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2001-12-12 Фундаментальные и прикладные физические исследования. 1986–2001 гг.: Сб. тр. / Редкол.: В. Г. Барышевский, С. Н. Сытова, С. А. Максименко и др.; Под ред. В. Г. Барышевского. – Мн.: БГУ, 2001. C.170-174 First lasing of volume free electron laser (VFEL) is observed. The generating system consists of two metal diffraction grating with different spatial periods. The first grating creates the conditions for Smith Purcell emission mechanism. The second grating provides the distributed feedback for emitted wave. The length of diffraction grating is 10 cm. Voltage impulse with a time duration ~ 10 ms had a sinusoidal form with the amplitude varied from 1 to ~ 10 kV. The measured microwave power reached the value of about 3–4 Wt in wavelength range 4~λ mm. The peak current varied from 100 to 35 mA. The generation stopped at current value < 35 mA. When the current value was near the threshold current the generation was observed in narrow region of voltage V~5 kV that coincided with theoretical prediction. At greater currents the generation took place in continuous range of voltage from 5 to 7.5 kV. Download:
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