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133 results on '"Yan, L. W."'

1. Overview of the Recent Study on ELM Mitigation Physics with Different External Actuators on HL-2A Tokamak

Author

Xiao, G. L., Zhong, W. L., Zhang, Y. P., Zou, X. L., Liang, A. S., Feng, B. B., Bai, X. Y., Zhang, K., Mazon, D., Chen, C. Y., Chen, W., Cheng, J., Delpech, L., Ding, X. T., Dong, C. F., Dong, J. Q., Cui, Z. Y., Ekedahl, A., Gao, J. M., Giruzzi, G., Goniche, M., Han, M. K., He, X. X., Hoang, T., Huang, Z. H., Isobe, M., Ji, X. Q., Li, Y. G., Liu, A. D., Liu, C. H., Liu, L., Lu, B., Peysson, Y., Shi, P. W., Song, X. M., Sun, P., Wang, T. B., Wang, Z. H., Wang, Z. X., Wen, J., Xiao, W. W., Yan, L. W., Yang, Z. C., Yu, D. L., Yuan, G. L., Zhang, P. F., Zhou, Y., Shi, Z. B., Liu, Y., Yang, Q. W., Xu, M., and Duan, X. R.

Published
2020
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2. EGAM Induced by Energetic-electrons and Nonlinear Interactions among EGAM, BAEs and Tearing Modes in a Toroidal Plasma

Author

Chen, W., Ding, X. T., Yu, L. M., Ji, X. Q., Dong, J. Q., Yang, Q. W., Liu, Yi., Yan, L. W., Zhou, Y., Li, W., Song, X. M., Chen, S. Y., Cheng, J., Shi, Z. B., Duan, X. R., and team, HL-2A

Subjects
Physics - Plasma Physics
Abstract

In this letter, it is reported that the first experimental results are associated with the GAM induced by energetic electrons (eEGAM) in HL-2A Ohmic plasma. The energetic-electrons are generated by parallel electric fields during magnetic reconnection associated with tearing mode (TM). The eEGAM localizes in the core plasma, i.e. in the vicinity of q=2 surface, and is very different from one excited by the drift-wave turbulence in the edge plasma. The analysis indicated that the eEGAM is provided with the magnetic components, whose intensities depend on the poloidal angles, and its mode numbers are jm/nj=2/0. Further, there exist intense nonlinear interactions among eEGAM, BAEs and strong tearing modes (TMs). These new findings shed light on the underlying physics mechanism for the excitation of the low frequency (LF) Alfv\'enic and acoustic uctuations., Comment: 5 pages,4 figures

Published
2012
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4. Effect of the E × B drift on the redistribution of the divertor particle flux in the HL-2A ECRH plasmas

Author

Wu, N., primary, Cheng, J., additional, Du, H. L., additional, Huang, Z. H., additional, Yan, L. W., additional, Wang, W. C., additional, Yi, K. Y., additional, Miao, X. Q., additional, Gao, J. M., additional, Xu, J. Q., additional, Shi, Z. B., additional, Liu, Y., additional, Yang, Q. W., additional, Dong, J. Q., additional, Zhong, W. L., additional, and Xu, M., additional

Published
2023
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5. Divertor detachment of high βNH-mode discharges with the HL-2A closed divertor geometry

Author

Gao, J M, primary, Cai, L Z, additional, Cao, C Z, additional, Ma, H C, additional, Ke, R, additional, Zhong, W L, additional, Wu, N, additional, Hu, Y, additional, Gao, X Y, additional, Cui, C H, additional, Huang, Z H, additional, Nie, L, additional, Liu, L, additional, Yang, Z C, additional, Yu, X, additional, Li, Y G, additional, Jiang, M, additional, Xue, G Q, additional, Shi, Z B, additional, Yan, L W, additional, Ji, X Q, additional, Liu, X L, additional, Wei, H L, additional, Wang, Y Q, additional, and Xu, M, additional

Published
2022
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6. The ITB dynamics controlled by internal kink modes on HL-2A tokamak

Author

He, X X, primary, Yan, L W, additional, Yu, D L, additional, Chen, W, additional, Yu, L M, additional, Ma, Q, additional, Liu, L, additional, Wei, Y L, additional, He, X F, additional, Zhang, N, additional, Li, Y G, additional, Sun, T F, additional, Nie, L, additional, Shi, Z B, additional, Zhong, W L, additional, Xu, M, additional, and Duan, X R, additional

