Thermal performance of TF coils in HT-7U under plasma disruption |
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| Affiliation: | 1. IIT Bombay-Monash Academy, Indian Institute of Technology Bombay, Mumbai, 400076, India;2. Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India;3. Department of Civil Engineering, Monash University, Victoria, 3800, Australia;1. State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shanxi 710072, China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese of Academy of Sciences, Lanzhou, Gansu 730000, China;3. Laboratory for Advanced Interfacial Materials and Devices, Research Centre for Smart Wearable Technology, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;1. Unit of Biology and Genetics of Movement, Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Italy;2. Physical Exercise and Sport Sciences Unit, Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, Rome, Italy;3. Sport Performance Laboratory, Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Italy;4. Endocrinology Unit, Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Italy;1. Qianweichang College, Shanghai University, Shanghai 200444, China;2. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621000, China;3. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;4. Materials Genome Institute, Shanghai University, Shanghai 200444, China |
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| Abstract: | One of the most severe events for HT-7U TF coils is the plasma disruption event. Within a short period of the plasma disruption, the case and the coils will be heated up by the eddy current and coupling loss induced by the magnetic field variation. Certain amount of the deposited heat in coil cases would be conducted to the coil bundles. In this paper, the center plasma disruption is modeled and electromagnetic field is calculated by ANSYS software. The generated heat is thus directly coupled to the transient thermal analysis with the same software. It was found when the plasma current in normal condition is 1.5 MA and the disruption time constant is 3 ms, the eddy current will heat the case up to a temperature increase of about 15 K in the middle of the inner straight leg. The heat transferred from case to the cable can warm up the helium in the CIC bundle to a temperature increase of about 0.4 K 10 s after plasma disruption. The coupling loss in the coils is evaluated based on the magnetic field variation and the coupling time constant of the CICC cable. By applying GANDALF for the stability calculation, it is shown the coupling loss due to plasma disruption can reduce the temperature margin of coil by 0.63 K. |
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