**5.2 Other applications of gyrotron**

Other important scientific research application of gyrotron is in the area of spectroscopy. This includes, electron spin resonance (ESR) spectroscopy, dynamic nuclear polarization – nuclear magnetic resonance (DNP-NMR) Spectroscopy, X-ray diffraction magnetic resonance (XRDMR) spectroscopy etc. Also, W- band frequency of 95 GHz being an atmospheric window, gyrotrons operating at W-band are having special significance in connection with defense and homeland-security [17, 18]. The active denial systems (ADS) for controlling low-intensity conflicts, uses 95 GHz gyrotron. Also a number of millimeter-wave radar systems, such as space surveillance radar, space derby radar, imaging radar and weather radar uses W-band gyrotron as well as gyro-TWT/ gyro-klystrons.