Published
2021
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7. Effects of a coherent mode on the redistribution of divertor particle flux in HL-2A H-mode plasmas

Author

Wu, N, primary, Cheng, J, additional, Yan, L W, additional, Huang, Z H, additional, Xu, J Q, additional, Wang, W C, additional, Ke, R, additional, Yang, Z C, additional, Ji, X Q, additional, Liu, L, additional, He, X X, additional, Jiang, M, additional, Wen, J, additional, Miao, X G, additional, Zhong, W L, additional, Yu, L M, additional, Gao, J M, additional, Dong, Y B, additional, Shi, Z B, additional, Liu, Y, additional, Yang, Q W, additional, Dong, J Q, additional, and Xu, M, additional

Published
2021
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9. Z effMeasurement in Ohmic, L- and H-Mode Plasmas on HL-2A Tokamak

Author

Liu, L., primary, Yu, D. L., additional, Chen, W. J., additional, Zhang, K., additional, Li, D., additional, He, X. F., additional, He, X. X., additional, Wei, Y. L., additional, Zhang, N., additional, Yang, Z. C., additional, Yan, L. W., additional, Shi, Z. B., additional, Liu, Yi, additional, and Yang, Q. W., additional

Published
2020
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11. The ITB dynamics controlled by internal kink modes on HL-2A tokamak.

Author

He, X X, Yan, L W, Yu, D L, Chen, W, Yu, L M, Ma, Q, Liu, L, Wei, Y L, He, X F, Zhang, N, Li, Y G, Sun, T F, Nie, L, Shi, Z B, Zhong, W L, Xu, M, and Duan, X R

Subjects
*TOKAMAKS, *FUSION reactors, *PLASMA beam injection heating, *INTERNAL auditing, *NEUTRAL beams, *ION temperature, *PLASMA currents
Abstract

The active control of internal transport barriers (ITBs) is an important issue to achieve high performance plasma in a fusion reactor. A critical challenge of ITB control is to increase the ITB position. The ITBs with internal kink modes (IKMs), such as fishbone (FB) instability and long-live mode (LLM) with mode number of m / n = 1/1 are frequently observed on HL-2A tokamak in neutral beam heated discharges. The correlation of FB instability/LLM with ITBs is analyzed in order to extend the ITB radius. It has been revealed that FB instability and LLM are often excited after the ITB formation. Therefore, FB instability and LLM play no role in triggering ITBs on HL-2A tokamak. On the other hand, they may slow down the outward radial expansion and then shrink the foot position of ITB, and damp the gradient growth of ion temperature and rotation velocity. Since the perturbation of LLM is weaker than that of FB instability, the shrinking effect of ITB foot and braking effect on gradient growth are slighter than those of FB instability. Compared with the LLM, FB instability routinely appears in plasmas with lower density, higher heating power and lower plasma current. In addition, large ITBs without IKMs are also discussed on HL-2A tokamak. The large ITB is the largest one, the FB ITB is the strongest one and the LLM ITB is the widest one in three ITBs, where the ‘large’, ‘strong’ and ‘wide’ qualifications correspond to ITB position ρ ITB, the normalized temperature gradient R /LT, and its width W / a. Therefore, the large ITB position may be obtained if the IKMs are effectively controlled in a tokamak. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Observation of inward transport flux accompanied with the long-lived mode during the L-H transition in the HL-2A tokamak

Author

Wu, J., primary, Lan, T., additional, Zhuang, G., additional, Xu, M., additional, Yu, C. X., additional, Wu, J. R., additional, Nie, L., additional, Chen, W., additional, Yu, L. M., additional, Cheng, J., additional, Yan, L. W., additional, Duan, X. R., additional, Deng, T. J., additional, Xu, H. Q., additional, Zhang, S., additional, Zhu, J. F., additional, Yu, Y., additional, Sun, X., additional, Mao, W. Z., additional, Liu, A. D., additional, Xie, J. L., additional, Li, H., additional, Ding, W. X., additional, and Liu, W. D., additional

Published
2020
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13. Zeff Measurement in Ohmic, L- and H-Mode Plasmas on HL-2A Tokamak.

