RF-Driven Ion Sources for Neutral Beam Injectors for Fusion Devices

Fantz, U.

doi:10.1007/978-3-031-21476-9_16

Cited by 4 publications

(1 citation statement)

References 87 publications

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“…Although only one-aperture extraction experiments were conducted in this campaign, the plasma asymmetry in the extraction region was also investigated by two Langmuir probes placed symmetrically with a 26 cm vertical distance and both a 4.2 cm axial distance from the PG. The asymmetry is mainly caused by the ⃗ E × ⃗ B drift [32]: the potential difference is due to the difference in the electron temperatures of the plasmas in the regions in front f the PG and the region downstream of the driver and the interaction between those plasmas and the expansion chamber walls. Figure 9 shows the variation of the plasma parameters (n e , n i , T e , and V p ) obtained by two probes as a function of the PG current for different RF powers.…”

Section: Plasma Asymmetrymentioning

confidence: 99%

Beam extraction under Cs-free conditions in HUST negative ion source

Zuo

Yang

et al. 2023

Plasma Phys. Control. Fusion

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A radio-frequency driven negative hydrogen ion source is under development at Huazhong University of Science and Technology, which aims to investigate the physics of production and extraction of the negative ions. The source operational parameters are investigated to research the source plasma characteristics and optimize the extraction properties before cesium injection, which means negative ions were mostly produced by reactions in the plasma volume in this study. The magnetic filter field generated by a PG (plasma grid) current flowing through the plasma grid can cool down the electron temperature below 1 eV, but simultaneously increased the plasma density in the extraction region. This plasma asymmetry in the direction perpendicular to the PG filter field, is discussed and compared with that in other ion sources. As the PG current increased, the asymmetry factors tended to increase first and then decrease. Biasing the plasma grid positively with respect to the source body can reduce the co-extracted electrons effectively, resulting in reducing the electron to H− ion current ratio. An extracted negative beam with a current density of about 19 A/m2 and an energy of 12 keV was achieved under 20 kW RF power and 0.3 Pa filling pressure, with a ratio of electron current to ion current of about 54.

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Section: Plasma Asymmetrymentioning

confidence: 99%

Beam extraction under Cs-free conditions in HUST negative ion source

Zuo

Yang

et al. 2023

Plasma Phys. Control. Fusion

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Development and characterization of radio frequency ion source

Lawitlang,

Thanga,

Lalthanthuama

et al. 2024

Indian J Phys

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EUROfusion contributions to ITER nuclear operation

Litaudon,

Fantz,

Villari

et al. 2024

Nucl. Fusion

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ITER is of key importance in the European fusion roadmap as it aims to prove the scientific and technological feasibility of fusion as a future energy source. The EUROfusion consortium of labs is contributing to the preparation of ITER scientific exploitation and operation and aspires to exploit ITER outcomes in view of DEMO. The paper provides an overview of the major progress obtained recently, carried out in the frame of the new (initiated in 2021) EUROfusion Work-Package called “Preparation to ITER Operation” (PrIO). The overview paper is directly supported by the eleven EUROfusion PrIO contributions given at the 29th Fusion Energy Conference (16-21 October 2023) London, UK [https://www.iaea.org/events/fec2023]. The paper covers the following topics: (i) development and validation of tools in support to ITER operation (plasma breakdown/burn-through with evolving plasma volume, new infra-red synthetic diagnostic for off-line analysis and wall monitoring using Artificial Intelligence techniques, synthetic diagnostics development, development and exploitation of multi-machine databases); (ii) R&D for the Radio-Frequency ITER Neutral Beam sources leading to 1 h negative deuterium ions current extraction at ELISE and participation in the Neutral Beam Test Facility with progress on the ITER source SPIDER, and, the commissioning of the 1 MV high voltage accelerator (MITICA) with lessons learned for ITER; (iii) validation of neutronic tools for ITER nuclear operation following the second JET deuterium-tritium experimental campaigns (DTE2) carried out in 2021 (neutron streaming and shutdown dose rate calculation, water activation and activated corrosion products with advanced fluid dynamic simulation; irradiation of several materials under 14.1 MeV neutron flux etc).

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RF-Driven Ion Sources for Neutral Beam Injectors for Fusion Devices

Cited by 4 publications

References 87 publications

Beam extraction under Cs-free conditions in HUST negative ion source

Beam extraction under Cs-free conditions in HUST negative ion source

Development and characterization of radio frequency ion source

EUROfusion contributions to ITER nuclear operation

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