First Divertor Operation on the HL-2A Tokamak

Qi, Yang; Ding, X.T.; Longwen, Yan; Weimin, Xuan; Liu, Dequan; Chen, Liaoyuan; Xianming, Song; Baoshan, Yuan; Zhang, Jinhua; Zeng, Cao; Li, Xiaodong; Weicheng, Mao; Caipin, Zhou; Enyao, Wang; Yan, Jing; Liu, Yong; Team, Hl A

doi:10.1088/0256-307x/21/12/043

Cited by 19 publications

(2 citation statements)

References 4 publications

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“…A GPI diagnostic with high speed camera has been developed on the HL-2A tokamak [18], a conventional tokamak (minor radius a = 40cm, major radius R = 165cm) that operates in limiter Figure 1 shows the diagrammatic sketch of the GPI diagnostic on the HL-2A tokamak. A neutral gas cloud is puffed at the edge of the plasma through a nozzle installed on the vacuum chamber wall.…”

Section: Diagnostic Setupmentioning

confidence: 99%

“…The results of GPI diagnostic and Langmuir probes experiments on the TEXTOR tokamak prove that in the edge region the emission depends more on local electron density than temperature, especially at high frequency band [11]. A GPI diagnostic with high speed camera has been developed on the HL-2A tokamak [18], a conventional tokamak (minor radius a = 40 cm, major radius R = 165 cm) that operates in limiter mode or diverter mode. In experiments, typical plasma current is I P = (150 − 450) kA, toroidal magnetic field B T = (1.35 − 2.7) T and line-average electron density n e0 = (1 − 8) × 10 19 m −3 .…”

Section: Gas Puff Imaging Diagnostic 21 Principlementioning

confidence: 99%

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Development of a new gas puff imaging diagnostic on the HL-2A tokamak

Yuan

et al. 2018

J. Inst.

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A new gas puff imaging (GPI) diagnostic has been developed on the HL-2A tokamak to study two-dimensional plasma edge turbulence in poloidal vs. radial plane. During a discharge, neutral helium or deuterium gas is puffed at the edge of the plasma through a rectangular multicapillary nozzle to generate a gas cloud on the observing plane. Then a specially designed telescope and a high-speed camera are used to observe and photograph the emission from the neutral gas cloud. The brightness and contrast in the 2-D poloidal vs. radial frames reveal the structures and movements of the turbulence. The diagnostic was put into the first experiment during the latest campaign and successfully captured blob structures of different shapes and sizes in scrape-off layer (SOL).

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Section: Diagnostic Setupmentioning

confidence: 99%

Section: Gas Puff Imaging Diagnostic 21 Principlementioning

confidence: 99%

Development of a new gas puff imaging diagnostic on the HL-2A tokamak

Yuan

et al. 2018

J. Inst.

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Design and development of the power supply system for HL-2A tokamak

Yao

Weimin

et al. 2005

Fusion Engineering and Design

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Overview of HL-2A experiment results

et al. 2007

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Recent experiment results from the HL-2A tokamak are presented in this paper. Supersonic molecular beam injection (SMBI) with liquid nitrogen temperature propellant is used. Low temperature SMBI can form hydrogen clusters that penetrate into the plasma more deeply and efficiently. Particle diffusion coefficient and convection velocity (D = 0.5–1.5 m2 s−1 and Vconv < 40 m s−1, respectively) are obtained at the plasma periphery using modulated SMBI. Multi-probe measurements reveal the m = 0–1, n = 0 symmetries of directly measured low frequency (7–9 kHz) electric potential and field are simultaneously observed for the first time. Impurity transport is determined with the laser blow-off system and transport code. A disruption predictor has been derived based on MHD activity observations and statistical analysis. Sawtooth characteristics during ECRH are investigated and coupling between m = 1 and m/n = 2/1 modes is studied. Detachment features of HL-2A divertor are numerically and experimentally studied using the code SOLPS5.0 and measured data. The long divertor legs and thin divertor throats in HL-2A pose MHD shaping problems resulting in momentum losses even at low densities and strongly enhanced main chamber losses.

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First Divertor Operation on the HL-2A Tokamak

Cited by 19 publications

References 4 publications

Development of a new gas puff imaging diagnostic on the HL-2A tokamak

Development of a new gas puff imaging diagnostic on the HL-2A tokamak

Design and development of the power supply system for HL-2A tokamak

Overview of HL-2A experiment results

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