Author

Liu, L., Yu, D. L., Chen, W. J., Zhang, K., Li, D., He, X. F., He, X. X., Wei, Y. L., Zhang, N., Yang, Z. C., Yan, L. W., Shi, Z. B., Liu, Yi, and Yang, Q. W.

Subjects
FUSION reactors, PLASMA-wall interactions, PLASMA boundary layers, SILANIZATION, PREDICTION theory, TOKAMAKS
Abstract

$Z_{\mathrm {eff}}$ is measured by two visible bremsstrahlung diagnostics on HL-2A tokamak, one of which uses a high spectral resolution spectrometer coupled with an electron multiplied CCD (temporal resolution of 100 Hz), and the other uses a filterscope system (temporal resolution of 1 MHz). The bremsstrahlung brightness measured by them coincides with each other very well. $\bar {Z}_{\mathbf {eff}}$ is systematically measured under different discharge conditions, such as divertor and limiter configurations, ohmic and auxiliary heating phases, before and after siliconization, and $L$ – $H$ transition. Under ohmic phase, $\bar {Z}_{\mathbf {eff}}$ is higher in the limiter configuration than that in the divertor configuration by a factor of ~1.5 under high-density regime. $\bar {Z}_{\mathbf {eff}}$ increases in all cases of auxiliary heating scenarios due to enhanced plasma–wall interaction, accompanied by influx increases of low ionization states of impurities such as C2+ and Fe1+ in plasma edge. Siliconization for wall conditioning is prominently effective in lowering the main impurity influxes in plasma edge and thus the impurity level, and a concentration of ~4% for carbon and ~0.2% for iron is roughly evaluated for a typical nonsiliconized plasma. A simple relationship that $Z_{\mathrm {eff}}$ is positively correlated with $\Phi _{\mathrm {in}}$ and $\tau _{\mathrm {p}}$ is verified from the L- and $H$ -mode features, where $\Phi _{\mathrm {in}}$ is the impurity influx and $\tau _{\mathrm {p}}$ the particle confinement time. A nearly constant $\bar {Z}_{\mathbf {eff}}$ evolution is observed during $L$ – $H$ and $H$ – $L$ transition and it seems that $\bar {Z}_{\mathbf {eff}}$ is insensitive to $L$ – $H$ and $H$ – $L$ transition under some $Z_{\mathrm {eff}}$ (0) threshold. The $Z_{\mathrm {eff}}$ profiles are flat/weakly hollow in plasma core region (rho < 0.7) in case of low $Z_{\mathrm {eff}}$ (0) and tend to be peaked when $Z_{\mathrm {eff}}$ (0) is larger than 3, which agrees with the neoclassical theory prediction. [ABSTRACT FROM AUTHOR]

Published
2020
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16. The role of geodesic acoustic mode on reducing the turbulent transport in the edge plasma of tokamak

Author

Geng, K. N., primary, Kong, D. F., additional, Liu, A. D., additional, Lan, T., additional, Yu, C. X., additional, Zhao, H. L., additional, Yan, L. W., additional, Cheng, J., additional, Zhao, K. J., additional, Dong, J. Q., additional, Duan, X. R., additional, Chen, R., additional, Zhang, T., additional, Zhang, S. B., additional, Gao, X., additional, Li, J., additional, Xie, J. L., additional, Li, H., additional, and Liu, W. D., additional

Published
2018
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18. Toroidal Alfvén eigenmode driven by energetic electrons during high-power auxiliary heating on HL-2A

Author

Yu, L. M., primary, Chen, W., additional, Ding, X. T., additional, Ji, X. Q., additional, Shi, Z. B., additional, Yuan, B. S., additional, Ma, R. R., additional, Chen, S. Y., additional, Li, Y. G., additional, Li, J. X., additional, Song, S. D., additional, Yang, Z. C., additional, Shi, P. W., additional, Jiang, M., additional, Zhang, Y. P., additional, Huang, M., additional, Li, W., additional, Feng, B. B., additional, Zhou, Y., additional, Ma, Rui, additional, Song, X. M., additional, Yu, D. L., additional, Cao, J. Y., additional, Lu, B., additional, Dong, J. Q., additional, Liu, Yi., additional, Zhong, W. L., additional, Yan, L. W., additional, Yang, Q. W., additional, Xu, M., additional, Duan, X. R., additional, and Liu, Y., additional

