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Title: 2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region

Abstract

A new tangential two-dimensional soft x-ray imaging system (SXRIS) is being designed to examine the edge island structure in the lower X-point region of DIII-D. Plasma shielding and/or amplification of the calculated vacuum islands may play a role in the suppression of edge-localized modes via resonant magnetic perturbations (RMPs). The SXRIS is intended to improve the understanding of three-dimensional (3D) phenomena associated with RMPs. This system utilizes a tangential view with a pinhole imaging system and spectral filtering with beryllium foils. SXR emission is chosen to avoid line radiation and allows suitable signal at the top of a H-mode pedestal where T{sub e}{approx}1-2 keV. A synthetic diagnostic calculation based on 3D SXR emissivity estimates is used to help assess signal levels and resolution of the design. A signal-to-noise ratio of 10 at 1 cm resolution is expected for the perturbed signals, which are sufficient to resolve most of the predicted vacuum island sizes.

Authors:
; ; ; ;  [1];  [2]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
Publication Date:
OSTI Identifier:
22058742
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 81; Journal Issue: 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BERYLLIUM; DESIGN; DISTURBANCES; DOUBLET-3 DEVICE; EDGE LOCALIZED MODES; EMISSIVITY; H-MODE PLASMA CONFINEMENT; PLASMA; SHIELDING; SIGNAL-TO-NOISE RATIO; SOFT X RADIATION; THREE-DIMENSIONAL CALCULATIONS; TOPOLOGY; X-RAY EMISSION ANALYSIS

Citation Formats

Shafer, M W, Battaglia, D J, Unterberg, E A, Hillis, D L, Maingi, R, and Evans, T E. 2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region. United States: N. p., 2010. Web. doi:10.1063/1.3481166.
Shafer, M W, Battaglia, D J, Unterberg, E A, Hillis, D L, Maingi, R, & Evans, T E. 2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region. United States. https://doi.org/10.1063/1.3481166
Shafer, M W, Battaglia, D J, Unterberg, E A, Hillis, D L, Maingi, R, and Evans, T E. 2010. "2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region". United States. https://doi.org/10.1063/1.3481166.
@article{osti_22058742,
title = {2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region},
author = {Shafer, M W and Battaglia, D J and Unterberg, E A and Hillis, D L and Maingi, R and Evans, T E},
abstractNote = {A new tangential two-dimensional soft x-ray imaging system (SXRIS) is being designed to examine the edge island structure in the lower X-point region of DIII-D. Plasma shielding and/or amplification of the calculated vacuum islands may play a role in the suppression of edge-localized modes via resonant magnetic perturbations (RMPs). The SXRIS is intended to improve the understanding of three-dimensional (3D) phenomena associated with RMPs. This system utilizes a tangential view with a pinhole imaging system and spectral filtering with beryllium foils. SXR emission is chosen to avoid line radiation and allows suitable signal at the top of a H-mode pedestal where T{sub e}{approx}1-2 keV. A synthetic diagnostic calculation based on 3D SXR emissivity estimates is used to help assess signal levels and resolution of the design. A signal-to-noise ratio of 10 at 1 cm resolution is expected for the perturbed signals, which are sufficient to resolve most of the predicted vacuum island sizes.},
doi = {10.1063/1.3481166},
url = {https://www.osti.gov/biblio/22058742}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 81,
place = {United States},
year = {Fri Oct 15 00:00:00 EDT 2010},
month = {Fri Oct 15 00:00:00 EDT 2010}
}