The measurements by diamagnetic loops in EAST

Jia, Tiekun; He, Kang; Chen, D.L.; Qian, Jinping; Gu, Xiaojing; Shen, Biao; Sun, Youwen; Shi, Tonghui; Wang, Y.; Zhang, Bin; Gong, Xianzu

doi:10.1016/j.fusengdes.2022.113091

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…The system uses the compensation coil signal to compensate the toroidal field signal, which is also measured by the diamagnetic coil, remove the stray signal and obtain the real diamagnetic signal. [12,13] Diamagnetic loops Plasma Vacuum chamber The flux linked to the inner loop during a plasma discharge can be expressed as…”

Section: Diamagnetic Loopsmentioning

confidence: 99%

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Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Chen¹,

Shen²,

Chen³

et al. 2022

Chinese Phys. B

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HT-6M tokamak is restarted for Thailand Institute of Nuclear Technology, TINT. In order to ensure the smooth breakdown of plasma and obtain plasma discharge parameters, the optimization of poloidal field coils and upgrade of magnetic diagnostics are described in this article. A perfect null field (the stray field in main chamber < 10G) is obtained using ohmic heating field. To get the main information of plasma, an external magnetic diagnostics system is designed and calibrated, including Rogowski coil (measuring plasma current), magnetic probe (measuring external field), diamagnetic loops (measuring β p ) and so on. Besides, in order to realize high frequency signal measurement and transmission, a series of frequency response with the magnetic probe and transmission line are tested. Later in the paper, to verify the null field, a fitting code was developed to reconstruct the stray field in vacuum chamber based on measured magnetic probes and flux loops. The result shows the error is within 1.5%. This indicates the accuracy of the magnetic measurement system and ensures the preparation for the breakdown of plasma.

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Section: Diamagnetic Loopsmentioning

confidence: 99%

“…Section 3 discusses the design of each inductive sensor, for example Rogowski loops, [10] flux loops, magnetic probes, [11] and diamagnetic loops. [12,13] Section 4 describes the calibration and experimental results of the magnetic sensors.…”

Section: Introductionmentioning

confidence: 99%

Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Chen¹,

Shen²,

Chen³

et al. 2022

Chinese Phys. B

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Equilibrium reconstruction of axisymmetric plasmas by combining Gaussian process regression and Markov chain Monte Carlo sampling

Nishizawa,

Tokuda,

Sanpei

et al. 2024

Plasma Phys. Control. Fusion

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Reliable equilibrium reconstruction is indispensable for understanding and controlling hot magnetized plasmas to achieve fusion reactors. In axisymmetric systems, current and pressure profiles that satisfy the force balance conditions are given by the Grad-Shafranov (GS) equation. While many novel approaches have been developed to swiftly and robustly find an optimum solution of the GS equation, approaches based on a single solution search may not be adaptable if diagnostics fail to provide sufficient constraints. Here, we investigate the solution space of the GS equation when only basic edge magnetic measurements are available. By combining Gaussian process regression and Markov chain Monte Carlo sampling within the Bayesian framework, we treat each current element as an independent variable and evaluate the probability distribution that describes all possible solutions. We have applied this inference frame to the geometry of the PLATO tokamak and shown that the flux surface locations can be determined relatively well only from 16 pick-up coils, 4 flux loops and a diamagnetic loop. On the other hand, the toroidal current density is inferred with limited success, and the inferences of the safety factor and pressure profiles are difficult. The characterization of possible choices of equilibria realized by this inference frame will help optimize diagnostic setups for equilibrium reconstruction.

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The measurements by diamagnetic loops in EAST

Cited by 2 publications

References 34 publications

Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Equilibrium reconstruction of axisymmetric plasmas by combining Gaussian process regression and Markov chain Monte Carlo sampling

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