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Nizhniy Novgorod, Russia

Zaitsev N.I.,RAS Institute of Applied Physics | Guznov Y.M.,RAS Institute of Applied Physics | Kuzikov S.V.,RAS Institute of Applied Physics | Plotkin M.E.,RAS Institute of Applied Physics | And 2 more authors.
Radiophysics and Quantum Electronics | Year: 2014

We present the results of experimental studies of the gyroklystron with cavities operated with the sequence of TE7.1.1 - TE 7.3.1 volume modes and a radiation frequency of 35.4 GHz. At an accelerating voltage of 320 kV, we obtained an output radiation power of 15 MW for an efficiency over 30%, an amplification coefficient of 30 dB, an amplification band of 50 MHz, and a microwave pulse duration of 0.5 μs. © 2014 Springer Science+Business Media New York. Source


Bogdashov A.A.,Institute of Applied Physics | Belousov V.I.,Institute of Applied Physics | Chirkov A.V.,Institute of Applied Physics | Denisov G.G.,Institute of Applied Physics | And 3 more authors.
Journal of Infrared, Millimeter, and Terahertz Waves | Year: 2011

We describe the design and test results of the transmission line for liquid-state (LS) and solid-state (SS) DNP spectrometers with the second-harmonic 258.6 GHz gyrotron at the Institute of the Biophysical Chemistry Center of Goethe University (Frankfurt). The 13-meter line includes a mode converter, HE11 waveguides, 4 mitre bends, a variable polarizer-attenuator, directional couplers, a water-flow calorimeter and a mechanical switch. A microwave power of about 15 W was obtained in the pure HE11 mode at the spectrometer inputs. © 2011 Springer Science+Business Media, LLC. Source


Litvak A.G.,RAS Institute of Applied Physics | Denisov G.G.,RAS Institute of Applied Physics | Myasnikov V.E.,RAS Institute of Applied Physics | Tai E.M.,GYCOM Ltd. | And 2 more authors.
EPJ Web of Conferences | Year: 2012

Regime with 1000-s pulse duration at 1MW output power and efficiency ~53% has been implemented in the ITER gyrotron prototype. Upgrade of few gyrotron units was undertaken to increase its operation reliability. New gyrotron prototype equipped with modernized units will be manufactured in summer and its test will start in autumn 2012. Interfaces between a gyrotron and an equipment which is to be delivered as its integrated package from one side and ITER systems and services from another side are now main subject of discussion with IO team. Manufacturing and testing of the multi-frequency gyrotron for ASDEX Upgrade with new tunable window is in progress. Short pulse (0.1 sec) tests showed good operation at 4 frequencies. Gaussian mode content in the output wave beam is high. Ceramics window used for the short pulse tests was replaced to the diamond window. In 3 second pulses the gyrotron showed 0.9 MW at 140 GHz and 0.8 MW at 105 GHz. Gyrotron conditioning will be continued in July 2012. © Owned by the authors, published by EDP Sciences, 2012. Source


Glyavin M.Y.,RAS Institute of Applied Physics | Chirkov A.V.,RAS Institute of Applied Physics | Denisov G.G.,RAS Institute of Applied Physics | Fokin A.P.,RAS Institute of Applied Physics | And 13 more authors.
Review of Scientific Instruments | Year: 2015

A 263 GHz continuous-wave (CW) gyrotron was developed at the IAP RAS for future applications as a microwave power source in Dynamic Nuclear Polarization / Nuclear magnetic resonance (DNP/NMR) spectrometers. A new experimental facility with a computerized control was built to test this and subsequent gyrotrons. We obtained the maximum CW power up to 1 kW in the 15 kV/0.4 A operation regime. The power about 10 W, which is sufficient for many spectroscopic applications, was realized in the low current 14 kV/0.02 A regime. The possibility of frequency tuning by variation of the coolant temperature about 4 MHz/1 °C was demonstrated. The spectral width of the gyrotron radiation was about 10-6. © 2015 AIP Publishing LLC. Source


Denisov G.G.,RAS Institute of Applied Physics | Chirkov A.V.,RAS Institute of Applied Physics | Belousov V.I.,RAS Institute of Applied Physics | Bogdashov A.A.,RAS Institute of Applied Physics | And 11 more authors.
Journal of Infrared, Millimeter, and Terahertz Waves | Year: 2011

The present paper reports on the recent development of several oversized millimeter wave transmission line components for different applications. The studies include a circular TE 11-to-Gaussian beam mode converting horn, a TM 01-to-rotating TE 31 mode converter, a TE 11-mode 90° bend, a series of different HE 11-mode transmission line components, a notch filter and a fast laser controlled semiconductor microwave switch. © 2011 Springer Science+Business Media, LLC. Source

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