Cryogenic testing of MEMS microphones towards their utilization as a quench detection method in superconducting magnets

2020 ◽  
Vol 148 (4) ◽  
pp. 2640-2640
Author(s):  
Robert D. White ◽  
Zijia Zhao ◽  
Casey Owen ◽  
Mischael Anilus ◽  
Steve Chau ◽  
...  
Keyword(s):  
Detection Method ◽  
Superconducting Magnets ◽  
Mems Microphones ◽  
Cryogenic Testing

A visual and full-field method for detecting quench and normal zone propagation in HTS tapes

2021 ◽  
Author(s):  
Shudan Wang ◽  
Mingzhi Guan ◽  
Jiaxiang Chen ◽  
Xingzhe Wang ◽  
You-He Zhou
Keyword(s):  
High Field ◽  
Detection Method ◽  
Superconducting Magnets ◽  
Extreme Environments ◽  
Field Method ◽  
Image Correlation ◽  
Detection Methods ◽  
Full Field ◽  
Normal Zone ◽  
Cryogenic Chamber

Abstract A fast and effective quench detection method is especially challenging in the development of high-field high-temperature superconducting (HTS) magnets for their safe operations and reliably releasing the stored energy during a quench. The occurrence and propagation of a quench are often accompanied by strong thermal and magneto-mechanical responses within superconducting magnets. Aiming to detect a quench in the whole process and capture the thermoelastic behavior associated with it, a new detection technique with a visual and full-field perception based on the digital image correlation (DIC) method is proposed in the present study. The experiment of a quench triggered thermally by a local spot heater is conducted for a YBCO coated conductor tape in a cryogenic chamber. The evolution and characteristics of the full-field strain in the HTS tape during the processes of a non-quench, a quench occurrence and quench propagation are intuitively presented with experimental observations. For the comparison purpose, the conventional quench detection methods by monitoring temperature and voltage signals during a quench are also utilized experimentally. The results verify the visual and full-field quench detection method which uses a criterion of thermoelastic strain-rate for the quench occurrence and the evolution of strain contours for the normal zone propagating aspect. Additionally, a numerical quench model of coupled thermoelasticity to simulate the experiment is established and solved with the aid of Comsol multiphysics software. The quantitative results are in good agreement with the experimental measurements to prove the reliability and availability of the developed detection method. Since the DIC method is non-contact and insensitivity to intense electromagnetic interferences, it is expected to provide a new technique on quench issues and some basic measurements on strain/stress behaviors in extreme environments of high-field HTS magnets in the future.

scholarly journals Cryogenic testing of fast ramping superconducting magnets for the SIS100 synchrotron

2020 ◽  
Vol 755 ◽  
pp. 012133 ◽  
Author(s):  
A Bleile ◽  
I Datskov ◽  
E Fischer ◽  
H Khodzhibagiyan ◽  
V Marusov ◽  
...  
Keyword(s):  
Superconducting Magnets ◽  
Cryogenic Testing

Cryogenic testing of microphones and preamplifiers for MEMS quench detection in superconducting magnets

2021 ◽  
Vol 150 (4) ◽  
pp. A95-A95
Author(s):  
Reid Baris ◽  
Mischael Anilus ◽  
Zijia Zhao ◽  
Steve Chau ◽  
Wayne Liu ◽  
...  
Keyword(s):  
Superconducting Magnets ◽  
Cryogenic Testing

Solid-phase immunoelectron microscopy for rapid diagnosis of enteroviruses

1984 ◽  
Vol 42 ◽  
pp. 226-227 ◽  
Author(s):  
K. Pegg-Feige ◽  
F. W. Doane
Keyword(s):  
Electron Microscopy ◽  
Cell Culture ◽  
Immunoelectron Microscopy ◽  
Detection Method ◽  
Solid Phase ◽  
Protein A ◽  
Plant Viruses ◽  
Rapid Diagnosis ◽  
Virus Diagnosis ◽  
Antiviral Antibody

Immunoelectron microscopy (IEM) applied to rapid virus diagnosis offers a more sensitive detection method than direct electron microscopy (DEM), and can also be used to serotype viruses. One of several IEM techniques is that introduced by Derrick in 1972, in which antiviral antibody is attached to the support film of an EM specimen grid. Originally developed for plant viruses, it has recently been applied to several animal viruses, especially rotaviruses. We have investigated the use of this solid phase IEM technique (SPIEM) in detecting and identifying enteroviruses (in the form of crude cell culture isolates), and have compared it with a modified “SPIEM-SPA” method in which grids are coated with protein A from Staphylococcus aureus prior to exposure to antiserum.

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