Papers by Author: Yun Tao Song

Abstract: Within the large scale fusion experimental device ITER, Ion Cyclotron Resonance Heating (ICRH) system is one of the three heating systems which will supply total heating power of 20 MW (40-55 MHz) up to one hour operation. Radio-Frequency (RF) contacts are integrated within the antennas for assembly and operation considerations, which will face extremely harsh service conditions, including neutron irradiation, heavy electrical loads (RF current reaches up to 2 kA with a linear current density of 4.8 kA/m), high thermal loads and also long-duration vacuum baking at 250°C before each experimental plasma campaign. CuCrZr and 316L steel have been shown to be proper base candidate materials for ITER RF contact louvers and conductors respectively. However, in order to limit the wear and the diffusion phenomena at the RF contact as well as to reduce the contact resistance, functional protective layers should be developed. The aim of this work is to investigate Au-Ni and Rh functional layers, electroplated on CuCrZr and 316L respectively. The efficiency of the Au-Ni/Rh coated pairs was evaluated through thermal ageing diffusion tests, using EDS cross-section mapping and XRD techniques. Wear and electrical contact performances of the Au-Ni/Rh original and thermally aged pairs have also been deeply studied on a dedicated tribometer operated at ITER relevant conditions.

Abstract: In order to facilitate the exchange and cooperation for the fusion research, we proposed the high-speed special network environment to achieve the design, research of the program and manage the project contracts, schedule, video conference system and data sharing. The article states the network acceleration mechanisms based-on the HS-TCP protocol and proposes a kind of data encryption based-on AES and SSL and describes the framework of the special network. Then we have verified the feasibility and security of the project by the experiment.

Abstract: Nuclear fusion is one of the most important ways to resolve human energy issues. The main structure of nuclear fusion device and its functions are introduced in this article. Virtual simulation technology has been used in the process of the conceptual design, detailed design and optimization of the fusion device structure. Electromagnetic analysis of the ITER feeder system show the specific application of virtual simulation technology in nuclear fusion engineering, as well as the thermal analysis of ITER thermal shield. It verifies the importance of virtual simulation technology.

Abstract: International thermonuclear experimental reactor (ITER) soft x-ray (SXR) diagnostic camera is an indispensible component used to measure signal intensity of SXR, which can reflect the internal properties of plasma. In this paper, the preliminary structural design and working principle of SXR camera is demonstrated, to investigate its seismic performance, modal analysis has been performed to obtain natural frequencies, effective mass and mode of vibration in first ten modes by means of ANSYS software. Then according to two parallel seismic analysis methods used in ITER, the calculations have been performed and the corresponding results have been illustrated respectively, the stress intensity and displacement are all within the allowable margin, which indicates that the design is reasonable and feasible. It will also provide beneficial reference for subsequent work.