Magnetic island dynamics in magnetic reconnection in UTST experiments

Kamio, S.; Inomoto, Michiaki; Yamasaki, K.; Yamada, Teppei; Cheng, C. Z.; Ono, Yasushi

doi:10.1063/1.5006092

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…In comparison with a no guide field experiment (χ i /χ i ⊥ ∼ 1 [53]), tokamak merging typically satisfies χ i /χ i ⊥ > 10 even on the low field side and has a characteristic hollow distribution. Although the initial heating profile is poloidally localized and is not necessary symmetric (typically high temperatures occur in high field side because of a smaller volume in the toroidal configuration and radially asymmetric acceleration [54][55][56]), its equilibration process to form poloidally-ring-like hollow distribution has successfully been visualized/demonstrated as shown in Fig. 8.…”

Section: Ion Heating and Transport Process During Tokamak Merging In mentioning

confidence: 99%

Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3

Tanabe

Cao

Tanaka

et al. 2019

Plasma and Fusion Research

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We present recent results from high resolution 2D imaging measurement of reconnection heating during central solenoid (CS)-free merging startup of spherical tokamak plasmas in TS-3 using an ultra-high resolution 2D ion Doppler tomography and in-situ 2D magnetic probe arrays. The new high-resolution 2D ion Doppler tomography diagnostic has successfully resolved the formation of fine structure during magnetic reconnection and it has been found that magnetic reconnection increases the ion temperature inside a current sheet as well as in the downstream region of an outflow jet. The maximum ion temperature is obtained during a current sheet ejection event and the double peak structure of ion heating becomes clearer after the end of reconnection. The maximum ion heating increases with the reconnecting magnetic field. The high temperature region in the downstream typically propagates vertically along a closed flux surface and MAST-like fine structure formation has successfully been reproduced in this laboratory experiment for the first time.

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Section: Ion Heating and Transport Process During Tokamak Merging In mentioning

confidence: 99%

Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3

Tanabe

Cao

Tanaka

et al. 2019

Plasma and Fusion Research

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Ion heating/transport characteristics of the merging startup plasma scenario in the TS-6 spherical tokamak

Tanabe,

Cai,

Tanaka

et al. 2024

Nucl. Fusion

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Here we report ion heating/transport characteristics of merging startup scenario in the TS-6 spherical tokamak. In addition to the previously investigated impulsive heating process during magnetic reconnection, here we also focused on a longer time scale response of ion temperature profile both during and after merging including the semi-steady plasma confinement phase. During magnetic reconnection, (i) ion temperature profile forms poloidally asymmetric profile around the X-point at the initiation phase and (ii) radially asymmetric higher deposition is obtained in the high field side. After merging, (iii) the radially asymmetric double-peak structure is affected by parallel heat conduction and is aligned with field lines, but it does not simply become flux function in microsecond time scale: inboard/outboard asymmetry lasts even in the semi-steady confinement phase. (iv) Under the influence of low aspect ratio configuration, there is 2~3 times higher toroidal field in the high field side on a same closed flux surface, characteristic asymmetry of inboard/outboard ion temperature has experimentally been found for the first time.

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Intermittent Electron-only Reconnection at Lunar Mini-magnetospheres

Stanier,

Chen,

et al. 2024

ApJL

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Lunar crustal magnetic anomalies (LCMA) are sub-ion-gyroradius structures that have been shown to stand off the solar wind (SW) plasma from the Moon’s surface, forming shock-like discontinuities and reflecting incident SW protons. In this Letter, the results of high-resolution, 2D fully kinetic simulations show a bursty electron-only magnetic reconnection in the SW-LCMA interaction region, characterized by the quasiperiodic formation and ejection of magnetic islands and strong parallel electron flows along the X-point separator lines. The islands are observed to modify the magnetic pressure pileup and Hall electric field above the LCMA, leading to sharp increases in reflected protons that drive electromagnetic fluctuations downstream and short distances upstream in the SW.

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Magnetic island dynamics in magnetic reconnection in UTST experiments

Cited by 3 publications

References 17 publications

Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3

Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3

Ion heating/transport characteristics of the merging startup plasma scenario in the TS-6 spherical tokamak

Intermittent Electron-only Reconnection at Lunar Mini-magnetospheres

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