Published
2018
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19. Roles of turbulence– and pressure-gradient–induced flows in triggering H-mode at marginal heating power on HL-2A tokamak

Author

Cheng, J., primary, Dong, J. Q., additional, Yan, L. W., additional, He, Z. X., additional, Xie, H. S., additional, Xiao, Y., additional, Zhao, K. J., additional, Huang, Z. H., additional, Xu, J. Q., additional, Liu, L., additional, Shi, Z. B., additional, Zhong, W. L., additional, Yu, D. L., additional, Ji, X. Q., additional, Huang, Y., additional, Song, X. M., additional, Yang, Q. W., additional, Ding, X. T., additional, Zou, X. L., additional, and Duan, X. R., additional

Published
2016
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20. Synchronization of Geodesic Acoustic Modes and Magnetic Fluctuations in Toroidal Plasmas

Author

Zhao, K. J., primary, Nagashima, Y., additional, Diamond, P. H., additional, Dong, J. Q., additional, Itoh, K., additional, Itoh, S.- I., additional, Yan, L. W., additional, Cheng, J., additional, Fujisawa, A., additional, Inagaki, S., additional, Kosuga, Y., additional, Sasaki, M., additional, Wang, Z. X., additional, Wei, L., additional, Huang, Z. H., additional, Yu, D. L., additional, Hong, W. Y., additional, Li, Q., additional, Ji, X. Q., additional, Song, X. M., additional, Huang, Y., additional, Liu, Yi., additional, Yang, Q. W., additional, Ding, X. T., additional, and Duan, X. R., additional

Published
2016
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21. Current Profile Reconstruction Using Motional Stark Effect Polarimeter Data on HL-2A Tokamak

Author

Chen, W. J., Yu, D. L., Yan, L. W., Yuan, B. S., He, X. X., Liu, L., Wei, Y. L., Zhang, N., He, X. F., Wu, H., Shi, Z. B., Liu, Y., and Yang, Q. W.

Abstract

AbstractIn order to reconstruct the plasma current density, the Current Profile Fitting (CPF) code has been successfully developed on the HL-2A tokamak. A seven-channel motional Stark effect (MSE) diagnostic based on dual photoelastic modulators is installed to measure the pitch angle of the magnetic field, which can be used as an internal magnetic field constraint for the CPF code. Recently, the MSE polarimeter was upgraded with a real-time wavelength matching system to improve the signal-to-noise ratio. The magnetic field angle (γpitch) with a temporal resolution of 10 ms can be provided. In the CPF code, the plasma current density is described as a polynomial, and the Least-Squares method is used to determine the coefficients of the polynomial. The Finite Difference method and the Strongly Implicit Procedure method are used to solve the Grad-Shafranov equation. The code operation is stable. With the improved-quality MSE data, the CPF calculation result of shot 30782 suggests that the safety factor q profile is monotonic. The minimum q value is less than 1 on-axis during sawtooth oscillations in shot 30782. And, the position of the q = 1 surface is consistent with the sawtooth inversion radius measured by electron cyclotron emission and soft X-ray diagnostics.

Published
2020
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22. Dynamics of low–intermediate–high-confinement transitions in the HL-2A tokamak

Author

Xu, Y, primary, Cheng, J, additional, Dong, J Q, additional, Dong, Y B, additional, Jiang, M, additional, Zhong, W L, additional, Yan, L W, additional, Shi, Z B, additional, Huang, Z H, additional, Li, Y G, additional, Nie, L, additional, Xu, M, additional, Zhao, K J, additional, Ji, X Q, additional, Yu, D L, additional, Liu, Y, additional, Cui, Z Y, additional, Chen, W, additional, Yang, Q W, additional, Ding, X T, additional, Duan, X R, additional, and Liu, Yong, additional

Published
2014
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25. Observation and theory of nonlinear mode couplings between shear Alfvén wave and magnetic island in tokamak plasmas

