DCMPMS Seminars

High-Power and portable “plasma assisted sub-THz source”

by Dr. Niraj Kumar (CSIR- Pilani, Rajasthan)

Thursday, May 26, 2022 from to (Asia/Kolkata)
at D406 Zoomlink: https://zoom.us/j/95793026694 Meeting ID: 957 9302 6694 Passcode: 936314
Description
According to the new market research report "Terahertz Technology Market by Type (Terahertz Imaging, Terahertz Spectroscopy, and Terahertz Communication Systems), Technology (Terahertz Source and Terahertz Detector), Application & Region - Analysis & Forecast to 2022", the global terahertz technology market is expected to reach USD489.8 Million by 2026, growing at a Compound Annual Growth Rate (CAGR) of 31.83%. In the sub-THz band, a backward wave oscillator (BWO) is a promising source to produce coherent radiation at higher power and has attracted a lot of interest for its strategic and industrial applications like imaging, diagnostics, non-destructive testing, etc. The BWO can realize broad tunable bandwidth by adjusting its operating voltage and can generate high power output without the need of a driving signal. Nevertheless, as the frequency increases it becomes increasingly difficult using conventional hot cathodes to focus and form high current density, and high-quality electron beams through the small size interaction region of the THz BWO. This issue can be mitigated by the presence of plasma in the interaction region. As frequency increases, the size of the interaction region needs to be reduced which limits the power handling capability of such high frequency THz sources. The fabrication of planar interaction region is less complex than cylindrical counterpart. Also, the sheet-electron-beam has advantages in terms of reduced space charge field over cylindrical electron beam and can lead to effective conversion of its energy to radio frequency (RF) wave inside the planar interaction structure.  CSIR-CEERI has developed relevant technological base in the domain of plasma assisted sub-THz source. Therefore, CSIR-CEERI is working on development of high power (> 1W peak) and portable plasma assisted sheet beam driven sub-THz source.