title: Preliminary experimental investigation of an X-band Cerenkov-type high power microwave oscillator without guiding magnetic field.
abstract: Among high power microwave (HPM) generators without guiding magnetic field, Cerenkov-type oscillator is expected to achieve a relatively high efficiency, which has already been realized in X-band in our previous simulation work. This paper presents the preliminary experimental investigations into an X-band Cerenkov-type HPM oscillator without guiding magnetic field. Based on the previous simulation structure, some modifications regarding diode structure were made. Different cathode structures and materials were tested in the experiments. By using a ring-shaped graphite cathode, microwave of about one hundred megawatt level was generated with a pure center frequency of 9.14 GHz, and an efficiency of about 1.3%. As analyzed in the paper, some practical issues reduce the efficiency in experiments, such as real features of the electron beam, probable breakdown regions on the cathode surface which can damage the diode, and so forth.
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.
authors.forename: Liming
authors.identifier: 0000000292686913
authors.initials: L
authors.lastname: Guo
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.
authors.forename: Ting
authors.initials: T
authors.lastname: Shu
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Li
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.
authors.forename: Jinchuan
authors.initials: J
authors.lastname: Ju
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China.
authors.forename: Xiaoting
authors.initials: X
authors.lastname: Fang