Improvements in a Tracer-Encapsulated Solid Pellet and Its Injector for More Advanced Plasma Diagnostics

Tamura, N.; Sudo, S.; Suzuki, C.; Funaba, H.; Takagi, Masaru; Satoh, N.; Hayashi, Hiromi; Maeno, H.; Yokota, Mitsuhiro; Ogawa, Hideki

doi:10.1088/1742-6596/823/1/012003

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…To study impurity transport, a small amount of tracer particles is injected as an impurity, and their behavior is tracked using optical measurements. Gas puffing [1], laser blow-off [2], and pellet injection [3] have been used to inject tracer particles so far. As a new tracer injection method, we have proposed a tracer-containing compact toroid (TCCT) injection [4] to expand the experimental range of impurity transport studies.…”

Section: Introductionmentioning

confidence: 99%

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Seki

Kobayashi

Sasaki

et al. 2020

Plasma and Fusion Research

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Studying impurity behavior in a magnetically confined plasma is essential for fusion reactor developments. A tracer-containing compact toroid (TCCT) injection have been developed as a new tracer injection technique for studying impurity accumulation and behavior in magnetically confined fusion plasmas. We generated and ejected the TCCT using a compact toroid (CT) injector that had successfully demonstrated CT injection fueling into a large field-reversed configuration (FRC). Tracer ions, e.g., tungsten, copper, and aluminum, are supplied by an independently controlled tracer source attached to the CT injector. The plasma containing tracer ions is accelerated and ejected by Lorentz self-force as the TCCT. To investigate whether tracer ions can be injected into the plasma without separation from the TCCT, we experiment by injecting the TCCT injection into a transverse magnetic field, emulating a confinement magnetic field of the FRC plasma.

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Section: Introductionmentioning

confidence: 99%

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Seki

Kobayashi

Sasaki

et al. 2020

Plasma and Fusion Research

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Active Lithium Injection for a Real Time Control of the Divertor Heat Flux for Fusion Devices

Ono,

Raman

2023

J Fusion Energ

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Development of a tracer-containing compact-toroid injection system

Kobayashi

Asai

Yamada

et al. 2018

Review of Scientific Instruments

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The accumulation and behavior of impurities is one of the most important subjects in the development of magnetically confined fusion reactors because impurities can potentially cause cooling and worsen the confinement of the hot core plasma. Tracer-encapsulated solid pellets (TESPELs) have demonstrated some results for impurity injection for fusion-reactor plasma studies [N. Tamura et al., J. Phys. Conf. Ser. 823, 012003 (2017)]. However, the TESPEL technique has several shortcomings, for example, the penetration depth and the amounts of tracer impurities. In the present study, we have developed a tracer-containing, compact-toroid (TCCT) injection system that utilizes a magnetized coaxial plasma gun (MCPG). The discharge current through the MCPG sputters and ionizes the electrode material, and the Lorenz self-force accelerates it as a plasmoid. The MCPG easily accelerates a magnetized plasmoid to speeds greater than the ion thermal velocity of several tens of kilometers per second. The accelerated and ejected plasmoid that contains the tracer ions is itself a warm, ionized plasma. Therefore, a TCCT can potentially be injected into the core region of a target plasma with less adverse effect.

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Improvements in a Tracer-Encapsulated Solid Pellet and Its Injector for More Advanced Plasma Diagnostics

Cited by 4 publications

References 14 publications

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Active Lithium Injection for a Real Time Control of the Divertor Heat Flux for Fusion Devices

Development of a tracer-containing compact-toroid injection system

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