Experimental Study on 100MW X-band Relativistic Backward Wave Oscillator

Author

Jung, H.C. ; Kim, D.H. ; Min, S.H. ; Yang, Z.Q. ; Wang, M.C. ; Rhee, M.J. ; Park, G.S. ; Kim, H. ; Park, S.Y.

Author_Institution

Sch. of Phys., Seoul Nat. Univ.

fYear

0

fDate

0-0 0

Firstpage

547

Lastpage

548

Abstract

An rippled-wall RBWO is operated at the beam voltage of 250~400kV and current of 2.1~3.4 kA using the 130nsec, single shot using Seoul National University´s electron beam accelerator (SEBA). SEBA produces a hollow beam of 19.2mm-outer radius, 0.7-thickness guided by an axial magnetic field of 1.7-3.4 Tesla. The uniform ripple has a period of 11mm, mean radius of 14mm and ripple amplitude of 2mm. A single cavity-type reflector which excites a TM₀₂ mode and cutoff a TM₀₁ mode at the operating frequency is chosen. Microwave generated by the RB WO is radiated through an 11 cm-diameter horn antenna. The radiation pattern of TM₀₁ mode is measured by fluorescent lamps. The measured and simulated angle of radiation is about 14.9 degree and 13.1 degree, respectively. 110MW microwave was measured at the operating diode voltage of 330kV, the beam current of 2.8kA with the guiding magnetic field of 3.0 T. Efficiency of 12% is obtained by both numerically and experimentally. A typical 20 nsec microwave pulse is measured in the preliminary experiment. The frequency of 11.8GHz is measured by a heterodyne method

Keywords

antenna radiation patterns; backward wave oscillators; heterodyne detection; microwave oscillators; particle accelerators; 100 MW; 11.8 GHz; 130 ns; 2.1 to 3.4 kA; 250 to 400 kV; HPM; X-band oscillator; antenna radiation pattern; cavity-type reflector; electron beam accelerator; fluorescent lamps; heterodyne method; high power microwave; hollow beam; microwave oscillator; microwave pulse; relativistic backward wave oscillator; rippled-wall RBWO; Antenna measurements; Current measurement; Electron accelerators; Electron beams; Magnetic field measurement; Microwave measurements; Oscillators; Particle beams; Pulse measurements; Voltage; high power microwave (HPM); relativistic backward wave oscillator (RBWO);

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2006 held Jointly with 2006 IEEE International Vacuum Electron Sources., IEEE International

Conference_Location

Monterey, CA

Print_ISBN

1-4244-0108-9

Type

conf

DOI

10.1109/IVELEC.2006.1666425

Filename

1666425