Author

Chen, W., primary, Qiu, Z., additional, Ding, X. T., additional, Xie, H. S., additional, Yu, L. M., additional, Ji, X. Q., additional, Li, J. X., additional, Li, Y. G., additional, Dong, J. Q., additional, Shi, Z. B., additional, Zhang, Y. P., additional, Cao, J. Y., additional, Song, X. M., additional, Song, S. D., additional, Xu, M., additional, Yang, Q. W., additional, Liu, Yi., additional, Yan, L. W., additional, and Duan, X. R., additional

Published
2014
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26. The motional Stark effect polarimeter in the HL-2A tokamak

Author

Yu, D. L., primary, Wei, Y. L., additional, Xia, F., additional, Cao, J. Y., additional, Chen, C. Y., additional, Liu, L., additional, Chen, W. J., additional, Ji, X. Q., additional, Liu, Y., additional, Yan, L. W., additional, Yang, Q. W., additional, and Duan, X. R., additional

Published
2014
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27. Development of the scintillator-based probe for fast-ion losses in the HL-2A tokamak

Author

Zhang, Y. P., primary, Liu, Yi, additional, Luo, X. B., additional, Isobe, M., additional, Yuan, G. L., additional, Liu, Y. Q., additional, Hua, Y., additional, Song, X. Y., additional, Yang, J. W., additional, Li, X., additional, Chen, W., additional, Li, Y., additional, Yan, L. W., additional, Song, X. M., additional, Yang, Q. W., additional, and Duan, X. R., additional

Published
2014
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28. Intermittent convective transport suppressed by supersonic molecular beam injection on the HL-2A tokamak

Author

Nie, L, primary, Cheng, J, additional, Huang, Y, additional, Yan, L W, additional, Yao, L H, additional, Feng, B B, additional, Dong, J Q, additional, Xu, M, additional, Zhao, K J, additional, Yu, D L, additional, Zhong, W L, additional, Gao, J M, additional, Yuan, C C, additional, Huang, Z H, additional, Kong, D F, additional, Feng, Z, additional, Liu, C H, additional, Yao, K, additional, Shang, J, additional, Yang, Q W, additional, Ding, X T, additional, and Duan, X R, additional

Published
2014
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29. Development of frequency modulated continuous wave reflectometer for electron density profile measurement on the HL-2A tokamak

Author

Zhong, W. L., primary, Shi, Z. B., additional, Huang, X. L., additional, Liu, Z. T., additional, Chen, W., additional, Jiang, M., additional, Li, J., additional, Cui, Z. Y., additional, Song, X. M., additional, Chen, L. Y., additional, Zou, X. L., additional, Ding, X. T., additional, Liu, Yi, additional, Yan, L. W., additional, Yang, Q. W., additional, and Duan, X. R., additional

Published
2014
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30. Dynamics of Low-Intermediate–High-Confinement Transitions in Toroidal Plasmas

Author

Cheng, J., primary, Dong, J. Q., additional, Itoh, K., additional, Yan, L. W., additional, Xu, M., additional, Zhao, K. J., additional, Hong, W. Y., additional, Huang, Z. H., additional, Ji, X. Q., additional, Zhong, W. L., additional, Yu, D. L., additional, Itoh, S.-I., additional, Nie, L., additional, Kong, D. F., additional, Lan, T., additional, Liu, A. D., additional, Zou, X. L., additional, Yang, Q. W., additional, Ding, X. T., additional, Duan, X. R., additional, and Liu, Yong, additional

Published
2013
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31. Frequency-Resolved Nonlinear Turbulent Energy Transfer into Zonal Flows in Strongly HeatedL-Mode Plasmas in the HL-2A Tokamak

Author

Xu, M., primary, Tynan, G. R., additional, Diamond, P. H., additional, Manz, P., additional, Holland, C., additional, Fedorczak, N., additional, Thakur, S. Chakraborty, additional, Yu, J. H., additional, Zhao, K. J., additional, Dong, J. Q., additional, Cheng, J., additional, Hong, W. Y., additional, Yan, L. W., additional, Yang, Q. W., additional, Song, X. M., additional, Huang, Y., additional, Cai, L. Z., additional, Zhong, W. L., additional, Shi, Z. B., additional, Ding, X. T., additional, Duan, X. R., additional, and Liu, Y., additional

Published
2012
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32. Operation of HL-2A Tokamak

