Design of a Feedback Control System for Keda Torus Experiment Equilibrium Field Power Supply

Bai, Wei; Lan, Tao; Lee, Yang; Xiao, C.; Li, Hong; Mao, Wenzhe; You, Wei; Xu, Henghui; Deng, Tijian; Zhu, Jiawei; Luo, Bing; Fu, Peng; Xu, Wen; Zhou, Haiyang; Wang, Hai; Wan, Shude; Liu, Adi; Xie, Jinlin; Ding, Weixing; Liu, Wandong

doi:10.1080/15361055.2017.1291043

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…The KTX is a new RFP device with a major radius of R = 1.4 m and a minor radius of a = 0.4 m. [9,[11][12][13] The materials of the first wall and limiter are stainless steel and molybdenum, respectively. The height of the poloidal and toroidal molybdenum limiters is 2 cm.…”

Section: Experimental Setup and Laboratory Testsmentioning

confidence: 99%

Construction of an H α diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment*

Zhu¹,

Lan²,

Zhuang³

et al. 2019

Chinese Phys. B

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A 10-channel H α diagnostic system has been designed with the rapid response rate of 300 kHz, spatial resolution of about 40 mm, and overlap between adjacent channels of about 3%, and it has been implemented successfully on Keda Torus eXperiment (KTX), a newly constructed, reversed field pinch (RFP) experimental device at the University of Science and Technology of China (USTC). This diagnostic system is a very important tool for the initial KTX operations. It is compact, with an aperture slit replacing the traditional optical lens system. A flexural interference filter is designed to prevent the center wavelength from shifting too much as the increase of angle from vertical incidence. To eliminate the stray light, the interior of the system is covered with the black aluminum foil having a very high absorptivity. Using the H α emission data, together with the profiles of electron temperature and density obtained from the Langmuir probe, the neutral density profiles have been calculated for KTX plasmas. The rapid response rate and good spatial resolution of this H α diagnostic system will be beneficial for many studies in RFP plasma physics.

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Section: Experimental Setup and Laboratory Testsmentioning

confidence: 99%

Construction of an H α diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment*

Zhu¹,

Lan²,

Zhuang³

et al. 2019

Chinese Phys. B

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“…The KTX power supply system includes ohmic heating power supply (OHPS), equilibrium field power supply (EQPS), and toroidal field power supply (TFPS) [22]. In particular, the EQPS has been designed and will be manufactured in the next phase [23]. Both OHPS and TFPS are based on the thyristor and energy storage capacitors.…”

Section: Power Supply Systemsmentioning

confidence: 99%

Overview of Keda Torus eXperiment initial results

et al. 2017

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The Keda Torus eXperiment (KTX) is a new reversed field pinch (RFP) device at the University of Science and Technology of China. The construction and assembly of KTX, including the vacuum chamber, conducting shell, magnetic field windings, power supply system, active control coils, vacuum pump and data acquisition system, have been completed on August 1, 2015. Immediately following that, the first plasma was obtained on August 15, 2015. Intensive conditioning of the machine is underway to ramp up the plasma current toward its full operation. An active feedback mode control system has been built and has been implemented to control the error field around the vertical gaps of the conducting shell. The pulsed power supply systems of ohmic heating field and toroidal field (TF), using thyristor and energy storage capacitors, have been tested and commissioned. The TF power supply has flexibility in being able to operate with a reversed TF configuration and stable TF configuration. The fundamental diagnostic tools are developed for early KTX operation. Currently, the plasma current is up to 205 kA and the maximum discharge length is 21 ms, approaching to the conducting shell penetration time. Furthermore, typical RFP discharges are being produced with RFP state lasting 2 ms. These initial operation results for KTX are described in detail.

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“…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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Design of a Feedback Control System for Keda Torus Experiment Equilibrium Field Power Supply

Cited by 5 publications

References 26 publications

Construction of an H α diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment*

Construction of an H α diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment*

Overview of Keda Torus eXperiment initial results

Fast radial scanning probe system on KTX

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