Taian Zhou

Advances in lower hybrid technology at 4.6 GHz towards long-pulse tokamak operation

L. Li, Yong Yang, Miaohui Li, Wendong Ma et autres

Abstract To extend the long-pulse operation at higher plasma current and plasma density on Experimental Advanced Superconducting Tokamak (EAST), a new lower hybrid current drive (LHCD) system operating at 4.6 GHz with 4 MW nominal power is being under development. This paper …

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Design and analysis of a PAM launcher at 4.6 GHz for a new LHCD system on EAST

Miaohui Li, L. Liu, Yongheng Yang, L.M. Zhao et autres

Abstract To improve the Current Drive (CD) capability in long-pulse (up to ∼1000 s) H-mode operation, it has been decided to develop a new Lower Hybrid Current Drive system at 4.6 GHz with an active cooling Passive Active Multijunction (PAM) launcher on …

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Research of aluminum nitride water load for the 4.6 GHz 500 kW LHCD system of the CFETR

Dingzhen Li, Liyuan Zhang, Lianmin Zhao, Fukun Liu et autres

To meet the increasing heating needs of the China Fusion Experimental Tokamak Reactor (CFETR), the output power in each Lower Hybrid Current Drive (LHCD) transmission line should be increased from 250kW to 500kW. Therefore, a new high-power water load must be developed …

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Conceptual design of the LHCD system on CFETR

Liang Liu, Yong Yang, Miaohui Li, L.M. Zhao et autres

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Development of lower hybrid wave power feedback control and experiments on EAST

Mao Wang, Wendong Ma, Yong Yang, Miaohui Li et autres

Abstract A new method of power feedback control for the lower hybrid wave (LHW) systems on the experimental advanced superconducting tokamak (EAST) is presented. Different methods are applied to control the power of two LHW systems with different frequency at 2.45 GHz …

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Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST

Mao Wang, L. Liu, L.M. Zhao, Miaohui Li et autres

Aiming at high-power and long-pulse operation up to 1000 s, some improvements have been made for both 2.45 GHz and 4.6 GHz lower hybrid (LH) systems during the recent 5 years. At first, the guard limiters of the LH antennas with graphite …

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Design and Test of 4.6 GHz 500 kW Continuous Wave 3 dB High Power Divider

Dingzhen Li, Lianmin Zhao, Fukun Liu, Min Cheng et autres

A 500-kW continuous-wave (CW) high-power 3-dB divider is designed for the 4.6-GHz lower hybrid current drive system in the Experimental and Advanced Superconducting Tokamak (EAST). A multistepped structure is used to increase the power capacity, and a water cooling structure is introduced …

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Power Modulation System and Experiments of Lower Hybrid Wave on EAST

Mao Wang, Zege Wu, Wendong Ma, Huaichuan Hu et autres

To satisfy various requirements of different physics experiments, a new power modulation method of the lower hybrid wave (LHW) has been developed in Experimental Advanced Superconducting Tokamak (EAST), including the development of a control source combining software and hardware. Such modulation system …

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Design of the klystron filament power supply control system for EAST LHCD

Zege Wu, Mao Wang, Huaichuan Hu, Wendong Ma et autres

A filament is a critical component of the klystron used to heat the cathode. There are totally 44 klystrons in experimental advanced superconducting tokamak (EAST) lower hybrid current drive (LHCD) systems. All klystron filaments are powered by AC power suppliers through isolated …

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EVALUATION AND OPTIMIZATION RESEARCH OF GROUND SOURCE HEAT PUMP

Taian Zhou

Nowadays energy efficiency and environmental protection have got particular attention. After the sustainable development theory had been put forward decades ago. Ground source heat pump with air conditioning system has pointed out a new way for saving energy as well as reducing …