Progress of the Keda Torus eXperiment Project in China: design and mission

Liu, Wandong; Mao, Wenzhe; Li, Hong; Xie, Jinlin; Lan, Tao; Liu, Ahdi; Wan, Shude; Wang, Hai; Zheng, Jian Guo; Xu, Wen; Zhou, Haiyang; You, Wei; Li, Chenguang; Bai, Wei; Tu, Cui; Tan, Manqing; Luo, Bing; Fu, Chuhan; Huang, Fangcheng; Xiao, Bingjia; Luo, Zhaohua; Shen, Biao; Fu, Peng; Lee, Yang; Song, Yuntao; Yang, Qingxi; Zheng, Jinxing; Xu, H.; Zhang, Ping; Xiao, C.; Ding, W. X.

doi:10.1088/0741-3335/56/9/094009

Cited by 44 publications

(37 citation statements)

References 48 publications

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“…In this work, we use the 3D full MHD code NIMROD [28] to evaluate the possibilities of achieve QSH state in the newly constructed RFP device KTX, which is a middle-sized torus, with major radius R 0 = 1.4 m, minor radius a = 0.4 m, and a designed maximum plasma current of 1 MA [29]. With 96 saddle coils installed outside of its copper shell, KTX is mainly designed to explore novel magnetic confinement regimes and advanced feedback control schemes for MHD instabilities, along with 3D physics.…”

Section: Introductionmentioning

confidence: 99%

Resistive MHD modelling of the quasi-single helicity state in the KTX regimes

Luo

Zhu

et al. 2017

Nucl. Fusion

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The potential formation of the quasi-single-helicity (QSH) state in the Keda Torus eXperiment (KTX) is investigated in resistive MHD simulations using the NIMROD code. We focus on the effects of finite resistivity on the mode structure and characteristics of the dominant linear and nonlinear resistive tearing-mode in a finite β, cylindrical configuration of reversed field pinch model for KTX. In the typical resistive regimes of KTX where Lundquist number S = 5 × 10 4 , the plasma transitions to a steady QSH state after evolving through an initial transient phase with multiple helicities. The dominant mode of the QSH state develops from the dominant linear tearing mode instability. In lower β regime, the QSH state are intermittent and short in duration; in higher β regime, the QSH state persists for a longer time and should be more observable in experiment.

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Section: Introductionmentioning

confidence: 99%

Resistive MHD modelling of the quasi-single helicity state in the KTX regimes

Luo

Zhu

et al. 2017

Nucl. Fusion

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“…The world's other RFP experiments are RFX-mod in Italy, Extrap-T2R in Sweden, and RELAX in Japan. A new RFP experiment called KTX is under construction at the University of Science and Technology, Hefei, China, and is anticipated to begin operation in 2015 [2]. The RFP magnetic configuration offers several potential advantages for fusion.…”

Section: Introductionmentioning

confidence: 99%

Overview of results from the MST reversed field pinch experiment

Sarff¹,

Almagri²,

Anderson³

et al. 2015

Nucl. Fusion

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An overview of recent results from the MST reversed field pinch programme is presented. With neutral beam injection, bursty energetic particle (EP) modes are observed. The profiles of the magnetic and density fluctuations associated with these EP modes are measured using a far infrared interferometer-polarimeter. Equilibrium reconstructions of the quasi-single-helicity 3D helical state are provided by the V3FIT code that now incorporates several of MST's advanced diagnostics. The orientation of the helical structure is controlled using a new resonant magnetic perturbation technique. Gyrokinetic simulations based on experimental equilibria predict unstable trapped-electron modes (TEMs), and small-scale density fluctuations are detected in improvedconfinement plasmas with TEM-like features. Upgraded pellet injection permits study of density and beta limits over MST's full range of operation, and an MST-record line-average density of 0.9 × 10 20 m 3 (n/n G = 1.4) has been obtained. Impurity ion temperature measurements reveal a charge-to-mass-ratio dependence in the rapid heating that occurs during a sawtooth crash. Runaway of NBI-born fast ions during the impulsive sawtooth event agrees with test-particle theory. Magnetic self-organization studies include measurements of the dynamo emf with an applied ac inductive electric field using oscillating field current drive.

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“…Regrettably, not all current devices possess the capability to measure eddy currents on the entire closed wall during experiments. Nevertheless, the Keda Torus eXperiment (KTX) [16], equipped with the eddy current diagnostic system (ECDS) [17], stands out as an exception with this measurement capability. The ECDS operates based on Ampere's law, a fundamental principle of eddy current diagnostics, and the design and preliminary experimental results of the system are showcased [18].…”

Section: Introductionmentioning

confidence: 99%

Data analysis methods and applications of the eddy current diagnostic system in the Keda Torus eXperiment device

Chen,

Tao,

Yolbarsop

et al. 2024

J. Inst.

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Since the establishment of the eddy current diagnostic system within the Keda Torus eXperiment (KTX) device, it has unveiled many applications. Recent developments have introduced innovative data analysis techniques alongside compelling experimental results, underscoring the necessity for a comprehensive summary of the system's data analysis approaches and broad applications. Notable features of the system encompass exceptional precision, the ability to encompass shell currents on the entirety of the closed boundary, vector detection of shell currents, and measurement of diverse physical quantities. In terms of data analysis methodologies, meticulous scrutiny of the null field region is conducted, and we reveal a distinctive characteristic within the complex shell current signals, namely the asymmetry of the amplitudes of ±n Fourier coefficients. Moreover, the Hodge decomposition emerges as a pivotal technique, allowing for the distinctive separation of shell currents into three orthogonal components based on their distinct spatial topological properties. With regard to practical applications, an in-depth examination of the vector potential and magnetic helicity flux densities are presented in detail, further highlighting the far-reaching utility of the system's capabilities.

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Progress of the Keda Torus eXperiment Project in China: design and mission

Cited by 44 publications

References 48 publications

Resistive MHD modelling of the quasi-single helicity state in the KTX regimes

Resistive MHD modelling of the quasi-single helicity state in the KTX regimes

Overview of results from the MST reversed field pinch experiment

Data analysis methods and applications of the eddy current diagnostic system in the Keda Torus eXperiment device

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