skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The ITER 3D Magnetic Diagnostic Response to Applied n=3 and n=4 RMP's

Abstract

The ITER magnetic diagnostic response to applied n=3 and n=4 RMPs has been calculated for the 15MA scenario. The VMEC code was utilized to calculate free boundary 3D ideal MHD equilibria, where the non-stellarator symmetric terms were included in the calculation. This allows an assessment to be made of the possible boundary displacements due to RMP application in ITER. As the VMEC code assumes a continuous set of nested flux surface, the possibility of island and stochastic region formation is ignored. At the start of the current at-top (L-Mode) application of n = 4 RMP's indicates approximately 1 cm peak-to-peak displacements on the low field side of the plasma while later in the shot (H-mode) perturbations as large as 3 cm are present. Forward modeling of the ITER magnetic diagnostics indicates significant non-axisymmetric plasma response, exceeding 10% the axisymmetric signal in many of the flux loops. Magnetic field probes seem to indicate a greater robustness to 3D effects but still indicate large sensitivities to 3D effects in a number of sensors. Forward modeling of the diagnostics response to 3D equilibria allows assessment of diagnostics design and control scenarios.

Authors:
 [1]
  1. PPPL
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1172626
Report Number(s):
PPPL-5037
Journal ID: ISSN 0741-3335
DOE Contract Number:
DE-AC02-09CH11466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics and Controlled Fusion; Journal Volume: 56; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Diagnostics; Equilibrium, MHD- Toroidal; magnetics

Citation Formats

Lazerson, S A. The ITER 3D Magnetic Diagnostic Response to Applied n=3 and n=4 RMP's. United States: N. p., 2014. Web. doi:10.1088/0741-3335/56/9/095006.
Lazerson, S A. The ITER 3D Magnetic Diagnostic Response to Applied n=3 and n=4 RMP's. United States. doi:10.1088/0741-3335/56/9/095006.
Lazerson, S A. Mon . "The ITER 3D Magnetic Diagnostic Response to Applied n=3 and n=4 RMP's". United States. doi:10.1088/0741-3335/56/9/095006. https://www.osti.gov/servlets/purl/1172626.
@article{osti_1172626,
title = {The ITER 3D Magnetic Diagnostic Response to Applied n=3 and n=4 RMP's},
author = {Lazerson, S A},
abstractNote = {The ITER magnetic diagnostic response to applied n=3 and n=4 RMPs has been calculated for the 15MA scenario. The VMEC code was utilized to calculate free boundary 3D ideal MHD equilibria, where the non-stellarator symmetric terms were included in the calculation. This allows an assessment to be made of the possible boundary displacements due to RMP application in ITER. As the VMEC code assumes a continuous set of nested flux surface, the possibility of island and stochastic region formation is ignored. At the start of the current at-top (L-Mode) application of n = 4 RMP's indicates approximately 1 cm peak-to-peak displacements on the low field side of the plasma while later in the shot (H-mode) perturbations as large as 3 cm are present. Forward modeling of the ITER magnetic diagnostics indicates significant non-axisymmetric plasma response, exceeding 10% the axisymmetric signal in many of the flux loops. Magnetic field probes seem to indicate a greater robustness to 3D effects but still indicate large sensitivities to 3D effects in a number of sensors. Forward modeling of the diagnostics response to 3D equilibria allows assessment of diagnostics design and control scenarios.},
doi = {10.1088/0741-3335/56/9/095006},
journal = {Plasma Physics and Controlled Fusion},
number = 9,
volume = 56,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}