A large-area planar helicon plasma source with a multi-ring antenna on Linear Experimental Advanced Device (LEAD)

Liu, Hang; Shinohara, Shunjiro; Yu, Yijun; Xu, M.; Zheng, Pengfei; Wang, Z.H.; Gong, Shuwen; Wang, H.J.; Zhu, Yongxiang; Nie, Lin; Ke, Rui; Chen, Y.H.; Duan, Xuru; Ye, M.Y.

doi:10.1088/1748-0221/15/11/p11002

Cited by 7 publications

(9 citation statements)

References 26 publications

(19 reference statements)

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“…Deuterium will be chosen in future PMI research. It has been previously shown that the threshold RF power for the mode transition from inductive mode to helicon mode was 180 W [10]. The helicon plasma emits bright blue light, characterized by argon II emissions [16].…”

Section: Experiments Resultsmentioning

confidence: 99%

“…Thus, helicon plasma sources are preferred by experimentalists who study fundamental turbulence in 2024 JINST 19 P02020 laboratory plasmas. In this article, the first plasma in the LEAD machine is generated by a large-area four-ring-antenna helicon plasma source [10][11][12][13]. Plasma parameters under different input powers, magnetic field strengths, and neutral pressures are described, together with a physical understanding of plasma profiles.…”

Section: Introductionmentioning

confidence: 99%

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The first plasma in a newly constructed linear device for plasma turbulence research

Yu,

Xiao,

Liu

et al. 2024

J. Inst.

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Parameters of the first plasma in a newly built middle-size multi-functional linear plasma device named LEAD (Linear Experimental Advanced Device) were presented. The LEAD device is built to serve as a multi-purpose laboratory plasma experiment platform for various topics, including plasma turbulence, plasma-material interaction, and other fundamental plasma physics. This device is also useful for testing new diagnostic systems. It will be complementary to the HL-2A/HL-3 tokamaks in Southwestern Institute of Physics. The plasma was generated by a large-area helicon plasma source with a multi-ring antenna driven by a 13.56 MHz, 5 kW radio frequency (RF) power source. Argon plasma parameters were measured by a Langmuir probe in different external parameters including RF power, axial magnetic field, and neutral pressure. The threshold power for helicon mode transition is empirically confirmed to be 180 W. Steady-state argon plasma with a density of higher than 1019 m-3 was generated when RF power reached 3 kW. Plasma parameters are crucially influenced by the axial magnetic field. With a weak magnetic field, the radial density profile is Gaussian-like. However, with a stronger magnetic field, shear and reversion of azimuthal rotation velocity reversion appear, resulting in a hollow-shaped density profile. When further increasing the magnetic field, plasma density decreases. Steady-state plasma discharges were achieved under a wide range of argon neutral pressure from 0.1 Pa to over 10 Pa. With increasing neutral pressure, plasma density increases to its maximum at 2.5 Pa and then drops, while electron temperature drops monotonically.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The first plasma in a newly constructed linear device for plasma turbulence research

Yu,

Xiao,

Liu

et al. 2024

J. Inst.

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“…As one of the main objectives of MPS-LD, the experimental simulation of the PMIs is required to achieve divertor plasma conditions, i.e., the typical plasma density of 10 18 -10 20 m −3 and plasma temperature of 1-30 eV [4][5][6]. The helicon plasma source has been widely applied to various LPDs to provide the plasma [7][8][9][10]. However, the temperature of the plasma produced by the helicon source is only several electronvolts (eVs), which is much lower than the requirement.…”

Section: Introductionmentioning

confidence: 99%

Simulation of ion cyclotron resonance heating by using particle-in-cell method in MPS-LD linear plasma device

Sun¹,

Sang²,

Wang³

et al. 2023

Plasma Phys. Control. Fusion

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The auxiliary heating of electrons and ions in linear plasma devices is necessary to achieve the boundary plasma relevant environment of tokamak, so that to investigate the boundary physics and plasma-material interactions. In this work, the simulation of ion cyclotron resonance heating (ICRH) in the linear plasma device MPS-LD is carried out by using a 3D particle-in-cell method, and the wave-ion interaction mechanism based on “beach-heating” technique in the ion heating region is investigated. A left-handed, circularly polarized wave along the magnetic field lines is used to represent the electromagnetic wave in the model, after the analysis of the cold plasma dispersion relation. The mechanism of ion heating by collisionless damping absorption is demonstrated and explained by using plasma current as the plasma response. The dependencies of the heating efficiency on the plasma density, magnetic field strength and magnetic field configuration are studied. The correlation between plasma density and magnetic field strength, which satisfies the heating efficiency, is found and it is in perfect agreement with the theoretical derivation. Finally, by using the designed parameters of MPS-LD provided by SOLPS-ITER, the prediction of ICRH is performed. The simulation result shows the ion temperature can be heated higher than 40 eV and it satisfies the requirement for SOL/divertor simulation experimentally in MPS-LD.

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“…Hao Liu described a planar helicon plasma source with fourring antenna for the linear experimental advanced device (LEAD) (Figure 7) [42,43]. The diameter of the largest ring is 0.32 m. A special feature of the source lies in that the antenna is placed over the cross-section at one end of the vacuum chamber.…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE 7 | LEAD (linear experimental advanced device). Reproduced from[43], with the permission of IOP Publishing.…”

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confidence: 99%

First Helicon Plasma Physics and Applications Workshop

2022

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The First Helicon Plasma Physics and Applications Workshop was held on September 23−24, 2021, through Zoom Cloud Meeting, instead of in an on-site gathering, due to the COVID-19 pandemic. It was convened by Rod Boswell (IOC) and Guangnan Luo (LOC), and organised by Lei Chang’s group. The workshop attracted 110 registrations and ∼100 online audiences from ∼30 affiliations. There were 33 presentations covering the various fundamental physics of helicon plasma and its applications to space electric propulsion, material processing, and magnetic confinement fusion. This paper highlights the presentations, discussions, and perspectives given in the workshop, serving as reference for the helicon community.

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A large-area planar helicon plasma source with a multi-ring antenna on Linear Experimental Advanced Device (LEAD)

Cited by 7 publications

References 26 publications

The first plasma in a newly constructed linear device for plasma turbulence research

The first plasma in a newly constructed linear device for plasma turbulence research

Simulation of ion cyclotron resonance heating by using particle-in-cell method in MPS-LD linear plasma device

First Helicon Plasma Physics and Applications Workshop

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