High-speed bit-error-rate measurement system for high-temperature superconducting digital circuits

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.

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Analysis of the Permanent Magnet Guideway of High Temperature Superconducting Maglev

Materials Science Forum ◽

10.4028/www.scientific.net/msf.745-746.197 ◽

2013 ◽

Vol 745-746 ◽

pp. 197-202 ◽

Cited By ~ 2

Author(s):

Chang Qing Ye ◽

Zi Gang Deng ◽

Jia Su Wang

Keyword(s):

High Temperature ◽

Permanent Magnet ◽

High Speed ◽

Optimization Design ◽

Optimization Methods ◽

High Temperature Superconducting ◽

Practical Engineering ◽

Hts Maglev ◽

Ndfeb Permanent Magnet ◽

The Cost

t was theoretically and experimentally proved that High Temperature Superconducting (HTS) Maglev had huge potential employment in rail transportation and high speed launch system. This had attracted great research interests in practical engineering. The optimization design was one of the most important works in the application of the HTS Maglev. As the NdFeB permanent magnet and HTS materials prices increased constantly, the design optimization of the permanent guideway (PMG) of HTS maglev became one of the indispensable works to decrease the cost of the application. This paper first reviewed four types of PMGs used by the HTS Maglev, then disucssed their structures and magnetic fields. Finally, the optimization methods of these four PMGs were compared. It was suggested that with better optimization methods, the levitation performance within a limit cost got better. That would be helpful to the future numerical optimization of the PMG of the HTS maglev.

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Bit error rate performance of high-speed tunnel communication

1997 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference. 'Linking to the Next Century'. Proceedings ◽

10.1109/sbmomo.1997.646847 ◽

2002 ◽

Author(s):

Chien-Ching Chiu ◽

Chi-Ping Wang

Keyword(s):

Bit Error Rate ◽

Error Rate ◽

High Speed ◽

Rate Performance

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High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Electronics ◽

10.3390/electronics10161980 ◽

2021 ◽

Vol 10 (16) ◽

pp. 1980

Author(s):

Li Lu ◽

Wei Wu ◽

Xin Yu ◽

Zhijian Jin

Keyword(s):

High Temperature ◽

Liquid Helium ◽

High Speed ◽

Closed Loop ◽

Permanent Magnets ◽

Superconducting Magnets ◽

Current Mode ◽

Persistent Current ◽

Magnetomotive Force ◽

High Temperature Superconducting

The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.

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