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The FELBE user facility located at the Helmhotz-Zentrum Dresden-Rossendorf operates two free-electron lasers (FELs). The FELs are based on the superconducting electron linear accelerator ELBE, which provides short (picosecond) electron bunches with energies up to 35 MeV at a 13 MHz repetition rate. Here we discuss the basic parameters of the FELs and the experimental opportunities at the facility.
We show that the spectrally wideband optical tunability of terahertz transmission through silicon can be strongly improved by deposition of graphene. We measured enhanced modulation up to ΔM=24% at a low modulation beam power of 40 mW and a maximal modulation depth of up to M=99%.
We present an analysis on bond-dissociation dynamics of DNA-based molecular machines under terahertz radiation. Our goal is to control micro/nanoworld utilizing artificial molecular machines. In this work we aim to provide fundamental findings to construct platform technologies to control artificial molecular systems using terahertz waves.
During tests of a megawatt-class 140 GHz gyrotron for the fusion experiment Wendelstein 7-X, a window RF arc was documented with a high-resolution spectral measurement system. The arc event coincided with strong perturbations of the nominal cavity mode TE-28,8 and a final mode switch to a neighbor mode. Simulations using a self-consistent interaction code (SELFT) have reproduced the main features...
A method for directly detecting edges in images which are obtained with a passive stand-off terahertz (THz) imaging system is presented. This novel method can improve the signal-to-noise ratio of THz images as well as it may contribute to solving the privacy problem of body scanners. In addition the proposed method when used with a suitable Spatial Light Modulator (SLM) allows imaging in the lock-in...
To study low-energy magnetic dynamics and excitations in condensed matter systems in high magnetic fields, we are developing a unique terahertz time-domain magneto-optical spectroscopy system. The system is based on a compact single-shot terahertz spectroscopy setup using an echelle optic combined with a repetitive mini-coil pulsed magnet.
Recent progress of JAEA high power long pulse gyrotron is reported. Multi-frequency oscillations and their Gaussian beam outputs are demonstrated at 170 GHz, 137 GHz and 104 GHz. For the full power modulation, clear 5kHz modulation was demonstrated using double anode switching. Furthermore, novel anode power supply system was fabricated to simplify the gyrotron power supply system.
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