Abstract-Cherenkov terahertz generation by electron bunches in a dielectric lined resonato

This paper appears in:
Quantum Electronics, IEEE Journal of
Author(s): Kumar, M. 
M. Kumar is with the Department of Physics, IIT Delhi, New Delhi- 110016, India. (email:manojailum@gmail.com)
Tripathi, V. 
Volume: PP  , Issue: 99 
Page(s): 1 
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6428588&contentType=Early+Access+Articles&sortType%3Dasc_p_Sequence%26filter%3DAND(p_IS_Number%3A4484580)

The Cherenkov excitation of THz radiation by periodic succession of electron bunches in a dielectric lined resonator is investigated. A TM mode of the resonator, that comprises forward and backward moving slow waves, is resonantly excited by the electron bunches when the bunches are in near phase synchronism with the forward wave. The terahertz wave amplitude rises with successive bunches. Each drive bunch loses a significant amount of energy per unit length about 20%. For suitable parameters, the energy conversion efficiency to terahertz can exceed 10 %.