Test Results of Fast Decaying Current-Induced AC Losses in SHMS Superconducting Magnets at Jefferson Lab
Abstract
The 11 GeV Super High Momentum Spectrometer (SHMS) of Hall C, part of the recent 12 GeV accelerator Upgrade at Jefferson Lab, was successfully commissioned in 2017. Fast current discharges of the SHMS Q2, Q3 quadrupoles and dipole superconducting magnets experienced some level of operational difficulty, during commissioning and normal operation. Measurements and analyses demonstrate that the fast current discharge leads to substantial AC losses in the conductor and subsequently triggers a quench-back effect. The details of the measurements and analyses have been reported previously. This paper focuses on the test results of the magnets using a reduced value of the protection dump resistor for each magnet to lower the current decay rate. Finally, the test results confirmed that the reduced dump resistances eliminated the quench-back effect for the SHMS Q2, Q3 and Dipole magnets, thus improving their cryogenic operability.
- Authors:
-
[1];
[1];
[1];
[1]
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1618828
- Report Number(s):
- JLAB-PHY-19-3055; DOE/OR/23177-4773
Journal ID: ISSN 1051-8223; TRN: US2106825
- Grant/Contract Number:
- AC05-06OR23177
- Resource Type:
- Accepted Manuscript
- Journal Name:
- IEEE Transactions on Applied Superconductivity
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 4; Journal ID: ISSN 1051-8223
- Publisher:
- IEEE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; quench-back; AC loss; eddy currents; fast discharge; superconducting magnets
Citation Formats
Sun, Eric, Lassiter, Steven, Ghoshal, Probir, Fair, Ruben, and Brindza, Paul. Test Results of Fast Decaying Current-Induced AC Losses in SHMS Superconducting Magnets at Jefferson Lab. United States: N. p., 2020.
Web. doi:10.1109/TASC.2020.2974850.
Sun, Eric, Lassiter, Steven, Ghoshal, Probir, Fair, Ruben, & Brindza, Paul. Test Results of Fast Decaying Current-Induced AC Losses in SHMS Superconducting Magnets at Jefferson Lab. United States. https://doi.org/10.1109/TASC.2020.2974850
Sun, Eric, Lassiter, Steven, Ghoshal, Probir, Fair, Ruben, and Brindza, Paul. Tue .
"Test Results of Fast Decaying Current-Induced AC Losses in SHMS Superconducting Magnets at Jefferson Lab". United States. https://doi.org/10.1109/TASC.2020.2974850. https://www.osti.gov/servlets/purl/1618828.
@article{osti_1618828,
title = {Test Results of Fast Decaying Current-Induced AC Losses in SHMS Superconducting Magnets at Jefferson Lab},
author = {Sun, Eric and Lassiter, Steven and Ghoshal, Probir and Fair, Ruben and Brindza, Paul},
abstractNote = {The 11 GeV Super High Momentum Spectrometer (SHMS) of Hall C, part of the recent 12 GeV accelerator Upgrade at Jefferson Lab, was successfully commissioned in 2017. Fast current discharges of the SHMS Q2, Q3 quadrupoles and dipole superconducting magnets experienced some level of operational difficulty, during commissioning and normal operation. Measurements and analyses demonstrate that the fast current discharge leads to substantial AC losses in the conductor and subsequently triggers a quench-back effect. The details of the measurements and analyses have been reported previously. This paper focuses on the test results of the magnets using a reduced value of the protection dump resistor for each magnet to lower the current decay rate. Finally, the test results confirmed that the reduced dump resistances eliminated the quench-back effect for the SHMS Q2, Q3 and Dipole magnets, thus improving their cryogenic operability.},
doi = {10.1109/TASC.2020.2974850},
journal = {IEEE Transactions on Applied Superconductivity},
number = 4,
volume = 30,
place = {United States},
year = {2020},
month = {2}
}
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