Preliminary experimental results of a repetitive 0.14 THz overmoded relativistic surface waveoscillator (RSWO) are presented in this paper. The repetitive RSWO is developed by using a rectangularly corrugated slow-wave structure with overmoded ratio of 3 and a foilless diode emitting annular electron beam with thickness of 0.5 mm. The high quality electron beams at the repetition rate of 10 are obtained over a wide range of diode voltage (180 kV < U < 240 kV) and current (700 A < I < 1.2 kA). The generation experiments of RSWO are conducted at an axial pulsed magnetic field whose maximum strength and duration can reach about 2.7 T and 1 s, respectively. The experimental results show that the RSWO successfully produces reasonable uniform terahertz pulses at repetition rate of 10, and the pulse duration, frequency, and power of a single pulse are about 1.5 ns, 0.154 THz, and 2.6 MW, respectively, whereas the dominated radiation mode of the RSWO is TM02.
Received 14 February 2013Accepted 21 March 2013Published online 05 April 2013
Article outline: I. INTRODUCTION II. DESIGN OF 0.14 THz OVERMODED RSWO III. GENERATION AND PROPAGATION OF REPETITIVE THIN ANNULAR ELECTRON BEAMS A. Experimental and measurement setup B. Measurement results and analysis IV. TERAHERTZ WAVE GENERATION AND MEASUREMENT EXPERIMENTS A. Experimental and measurement setup B. Repetitive terahertz pulses generation C. Frequency measurement D. Mode analysis E. Measurement of radiated power V. CONCLUSIONS AND DISCUSSIONS
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