Construction of the HL-2A tokamak

Liu, Dequan; Zhou, Caipin; Cao, Z.; Yan, Jing; Liu, Yong

doi:10.1016/s0920-3796(03)00165-0

Cited by 31 publications

(12 citation statements)

References 3 publications

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“…This study is based on data obtained from the HL-2A tokamak, a medium-sized device with a major radius (R) of 1.65 m and a minor radius (a) of 0.4 m. [36] The tokamak is equipped with a toroidal magnetic field ranging from 1.2 T to 2.7 T and is capable of generating plasma currents of up to 480 kA. The versatility of HL-2A allows for the investigation of non-local transport effects through various experimental techniques, including modulated electron cyclotron heating (ECH), supersonic molecular beam injection (SMBI), pellet injection, gas puffing, fast current ramps, and laser blowoff.…”

Section: Methodsmentioning

confidence: 99%

Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Shi 石,

Fang 方,

Li 李

et al. 2024

Chinese Phys. B

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The dynamics of long-wavelength ($k_\theta<1.4 \mathrm{\ cm^{-1}}$), broadband (20-200 kHz) electron temperature fluctuations ($\tilde T_e/T_e$) of plasmas in gas-puff experiments were observed for the first time in HL-2A tokamak. In a relative low density ($n_e(0) \simeq 0.91 \sim 1.20 \times10^{19}/m^3$) scenario, after gas-puffing the core temperature increases and the edge temperature drops. On the contrary, temperature fluctuation drops at the core and increases at the edge. Analyses show the non-local emergence is accompanied with a long radial coherent length of turbulent fluctuations. While in a higher density ($n_e(0) \simeq 1.83 \sim 2.02 \times10^{19}/m^3$) scenario, the phenomena were not observed. Furthermore, compelling evidence indicates that $\textbf{E} \times \textbf{B}$ shear serves as a substantial contributor to this extensive radial interaction. This finding offers a direct explanatory link to the intriguing core-heating phenomenon witnessed within the realm of non-local transport.

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Section: Methodsmentioning

confidence: 99%

Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Shi 石,

Fang 方,

Li 李

et al. 2024

Chinese Phys. B

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“…The vacuum vessel, 16 toroidal field coils, poloidal field coil systems and supporting structure of the former ASDEX are adapted for HL-2A [12]. The other subsystems of HL-2A, including the pumping system, cooling system, power supply system, diagnostics system and auxiliary heating system have been designed and have been or are being constructed to meet the requirements of the experiment programme at HL-2A.…”

Section: Progress Of the Hl-2a Projectmentioning

confidence: 99%

Recent experimental results from the HL-1M tokamak and progress in the HL-2A project

Liu

Yan²,

Zhou³

et al. 2004

Nucl. Fusion

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Recent experimental results from the HL-1M tokamak and progress in the HL-2A project are presented in this paper. In HL-1M, strong fishbone instability was observed during off-axis electron cyclotron resonance heating (ECRH). This is the first observation of fishbone instability purely driven by energetic electrons produced by ECRH. The molecular beam injection (MBI) was first proposed and demonstrated in HL-1M. Recently, new results of the MBI experiment were obtained by increasing the pressure of the gas. A stair-shaped density increment was obtained with high-pressure multi-pulse MBI just like the density evolution behaviour during multi-pellet injection. It is shown that injected particles penetrated into the core region of the plasma. HL-2A is a divertor tokamak constructed at SWIP based on the original ASDEX main components. The mission of the HL-2A project is to explore the physics issues involved in an advanced tokamak. For the first phase, divertor (edge plasma) and confinement research will be emphasized. The major parameters of HL-2A are R = 1.65 m, a = 0.4 m, B t = 2.8 T, I P = 0.48 MA. The main parameters and characteristics of the subsystems such as power supply, pumping, diagnostics and auxiliary heating are presented in this paper. The first plasma of HL-2A was obtained at the end of 2002.

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“…The sensors of the HL-2A magnetic diagnostic system, such as inductive loops and Rogowski coils, acquire induced voltage signals when integrators are required to convert the voltages to magnetic fluxes or plasma currents [4]. Accuracy of the integrators is of great impact on quality of the diagnostics.…”

Section: Introductionmentioning

confidence: 99%

A multi-channel real-time digital integrator for magnetic diagnostics in HL-2A tokamak

et al. 2016

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A novel full-digital integrator has been developed for the magnetic diagnostics in HL-2A. Based on the pipeline processing of the field-programmable gate array and high-speed PCI extensions for instrumentation platform, the digital integrator has realized octal-channel 10-kHz real-time integration and data transmission. In order to reduce the integration drift, a 24-bit analog-todigital converter and simple analog processing circuits are applied for high-precision sampling, while certain correction algorithms are used to minimize the drift. With simple and highly integrated circuits and high-performance digital processor, the digital integrator is of high stability and functional expansibility which greatly simplifies the operation procedure. The digital integrator has been tested in the plasma discharge experiments, and the experimental results have confirmed that the drift performance and accuracy of the digital integrator could fully meet the requirements of HL-2A.

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Construction of the HL-2A tokamak

Cited by 31 publications

References 3 publications

Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Recent experimental results from the HL-1M tokamak and progress in the HL-2A project

A multi-channel real-time digital integrator for magnetic diagnostics in HL-2A tokamak

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