Development of high-voltage negative ion based neutral beam injector for fusion devices

Sotnikov, O.; Ivanov, A. A.; Belchenko, Yu. I.; Gorbovsky, A. I.; Deichuli, P. P.; Dranichnikov, A.; Emelev, I. S.; Kolmogorov, V. V.; Kondakov, A. A.; Sanin, A.; Shikhovtsev, I. V.

doi:10.1088/1741-4326/ac175a

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…These losses agreed well with the calculations (Sotnikov et al. 2021) using the ion optical code IBSimu (Kalvas et al. 2010).…”

Section: High Energy Negative Ion-based Injectorsupporting

confidence: 88%

“…Red lines show the calculated trajectories for the beam with an initial energy of 85 keV and divergence at the source of 30 mrad (Sotnikov et al. 2021). …”

Section: High Energy Negative Ion-based Injectormentioning

confidence: 99%

“…At present a prototype of a powerful high-energy neutral beam injector is under development at the BINP (Sotnikov et al. 2021). An RF surface-plasma source produces a negative ion beam by conversion of the hydrogen plasma atoms on a caesium-coated plasma grid.…”

Section: Introductionmentioning

confidence: 99%

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Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Shikhovtsev,

Ivanov,

Davydenko

et al. 2024

J. Plasma Phys.

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An overview of the neutral beam injectors developed at the Budker Institute of Nuclear Physics in Novosibirsk during the last 10 years is presented. These neutral injectors are used for plasma diagnostics, heating and current drive in modern fusion devices with magnetic confinement. An arc or a radio-frequency (RF) discharge generates a plasma in the ion sources of the injectors, and a positive hydrogen or deuterium ion beam is extracted and accelerated by a multiaperture ion-optical system (IOS). The accelerated ion beam is converted into a neutral one in a gas target. The precision multiaperture IOS with spherically concave electrodes provides ballistic focusing of the neutral beam. The high-energy, high-power beam injector based on negative ions, which is currently under development, is described as well. It comprises a RF negative ion source and a wide-aperture electrostatic accelerator separated from the source by a low-energy beam transport line, thereby improving the injector reliability.

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“…These losses agreed well with the calculations (Sotnikov et al. 2021) using the ion optical code IBSimu (Kalvas et al. 2010).…”

Section: High Energy Negative Ion-based Injectorsupporting

confidence: 88%

“…Red lines show the calculated trajectories for the beam with an initial energy of 85 keV and divergence at the source of 30 mrad (Sotnikov et al. 2021). …”

Section: High Energy Negative Ion-based Injectormentioning

confidence: 99%

See 1 more Smart Citation

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Shikhovtsev,

Ivanov,

Davydenko

et al. 2024

J. Plasma Phys.

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“…The negative-ion-based neutral beam injector (N-NBI) is one of the necessary auxiliary heating methods for future fusion reactors [1]. In the N-NBI system, the acceleration grid power supply (AGPS) is the main energy source for the heating process.…”

Section: Introductionmentioning

confidence: 99%

DC active power filter based on model predictive control for DC bus overvoltage suppression of accelerator grid power supply

Zhang

Zhu²,

et al. 2023

Plasma Sci. Technol.

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China Fusion Engineering Test Reactor (CFETR) plans to build a 200kV/25A accelerator grid power supply (AGPS) for the negative-ion-based neutral beam injector (N-NBI) prototype system. The AGPS uses a rectifier-inverter-isolated step-up structure. There is a DC bus between the rectifier and the inverter. In order to limit DC bus voltage ripple and transient fluctuations, a large number of capacitors are used, which degrades the reliability of the power supply and occupies a large amount of space. This paper finds that due to the difference in the turn-off time of the rectifier and the inverter, the capacitance mainly depends on the rectifier current when the inverter is turned off. On this basis, a power active filter (APF) scheme is proposed to absorb the current. To enhance the dynamic response ability of APF, model predictive control is adopted. In this paper, the circuit structure of APF is introduced, the prediction model is deduced, the corresponding control strategy and signal detection method are proposed, and the simulation and experimental results show that APF can track the transient current of DC bus and reduce the voltage fluctuation obviously.

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“…Целью представленной работы было исследование мощного индукционного ВЧ генератора плазмы с многосекундным режимом работы, разработанного для инжектора на основе отрицательных ионов водорода [5]. Исследовались режимы работы генератора при входной мощности до 55 кВт и продолжительности рабочего импульса до 20 секунд.…”

Section: Introductionunclassified

Investigation of a Radiofrequency Plasma Generator for Multi-Second Pulse Operation

Vointsev

Gavrisenko

Kondakov

et al. 2022

jour

Self Cite

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This paper presents the test results of a radiofrequency (RF) plasma generator, developed for neutral beam injectors. A water cooled faraday screen is installed into the generator for multi-second pulse operation. Consistent operation achieved for 20-second long pulses with input power of 38 kW is described. The density of the ion current was measured. The experiments were conducted to measure the density of the ion current at the driver’s output and to evaluate the heating of the driver’s elements. Main factors affecting the power losses were determined. The power loss caused by the eddy currents in the driver’s clamping flanges were reduced.

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Development of high-voltage negative ion based neutral beam injector for fusion devices

Cited by 13 publications

References 10 publications

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

DC active power filter based on model predictive control for DC bus overvoltage suppression of accelerator grid power supply

Investigation of a Radiofrequency Plasma Generator for Multi-Second Pulse Operation

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