scholarly journals Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Instruments ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 27
Author(s):  
Maxim Marchevsky
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Hot Spot ◽  
High Temperature Superconductors ◽  
Zone Formation ◽  
Normal Zone ◽  
Normal Zone Propagation ◽  
Accelerator Magnets ◽  
Detection Schemes ◽  
Temperature Margin

High-temperature superconductors (HTS) are being increasingly used for magnet applications. One of the known challenges of practical conductors made with high-temperature superconductor materials is a slow normal zone propagation velocity resulting from a large superconducting temperature margin in combination with a higher heat capacity compared to conventional low-temperature superconductors (LTS). As a result, traditional voltage-based quench detection schemes may be ineffective for detecting normal zone formation in superconducting accelerator magnet windings. A developing hot spot may reach high temperatures and destroy the conductor before a practically measurable resistive voltage is detected. The present paper discusses various approaches to mitigating this problem, specifically focusing on recently developed non-voltage techniques for quench detection.

scholarly journals Measurements and Analysis of AC Losses in HTS Windings of Electrical Machine for Different Operation Modes

2021 ◽  
Vol 11 (6) ◽  
pp. 2741
Author(s):  
Sergey Zanegin ◽  
Nikolay Ivanov ◽  
Vasily Zubko ◽  
Konstantin Kovalev ◽  
Ivan Shishov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Transport Current ◽  
Operating Conditions ◽  
Ac Losses ◽  
Electrical Machine ◽  
2Nd Generation ◽  
Motor Mode

The article is devoted to the study of losses in devices based on high-temperature superconductors of the 2nd generation. The complexity of the devices under study increases from a single rack coil to a winding assembled from several coils, and finally to an electric machine operating in generator mode. This is the way to experimentally study the behavior of 2nd generation high temperature superconductor (2G HTS) carrying a transport current in various conditions: self-field, external DC, and AC magnetic field. Attention is also paid to the losses in the winding during its operation from the inverter, which simulates the operating conditions in the motor mode of a propulsion system.

A Fast 10-kA Current Switch for High-Temperature Superconductor Accelerator Magnets

2018 ◽  
Vol 28 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Marco Statera ◽  
Francesco Broggi ◽  
Mauro Citterio ◽  
Stefano Latorre ◽  
Carlo Gesmundo ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Current Switch ◽  
Accelerator Magnets

scholarly journals R & D for accelerator magnets with react and wind high temperature superconductors

2002 ◽  
Vol 12 (1) ◽  
pp. 75-80 ◽  
Author(s):  
R. Gupta ◽  
M. Anerella ◽  
J. Cozzolino ◽  
J. Escallier ◽  
G. Ganetis ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Accelerator Magnets

scholarly journals Microstructure of High Temperature Superconductors of the Perovskite Type

1987 ◽  
Vol 40 (4) ◽  
pp. 547 ◽  
Author(s):  
AF Moodie ◽  
HJ Whitfield
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
High Resolution Electron Microscopy ◽  
Convergent Beam Electron Diffraction ◽  
Beam Electron ◽  
Resolution Electron ◽  
Convergent Beam ◽  
Perovskite Type

Combined high resolution electron microscopy and convergent beam electron diffraction (CBED) of the same areas of crystals of Ba3La3Cu6014 reveals defects of various types including ordinary dislocations and polytypic intergrowths. This latter type is considered to be intimately associated with the performance of this material as a high temperature superconductor ..

scholarly journals Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

Instruments ◽  
2019 ◽  
Vol 3 (4) ◽  
pp. 62 ◽  
Author(s):  
Xiaorong Wang ◽  
Stephen A. Gourlay ◽  
Soren O. Prestemon
Keyword(s):  
High Temperature ◽  
Technology Development ◽  
High Temperature Superconductors ◽  
National Laboratory ◽  
Dipole Field ◽  
Research Needs ◽  
Magnet Technology ◽  
Future Technology ◽  
The Status ◽  
Accelerator Magnets

To enable the physics research that continues to deepen our understanding of the Universe, future circular colliders will require a critical and unique instrument—magnets that can generate a dipole field of 20 T and above. However, today’s maturing magnet technology for low-temperature superconductors (Nb-Ti and Nb 3 Sn) can lead to a maximum dipole field of around 16 T. High-temperature superconductors such as REBCO can, in principle, generate higher dipole fields but significant challenges exist for both conductor and magnet technology. To address these challenges, several critical research needs, including direct needs on instrumentation and measurements, are identified to push for the maximum dipole fields a REBCO accelerator magnet can generate. We discuss the research needs by reviewing the current results and outlining the perspectives for future technology development, followed by a brief update on the status of the technology development at Lawrence Berkeley National Laboratory. We present a roadmap for the next decade to develop 20 T-class REBCO accelerator magnets as an enabling instrument for future energy-frontier accelerator complex.

Overview of High Temperature Superconductor Machines

2021 ◽  
Vol 4 (4) ◽  
pp. 25-33
Author(s):  
Bruno Douine ◽  
◽  
Hocine Menana ◽  
Kevin Berger ◽  
Jean Lеvеque ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Systems ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Synchronous Machine ◽  
Recent Time ◽  
Operating Principle ◽  
Electrical Machines ◽  
Synchronous Machines ◽  
Ac Losses

Electrical machines are important parts of different power systems. The application of high temperature superconductors (HTS) in electrical machines is very promising due to high transport currents. This paper reviews various topologies of superconducting motors and generators using HTS published in the literature in recent time. It begins with a brief presentation of the HTS material used in electrical machines. The description of AC losses and cryogenic systems is done afterwards. Then we offer a striking description of the various realizations of HTS electrical machines such as half HTS synchronous machines, fully HTS synchronous machine, machines with HTS bulks and stacks. Some of these machines are totally innovative compared to conventional ones and their operating principle is strictly related to the presence of HTS materials.

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