An overview of diagnostic upgrade and experimental progress in the KTX

Liu, Wandong; Mao, Wenzhe; Lan, Tao; Zhuang, G.; Zheng, Jian; Yuan, Peng; Li, Hong; Xie, Jinlin; Liu, Ahdi; Wu, Zhengwei; Liu, Zixi; Wan, Shude; Wang, Hai; Xu, Wen; Zhou, Haiyang; Wei, Zhuangzhuang; You, Wei; Tu, Cui; Tan, Manqing; Li, Zichao; Adil, Yolbarsop; Xu, Henghui; Deng, Tijian; Zhu, Jiawei; Chen, Chen; Zhang, Sen; Wu, Jiadi; Zu, Yiming; Luo, Bing; Xiao, C.; Ding, Weixing

doi:10.1088/1741-4326/ab168c

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…The unique double-C design of the KTX vacuum vessel allows access to the interior of the machine for rapid first-wall (FW) modifications and investigations of power and particle handling. The KTX device provides a platform to develop diagnostic tools [18] and to investigate the fluctuation induced transport in high temperature plasmas.…”

Section: The Rfp Devicesmentioning

confidence: 99%

The reversed field pinch

et al. 2021

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This paper reviews the research on the reversed field pinch (RFP) in the last three decades. Substantial experimental and theoretical progress and transformational changes have been achieved since the last review (Bodin 1990 Nucl. Fusion 30 1717–37). The experiments have been performed in devices with different sizes and capabilities. The largest are RFX-mod in Padova (Italy) and MST in Madison (USA). The experimental community includes also EXTRAP-T2R in Sweden, RELAX in Japan and KTX in China. Impressive improvements in the performance are the result of exploration of two lines: the high current operation (up to 2 MA) with the spontaneous occurrence of helical equilibria with good magnetic flux surfaces and the active control of the current profile. A crucial ingredient for the advancements obtained in the experiments has been the development of state-of-art active feedback control systems allowing the control of MHD instabilities in presence of a thin shell. The balance between achievements and still open issues leads us to the conclusion that the RFP can be a valuable and diverse contributor in the quest for fusion electricity.

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Section: The Rfp Devicesmentioning

confidence: 99%

The reversed field pinch

et al. 2021

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“…Reports on interactions between CT and reversed field pinch (RFP) plasma are scarce. This paper describes a new compact torus injector (KTX-CTI) developed for the Keda Torus eXperiment (KTX) [12,13]. KTX is a medium-sized RFP device with a major radius of 1.4 m and a minor radius of 0.4 m. KTX can be operated in the RFP discharge as well as the tokamak discharge [12].…”

Section: Introductionmentioning

confidence: 99%

“…Understanding magnetic helicity transport is essential for RFP plasma studies [14]. Single helicity and three-dimensional RFP physics will be an important research topic for the KTX facility [13]. In addition to upgrading KTX capability [13], it has been hypothesized that the CT injection might improve the plasma performance and facilitate a prolonged RFP state due to helicity and tangential momentum injections.…”

Section: Introductionmentioning

confidence: 99%

Development of a compact torus injection system for the Keda Torus eXperiment

Chen

Lan

Xiao

et al. 2022

Plasma Sci. Technol.

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A compact torus injection system, KTX-CTI, has been developed for the planned injection experiments on the Keda Torus eXperiment (KTX) reversed field pinch (RFP) device to investigate the physics and engineering issues associated with interaction between a compact torus (CT) and RFP. The key interests include fueling directly into the reactor center, confinement improvement, and injection of momentum and helicity into the RFP discharges. The CT velocity and mass have been measured using a multichannel optical fiber interferometer, and for the first time the time evolution of CT density profile during CT propagation is obtained. The number of injected particles, the CT velocity and density on the discharge parameters have been characterized: the maximum hydrogen CT plasma mass, m_CT, is 50 μg, corresponding to 30% of the mass in a typical KTX plasma; the CT velocity exceed 120 km/s. It is firstly observed that multiple CTs can be produced and emitted during the very short period (<100 μs) in one discharge, which is significant for the future study of repetitive CT injection, even with an ultra-high frequency.

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“…Solid-state sourcebased systems possess unique advantage due to compact size [10], flexible frequency modulation, and easy maintenance. Following on our previous work on a multi-channel interferometer using two terahertz microwave sources [11], the system is upgraded to a three-wave Faraday-effect polarimeter-interferometer for simultaneous measurement of electron density and vertical magnetic field along the beam direction in the Keda Torus eXperiment (KTX) [12].…”

Section: Introductionmentioning

confidence: 99%

Polarimeter–interferometer diagnostic using terahertz solid-state sources for fluctuation measurements on Keda Torus eXperiment (KTX)

WANG 汪,

MAO 毛,

XIE 谢

et al. 2024

Plasma Sci. Technol.

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A multi-channel polarimeter-interferometer has been developed on the Keda Torus eXperiment (KTX) for the study of equilibrium dynamics and internal magnetic fluctuations. Three-wave technique based on terahertz solid state sources (~650 GHz) is applied for simultaneous measurements of electron density and Faraday rotation angle. The output power of the microwave source is 2 mW. Faraday rotation effect using a rotating wave plate is tested with phase noise less than 0.8°, and the density phase noise is less than 0.9°. Measurement of Faraday rotation angle and density for discharges on KTX have demonstrated high sensitivity to internal MHD activities.

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An overview of diagnostic upgrade and experimental progress in the KTX

Cited by 16 publications

References 42 publications

The reversed field pinch

The reversed field pinch

Development of a compact torus injection system for the Keda Torus eXperiment

Polarimeter–interferometer diagnostic using terahertz solid-state sources for fluctuation measurements on Keda Torus eXperiment (KTX)

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