This article describes the principles of operation and the
parameters of the SINUS setups designed at the Institute of
High-Current Electronics, Siberian Division, Russian Academy
of Science, over the period from 1990 to 2002. A characteristic
feature of accelerators of the SINUS type is the use of coaxial
forming lines (in particular, with a spiral central conductor)
which are charged by a built-in Tesla transformer to produce
the accelerating high-voltage pulses. This ensures a reasonable
compactness and long lifetime of the setups.
We demonstrate a high power repetitive rf source using gyromagnetic nonlinear transmission line to produce rf oscillations. Saturated NiZn ferrites act as active nonlinear medium first sharpening the pumping high voltage nanosecond pulse and then radiating at central frequency of about 1 GHz: shock rise time excites gyromagnetic precession in ferrites forming damping rf oscillations. The optimal length of nonlinear transmission line was found to be of about 1 m. SINUS-200 high voltage driver with Tesla transformer incorporated into pulse forming line has been designed and fabricated to produce bursts of 1000 pulses with 200 Hz repetition rate. A band-pass filter and mode-converter have been designed to extract rf pulse from low-frequency component and to form TE(11) mode of circular waveguide with linear polarization. A wide-band horn antenna has been fabricated to form Gaussian distribution of radiation pattern. The peak value of electric field strength of a radiated pulse at the distance of 3.5 m away from antenna is measured to be 160 kV/m. The corresponding rf peak power of 260 MW was achieved.
The article presents a source producing high-power ultrawideband
electromagnetic pulses. The source includes a generator of
monopolar pulses, a bipolar pulse former, and a combined
ultrawideband transmitting antenna. Monopolar 150-kV, 4.5-ns
pulses are transformed into bipolar 120-kV, 1-ns pulses, which
are emitted by the antenna. The pulse repetition rate of the
setup is up to 100 Hz. The peak power of the source is 170 MW
as measured with a TEM-type receiving antenna having 0.2–2
GHz passband. The pattern width of the transmitting antenna
at a half-level of peak power is 90° and 105° for the
H- and E-planes, respectively. The electric field strength measured
4 m from the transmitting antenna in the direction of the main
radiation maximum is 34 kV/m.
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