A 16-channel heterodyne electron cyclotron emission radiometer on J-TEXT

Zhang, Yang; Phillips, P. E.; Zhuang, G.; Xiao, Jinshui; Huang, He; Rowan, W. L.; Wang, Z. J.

doi:10.1063/1.4732069

Cited by 31 publications

(24 citation statements)

References 9 publications

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“…Case C. In the experiments with applied DRMP [35], the electron cyclotron emission (ECE) radiometer was available for measuring the electron temperature T e [42]. Since the ECE signals have not been calibrated, they only give the relative change in T e .…”

Section: Resultsmentioning

confidence: 99%

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

Hu¹,

Zhuang²,

Yu³

et al. 2014

Nucl. Fusion

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The effect of resonant magnetic perturbations (RMPs) on particle transport has been studied in J-TEXT tokamak. It is found that for the discharges with an existing saturated 2/1 resistive tearing mode, applied RMPs of moderate amplitude lead to a decrease in electron density with a relative amplitude 3% < |ne/ne0| < 10% in plasma core, and the mode stabilization and electron temperature increase are observed simultaneously in this case. Sufficiently large amplitude of RMPs, however, lead to locked modes and much larger decrease in the electron density as well as in the electron temperature, with |ne/ne0| ~ 20%. For the discharges without 2/1 tearing modes, applied RMPs cause a relative density decrease |ne/ne0| ~ 10% (30%) before (after) field penetration. Using the two-fluid equations and experimental parameters as input, the numerical results approximately agree with experimental observations.

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Section: Resultsmentioning

confidence: 99%

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

Hu¹,

Zhuang²,

Yu³

et al. 2014

Nucl. Fusion

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“…The q = 2 rational surface is at about r ~ 19 cm (i.e. r/a = 0.74), which is estimated by the reverse radius of electron temperature perturbation measured by electron cyclotron emission (ECE) [36].…”

Section: Methodsmentioning

confidence: 99%

Effect of electrode biasing on m/n = 2/1 tearing modes in J-TEXT experiments

Liu

Chen

et al. 2016

Nucl. Fusion

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The effects of electrode biasing (EB) on the m/n = 2/1 tearing mode have been experimentally studied in J-TEXT tokamak discharges, where m and n are the poloidal and toroidal mode numbers. It is found that for a negative bias voltage, the mode amplitude is reduced, and the mode frequency is increased accompanied by the increased toroidal plasma rotation speed in the counter-I p direction. For a positive bias voltage, the mode frequency is decreased together with the change of the rotation velocity towards the co-I p direction, and the mode amplitude is increased. Statistic results show that the variations in the toroidal rotation speed, the 2/1 mode frequency and its amplitude linearly depend on the bias voltage. The threshold voltages for complete suppression and locking of the mode are found. The experimental results suggest that applied electrode biasing is a possible method for the avoidance of mode locking and disruption.

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“…One of the 8 ways is divided by a 2-way broadband power divider again and one of them is input to the CECE for fluctuation measurement, and the others for temperature profile. 9 A block diagram of microwave circuit of the CECE diagnostic is shown in Fig. 1.…”

Section: Cece On J-textmentioning

confidence: 99%

The design of a correlation electron cyclotron emission system on J-TEXT

Yang

Xiao

et al. 2015

Review of Scientific Instruments

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To study the anomalous transport, a correlation electron cyclotron emission (CECE) was planned to be developed on J-TEXT for electron temperature fluctuation measurement. The spectral decorrelation method was employed for the CECE system. It was developed based on the previous 16-channel electron cyclotron emission system. They shared the optical transmission line and mixer. The CECE part consists of 4 channels. Two fixed frequency narrow band filters were used for two channels and two yttrium iron garnet (YIG) filters for the other two channels. To meet the measuring requirement, some tests have been taken for the YIG filters. The results show good performance of the filters. Gaussian optics is used to produce a good poloidal resolution. Wavenumbers resolved by the CECE diagnostic are k(θ) ≤ 1.5 rad/cm and k(r) ≤ 12 rad/cm. Some preliminary experiment results are also presented in this paper.

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A 16-channel heterodyne electron cyclotron emission radiometer on J-TEXT

Cited by 31 publications

References 9 publications

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

Effect of electrode biasing on m/n = 2/1 tearing modes in J-TEXT experiments

The design of a correlation electron cyclotron emission system on J-TEXT

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