High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Ox coil
Abstract
Here, small insert coils have been built using a multifilamentary Bi2Sr2CaCu2Ox round wire, and characterized in background fields to explore the quench behaviors and limits of Bi2Sr2CaCu2Ox superconducting magnets, with an emphasis on assessing the impact of slow normal zone propagation on quench detection. Using heaters of various lengths to initiate a small normal zone, a coil was quenched safely more than 70 times without degradation, with the maximum coil temperature reaching 280 K. Coils withstood a resistive voltage of tens of mV for seconds without quenching, showing the high stability of these coils and suggesting that the quench detection voltage shall be greater than 50 mV to not to falsely trigger protection. The hot spot temperature for the resistive voltage of the normal zone to reach 100 mV increases from ~40 K to ~80 K with increasing the operating wire current density Jo from 89 A/mm-2 to 354 A/mm-2 whereas for the voltage to reach 1 V, it increases from ~60 K to ~140 K, showing the increasing negative impact of slow normal zone propagation on quench detection with increasing Jo and the need to limit the quench detection voltage to < 1 V. These measurements, coupled with anmore »
- Authors:
-
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1339972
- Alternate Identifier(s):
- OSTI ID: 1238900
- Report Number(s):
- FERMILAB-PUB-15-023-TD
Journal ID: ISSN 0953-2048; 1509984
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Superconductor Science and Technology
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 7; Journal ID: ISSN 0953-2048
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; Bi-2212 magnet; quench detection; quench protection; quench behavior; superconducting magnets
Citation Formats
Shen, Tengming, Ye, Liyang, North Carolina State Univ., Raleigh, NC, Turrioni, Daniele, and Li, Pei. High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Ox coil. United States: N. p., 2015.
Web. doi:10.1088/0953-2048/28/7/075014.
Shen, Tengming, Ye, Liyang, North Carolina State Univ., Raleigh, NC, Turrioni, Daniele, & Li, Pei. High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Ox coil. United States. https://doi.org/10.1088/0953-2048/28/7/075014
Shen, Tengming, Ye, Liyang, North Carolina State Univ., Raleigh, NC, Turrioni, Daniele, and Li, Pei. 2015.
"High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Ox coil". United States. https://doi.org/10.1088/0953-2048/28/7/075014. https://www.osti.gov/servlets/purl/1339972.
@article{osti_1339972,
title = {High-field quench behavior and dependence of hot spot temperature on quench detection voltage threshold in a Bi2Sr2CaCu2Ox coil},
author = {Shen, Tengming and Ye, Liyang and North Carolina State Univ., Raleigh, NC and Turrioni, Daniele and Li, Pei},
abstractNote = {Here, small insert coils have been built using a multifilamentary Bi2Sr2CaCu2Ox round wire, and characterized in background fields to explore the quench behaviors and limits of Bi2Sr2CaCu2Ox superconducting magnets, with an emphasis on assessing the impact of slow normal zone propagation on quench detection. Using heaters of various lengths to initiate a small normal zone, a coil was quenched safely more than 70 times without degradation, with the maximum coil temperature reaching 280 K. Coils withstood a resistive voltage of tens of mV for seconds without quenching, showing the high stability of these coils and suggesting that the quench detection voltage shall be greater than 50 mV to not to falsely trigger protection. The hot spot temperature for the resistive voltage of the normal zone to reach 100 mV increases from ~40 K to ~80 K with increasing the operating wire current density Jo from 89 A/mm-2 to 354 A/mm-2 whereas for the voltage to reach 1 V, it increases from ~60 K to ~140 K, showing the increasing negative impact of slow normal zone propagation on quench detection with increasing Jo and the need to limit the quench detection voltage to < 1 V. These measurements, coupled with an analytical quench model, were used to access the impact of the maximum allowable voltage and temperature upon quench detection on the quench protection, assuming to limit the hot spot temperature to <300 K.},
doi = {10.1088/0953-2048/28/7/075014},
url = {https://www.osti.gov/biblio/1339972},
journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 7,
volume = 28,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
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