Development of new experimental setup focusing on long-pulse magnetic reconnection by using rotating magnetic field technique

Yanai, Ryoma; Takahata, Y.; Inomoto, Michiaki

doi:10.1063/1.5025714

Cited by 4 publications

(5 citation statements)

References 16 publications

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“…A new experiment was recently developed at the University of Tokyo to investigate reconnection in a plasma with an ionization fraction of less than 1% [73,219]. Instead of using inductive torus breakdown, they use a rotating magnetic field (RMF) technique to create the plasma configuration.…”

Section: Experiments On Magnetic Reconnection In Partially Ionized Plasmasmentioning

confidence: 99%

“…A new experiment was recently developed at the University of Tokyo to investigate reconnection in a plasma with an ionization fraction of less than 1% [73,219]. Instead of using The systematic uncertainty is of the order of approximately 10 km s −1 and would lead to an overall shift in the vertical scale.…”

Section: Experiments On Magnetic Reconnection In Partially Ionized Pl...mentioning

confidence: 99%

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Magnetic reconnection in partially ionized plasmas

Murphy

et al. 2020

Proc. R. Soc. A.

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Magnetic reconnection has been intensively studied in fully ionized plasmas. However, plasmas are often partially ionized in astrophysical environments. The interactions between the neutral particles and ionized plasmas might strongly affect the reconnection mechanisms. We review magnetic reconnection in partially ionized plasmas in different environments from theoretical, numerical, observational and experimental points of view. We focus on mechanisms which make magnetic reconnection fast enough to compare with observations, especially on the reconnection events in the low solar atmosphere. The heating mechanisms and the related observational evidence of the reconnection process in the partially ionized low solar atmosphere are also discussed. We describe magnetic reconnection in weakly ionized astrophysical environments, including the interstellar medium and protostellar discs. We present recent achievements about fast reconnection in laboratory experiments for partially ionized plasmas.

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Section: Experiments On Magnetic Reconnection In Partially Ionized Plasmasmentioning

confidence: 99%

“…A new experiment was recently developed at the University of Tokyo to investigate reconnection in a plasma with an ionization fraction of less than 1% [73,219]. Instead of using The systematic uncertainty is of the order of approximately 10 km s −1 and would lead to an overall shift in the vertical scale.…”

Section: Experiments On Magnetic Reconnection In Partially Ionized Pl...mentioning

confidence: 99%

Magnetic reconnection in partially ionized plasmas

Murphy

et al. 2020

Proc. R. Soc. A.

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“…2008; Shi et al . 2018; Yanai, Takahata & Inomoto 2018). To secure several coils in place, a structure made out of Teflon material nests all the coils.…”

Section: Features Of the Frc Devicementioning

confidence: 99%

“…To produce current-drive, RF antennas are positioned inside the vacuum chamber. There have been other FRC devices that demonstrate the use of internal RMF antennas (Yambe et al 2008;Shi et al 2018;Yanai, Takahata & Inomoto 2018). To secure several coils in place, a structure made out of Teflon material nests all the coils.…”

Section: Features Of the Frc Devicementioning

confidence: 99%

Development of a field-reversed configuration device using radio frequency antennas to produce E × B for current-drive

Lee,

Jang,

Yoo

et al. 2024

J. Plasma Phys.

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A unique field-reversed configuration (FRC) experiment is presently being assembled at the Plasma Technology Research Institute, KFE. It is a compact small-scale FRC device, which uses a set of radio frequency (RF) antennas to produce an internal E × B that drives the electrons for current-drive, in which E is the electric field and B is the magnetic field. This is very similar to the rotating magnetic field (RMF) current-drive, where the horizontal and vertical antennas are driven 90° out of phase. For this device, the RF antennas are arranged differently than the RMF. The RF antennas, being two separate sets, are positioned inside the vacuum chamber. Each set consists of 8 coils, for a total of 16 coils, where 80~100 kHz sine and cosine waveform currents are applied. One set of coils generates a radial B-field, while the other set provides an E-field in the z-direction. As the phase changes, the E and B fields are switched by these two sets. Nevertheless, E × B propagates in the same θ-direction so that this allows the electrons to rotate around the circumference of the device. The FRC device will test wave heating by launching 2.45 GHz microwaves. Also, passive stabilizers are positioned at each end to provide extra stability while preventing tilt instability. The experiment is expected to produce its first plasma in 2025.

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“…Thus, another experimental approach including the quasisteady state is required to testify the effect of neutral particles in magnetic reconnection. We have successfully developed a new experimental scheme to achieve long-pulse magnetic reconnection by using the rotating magnetic field (RMF) technique [7]. In this paper, we report experimental results of long pulsed magnetic reconnection with sufficient plasma parameters to investigate the effect of neutral particles on magnetic reconnection.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Magnetic Reconnection in Partially Ionized Plasmas Using Rotating Magnetic Field

Takahata

Yanai

Inomoto

2019

Plasma and Fusion Research

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Experimental setup to achieve long-pulse magnetic reconnection in partially ionized plasmas was developed using the rotating magnetic field technique. Two field-reversed configuration plasmas were formed and sustained along the axial direction in the experimental vessel, and the quasi-steady magnetic reconnection condition with the ionization degree of the order of 1 % was maintained for more than 20 ms between the plasmas. Time duration of magnetic reconnection longer than the ion-neutral collision time and plasma parameters where the neutral particles possibly affect the reconnection process, were achieved. Reconnection events observed under the present experimental conditions were classified into three cases according to the ionization degree, and a new experimental regime for magnetic reconnection in partially ionized plasmas was successfully demonstrated.

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Development of new experimental setup focusing on long-pulse magnetic reconnection by using rotating magnetic field technique

Cited by 4 publications

References 16 publications

Magnetic reconnection in partially ionized plasmas

Magnetic reconnection in partially ionized plasmas

Development of a field-reversed configuration device using radio frequency antennas to produce E × B for current-drive

Experimental Study of Magnetic Reconnection in Partially Ionized Plasmas Using Rotating Magnetic Field

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