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The paper discusses several approaches which allow development of microwave components with unique parameters. Results of two recent experiments illustrate practical value of the methods applied.
The CW/263 GHz gyrotron is developed at IAP RAS for future application as microwave power source in DNP/NMR spectrometers. The new experimental facility with computerized control was built to test this and subsequent gyrotrons. The maximum power up to 1 kW in 15 kV/0.4A operation regime has been obtained. The power about 10W, which looks enough for spectroscopy, was realized in low current 14 kV /...
Design development of continuous-wave 240 GHz gyrotron and 300 GHz gyrotrons with output power about 200–1000 kW for fusion research at advanced plasmas with intense magnetic field is presented. Main goal of such gyrotrons is application for EC complexes of IGNITOR and DEMO tokamaks. This paper includes task motivation and existing technical basis, results of calculation, design, technical requirements...
The paper presents development status of a gyrotron setup for ITER. Twenty four such setups are to be used for heating and current drive in ITER plasma. The setup includes a gyrotron in a superconducting magnet and several tens of other components. Recently the main required gyrotron parameters were demonstrated. In the last year tests confirmed 95% reliability of gyrotron operation. Now a prototype...
Results of the continued work on 1.5–1.7 MW CW gyrotron development are presented. Last year 1.5-MW power was attained at 92 kV beam voltage and 52 A beam current. This year the gyrotron with modernized electron-optical system was tested yielding up to 1.5-MW power at 72–77 kV beam voltage and 64–70 A beam current.
The present paper concerns the state of the art of the development and experimental investigations of subterahertz gyrotrons for spectroscopy applications at IAP RAS. The gyrotron with frequency of 258 GHz and power of 100 watts is successfully used for spectroscopy experiments and 80-time rising of sensitivity has been obtained. The fundamental harmonic gyrotron with an internal mode converter is...
During last years several new gyrotrons were developed at IAP/GYCOM. The main ITER requirements to a gyrotron have been demonstrated: 170 GHz frequency, 1MW power, 1000 seconds pulse duration, 53% efficiency. For a multi-frequency gyrotron a novel scheme for a tunable window was developed. Additionally some other new gyrotrons were developed for running plasma installations. New directions in the...
The industrial production prototype of the ITER gyrotron was tested at the new test stand in Kurchatov institute with power 1 MW in 500 second pulses, and 0.9MW in 1000 second pulses. Operation reliability of the gyrotron in long pulses and output power modulation characteristics also were studied. Last year one more gyrotron prototype was fabricated and its testing began. Simultaneously at IAP a...
We report the design and test of the transmission line for DNP spectrometer with 258GHz gyrotron. The 16 meter line includes mode converter, HE11 waveguides, 5 mitre bends, variable attenuator, directional couplers, calorimeter and switch. Transmission is 70 ± 15% with 15Watt in the pure HE11 mode.
The industrial production prototype of the ITER gyrotron was tested at the new test stand in Kurchatov institute with power 1.02 MW in 240 second pulses, and 0.8MW in 800 second pulses. Simultaneously at IAP a short pulse gyrotron with an increased size cavity was tested at power 1.5-2 MW.
The acute problem of in-waveguide transformation of an operating mode of the coaxial cavity gyrotron TE34,19 into paraxial Gaussian beam is solved. A short highly effective launcher which provided such a transformation is synthesized, fabricated and tested. Results of the experiment confirm the approach adequacy. The measured TEM0,0 mode content in the output launcher wavebeam exceeds 95%.
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