[Triumf-seminars] TRIUMF Seminar today at 13:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Fri Jul 7 05:00:00 PDT 2017


Date/Time: Fri 2017-07-07 at 13:00

Location:  ISAC-II Conf Room   

Speaker:   Michael Gensch (Helmholtz Zentrum Dresden-Rossendorf)

Title:     High-Field High-Repetition-Rate superradiant THz Sources for Selective THz Control of Matter

Abstract: The past 10 years have seen a growing number of THz sources coming into operation worldwide that are based on superradiant emission from ultra-short highly charged electron bunches [1]. The superradiant principle allows generating carrier-envelope stable THz pulses with high pulse energy and a large variety of different THz waveforms. If superconducting radiofrequency accelerator technology is used then the THz pulses can be generated with a unique combination of high-THz fields and high repetition-rates. The challenges and scientific opportunities of superradiant THz sources for the coherent THz control of Matter are discussed based on the experiences from two pilot facilities:  TELBE [2], the worldwide first THz user facility based on superradiant THz emission from a compact quasi-cw SRF driven linear accelerator and THz-FLASH [3,4]  the worldwide first facility that operates as a afterburner of the SRF accelerator-driven FLASH XUV SASE FEL. Based on example benchmark experiments the meanwhile achievable time resolution and dynamic range of multicolor ultra-fast experiments is presented. As will be shown novel pulse-resolved detection schemes opera-ting at high repetition rates in the few 100 kHz regime allow to achieve time-resolution of better than 30 fs and a dynamic range of better than 106 [5]. Limits in pulse energy and frequency range inflicted by the specific accelerator designs are discussed.

[1] M. Gensch, SUPER-RADIANT LINAC-BASED THz SOURCES IN 2013, Proceedings of FEL13, New York, (2013), WEIBNO01.

[2] B. Green et al, High-field High-repetition-rate Sources for the coherent THz control of Matter, Sci. Rep. 6 (2016), 22256.

[3] M. Gensch et al, New infrared undulator beamline at FLASH, Infrared Phys. Technol.51 (2008) ,428.

[4] F. Tavella, N. Stojanovic, G. Geloni, M. Gensch, Few femtosecond timing at 4th Generation X-ray Lightsources, Nat. Photon.5 (2011), 162.

[5] S. Kovalev et al, Probing ultrafast dynamics an 4th generation lightsources with high dynamic range, Struct. Dyn. 4 (2017), 10159.



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