Paoloni, Claudio and Gamzina, Diana and Himes, Logan and Popovic, Branko and Barchfeld, Robert and Yue, Lingna and zheng, yuan and Tang, Xiaopin and Tang, Ye and Pan, Pan and Li, Hanyan and Letizia, Rosa and Mineo, Mauro and Feng, Jinjun and Luhmann Jr., Neville C (2016) THz backward-wave oscillators for plasma diagnostic in nuclear fusion. IEEE Transactions on Plasma Science, 44 (4). pp. 369-376. ISSN 0093-3813
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Abstract
Understanding of the anomalous transport attributed to short-scale length microturbulence through collective scattering diagnostics is key to the development of nuclear fusion energy. Signals in the subterahertz (THz) range (0.1–0.8 THz) with adequate power are required to map wider wavenumber regions. The progress of a joint international effort devoted to the design and realization of novel backward-wave oscillators at 0.346 THz and above with output power in the 1 W range is reported herein. The novel sources possess desirable characteristics to replace the bulky, high maintenance, optically pumped far-infrared lasers so far utilized in this plasma collective scattering diagnostic. The formidable fabrication challenges are described. The future availability of the THz source here reported will have a significant impact in the field of THz applications both for scientific and industrial applications, to provide the output power at THz so far not available.