Author: Zhong, H.H.
Paper Title Page
MOPC132 Influences of the Inner-conductor on Microwave Characteristics in an L-band Relativistic Backward-wave Oscillator* 388
 
  • X.J. Ge, L. Liu, B.L. Qian, J. Zhang, H.H. Zhong
    National University of Defense Technology, Changsha, Kaifu District, People's Republic of China
 
  Funding: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China. *gexingjun230230@yahoo.com.cn
The in­flu­ences of the in­ner-con­duc­tor on mi­crowave char­ac­ter­is­tics in an L-band rel­a­tivis­tic back­ward-wave os­cil­la­tor (RBWO) are in­ves­ti­gat­ed the­o­ret­i­cal­ly and ex­per­i­men­tal­ly. The nu­mer­i­cal re­sults show that the res­o­nance fre­quen­cy de­creas­es ob­vi­ous­ly with the in­crease in the in­ner-con­duc­tor ra­dius. To ver­i­fy the above con­clu­sions, an L-band coax­i­al RBWO is in­ves­ti­gat­ed in de­tail with par­ti­cle-in-cell (PIC) code. It is shown that the fre­quen­cy is low­ered from 1.63 GHz to 1.51 GHz when the in­ner-con­duc­tor ra­dius in­creas­es from 0.5 cm to 2.5 cm. And the ef­fi­cien­cy varies in the range of 35.4-27.7%. Fur­ther­more, ex­per­i­ments are car­ried out at the Torch-01 ac­cel­er­a­tor. When the diode volt­age is 887.6 kV and the cur­rent is 7.65 kA, the ra­di­at­ed mi­crowave with fre­quen­cy of 1.61 GHz, power of 2.13 GW and ef­fi­cien­cy of 31.3% is gen­er­at­ed. It is found that the fre­quen­cy de­creas­es from 1.64 GHz to 1.58 GHz when the in­ner-con­duc­tor ra­dius in­creas­es from 0.5 cm to 1.5 cm. And the ef­fi­cien­cy varies in the range of 31.3-29.8%.