High-Field High-Repetition-Rate Terahertz facility @ ELBE (TELBE)

THz induced spinwave in NiO

As part of an upgrade of the ELBE accelerator one electron beamline has been modified to allow for the generation and acceleration of ultra short (< 150 fs) highly charged (up to 1 nC) electron bunches. This upgrade enables the operation of High-Field THz sources based on superradiant THz emission at the ELBE accelerator and thereby opens up the opportunity to generate carrier-envelope phase stable high-field THz pulses with extremely flexible paramaters with respect to repetition rate, pulse form and polarization.  Since 2014 the fs electron beamline and the pilot-TELBE facility have been taken into operation and have been comissioned aiming to achieve the following design parameters:

Radiator type  Electron charge / pC Repetition rate / kHz  Pulse energy / μJ  Bandwidth / % number of Field cyles   Timing / fs Frequency range / THz
  Undulator < 100  =< 1.3 x 104 1  ~20 8 < 30 (FWHM) 0.1 - 3 (tunable by user)
< 1000  =< 500 100  ~20 8 < 30 (FWHM) 0.1 - 3 (tunable by user)

Diffraction radiator

< 100  =< 1.3 x 104 0.25 100 1 < 30 (FWHM) 0.1 - 3
< 1000 =< 500 25 100 1 < 30 (FWHM) 0.1 - 3

Pulses from both radiator types are transported into a dedicated, climatized laser laboratory which is equipped with the following infrastructure:

  • fs laser-amplifyier system 1: COHERENT RegA 9000THz Laborneu
  • fs laser-amplifyier system 2: COHERENT Legend Elite
  • FTIR spectrometer: BRUKER 80V
  • 10 T split-coil magnet with optical access: OXFORD INSTRUMENTS SPECIAL SM4000-10
  • 2 x High-Field THz pump probe set-ups based on optical rectification
  • ONLINE Pulse-to-pulse THz diagnostic endstation (fs arrivaltime, THz - spectrum & pulse energy,....)*
  • TR - Faraday rotation endstation*
  • TR - THz emission endstation*
  • THz TELBE pump THz probe endstation*
  • TR - Scattering-type nearfield microscopy [1]*

* under development by the THODIAC collaboration

NOTE! the currently achievable parameters are [2]:

Radiator type   Electron charge / pC Repetition rate / kHz  Pulse energy / μJ Bandwidth / %   Number of field cycles  Timing / fs  Frequency range / THz
Undulator  100  100  <= 1  20  8  < 30  0.1 - 1.1
Diffraction Radiator  100  100  <=0.25  100  1  < 30  0.1 - 1.1

TELBE is open for proposals for in total 25 shifts in "friendly user operation" mode in the 1st semester of 2017. The beamtime will be scheduled in 2 compact beamtime blocks. The first beamtime block will be between 20.3. - 27.3.2017 the second beamtime block will be 08.5. - 15.5.2017.

Contact:

Dr. Sergey Kovalev (Multi-color pump-probe, TELBE - Laser synchronization) 

Dr. Michael Gensch (TELBE experiments, ARD test facility)

[1] F. Kuschewski et. al., "Optical Nanoscopy of transient states of Matter", Scientific Reports 5 (2015), 12582.

[2] B. Green et. al., "High-field High-repetition-rate Sources for the Coherent THz Control of Matter", Scientific Reports 6 (2016), 22256.