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Title: The Stress Analysis of PF1A Lower Terminals, Leads, and Bus Bars for NSTX-U

Abstract

Both PF1A upper coils and lower coils experienced difficult situations during the National Spherical Torus Experiment–Upgrade (NSTX-U) machine operations in 2016. There are huge up-down electromagnetic forces on PF1A terminals, coil leads, and bus bars. Therefore, further analysis and additional reinforcement supports are needed to reduce the stress on the coil terminals and leads. Structural, thermal, and electromagnetic analyses of the three-dimensional PF1A lower bus bar and coil lead model have been performed using imported electromagnetic loads with the worst cases of 96 scenarios through the global Biot-Savart stick model. The reinforcement blocks for the PF1A lower coil leads and flags and two clamps were analyzed and installed for field testing. Finally, the coil leads and bus bars used in the field testing were qualified for the normal NSTX-U operating loads allowing similar reinforcement details to be used in the real NSTX-U machine.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1543442
Grant/Contract Number:  
[AC02-09CH11466]
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
[Journal Name: Fusion Science and Technology]; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Poiloidal field magnet; coil lead; bus bar; stress analysis

Citation Formats

Fang, Jiarong, Titus, Peter, Cai, Dang, and Zhang, Han. The Stress Analysis of PF1A Lower Terminals, Leads, and Bus Bars for NSTX-U. United States: N. p., 2019. Web. doi:10.1080/15361055.2019.1622972.
Fang, Jiarong, Titus, Peter, Cai, Dang, & Zhang, Han. The Stress Analysis of PF1A Lower Terminals, Leads, and Bus Bars for NSTX-U. United States. doi:10.1080/15361055.2019.1622972.
Fang, Jiarong, Titus, Peter, Cai, Dang, and Zhang, Han. Thu . "The Stress Analysis of PF1A Lower Terminals, Leads, and Bus Bars for NSTX-U". United States. doi:10.1080/15361055.2019.1622972.
@article{osti_1543442,
title = {The Stress Analysis of PF1A Lower Terminals, Leads, and Bus Bars for NSTX-U},
author = {Fang, Jiarong and Titus, Peter and Cai, Dang and Zhang, Han},
abstractNote = {Both PF1A upper coils and lower coils experienced difficult situations during the National Spherical Torus Experiment–Upgrade (NSTX-U) machine operations in 2016. There are huge up-down electromagnetic forces on PF1A terminals, coil leads, and bus bars. Therefore, further analysis and additional reinforcement supports are needed to reduce the stress on the coil terminals and leads. Structural, thermal, and electromagnetic analyses of the three-dimensional PF1A lower bus bar and coil lead model have been performed using imported electromagnetic loads with the worst cases of 96 scenarios through the global Biot-Savart stick model. The reinforcement blocks for the PF1A lower coil leads and flags and two clamps were analyzed and installed for field testing. Finally, the coil leads and bus bars used in the field testing were qualified for the normal NSTX-U operating loads allowing similar reinforcement details to be used in the real NSTX-U machine.},
doi = {10.1080/15361055.2019.1622972},
journal = {Fusion Science and Technology},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

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Works referenced in this record:

Forensic Analysis of Faulted NSTX-U Inner Poloidal Field Coil
journal, July 2018

  • Petrella, Joseph R.; Zatz, Irving J.; Gerhardt, Stefan
  • IEEE Transactions on Plasma Science, Vol. 46, Issue 7
  • DOI: 10.1109/TPS.2018.2831919