Origin and Evolution of Spontaneous Rotation in Plasma Under Different Magnetic Field Geometries in Tokamak QUEST

Mishra, K.; Zushi, H.; Idei, H.; Onchi, Takumi; Hasegawa, Makoto; Hanada, K.; Team, Quest

doi:10.1109/tps.2016.2522765

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…The flow velocities that we obtained are emissivityweighted averages along the viewing chords. The velocities measured with the toroidal setup are close to the local toroidal velocities at y = R because the angle between the viewing chord and the velocity is smallest at this point [7]. For the poloidal setups, the measured flow velocities are projections of the radial and vertical velocities on the viewing chords.…”

Section: Resultsmentioning

confidence: 60%

Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Yoneda

Shikama

Zushi

et al. 2018

Plasma and Fusion Research

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Toroidal electron cyclotron resonance (ECR) plasma is an ECR heated plasma in an open toroidal magnetic field. The plasma contains no toroidal current and is used for the pre-ionization and non-inductive startup of a tokamak plasma. To obtain a deeper understanding of the basic properties of the plasmas produced in the spherical tokamak QUEST (Q-shu University Experiment with steady-state Spherical Tokamak), we have developed an optical emission spectroscopy system with multiple viewing chords and have used it to measure the spatial distributions of the toroidal and poloidal flow velocities of C 2+ ions. We compare the measured velocities with those calculated from the ion drift equations using the plasma parameters reported for a similar spherical tokamak, LATE (the Low Aspect Ratio Torus Experiment).

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Section: Resultsmentioning

confidence: 60%

Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Yoneda

Shikama

Zushi

et al. 2018

Plasma and Fusion Research

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“…Such flows respond to I p oscillation. Recent progress in the research in QUEST [18] has verified that a rigid toroidal rotation is generated spontaneously on the open magnetic fluxes in the start-up phase. The core velocity exceeds 10 km s −1 after the LCFS and separatrix are configured.…”

Section: Plasma Physics and Controlled Fusionmentioning

confidence: 99%

Response of the far scrape-off layer plasma to strong gas puffing in the high poloidal beta configuration of the QUEST spherical tokamak

Onchi

Zushi

Mishra

et al. 2016

Plasma Phys. Control. Fusion

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The response of the far scrape-off layer (far-SOL) to strong gas puffing (SGP), and its role as the boundary condition for core plasma, are investigated using a two-point Langmuir probe measurement in the high poloidal beta configuration in the QUEST spherical tokamak. The temperature and heat flux behave in an opposite way in the far-SOL and end-plate region after SGP, although SGP increases the density globally. The apparent density decay time in the far-SOL area is much longer than that in the core. Significant co-current flow is driven solely by the electron cyclotron wave in the far-SOL flow. Sheared flow is also observed in the perpendicular velocity profile during the recovered current flat-top phase, and such flow profiles are flattened by SGP. These flow profiles are attributed not only to drift-driven flow but also to transport-driven flow, the sink effect on the end-plate, and the balance of the neutral particle source.

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Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy

Yoneda

Shikama

Hanada

et al. 2021

Nuclear Materials and Energy

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Origin and Evolution of Spontaneous Rotation in Plasma Under Different Magnetic Field Geometries in Tokamak QUEST

Cited by 4 publications

References 16 publications

Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Response of the far scrape-off layer plasma to strong gas puffing in the high poloidal beta configuration of the QUEST spherical tokamak

Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy

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