 states, to PhD students and to women PIs.
Calls for proposal:
Calls for proposals are published twice per year, proposals are submitted electronically using the portal HZDR GATE. Submission using the Standardized Proposal Format (SPF) as described in “WP2 – NA1 – User tools for access and data management is” strongly encouraged.
ELBE is operated 24 h, 7 days/week, beamtime is granted in units of 12 hours. Accounting of the access provided is based on hours of usable beamtime (as judged by the user); access costs are declared using the unit cost model. Support for setting up the experiment is provided in-kind; however, users are reimbursed for the additional costs for accommodation.
|Outreach to new users||
|Review procedure||Proposals for beamtimes are evaluated by an international Scientific Advisory Committee which is composed of 13 renowned scientists, seven of whom are experts in FEL and IR/THz spectroscopy. These experts from five different European countries constitute the user selection panel under CALIPSOplus.