THODIAC - THz Photondiagnostic collaboration


The THz photondiagnostic collaboration (THODIAC) is a collaboration of accelerator scientists as well as users of high-field THz radiation and worked on the efficient commissioning of the super-radiant THz sources at ELBE. The super-radiant THz sources at ELBE represent, together with the planned Laser-electron interaction experiments, the first application of ELBE that required a femto-second level control of electron bunch properties such as arrivaltime or form. This much higher demands on the accelerator performance made intensive research and developement of new diagnostic electron bunch diagnostic concepts inevitable. In particular since ELBE is one of the first accelerators world-wide which is operated in a quasi-cw mode of operation and many conventional technical solutions from other accelerators can not readily be adpated. TELBE is since 2014 operated  as an HGF - Accelerator Research Developement Test facility for electron bunch diagnostic on quasi-cw accelerators. Since the 2nd semester of 2016 its is also operated with preliminary parameters as THz user facility despite the fact that the TELBE design parameters have still not been achieved [1]. The required few 10 fs time resolution has been achieved through collaborative work within the THODIAC collaboration which led to the development of a novel pulse-resolved detection scheme [2]. THODIAC continues to be active pushing the limits of the pulse-resolved detection schemes towards operation at MHz repetition rates and sub 1 fs time resolution. THODIAC also aims at implementing novel duty-cycle hungry probe techniques such as time-resolved ARPES or time-resolved nearfield microscopy at TELBE.

[1] S. Kovalev et al., "Probing ultra-fast processes with high dynamic range at 4th-generation light sources: Arrival time and intensity binning at unprecedented repetition rates", Struct. Dyn. 4 (2017), 024301

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