Plans for the electron cyclotron heating system on J-TEXT

Xia, Ding; Liu, C. H.; Jin, Yuchen; Y., H.; Tian, Yifei; Wang, Z. J.

doi:10.1051/epjconf/201920304017

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…The divertor configuration will be tested using the high-field X-point configuration and the island divertor concept [74], respectively. The 105 GHz/0.5 MW/1 s ECRH system will be commissioned in 2019 [75]. It will support the plasma heating, current drive and hence disruption and MHD instability control.…”

Section: Discussionmentioning

confidence: 99%

Overview of the recent experimental research on the J-TEXT tokamak

et al. 2019

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Recent J-TEXT research has highlighted the significance of the role that non-axisymmetric magnetic perturbations, so called three-dimensional (3D) magnetic perturbation (MP) fields, play in a fundamentally 2D concept, i.e. tokamaks. This paper presents the J-TEXT results achieved over the last two years, especially on the impacts of 3D MP fields on magnetohydrodynamic instabilities, plasma disruptions and plasma turbulence transport. On J-TEXT, the resonant MP (RMP) system, capable of providing either a static or a high frequency (up to 8 kHz) rotating RMP field, has been upgraded by adding a new set of 12 in-vessel saddle coils. The shattered pellet injection system was built in J-TEXT in the spring of 2018. The new capabilities advance J-TEXT to be at the forefront of international magnetic fusion facilities, allowing flexible study of 3D effects and disruption mitigation in a tokamak. The fast rotating RMP field has been successfully applied for avoidance of mode locking and the prevention of plasma disruption. A new control strategy, which applies pulsed RMP to the tearing mode only during the accelerating phase region, was proved by nonlinear numerical modelling to be efficient in accelerating mode rotation and even completely suppresses the mode. Remarkably, the rotating tearing mode was completely suppressed by the electrode biasing. The impacts of 3D magnetic topology on the turbulence has been investigated on J-TEXT. It is found that the fluctuations of electron density, electron temperature and plasma potential can be significantly modulated by the island structure, and a larger fluctuation level appears at the X-point of islands. The suppression of runaway electrons during disruptions is essential to the operation of ITER, and it has been reached by utilizing the 3D magnetic perturbations on J-TEXT. This may provide an alternative mechanism of runaway suppression for large-scale tokamaks and ITER.

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Section: Discussionmentioning

confidence: 99%

Overview of the recent experimental research on the J-TEXT tokamak

et al. 2019

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“…Its control system is designed according to the J-TEXT CODAC (Control, Data Access, and Communication) standard [5]. The DV coils parameters and power requirements are listed in the previous work [6], which was inspired by the ITER CODAC and ITER instrumentation and control system. Because the national power grid cannot meet the pulse power requirements of the system, a 100 MW/ 6.9 kV/80 Hz pulse generator drives the DV power supply.…”

Section: Magnet and Power Systemmentioning

confidence: 99%

“…A 105 GHz electron cyclotron resonant heating system (ECRH) has newly been constructed in the J-TEXT tokamak [6], which is also tested in the divertor configuration discharge. The ECRH is launched in the 2nd harmonic X-mode from the low-field side.…”

Section: Ecrh Experimentsmentioning

confidence: 99%

Realization of divertor configuration discharge in J-TEXT tokamak

Chen¹,

Zhu²,

Xu³

et al. 2022

Plasma Sci. Technol.

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To extend the operation region of the Joint-Texas Experimental tokamak (J-TEXT) to the divertor configuration and even H-mode, the divertor configuration discharge has been realized for the first time in J-TEXT tokamak. Along with establishing a power supply for divertor configuration, the construction of relevant diagnostics, and the installation of the divertor target in the high-field side, the divertor discharge has been tested. And through the equilibrium calculation and position stability analysis, the control strategy has been evolved to be more stable. High-density experiments and auxiliary heating experiments have been carried out in the divertor configuration. The special midplane single-null (MSN) divertor configuration exhibits to be more stable than the limiter configuration in the density limit condition and can reach a higher density in the experiment. In the ECRH experiment, the power injection enhances the electron temperature and density, while more heat outflux is loaded on the divertor target tiles and causes more intensive recycling and impurity release. The future plan of the divertor configuration operation in J-TEXT tokamak is also included.

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Plans for the electron cyclotron heating system on J-TEXT

Cited by 2 publications

References 11 publications

Overview of the recent experimental research on the J-TEXT tokamak

Overview of the recent experimental research on the J-TEXT tokamak

Realization of divertor configuration discharge in J-TEXT tokamak

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