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Title: Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade

The superconducting magnet system in Hall B being designed and built as part of the Jefferson Lab 12 GeV upgrade requires powering two conduction cooled superconducting magnets - a torus and a solenoid. The torus magnet is designed to operate at 3770 A and solenoid at 2416 A. Failure Modes and Effects Analysis (FMEA) determined that voltage level thresholds and dump switch operation for magnet protection should be tested and analyzed before incorporation into the system. The designs of the quench protection and voltage tap sub-systems were driven by the requirement to use a primary hard-wired quench detection sub-system together with a secondary PLC-based protection. Parallel path voltage taps feed both the primary and secondary quench protection sub-systems. The PLC based secondary protection is deployed as a backup for the hard-wired quench detection sub-system and also acts directly on the dump switch. Here, we describe a series of tests and modifications carried out on the magnet power supply and quench protection system to ensure that the superconducting magnet is protected for all fault scenarios.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Report Number(s):
JLAB-ACE-17-2458; DOE/OR/23177-4131
Journal ID: ISSN 1051-8223; TRN: US1703025
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; detection; dump switch; magnet; magnet protection; power supply; quench; superconductivity
OSTI Identifier:
1402683

Ghoshal, Probir K., Bachimanchi, Ramakrishna, Fair, Ruben J., Gelhaar, David, Kumar, Onish, Philip, Sarin, and Todd, Mark A.. Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade. United States: N. p., Web. doi:10.1109/TASC.2017.2759280.
Ghoshal, Probir K., Bachimanchi, Ramakrishna, Fair, Ruben J., Gelhaar, David, Kumar, Onish, Philip, Sarin, & Todd, Mark A.. Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade. United States. doi:10.1109/TASC.2017.2759280.
Ghoshal, Probir K., Bachimanchi, Ramakrishna, Fair, Ruben J., Gelhaar, David, Kumar, Onish, Philip, Sarin, and Todd, Mark A.. 2017. "Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade". United States. doi:10.1109/TASC.2017.2759280. https://www.osti.gov/servlets/purl/1402683.
@article{osti_1402683,
title = {Superconducting Magnet Power Supply and Hard-Wired Quench Protection at Jefferson Lab for 12 GeV Upgrade},
author = {Ghoshal, Probir K. and Bachimanchi, Ramakrishna and Fair, Ruben J. and Gelhaar, David and Kumar, Onish and Philip, Sarin and Todd, Mark A.},
abstractNote = {The superconducting magnet system in Hall B being designed and built as part of the Jefferson Lab 12 GeV upgrade requires powering two conduction cooled superconducting magnets - a torus and a solenoid. The torus magnet is designed to operate at 3770 A and solenoid at 2416 A. Failure Modes and Effects Analysis (FMEA) determined that voltage level thresholds and dump switch operation for magnet protection should be tested and analyzed before incorporation into the system. The designs of the quench protection and voltage tap sub-systems were driven by the requirement to use a primary hard-wired quench detection sub-system together with a secondary PLC-based protection. Parallel path voltage taps feed both the primary and secondary quench protection sub-systems. The PLC based secondary protection is deployed as a backup for the hard-wired quench detection sub-system and also acts directly on the dump switch. Here, we describe a series of tests and modifications carried out on the magnet power supply and quench protection system to ensure that the superconducting magnet is protected for all fault scenarios.},
doi = {10.1109/TASC.2017.2759280},
journal = {IEEE Transactions on Applied Superconductivity},
number = 8,
volume = 27,
place = {United States},
year = {2017},
month = {10}
}