scholarly journals Development of a Cryogen-Free Compact 3 T Superconducting Magnet for an Electromagnetic Property Measurement System

2021 ◽  
Vol 11 (7) ◽  
pp. 3074
Author(s):  
Jae Young Jang ◽  
Myung Su Kim ◽  
Young Jin Hwang ◽  
Seunghyun Song ◽  
Yojong Choi ◽  
...  
Keyword(s):  
High Temperature ◽  
Measurement System ◽  
Electromagnetic Property ◽  
Superconducting Magnet ◽  
Optimized Design ◽  
Magnet System ◽  
Superconducting Tape ◽  
High Temperature Superconducting ◽  
Target Field ◽  
Property Measurement

A cryogen-free portable 3 T high-temperature superconducting magnet for an electromagnetic property measurement system has been developed to serve as a user facility at the Korea Basic Science Institute. The metallic insulation method was adopted to reduce the charging delay without sacrificing the self-protecting feature. A genetic-algorithm-aided optimized design was carried out to minimize the superconducting tape consumption while satisfying several design constraints. After the design, the compact high-temperature superconducting magnet composed of eight double-pancake coil modules was wound with high-temperature superconducting tape and stainless steel tape, and integrated with a two-stage cryo-cooler. The 3 T magnet was successfully cooled to approximately 20 K with a cryo-cooler and reached the target field of 3 T without any problems. Long-term measurements and a range of other tests were also implemented to verity the performance of the magnet. Test results demonstrated the feasibility of a cryogen-free portable high-temperature superconducting magnet system for electromagnetic property measurement experiments.

Design analysis of a solid nitrogen cooled “permanent” high-temperature superconducting magnet system

Cryogenics ◽  
2002 ◽  
Vol 42 (10) ◽  
pp. 617-634 ◽  
Author(s):  
Benjamin J Haid ◽  
Haigun Lee ◽  
Yukikazu Iwasa ◽  
Sang-Soo Oh ◽  
Young-Kil Kwon ◽  
...  
Keyword(s):  
High Temperature ◽  
Superconducting Magnet ◽  
Design Analysis ◽  
Magnet System ◽  
High Temperature Superconducting ◽  
Solid Nitrogen ◽  
Superconducting Magnet System

scholarly journals Study on the Applicability of Neutron Radiation Damage Method Used for High-Temperature Superconducting Tape Based on Geant4 and SRIM

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ying Zheng ◽  
Jinxing Zheng ◽  
Xudong Wang
Keyword(s):  
High Temperature ◽  
Radiation Damage ◽  
Cross Sections ◽  
Neutron Radiation ◽  
Superconducting Magnet ◽  
High Energy ◽  
Incident Neutron ◽  
Superconducting Layer ◽  
Superconducting Tape ◽  
High Temperature Superconducting

High-temperature superconducting material is a promising candidate to fabricate superconducting magnet for magnetic confinement fusion reactors. The DPA number of the 1 µm thick superconducting layer in a high temperature superconducting tape under neutron irradiation needs to be calculated to predict the property changes. The DPA cross sections, which ignore the spatial distribution of vacancies caused by PKAs, are commonly used to obtain the results of the damage energy and DPA. However, for geometric models with the thickness as small as 1 µm, the energy and angular distribution of PKAs reveal that a significant number of PKAs with relatively high energy tend to scatter forward and cross the boundary of model, so the thickness of model has the potential to affect the number of displaced atoms. In this paper, we developed a method based on Geant4 and SRIM to evaluate the deviation of the traditional analytic method caused by the thickness. Geant4 is used to obtain the location, direction, and energy of PKAs, while SRIM is used to track every PKA and obtain damage energy and the number of displaced atoms. The radiation damage calculation of simple thin plate models with different thicknesses and the tape model are conducted with the neutron energies from 1 to 14 MeV. The results show that PKAs need to be tracked continuously for models with thickness less than 10 µm and the deviation of the analytic formulas increases rapidly with the decrease of thickness. For the superconducting layer composed of four different elements in the tape, the deviation also depends on the proportion of each atomic species and the neutron-atom interaction cross sections under different incident neutron energy.

scholarly journals Performance Evaluation of Current Leads for a 5 Tesla Electromagnetic Properties Measurement System

2020 ◽  
Vol 10 (19) ◽  
pp. 6712
Author(s):  
Myung Su Kim ◽  
Jae Young Jang ◽  
Young Jin Hwang ◽  
Yeon Suk Choi
Keyword(s):  
Low Temperature ◽  
Liquid Helium ◽  
Measurement System ◽  
Electromagnetic Property ◽  
Electrical Current ◽  
Superconducting Magnet ◽  
Electromagnetic Properties ◽  
Current Leads ◽  
Property Measurement ◽  
Heat Inflow

The development of the Electromagnetic Property Measurement System is underway at the Korea Basic Science Institute. The Electromagnetic Property Measurement System is used for electrical, thermal, and magnetic specimen property measurements in variable magnetic fields and temperatures with a low-temperature superconducting magnet. To activate low-temperature superconducting magnet that operates with liquid helium, we propose the use of vapor-cooled current leads. The low-temperature superconducting magnet is connected to the power supply at room temperature through a pair of current leads. Accordingly, heat inflows through the current leads and represents one of the major contributory factors of the entire heat inflow. Therefore, design optimization and evaluation of the current leads is necessary to minimize heat and liquid helium consumption. Vapor-cooled, and hybrid current leads were designed and fabricated, and testing in liquid helium cryostat was conducted. The low-temperature superconducting magnet was charged with electrical current up to the operating level, and the liquid helium boil-off rate was measured with respect to the supplied electrical current level. The performances of the two current leads were accessed based on the thermal load and boil-off rate of the liquid helium. The experimental and analyzed liquid helium boil-off rates associated with the current leads were in close agreement.

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