Author

Duan, X. R., primary, Huang, Y., additional, Liu, D. Q., additional, Xuan, W. M., additional, Chen, L. Y., additional, Rao, J., additional, Song, X. M., additional, Cao, Z., additional, Li, B., additional, Cao, J. Y., additional, Lei, G. J., additional, Li, X. D., additional, Liu, Yi, additional, Yang, Q. W., additional, Yao, L. Y., additional, Ding, X. T., additional, Dong, J. Q., additional, Yan, L. W., additional, Pan, C. H., additional, and Liu, Yong, additional

Published
2012
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35. Turbulence and zonal flows in edge plasmas of the HL-2A tokamak

Author

Zhao, K J, primary, Dong, J Q, additional, Yan, L W, additional, Hong, W Y, additional, Fujisawa, A, additional, Yu, C X, additional, Li, Q, additional, Qian, J, additional, Cheng, J, additional, Lan, T, additional, Liu, A D, additional, Zhao, H L, additional, Kong, D F, additional, Huang, Y, additional, Liu, Yi, additional, Song, X M, additional, Yang, Q W, additional, Ding, X T, additional, Duan, X R, additional, and Liu, Yong, additional

Published
2010
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37. Observation of a Spontaneous Particle-Transport Barrier in the HL-2A Tokamak

Author

Xiao, W. W., primary, Zou, X. L., additional, Ding, X. T., additional, Yao, L. H., additional, Feng, B. B., additional, Song, X. M., additional, Song, S. D., additional, Zhou, Y., additional, Liu, Z. T., additional, Yuan, B. S., additional, Sun, H. J., additional, Ji, X. Q., additional, Gao, Y. D., additional, Li, Y. G., additional, Yan, L. W., additional, Yang, Q. W., additional, Liu, Yi, additional, Dong, J. Q., additional, Duan, X. R., additional, Liu, Yong, additional, and Pan, C. H., additional

Published
2010
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39. A method of particle transport study using supersonic molecular beam injection and microwave reflectometry on HL-2A tokamak

Author

Xiao, W. W., primary, Zou, X. L., additional, Ding, X. T., additional, Dong, J. Q., additional, Yao, L. H., additional, Song, S. D., additional, Liu, Z. T., additional, Gao, Y. D., additional, Feng, B. B., additional, Song, X. M., additional, Yang, Q. W., additional, Yan, L. W., additional, Liu, Yi, additional, Duan, X. R., additional, Pan, C. H., additional, and Liu, Yong, additional

Published
2010
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43. Characteristics of geodesic acoustic mode zonal flow and ambient turbulence at the edge of the HL-2A tokamak plasmas

Author

Zhao, K. J., primary, Dong, J. Q., additional, Yan, L. W., additional, Hong, W. Y., additional, Lan, T., additional, Liu, A. D., additional, Qian, J., additional, Cheng, J., additional, Yu, D. L., additional, Huang, Y., additional, He, H. D., additional, Liu, Yi., additional, Yang, Q. W., additional, Duan, X. R., additional, Song, X. M., additional, Ding, X. T., additional, and Liu, Y., additional

Published
2007
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44. New diagnostic systems on HL-2A

Author

Ding, X. T., primary, Zhou, Y., additional, Deng, Z. C., additional, Xiao, W. W., additional, Liu, Z. T., additional, Shi, Z. B., additional, Yan, L. W., additional, Hong, W. Y., additional, and Yang, Q. W., additional

Published
2006
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46. The physics of edge resonant magnetic perturbations in hot tokamak plasmas

Author

Evans, T. E., primary, Burrell, K. H., additional, Fenstermacher, M. E., additional, Moyer, R. A., additional, Osborne, T. H., additional, Schaffer, M. J., additional, West, W. P., additional, Yan, L. W., additional, Boedo, J. A., additional, Doyle, E. J., additional, Jackson, G. L., additional, Joseph, I., additional, Lasnier, C. J., additional, Leonard, A. W., additional, Rhodes, T. L., additional, Thomas, P. R., additional, Watkins, J. G., additional, and Zeng, L., additional

Published
2006
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47. Recent Experimental Results in the HL-2A Tokamak.

