PROGRESS IN STABLE OPERATION OF HIGH POWER GYROTRONS

The experimental results on high-power ion beams (HPIB) generation in a plasma-filled, spherical-focusing diode with self-magnetic insulation that was placed for a load at nanosecond accelerator PARUS of 0.2-TW power and 60-ns pulse duration (in a matched load case) are given. The regimes of plasma-filled diode operation and generation of the ion beam were investigated. For optimal time delay between the plasma gun's pulse and accelerator firing, the stable operation in the plasma opening switch mode with a power enhancement factor of 2.3 and efficiency of ion beam generation of 20–25% was obtained. The maximal value of the ion current density reached in the focal plane was 15 kA/cm2.

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Stable operation (over 5000 h) of high-power 0.98- mu m InGaAs-GaAs strained quantum well ridge waveguide lasers for pumping Er/sup 3+/-doped fiber amplifiers

IEEE Photonics Technology Letters ◽

10.1109/68.60760 ◽

1990 ◽

Vol 2 (10) ◽

pp. 689-691 ◽

Cited By ~ 39

Author(s):

M. Okayasu ◽

M. Fukuda ◽

T. Takeshita ◽

S. Uehara

Keyword(s):

Quantum Well ◽

High Power ◽

Ridge Waveguide ◽

Fiber Amplifiers ◽

Stable Operation ◽

Waveguide Lasers ◽

Strained Quantum Well ◽

Ridge Waveguide Lasers

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Note: A new regulation method of stable operation of high power cathode ion source

Review of Scientific Instruments ◽

10.1063/1.4921705 ◽

2015 ◽

Vol 86 (5) ◽

pp. 056110 ◽

Cited By ~ 2

Author(s):

C. C. Jiang ◽

Y. H. Xie ◽

C. D. Hu ◽

Y. L. Xie ◽

S. Liu ◽

...

Keyword(s):

High Power ◽

Ion Source ◽

Stable Operation ◽

Regulation Method

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Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

Nuclear Fusion ◽

10.1088/1741-4326/ac42f4 ◽

2021 ◽

Author(s):

Takayuki Kobayashi ◽

Hibiki Yamazaki ◽

Shinichi Hiranai ◽

Masayuki Sawahata ◽

Masayuki Terakado ◽

...

Keyword(s):

Transmission Line ◽

High Power ◽

Electron Cyclotron ◽

Current Drive ◽

Stable Operation ◽

Electron Cyclotron Heating ◽

Dummy Load ◽

Mode Purity ◽

Long Pulse

Abstract A gyrotron and a matching optics unit (MOU) for the multi-frequency electron cyclotron heating and current drive (ECH/CD) system in JT-60SA have been developed successfully. The gyrotron demonstrated stable operation at high powers of 1.5 MW for 5 s and 1.9 MW for 1 s at 110 GHz. To obtain high HE11 mode purity (> 90%) at the outlet of the waveguide in the ECH/CD launcher, a MOU for operating at three frequencies of 82 GHz, 110 GHz, and 138 GHz that includes three pairs of water-cooled phase correcting mirrors has been developed, which allows the mirrors to be changed without opening the evacuated MOU. The mode purity at the inlet of a dummy load in the transmission line was evaluated at high-power and an HE11 mode purity of > 90% was obtained at three frequencies.

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Highly stable operation of 1.3-μm InGaAsP double-channel planar BH laser diodes at high temperature and high power

10.1364/cleo.1983.wg3 ◽

1983 ◽

Author(s):

Masafumi Seki ◽

Shigeru Murata ◽

Kohroh Kobayashi ◽

Shoji Katayama ◽

Kuniakira Iwamoto ◽

...

Keyword(s):

High Temperature ◽

High Power ◽

Laser Diodes ◽

Stable Operation ◽

Double Channel

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Stable operation of a high-power piezoelectric transformer comprising two identical bolt-clamped Langevin-type transducers and a stepped horn

Japanese Journal of Applied Physics ◽

10.7567/jjap.57.066701 ◽

2018 ◽

Vol 57 (6) ◽

pp. 066701 ◽

Cited By ~ 1

Author(s):

Kazunari Adachi ◽

Kohei Suzuki ◽

Yuki Shibamata

Keyword(s):

High Power ◽

Stable Operation ◽

Piezoelectric Transformer

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Artificial Intelligence-Based Weighting Factor Autotuning for Model Predictive Control of Grid-Tied Packed U-Cell Inverter

Energies ◽

10.3390/en13123107 ◽

2020 ◽

Vol 13 (12) ◽

pp. 3107 ◽

Cited By ~ 1

Author(s):

Mostefa Mohamed-Seghir ◽

Abdelbasset Krama ◽

Shady S. Refaat ◽

Mohamed Trabelsi ◽

Haitham Abu-Rub

Keyword(s):

Artificial Intelligence ◽

Model Predictive Control ◽

Power Quality ◽

Predictive Control ◽

High Power ◽

Weighting Factor ◽

Function Optimization ◽

Stable Operation ◽

Grid Current ◽

Multi Objective

The tuning of weighting factor has been considered as the most challenging task in the implementation of multi-objective model predictive control (MPC) techniques. Thus, this paper proposes an artificial intelligence (AI)-based weighting factor autotuning in the design of a finite control set MPC (FCS-MPC) applied to a grid-tied seven-level packed U-cell (PUC7) multilevel inverter (MLI). The studied topology is capable of producing a seven-level output voltage waveform and inject sinusoidal current to the grid with high power quality while using a reduced number of components. The proposed cost function optimization algorithm ensures auto-adjustment of the weighting factor to guarantee low injected grid current total harmonic distortion (THD) at different power ratings while balancing the capacitor voltage. The optimal weighting factor value is selected at each sampling time to guarantee a stable operation of the PUC inverter with high power quality. The weighting factor selection is performed using an artificial neural network (ANN) based on the measured injected grid current. Simulation and experimental results are presented to show the high performance of the proposed strategy in handling multi-objective control problems.

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Research on Critical SVG Technology for Low Voltage High Power Load

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1049-1050.716 ◽

2014 ◽

Vol 1049-1050 ◽

pp. 716-719

Author(s):

Li Jun Ye ◽

Shu Han Wang ◽

Xiao Chen Yu ◽

Yu Tao Hu ◽

Jian Wang

Keyword(s):

High Power ◽

Reactive Power ◽

Low Voltage ◽

Stable Operation ◽

Arc Furnace ◽

High Current ◽

Harmonic Compensation ◽

Power Load ◽

Submerged Arc Furnace ◽

Submerged Arc

impact loads, such as submerged arc furnace, are often used in the smelting industry, their features include high power, low voltage, high current, rated power is from several MVA to tens of MVA, rated voltage is less than 200V. Reactive and harmonic compensation scheme for such load is generally centralized compensation on high voltage side of the power grid, facts have proved that, the effect of such compensation mode is not satisfactory to customers. Therefore, people have designed a special low voltage high power SVG, which is installed on the low voltage side for compensation, it could perform reactive power compensation, and filter out harmonic, protect against grid voltage fluctuation and flicker caused by submerged arc furnace in different production periods effectively.Compared with common SVG project, how to guarantee safe and stable operation of the equipment under high current conditions is critical technical issue in the design. This paper takes an example of an actual project, designs water-cooled copper pipe bus as connecting bus of low voltage high power SVG. Rationality and feasibility of this design has been proved in actual equipment operation.

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