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Title: Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U

Abstract

Adding toroidal arrays of magnetic probes at the top and bottom of NSTX-U would improve both the detection of the multimodal plasma response to applied magnetic perturbations and the identification of the poloidal structure of unstable plasma modes, as well as contribute to the validation of MHD models, improve the understanding of the plasma response to external fields, and improve the error field correction. In this paper, the linear MHD code MARS-F/K has been used to identify poloidal locations that would improve the capability to measure stationary or near-stationary 3D fields that may result from the plasma response to external sources of non-axisymmetric fields. The study highlighted 6 poloidal positions where new arrays of both poloidal and radial magnetic field sensors would improve the poloidal resolution. Here, the proposed set of new arrays combined with the present ones is shown to be capable of measuring the poloidal structure of perturbations with n ≤ 6 and of detecting the multimodal plasma response. Assessment of the trade-off in the poloidal length of the probes leads to an ideal length between 10 cm and 30 cm. A method to configure the probes of a toroidal array based on the singular value decomposition conditionmore » number is proposed, and an ideal solution and a low-cost one are presented.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [3]
+ Show Author Affiliations
  1. General Atomics, San Diego, CA (United States)
  2. General Atomics, San Diego, CA (United States); DOE, Office of Fusion Energy Sciences, Washington, DC (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609204
Alternate Identifier(s):
OSTI ID: 1461609
Grant/Contract Number:  
FC02-04ER54698; FG02-99ER54522; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; instruments & instrumentation; physics; magnetic field sensors; magnetohydrodynamics; plasma diagnostics

Citation Formats

Munaretto, S., Strait, E. J., Lanctot, M. J., and Wang, Z. R. Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U. United States: N. p., 2018. Web. doi:10.1063/1.5036942.
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Munaretto, S., Strait, E. J., Lanctot, M. J., & Wang, Z. R. Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U. United States. https://doi.org/10.1063/1.5036942
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Munaretto, S., Strait, E. J., Lanctot, M. J., and Wang, Z. R. Wed . "Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U". United States. https://doi.org/10.1063/1.5036942. https://www.osti.gov/servlets/purl/1609204.
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@article{osti_1609204,
title = {Conceptual design of extended magnetic probe set to improve 3D field detection in NSTX-U},
author = {Munaretto, S. and Strait, E. J. and Lanctot, M. J. and Wang, Z. R.},
abstractNote = {Adding toroidal arrays of magnetic probes at the top and bottom of NSTX-U would improve both the detection of the multimodal plasma response to applied magnetic perturbations and the identification of the poloidal structure of unstable plasma modes, as well as contribute to the validation of MHD models, improve the understanding of the plasma response to external fields, and improve the error field correction. In this paper, the linear MHD code MARS-F/K has been used to identify poloidal locations that would improve the capability to measure stationary or near-stationary 3D fields that may result from the plasma response to external sources of non-axisymmetric fields. The study highlighted 6 poloidal positions where new arrays of both poloidal and radial magnetic field sensors would improve the poloidal resolution. Here, the proposed set of new arrays combined with the present ones is shown to be capable of measuring the poloidal structure of perturbations with n ≤ 6 and of detecting the multimodal plasma response. Assessment of the trade-off in the poloidal length of the probes leads to an ideal length between 10 cm and 30 cm. A method to configure the probes of a toroidal array based on the singular value decomposition condition number is proposed, and an ideal solution and a low-cost one are presented.},
doi = {10.1063/1.5036942},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Wed Jul 25 00:00:00 EDT 2018},
month = {Wed Jul 25 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5036942
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Works referenced in this record:

Spatial and temporal analysis of DIII-D 3D magnetic diagnostic data
journal, August 2016

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Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
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journal, November 2014

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  • Review of Scientific Instruments, Vol. 85, Issue 11
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