Author

Li, W., Yang, Q. W., Ding, X. T., Yan, L. W., Shi, Z. B., Dong, Y. B., Yao, L. H., Hong, W. Y., Xuan, W. M., Liu, D. Q., Chen, L. Y., Song, X. M., Zhang, J. H., Cao, Z., Cui, Z. Y., Pan, Y. D., Duan, X. R., Yi Liu, Feng, B. B., and Zhou, Y.

Subjects
TOKAMAKS, FUSION reactors, NUCLEAR reactors, ELECTRON temperature, ELECTRON distribution, FEEDBACK control systems
Abstract

As the first divertor tokamak in China, HL-2A device has been successfully operated and stably sustained in the single-null divertor configuration under good feedback control of plasma current and position. Up to now, the following operation parameters have been achieved: Ip = 400 kA, Bt = 2.6 T and discharge duration Td = 2980ms. An excellent repeatability of discharge has been achieved and about 90% Greenwald density limit has been reached. The HL-2A SN divertor configuration can be simulated by the SWEQU code and identified by CCD imaging system and CF code. The experimental results proved that the divertor configuration and siliconization could strongly decrease the plasma radiation and impurity emission and reduce the recycling effectively. Density limit disruption has been analyzed and some interesting phenomena, such as asymmetric cold pulse perturbation and snake-like perturbation, have been observed during Molecular Beam Injection. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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48. The effect of the regenerator and tube volume on the performance of high frequency miniature pulse tube refrigerators.

Author

Hou, Y. K., Ju, Y. L., Yan, L. W., Zhou, Y., and Liang, J. T.

Subjects
ELECTRONIC pulse techniques, PUMPING machinery, COMPRESSORS
Abstract

In this paper, the ratios of the volume of the pulse tube and the void volume of the regenerator to the compressor's swept volume are considered as the two most important parameters for a high frequency miniature PTR design. Firstly, knowing the compressor's swept volume, a 1-D numerical simulation is adapted to investigate the effect of the above two ratios on the performance of the miniature PTR. Under the condition of charge pressure of 2.1MPa, 2.5MPa and 2.9MPa, and the operating frequency of 50Hz, it is found that the optimum ratios of the volume of the pulse tube and the void volume of the regenerator to the compressor's swept volume are in the range of 0.8-1.0 and 1.1-1.3, respectively. To verify this conclusion, 25 PTRs using a 1.66cm³ compressor are composed of five different size of regenerators and pulse tubes, and all the PTRs are tested under different charge pressure with operating frequency of 50Hz. The experimental results indicate that the optimum ratios of the volume of the pulse tube and the void volume of the regenerator to the compressor's swept volume are in the range of 0.7-1.0 and 1.0-1.2, respectively. The experimental results agree with the simulated results qualitatively. [ABSTRACT FROM AUTHOR]

Published
2002

49. Experimental study on a high frequency miniature pulse tube refrigerator with inertance tube.

Author

Hou, Y. K., Ju, Y. L., Yan, L. W., Liang, J. T., and Zhou, Y.

Subjects
REFRIGERATION & refrigerating machinery, ELECTRONIC pulse techniques
Abstract

It is generally considered that the use of an inertance tube in a high frequency pulse tube refrigerator (PTR) improves the phase shift between the pressure and the mass flow rate. In order to investigate the effects of inertance tubes on the performance of a miniature PTR, experiments on the high frequency miniature PTR with inertance tube, orifice and bypass have been carried out. Inertance tubes with various inner diameters of 0.5mm, 1mm, 1.5mm, 2mm and different lengths from 1m to 7m were tested. Two fine needle valves were adapted as the orifice and the bypass. The experiments were performed under a charge pressure of 2.5MPa. The operating frequency is varied from 20Hz to 50Hz. Experimental results show that the inertance tube with inner diameter of 1.5mm and length of 2m is proper for the miniature PTR at high frequency. The benefit of using only an inertance tube is not apparent in miniature PTR. The lowest temperature achieved by the PTR with inertance tube is only 107.3K, which is higher than the lowest temperature of 101.6K achieved by the bypass PTR. The miniature PTR with both inertance tube and double inlet configuration has the lowest temperature of 89K. It is also found that the bypass configuration has the function of power recovery. [ABSTRACT FROM AUTHOR]

Published
2002

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