Design of the poloidal field system for KTX

You, Wei; Li, Hong; Mao, Wenzhe

doi:10.1088/2058-6272/aac8d5

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…An optimization method for the breakdown based on the inverse reconstruction of magnetic fluxes has been investigated in the JT-60SA [21]. To achieve the optimal null field region, a specially designed poloidal field system was implemented for the KTX device [22]. Note that experimental examination of the null field region is necessary to study stray fields generated by external currents.…”

Section: Closed Boundary Analysismentioning

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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Section: Closed Boundary Analysismentioning

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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“…In contrast, the magnetic grating ruler can bear very high speeds and shocks without contact. The probe system is in the 'nearly zero' magnetic field region less than 20 Gauss in the middle plane, and the discharge magnetic field influence on the magnetic grating ruler can be ignored [29]. The output signals of the magnetic grating ruler are two quadrature TTL pulse time serials, which implement a minimum measurement resolution of 5 μm and determine the direction of movement.…”

Section: Control and Data Acquisition Systemsmentioning

confidence: 99%

“…Early reversed field pinches (RFPs) [10][11][12][13] have rarely equipped with reciprocating probe due to short discharge durations. However, a plasma profile diagnostic tool is urgently needed for Keda Torus eXperiment (KTX) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] RFP. According to the experiences on tokamaks, a fast scanning probe system is designed to measure the plasma edge potential, density, and temperature profiles on the KTX RFP.…”

Section: Introductionmentioning

confidence: 99%

Fast radial scanning probe system on KTX

Deng¹,

Lan²,

Tan³

2020

Plasma Sci. Technol.

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A fast radial scanning probe system was constructed for the Keda Torus eXperiment (KTX) to measure the profiles of boundary plasma parameters such as floating potential, electron density, temperature, transport fluxes, etc. The scanning probe system is driven by slow and fast motion mechanisms, corresponding to the stand-by movement of a stepping motor and the fast scanning movement of a high-torque servo-motor, respectively. In fast scanning, the scanner drives the probe radially up to 20 cm at a maximum velocity of 4.0 m s −1 . A noncontact magnetic grating ruler with a high spatial resolution of 5 μm is used for the displacement measurement. New scanning probe can reach the center of plasmas rapidly. The comparison of plasma floating potential profiles obtained by a fixed radial rake probe and the single scanning probe suggests that the high-speed scanning probe system is reliable for measuring edge plasma parameter profiles on the KTX device.

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A parametric method for correcting polluted plasma current signal and its application on Keda Torus eXperiment

Deng

Lan

et al. 2019

Review of Scientific Instruments

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We have developed a parametric method for eliminating the background component of the plasma current, which is measured by a Rogowski coil and polluted by the toroidal magnetic field in the vacuum vessel of the Keda Torus eXperiment (KTX) reversed field pinch (RFP) device. The method considers the toroidal magnetic field windings, the KTX vacuum chamber, and the Rogowski coil as a linear time-invariant system; in this case, a constant frequency response function characterizes the system. Using this response function, the current component caused by pollution from the toroidal magnetic field can be predicted exactly for an arbitrary input current to the toroidal magnetic field windings. Compared with the traditional proportional compensation method, the proposed method has great flexibility and universality and it is potentially applicable to cases in which the toroidal field current signal changes over time with plasma feedback signals. Furthermore, the method can be applied to other similarly affected signals, such as magnetic field signals. As an example, we have corrected the poloidal and toroidal magnetic field signals better to reveal the true physical processes for the RFP state.

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Design of the poloidal field system for KTX

Cited by 4 publications

References 15 publications

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

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

Fast radial scanning probe system on KTX

A parametric method for correcting polluted plasma current signal and its application on Keda Torus eXperiment

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